Nostr notes by Bitcoin Optech

Bitcoin Optech newsletter #400 is here: - recaps the "Testing ...

2026-04-10T10:36:11Z

Bitcoin Optech newsletter #400 is here:

- recaps the "Testing Bitcoin Core 31.0 Release Candidates" PR Review Club meeting
- Optech Newsletter #400 Podcast
https://bitcoinops.org/en/newsletters/2026/04/10/

'Testing Bitcoin Core 31.0 Release Candidates' was a review club meeting that did not review a particular PR, but rather was a group testing effort. Before each major Bitcoin Core release, extensive testing by the community is considered essential. For this reason, a volunteer writes a testing guide for a release candidate so that as many people as possible can productively test without having to independently ascertain what’s new or changed in the release, and reinvent the various setup steps to test these features or changes...
https://bitcoinops.org/en/newsletters/2026/04/10/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.

Bitcoin Optech newsletter #398 is here: - summarizes popular ...

2026-03-27T10:05:08Z

Bitcoin Optech newsletter #398 is here:

- summarizes popular Q&A from Stack Exchange
- Bitcoin Core 28.4, Core Lightning 26.04rc1
- Optech Newsletter #398 Podcast
https://bitcoinops.org/en/newsletters/2026/03/27/

Selected Q&A from Bitcoin Stack Exchange
- What is meant by “Bitcoin doesn’t use encryption”?
- When and why did Bitcoin Script shift to a commit–reveal structure?
- Does P2TR-MS (Taproot M-of-N multisig) leak public keys?
- Does OP_CHECKSIGFROMSTACK intentionally allow cross-UTXO signature reuse?
https://bitcoinops.org/en/newsletters/2026/03/27/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.

Bitcoin Optech newsletter #395 is here: - describes a standard ...

2026-03-06T14:16:32Z

Bitcoin Optech newsletter #395 is here:

- describes a standard for verifying VTXOs across different Ark implementations
- links to a draft BIP for expanding the miner-usable nonce space in the block header’s nVersion field
- points to extensions to standard tooling for TEMPLATEHASH-CSFS-IK support
- summarizes updates to the Hourglass V2 proposal
- examines perspectives on cryptographic algorithm agility for Bitcoin
- Optech Newsletter #395 Podcast
https://bitcoinops.org/en/newsletters/2026/03/06/

Jgmcalpine posted to Delving Bitcoin about his proposal for V-PACK, a stateless VTXO verification standard, which aims to provide a mechanism to independently verify and visualize VTXOs in the Ark ecosystem...
https://bitcoinops.org/en/newsletters/2026/03/06/#a-standard-for-stateless-vtxo-verification

Matt Corallo posted to the Bitcoin-Dev mailing list a draft BIP to increase the number of bits available in nVersion’s nonce space for miners from 16 to 24...
https://bitcoinops.org/en/newsletters/2026/03/06/#draft-bip-for-expanded-nversion-nonce-space-for-miners

Antoine Poinsot wrote on the Bitcoin-Dev mailing list about his preliminary work to integrate the taproot-native OP_TEMPLATEHASH soft fork proposal into miniscript and PSBTs...
https://bitcoinops.org/en/newsletters/2026/03/06/#extensions-to-standard-tooling-for-templatehash-csfs-ik-support

Mike Casey posted an update to the Bitcoin-Dev mailing list for the Hourglass protocol to mitigate the market impact of quantum attacks against certain lost coins...
https://bitcoinops.org/en/newsletters/2026/03/06/#hourglass-v2-update

Ethan Heilman wrote on the Bitcoin-Dev mailing list regarding the potential need for RFC7696 Cryptographic Algorithm Agility in Bitcoin...
https://bitcoinops.org/en/newsletters/2026/03/06/#algorithm-agility-for-bitcoin

Pieter Wuille wrote to the Bitcoin-Dev mailing list about the limitations of the cryptographic agility...
https://bitcoinops.org/en/newsletters/2026/03/06/#the-limitations-of-cryptographic-agility-in-bitcoin

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 17:30 UTC.

Anthony Towns and Mikhail Kudinov joined Optech to discuss ...

2026-01-06T22:36:08Z

Anthony Towns and Mikhail Kudinov joined Optech to discuss Newsletter #386:

- A notice about the wallet migration bug in Bitcoin Core
- Building a vault using blinded co-signers
- BIP for Peer feature negotiation
- Year 2106 timestamp overflow
- BIP54 timestamp restriction for a timestamp overflow soft fork
- Mitigating a CTV footgun
- CTV activation meeting
- OP_CHECKCONSOLIDATION to enable cheaper consolidations
- Hash-based signatures post-quantum Bitcoin
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/01/06/

Fountain:
https://fountain.fm/episode/LSYvA10Nd4ToHfmuKhvX

Spotify:
https://open.spotify.com/episode/21GFU6WOODEv2s9F2NvBtB

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-386-recap/id1674626983?i=1000744026375

Bitcoin Optech newsletter #385: 2025 Year-in-Review Special is ...

2025-12-19T15:30:32Z

Bitcoin Optech newsletter #385: 2025 Year-in-Review Special is here:

- notes Bitcoin developments during each month of 2025
- feature: Vulnerability disclosures
- feature: Quantum
- feature: Soft fork proposals
- feature: Stratum v2
- feature: Major releases of popular infrastructure projects
- feature: Optech
https://bitcoinops.org/en/newsletters/2025/12/19/

In 2025, Optech summarized more than a dozen vulnerability disclosures...
https://bitcoinops.org/en/newsletters/2025/12/19/#vulns

With the increased attention on the potential for a future quantum computer to weaken or break the Elliptic Curve Discrete Logarithm (ECDL) hardness assumption that Bitcoin relies on to prove the ownership of coins, several conversations and proposals were put forward throughout the year to discuss and mitigate the impact of such a development.
https://bitcoinops.org/en/newsletters/2025/12/19/#quantum

This year saw a bevy of discussions around soft fork proposals, ranging from the tightly scoped and minimally impactful, to the broadly scoped and powerful…
https://bitcoinops.org/en/newsletters/2025/12/19/#softforks

Stratum v2 is a mining protocol designed to replace the original Stratum protocol used between miners and mining pools. Throughout 2025, Bitcoin Core received several updates to better support Stratum v2 implementations....
https://bitcoinops.org/en/newsletters/2025/12/19/#stratumv2

Optech covered major releases of popular infrastructure projects throughout the year...
https://bitcoinops.org/en/newsletters/2025/12/19/#releases

In Optech’s eighth year, we published:

- 50 newsletters
- over 80,000 words, a 225pg book equivalent
- over 60hrs of podcasts, with 500,000 words of transcripts w/75 guests
- 150+ non-English translations
https://bitcoinops.org/en/newsletters/2025/12/19/#optech

A special thank you
After contributing as the primary author for 376 consecutive Bitcoin Optech newsletters, Dave Harding stepped back from contributing regularly this year. We cannot thank Harding enough for anchoring the newsletter for eight years and all of the Bitcoin education, elucidation, and understanding he brought the community. We are eternally grateful and wish him all the best.

Bitcoin Optech will host an audio recap discussion of this special newsletter on Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #383 is here: - describes a fixed ...

2025-12-05T13:02:31Z

Bitcoin Optech newsletter #383 is here:

- describes a fixed vulnerability affecting the NBitcoin library
- summarizes the LNHANCE soft fork proposal
- relays a call to action to benchmark Bitcoin script execution under GSR's varops budget
- highlights discussion of optimizations to SLH-DSA (SPHINCS) post-quantum signatures
- Optech Newsletter #383 Podcast
https://bitcoinops.org/en/newsletters/2025/12/05/

Bruno Garcia posted to Delving Bitcoin about a theoretical consensus failure in NBitcoin that could occur when using OP_NIP...
https://bitcoinops.org/en/newsletters/2025/12/05/#consensus-bug-in-nbitcoin-library

Moonsettler proposes a soft fork for LNHANCE now that all four of its constituent opcodes have updated BIPs and reference implementations...
https://bitcoinops.org/en/newsletters/2025/12/05/#lnhance-soft-fork

Julian posted a call to action to benchmark Bitcoin script execution under the varops budget...
https://bitcoinops.org/en/newsletters/2025/12/05/#benchmarking-the-varops-budget

Continuing the discussions around hardening Bitcoin against quantum computing, conduition presented his work on optimizing the SPHINCS signing algorithm...
https://bitcoinops.org/en/newsletters/2025/12/05/#slh-dsa-sphincs-post-quantum-signature-optimizations

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter ...

2025-11-04T19:46:00Z

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #378:

- Disclosure of four low-severity vulnerabilities in Bitcoin Core
- Q&A from Bitcoin Stack Exchange including questions on datacarriersize, OP_TEMPLATEHASH and others
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/11/04/

Fountain:
https://fountain.fm/episode/52iLDnzzU5I7rxb8coJT

Spotify:
https://open.spotify.com/episode/3gvj03rHM7qT0jTnQcMnfH

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-378-recap/id1674626983?i=1000735256317

Francesco Madonna and supertestnet joined Optech to discuss ...

2025-10-28T19:38:38Z

Francesco Madonna and supertestnet joined Optech to discuss Newsletter #376:

- Continued discussion of block template sharing
- B-SSL a Secure Bitcoin Signing Layer
- Bitcoin Core 30.0
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/21/

Fountain:
https://fountain.fm/episode/uYvjTVDINCV7N95sriNu

Spotify:
https://open.spotify.com/episode/2aZv1l0GhSlUSoerkK0rgs

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-376-recap/id1674626983?i=1000733913844

Sindura Saraswathi, ZmnSCPxj and Eugene Siegel joined Optech to ...

2025-10-17T14:25:56Z

Sindura Saraswathi, ZmnSCPxj and Eugene Siegel joined Optech to discuss Newsletter #375:

- Optimal Threshold Signatures
- Flattening certain nested threshold signatures
- Theoretical limitations on embedding data in the UTXO set
- The ‘Compact block harness’ Bitcoin Core PR Review Club
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/14/

Fountain:
https://fountain.fm/episode/chMU3zQSD9f2tyCuzW4P

Spotify:
https://open.spotify.com/episode/2PykH77AZa2zugekSKsTPb

Bitcoin Optech newsletter #376 is here: - shares an update on the ...

2025-10-17T11:26:28Z

Bitcoin Optech newsletter #376 is here:

- shares an update on the proposal for nodes to share their current block template
- summarizes a paper outlining a covenant-less vault construction
- Bitcoin Core 30.0 release
- Optech Newsletter #376 Podcast
https://bitcoinops.org/en/newsletters/2025/10/17/

Discussion continued around the proposal for full node peers to occasionally send each other their current template for the next block using compact block relay encoding...
https://bitcoinops.org/en/newsletters/2025/10/17/#continued-discussion-of-block-template-sharing

Francesco Madonna posted to Delving Bitcoin about a concept which is a covenant-less vault model using taproot, OP_CHECKSEQUENCEVERIFY, and OP_CHECKLOCKTIMEVERIFY...
https://bitcoinops.org/en/newsletters/2025/10/17/#b-ssl-a-secure-bitcoin-signing-layer

Bitcoin Core 30.0 is the latest version release of the network’s predominant full node. Its release notes describe several significant improvements...
https://bitcoinops.org/en/newsletters/2025/10/17/#bitcoin-core-30-0

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #375 is here: - describes research into ...

2025-10-10T13:49:38Z

Bitcoin Optech newsletter #375 is here:

- describes research into tradeoffs between usability and security in threshold signatures
- summarizes an approach to convert nested threshold signatures into a single-layer signing group
- examines the extent to which data could be embedded in the UTXO set under a restrictive set of rules
- recaps the "Compact block harness" PR Review Meeting
- Optech Newsletter #375 Podcast
https://bitcoinops.org/en/newsletters/2025/10/10/

Sindura Saraswathi posted research, co-authored by her and Korok Ray, to Delving Bitcoin about determining the optimal threshold for a multisignature scheme...
https://bitcoinops.org/en/newsletters/2025/10/10/#optimal-threshold-signatures

ZmnSCPxj posted to Delving Bitcoin to describe how to avoid using nested schnorr signatures in some cases that have not been proven safe...
https://bitcoinops.org/en/newsletters/2025/10/10/#flattening-certain-nested-threshold-signatures

Adam “Waxwing” Gibson started a discussion on the mailing list about the extent to which data could be embedded in the UTXO set under a restrictive set of rules for Bitcoin transactions...
https://bitcoinops.org/en/newsletters/2025/10/10/#theoretical-limitations-on-embedding-data-in-the-utxo-set

'Compact block harness' is a PR by Crypt-iQ that increases the fuzz test coverage by adding a test harness for the compact block relay logic...
https://bitcoinops.org/en/newsletters/2025/10/10/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Mark “Murch” Erhardt and Mike Schmidt are joined by Gustavo ...

2025-10-07T18:48:28Z

Mark “Murch” Erhardt and Mike Schmidt are joined by Gustavo Flores Echaiz to discuss Newsletter #374:

- The script restoration BIPs
- A BDK Wallet release and release candidates from Bitcoin Core and LND
- Our weekly notable code segment

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/07/

Fountain:
https://fountain.fm/episode/bN5DD679k2z2NLqaNvHQ

Spotify:
https://open.spotify.com/episode/2Fpd2NSKSAFydTy02y9cUv

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-374-recap/id1674626983?i=1000730656614

Matt Morehouse, Daniela Brozzoni, and Gustavo Flores Echaiz ...

2025-10-01T17:36:28Z

Matt Morehouse, Daniela Brozzoni, and Gustavo Flores Echaiz joined Optech to discuss Newsletter #373:

- Eclair vulnerability
- Research into feerate settings
- 12 Bitcoin Stack Exchange questions with an OP_RETURN focus
- Bitcoin Core 30.1 release candidate and testing guide
- And more

You can listen on our website: https://bitcoinops.org/en/podcast/2025/09/30/

Fountain: https://fountain.fm/episode/HUKeJE4y8iPGSD9WL4VS

Spotify: https://open.spotify.com/episode/55tV1tepMDPFtcONy8kHQI

Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-373-recap/id1674626983?i=1000729551630

ZmnSCPxj and Constantine Doumanidis joined Optech to discuss ...

2025-09-23T20:16:34Z

ZmnSCPxj and Constantine Doumanidis joined Optech to discuss Newsletter #372:

News
16:24 LSP-funded redundant overpayments
1:02 Partitioning and eclipse attacks using BGP interception

Changes to services and client software
13:49 Zero-knowledge proof of reserve tool
15:12 Alternative submarine swap protocol proof of concept

Releases and release candidates
39:14 Bitcoin Core 30.0rc1
1:16:28 BDK Chain 0.23.2

Notable code and documentation changes
1:17:19 Bitcoin Core #33268
1:18:56 Eclair #3157
1:19:52 LND #9975
1:20:21 LND #9677
1:20:41 LDK #4045
1:21:32 LDK #4049
1:22:18 BDK #1582
1:23:13 BDK #2000
1:24:17 BDK #2028

You can listen on our website: https://bitcoinops.org/en/podcast/2025/09/23/

Fountain: https://fountain.fm/episode/roAtQyqbkVOkZxNBz4z0

Spotify: https://open.spotify.com/episode/6lQx7XYXHK6o4u6iEjt1x6

Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-372-recap/id1674626983?i=1000728103838

Jonas Nick and Bastien Teinturier joined Optech to discuss ...

2025-09-16T19:13:54Z

Jonas Nick and Bastien Teinturier joined Optech to discuss Newsletter #371:

News
0:48 Provable Cryptography Workbook

Releases and release candidates
10:48 Bitcoin Core 29.1
11:17 Eclair v0.13.0
25:27 Bitcoin Core 30.0rc1

Notable code and documentation changes
33:18 Bitcoin Core #30469
33:18 Eclair #3163
40:27 Eclair #2308
45:18 Eclair #3021
48:08 Eclair #3142
50:30 LDK #4053
58:12 LDK #3886

You can listen on our website: https://bitcoinops.org/en/podcast/2025/09/16/

Fountain: https://fountain.fm/episode/FDSWN4dSOtzy7kezMw3G

Spotify: https://open.spotify.com/episode/240Htez9aCxIINL1rqCuWy

Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-371-recap/id1674626983?i=1000727098773

Bitcoin Optech newsletter #371 is here: - announces the ...

2025-09-12T12:16:13Z

Bitcoin Optech newsletter #371 is here:

- announces the availability of a workbook dedicated to provable cryptography
- Bitcoin Core 29.1, Eclair v0.13.0, Bitcoin Core 30.0rc1
- Optech Newsletter #371 Podcast

https://bitcoinops.org/en/newsletters/2025/09/12/

Jonas Nick posted to Delving Bitcoin to announce a short workbook he created for a four day event to “teach developers the basics of provable cryptography, […] consisting of cryptographic definitions, propositions, proofs and exercises.”
https://bitcoinops.org/en/newsletters/2025/09/12/#provable-cryptography-workbook

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Russell O’Connor, Olaoluwa Osuntokun, and Jeremy Rubin join ...

2025-09-10T10:51:15Z

Russell O’Connor, Olaoluwa Osuntokun, and Jeremy Rubin join Optech to discuss Newsletter #370:

Changing consensus
37:56 Details about the design of Simplicity
1:52 Draft BIP for adding elliptic curve operations to tapscript
19:23 Draft BIP for OP_TWEAKADD

Releases and release candidates
59:40 Core Lightning v25.09
1:00:24 Bitcoin Core 29.1rc2

Notable code and documentation changes
1:00:55 LDK #3726
1:02:24 LDK #4019
1:03:09 LND #9455
1:04:00 LND #10103
1:05:20 HWI #795

You can listen on our website: https://bitcoinops.org/en/podcast/2025/09/09/

Fountain: https://fountain.fm/episode/6IP69xVggsPJ4dZtShuf

Spotify: https://open.spotify.com/episode/1InhHmSFSrggcAxafzymWS

Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-370-recap/id1674626983?i=1000725872238

You can listen on our website: ...

2025-09-08T21:32:03Z

In reply to nevent1q…gt8r
_________________________

You can listen on our website: https://bitcoinops.org/en/podcast/2025/08/26/

Fountain: https://fountain.fm/episode/P5UDO600jU5Iva3fHFic

Spotify: https://open.spotify.com/episode/0ZPLyRlgDZvh2kN9WV95pF

Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-368-recap/id1674626983?i=1000725591869

Mark “Murch” Erhardt and Mike Schmidt discussed Newsletter ...

2025-09-08T21:28:22Z

Mark “Murch” Erhardt and Mike Schmidt discussed Newsletter #368:

News
0:30 Draft BIP for block template sharing
28:07 Trusted delegation of script evaluation

Changes to services and client software
33:07 ZEUS v0.11.3 released
33:25 Rust Utreexo resources
34:11 Peer-observer tooling and call to action
37:22 Bitcoin Core Kernel-based node announced
38:23 SimplicityHL released
39:17 LSP plugin for BTCPay Server
39:42 Proto mining hardware and software announced
40:46 Oracle resolution demo using CSFS
41:11 Relai adds taproot support

Releases and release candidates
43:09 LND v0.19.3-beta
43:29 Bitcoin Core 29.1rc1
43:55 Core Lightning v25.09rc2

Notable code and documentation changes
44:33 Bitcoin Core #32896
46:57 Bitcoin Core #33106
1:02:49 Core Lightning #8467
1:03:26 Core Lightning #8354
1:04:07 Eclair #3103
1:04:43 Eclair #3134
1:05:56 LDK #3897

Bitcoin Optech newsletter #370 is here: - details the design of ...

2025-09-05T11:35:35Z

Bitcoin Optech newsletter #370 is here:

- details the design of Simplicity
- links to a draft BIP for adding elliptic curve operations to tapscript
- describes the draft BIP for OP_TWEAKADD
- Optech Newsletter #370 Podcast
https://bitcoinops.org/en/newsletters/2025/09/05/

Russell O’Connor made three posts so far to Delving Bitcoin about “the philosophy and design of the Simplicity language”...
https://bitcoinops.org/en/newsletters/2025/09/05/#details-about-the-design-of-simplicity

Olaoluwa Osuntokun posted to the Bitcoin-Dev mailing list a link to a draft BIP for adding several opcodes to tapscript that will allow elliptic curve operations to be performed on the script evaluation stack...
https://bitcoinops.org/en/newsletters/2025/09/05/#draft-bip-for-adding-elliptic-curve-operations-to-tapscript

Jeremy Rubin posted to the Bitcoin-Dev mailing list a link a draft BIP to add OP_TWEAKADD to tapscript...
https://bitcoinops.org/en/newsletters/2025/09/05/#draft-bip-for-op-tweakadd

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bruno Garcia and Liam Eagen joined Optech to discuss Newsletter ...

2025-09-02T20:22:03Z

Bruno Garcia and Liam Eagen joined Optech to discuss Newsletter #369:

News
24:56 Update on differential fuzzing of Bitcoin and LN implementations
0:58 Garbled locks for accountable computing contracts

Selected Q&A from Bitcoin Stack Exchange
39:45 Is it possible to recover a private key from an aggregate public key under strong assumptions?
41:24 Are all taproot addresses vulnerable to quantum computing?
45:20 Why cant we set the chainstate obfuscation key?
52:09 Is it possible to revoke a spending branch after a block height?
53:45 Configure Bitcoin Core to use onion nodes in addition to IPv4 and IPv6 nodes?

Releases and release candidates
54:22 Bitcoin Core 29.1rc2
56:45 Core Lightning v25.09rc4

Notable code and documentation changes
57:37 Bitcoin Core #31802
1:04:46 LDK #3979
1:06:19 LND #10102
1:07:04 Rust Bitcoin #4907

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/09/02/

Fountain:
https://fountain.fm/episode/oGMUPbcYR5TSy63a4Zt8

Spotify:
https://open.spotify.com/episode/5uox6htE8nFOVXFc3Ju9Qq

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-369-recap/id1674626983?i=1000724614662

Bitcoin Optech Newsletter #369 is here: - shares an update on ...

2025-08-29T11:04:24Z

Bitcoin Optech Newsletter #369 is here:

- shares an update on differential fuzzing of Bitcoin and LN implementations
- links to a new paper about garbled locks for accountable computing contracts
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #369 Podcast
https://bitcoinops.org/en/newsletters/2025/08/29/

Bruno Garcia posted to Delving Bitcoin to describe recent progress and accomplishments of bitcoinfuzz, a library and related data for fuzz testing Bitcoin-based software and libraries...
https://bitcoinops.org/en/newsletters/2025/08/29/#update-on-differential-fuzzing-of-bitcoin-and-ln-implementations

Liam Eagen posted to the Bitcoin-Dev mailing list about a paper he’s written about a new mechanism for creating accountable computing contracts but based on garbled circuits...
https://bitcoinops.org/en/newsletters/2025/08/29/#garbled-locks-for-accountable-computing-contracts

Selected Q&A from Bitcoin Stack Exchange:
- Is it possible to recover a private key from an aggregate public key under strong assumptions?
- Are all taproot addresses vulnerable to quantum computing?
- Why cant we set the chainstate obfuscation key?
- Is it possible to revoke a spending branch after a block height?
- Configure Bitcoin Core to use onion nodes in addition to IPv4 and IPv6 nodes?
https://bitcoinops.org/en/newsletters/2025/08/29/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech Newsletter #368 is here: - summarizes a draft BIP ...

2025-08-22T10:39:52Z

Bitcoin Optech Newsletter #368 is here:

- summarizes a draft BIP for block template sharing between full nodes
- announces a library that allows trusted delegation of script evaluation
- summarizes changes to services/client software
- Optech Newsletter #368 Podcast
https://bitcoinops.org/en/newsletters/2025/08/22/

Anthony Towns posted to the Bitcoin-Dev mailing list the draft of a BIP for how nodes can communicate to their peers the transactions they would attempt to mine in their next block...
https://bitcoinops.org/en/newsletters/2025/08/22/#draft-bip-for-block-template-sharing

Josh Doman posted to Delving Bitcoin about a library he’s written that uses a trusted execution environment (TEE) that will only sign a taproot keypath spend if the transaction containing that spend satisfies a script...
https://bitcoinops.org/en/newsletters/2025/08/22/#trusted-delegation-of-script-evaluation

Changes to services and client software:
- ZEUS v0.11.3 released
- Rust Utreexo resources
- Peer-observer tooling and call to action
- Bitcoin Core Kernel-based node announced
- SimplicityHL released
- LSP plugin for BTCPay Server
- Proto mining hardware and software announced
- Oracle resolution demo using CSFS
- Relai adds taproot support
https://bitcoinops.org/en/newsletters/2025/08/22/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech Newsletter #367 is here: - LND v0.19.3-beta.rc1 - ...

2025-08-15T10:38:53Z

Bitcoin Optech Newsletter #367 is here:

- LND v0.19.3-beta.rc1
- Bitcoin Core 29.1rc1
- Optech Newsletter #367 Podcast
https://bitcoinops.org/en/newsletters/2025/08/15/

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Gloria Zhao and Mike Schmidt were joined by Tadge Dryja and ...

2025-08-13T17:09:17Z

Gloria Zhao and Mike Schmidt were joined by Tadge Dryja and Anthony Towns to discuss Newsletter #366:

- Draft BIPs proposed for Utreexo
- Continued discussion about lowering the minimum relay feerate
- Peer block template sharing to mitigate problems with divergent mempool policies
- A watch only wallet PR Review Club
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/08/12/

Fountain:
https://fountain.fm/episode/mb22hz065ESbbtqZvMy6

Spotify:
https://open.spotify.com/episode/58sQEBHrZ5Z22iUID6x5Je

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-366-recap/id1674626983?i=1000721833977

David Gumberg, Lauren Shareshian, Jameson Lopp, Steven Roose, and ...

2025-08-06T16:28:02Z

David Gumberg, Lauren Shareshian, Jameson Lopp, Steven Roose, and Tim Ruffing joined Optech to discuss Newsletter #365:

- Compact block prefilling
- Mempool-based fee estimation
- Migration from quantum-vulnerable outputs
- The OP_TEMPLATEHASH proposal
- Proposal to allow longer relative timelocks
- Security against quantum computers with taproot as a commitment scheme
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/08/05/

Spotify:
https://open.spotify.com/episode/65CJxx41a9UYQhCvHDrXWX

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-365-recap/id1674626983?i=1000720913277

You can listen on our website: ...

2025-07-31T15:58:17Z

In reply to nevent1q…vyhe
_________________________

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/07/29/

Fountain:
https://fountain.fm/episode/tQ7DBX3FTiiAzp6Sp0aD

Spotify:
https://open.spotify.com/episode/6nQ1pe8K4UAizGYslBD6HX

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-364-recap/id1674626983?i=1000720103505

Matt Morehouse and Jesse Posner (@jesseposner) joined Optech to ...

2025-07-31T15:55:42Z

Matt Morehouse and Jesse Posner (@jesseposner) joined Optech to discuss Newsletter #364:

News
0:53 LND gossip filter DoS vulnerability
15:16 Chain code withholding for multisig scripts
38:46 Research indicates common Bitcoin primitives are compatible with quantum-resistant signature algorithms

Selected Q&A from Bitcoin Stack Exchange
57:36 How does Bitcoin Core handle reorgs larger than 10 blocks?
1:01:29 Advantages of a signing device over an encrypted drive?
1:03:21 Spending a taproot output through the keypath and scriptpath?

Releases and release candidates
1:04:26 Libsecp256k1 v0.7.0

Notable code and documentation changes
1:05:16 Bitcoin Core #32521
1:15:00 Bitcoin Core #31829
1:19:51 LDK #3801
1:21:11 LDK #3842
1:21:57 BIPs #1890
1:23:53 BOLTs #1232

Bitcoin Optech newsletter #364 is here: - summarizes a ...

2025-07-25T12:26:00Z

Bitcoin Optech newsletter #364 is here:

- summarizes a vulnerability affecting old versions of LND
- describes an idea for improving privacy when using co-signer services
- examines the impact of switching to quantum-resistant signature algorithms on HD wallets, scriptless multisig, and silent payments
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #364 Recap
https://bitcoinops.org/en/newsletters/2025/07/25/

Matt Morehouse posted to Delving Bitcoin about a vulnerability affecting past versions of LND that he previously responsibly disclosed...
https://bitcoinops.org/en/newsletters/2025/07/25/#lnd-gossip-filter-dos-vulnerability

Jurvis Tan posted to Delving Bitcoin about research he performed with Jesse Posner into improving the privacy and security of multisig collaborative custody...
https://bitcoinops.org/en/newsletters/2025/07/25/#chain-code-withholding-for-multisig-scripts

Jesse Posner posted to Delving Bitcoin several links to research papers that indicate that quantum-resistant signature algorithms provide comparable primitives to those currently used in Bitcoin...
https://bitcoinops.org/en/newsletters/2025/07/25/#research-indicates-common-bitcoin-primitives-are-compatible-with-quantum-resistant-signature-algorithms

Selected Q&A from Bitcoin Stack Exchange:
- How does Bitcoin Core handle reorgs larger than 10 blocks?
- Advantages of a signing device over an encrypted drive?
- Spending a taproot output through the keypath and scriptpath?
https://bitcoinops.org/en/newsletters/2025/07/25/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

You can listen on our website: ...

2025-07-22T19:20:32Z

In reply to nevent1q…fygn
_________________________

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/07/22/

Spotify:
https://open.spotify.com/episode/1OufUqtuvQxEXOPJBsqAwH

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-363-recap/id1674626983?i=1000718502522

Davidson Souza joined Optech discuss Newsletter #363: Changes to ...

2025-07-22T19:19:02Z

Davidson Souza joined Optech discuss Newsletter #363:

Changes to services and client software
0:45 Floresta v0.8.0 released
20:38 RGB v0.12 announced
25:34 FROST signing device available
29:44 Gemini adds taproot support
38:14 Electrum 4.6.0 released

Releases and release candidates
38:51 LND v0.19.2-beta

Notable code and documentation changes
39:38 Bitcoin Core #32604
40:55 Bitcoin Core #32618
43:03 Bitcoin Core #31553
46:53 Core Lightning #7725
47:23 Eclair #2716
52:19 LDK #3628
53:22 LDK #3890
54:30 LND #10001

Josh Doman and Gloria Zhao joined Optech to discuss ...

2025-07-16T14:46:15Z

Josh Doman and Gloria Zhao joined Optech to discuss ⁠⁠Newsletter #362⁠⁠:

News
0:34 Compressed descriptors

Bitcoin Core PR Review Club
9:14 Improve TxOrphanage denial of service bounds

Releases and release candidates
46:22 LND v0.19.2-beta.rc2

Notable code and documentation changes
47:17 Core Lightning #8377
50:41 BDK #1957
51:18 BIPs #1888

Bitcoin Optech newsletter #362 is here: - briefly describes a new ...

2025-07-11T09:56:35Z

Bitcoin Optech newsletter #362 is here:

- briefly describes a new library allowing output script descriptors to be compressed for use in QR codes
- recaps the "Improve TxOrphanage denial of service bounds" PR Review Meeting
- #362 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/07/11/

Josh Doman posted to Delving Bitcoin to announce a library he’s written that encodes output script descriptors into a binary format that reduces their size by about 40%...
https://bitcoinops.org/en/newsletters/2025/07/11/#compressed-descriptors

Improve TxOrphanage denial of service bounds is a PR by glozow that changes TxOrphanage eviction logic to guarantee each peer the resources for at least 1 maximum-size package worth of orphan resolution...
https://bitcoinops.org/en/newsletters/2025/07/11/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Sanket Kanjalkar, Jonas Nick, Tadge Dryja, Steven Roose, and ...

2025-07-10T16:52:50Z

Sanket Kanjalkar, Jonas Nick, Tadge Dryja, Steven Roose, and Brandon Black joined Optech this week

News
2:06 Separating onion message relay from HTLC relay

Changing consensus
5:45 CTV+CSFS advantages for PTLCs

15:21 Vault output script descriptor

22:57 Continued discussion about CTV+CSFS advantages for BitVM

27:59 Open letter about CTV and CSFS

1:12:27 OP_CAT enables Winternitz signatures

1:22:46 Commit/reveal function for post-quantum recovery

1:53:31 OP_TXHASH variant with support for transaction sponsorship

Notable code and documentation changes
2:13:29 Bitcoin Core #32540

2:14:47 Bitcoin Core #32638

2:15:25 Bitcoin Core #32819

(2:17:41) LDK #3618

Sanket Kanjalkar, Jonas Nick, Tadge Dryja, Steven Roose, and ...

2025-07-10T14:42:27Z

Sanket Kanjalkar, Jonas Nick, Tadge Dryja, Steven Roose, and Brandon Black joined Optech this week to discuss:

- A new onion message network
- CTV+CSFS and benefits to PTLCs and BitVM
- Vault descriptors
- The CTV and CSFS open letter
- Winternitz signatures using OP_CAT
- Commit/reveal function for post-quantum recovery
- OP_TXHASH variant with support for transaction sponsorship
- And more

https://bitcoinops.org/en/podcast/2025/07/08/

Bitcoin Optech newsletter #361 is here: - describes a proposal to ...

2025-07-04T12:45:27Z

Bitcoin Optech newsletter #361 is here:

- describes a proposal to separate the network connections and peer management used for onion message relay from those used for HTLC relay in LN
- CTV+CSFS advantages for PTLCs
- Vault output script descriptor
- Continued discussion about CTV+CSFS advantages for BitVM
- Open letter about CTV and CSFS
- OP_CAT enables Winternitz signatures
- Commit/reveal function for post-quantum recovery
- OP_TXHASH variant with support for transaction sponsorship
- Optech Newsletter #361 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/07/04/

Olaluwa Osuntokun posted to Delving Bitcoin about allowing nodes to use separate connections for relaying onion messages than they use for relaying HTLCs...
https://bitcoinops.org/en/newsletters/2025/07/04/#separating-onion-message-relay-from-htlc-relay

Developers continued a previous discussion about the benefits of OP_CHECKTEMPLATEVERIFY (CTV), OP_CHECKSIGFROMSTACK (CSFS), or both together for various deployed and imagined protocols...
https://bitcoinops.org/en/newsletters/2025/07/04/#ctv-csfs-advantages-for-ptlcs

Sjors Provoost posted to Delving Bitcoin to discuss how the recovery information for a wallet using vaults could be specified using an output script descriptor...
https://bitcoinops.org/en/newsletters/2025/07/04/#vault-output-script-descriptor

Developers continued the previous discussion about how the availability of OP_CHECKTEMPLATEVERIFY (CTV) and OP_CHECKSIGFROMSTACK (CSFS) opcodes could “reduce [BitVM] transaction sizes by approximately 10x” and allow non-interactive peg-ins...
https://bitcoinops.org/en/newsletters/2025/07/04/#continued-discussion-about-ctv-csfs-advantages-for-bitvm

James O’Beirne posted an open letter to the Bitcoin-Dev mailing signed by 66 individuals (as of this writing), many of them contributors to Bitcoin-related projects...
https://bitcoinops.org/en/newsletters/2025/07/04/#open-letter-about-ctv-and-csfs

Developer Conduition posted to the Bitcoin-Dev mailing list a prototype implementation that uses the proposed OP_CAT opcode and other Script instructions to allow quantum-resistant signatures using the Winternitz protocol to be verified by consensus logic...
https://bitcoinops.org/en/newsletters/2025/07/04/#op-cat-enables-winternitz-signatures

Tadge Dryja posted to the Bitcoin-Dev mailing list a method for allowing individuals to spend UTXOs using quantum-vulnerable signature algorithms even if fast quantum computers would otherwise allow redirecting (stealing) the output of any attempted spend...
https://bitcoinops.org/en/newsletters/2025/07/04/#commit-reveal-function-for-post-quantum-recovery

Steven Roose posted to Delving Bitcoin about a variation on OP_TXHASH called TXSIGHASH that extends 64-byte schnorr signatures with additional bytes to indicate what fields in the transaction (or related transactions) the signature commits to...
https://bitcoinops.org/en/newsletters/2025/07/04/#op-txhash-variant-with-support-for-transaction-sponsorship

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today Daniela Brozzoni and Naiyoma joined ...

2025-07-01T19:31:39Z

Earlier today Daniela Brozzoni and Naiyoma joined Murch (nprofile…mzvs) and schmidty (nprofile…tz3n) to discuss Newsletter #360:

- Fingerprinting Bitcoin Core nodes
- Descriptors and BIP380
- Questions from the bitcoin stack exchange about blocking knots nodes, OP_CAT, compact blocks, selfish mining
- And more

Catch up:
https://bitcoinops.org/en/podcast/2025/07/01/

Bitcoin Optech newsletter #360 is here: - summarizes research ...

2025-06-27T10:32:04Z

Bitcoin Optech newsletter #360 is here:

- summarizes research about fingerprinting full nodes using P2P protocol messages
- seeks feedback about possibly removing support for H in BIP32 paths in the BIP380 specification of descriptors
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #360 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/06/27/

Daniela Brozzoni posted to Delving Bitcoin about research she conducted with developer Naiyoma into identifying the same node on multiple networks using the addr messages it sends...
https://bitcoinops.org/en/newsletters/2025/06/27/#fingerprinting-nodes-using-addr-messages

Ava Chow posted to the Bitcoin-Dev mailing list to ask whether any software generates descriptors using uppercase-H to indicate a hardened BIP32 key derivation step...
https://bitcoinops.org/en/newsletters/2025/06/27/#does-any-software-use-h-in-descriptors

Selected Q&A from Bitcoin Stack Exchange:

- Is there any way to block Bitcoin Knots nodes as my peers?
- What does OP_CAT do with integers?
- Async Block Relaying With Compact Block Relay (BIP152)
- Why is attacker revenue in selfish mining disproportional to its hash-power?
https://bitcoinops.org/en/newsletters/2025/06/27/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today, Bryan Bishop, Robin Linus, and Rene Pickhardt ...

2025-06-24T21:29:21Z

Earlier today, Bryan Bishop, Robin Linus, and Rene Pickhardt joined Murch (nprofile…mzvs) and schmidty (nprofile…tz3n) to cover:

- Restricting access to Bitcoin Core Project discussion
- Garbled circuits and BitVM3
- Updates on Lightning channel rebalancing research
- Cove Wallet, Liana, Stratum v2 STARK proofs, Breez
- And more!

Catch up:
https://bitcoinops.org/en/podcast/2025/06/24/

Earlier today, Antoine Poinsot, Peter Todd, Josh Doman, and ...

2025-06-17T22:22:51Z

Earlier today, Antoine Poinsot, Peter Todd, Josh Doman, and TheCharlatan joined us to discuss Newsletter #358:

- Selfish mining
- Transaction relay censorship resistance
- Updates to BIP390
- Encrypting descriptors
- The bitcoinkernel project
- And more

Catch up:
https://bitcoinops.org/en/podcast/2025/06/17/

Bitcoin Optech newsletter #358 is here: - describes how the ...

2025-06-13T10:44:53Z

Bitcoin Optech newsletter #358 is here:

- describes how the selfish mining danger threshold can be calculated
- summarizes an idea about preventing filtering of high feerate transactions
- seeks feedback about a proposed change to BIP390 musig() descriptors
- announces a new library for encrypting descriptors
- recaps the "Separate UTXO set access from validation functions" PR Review Meeting
- adds a Selfish Mining topic
- Optech Newsletter #358 Recap
https://bitcoinops.org/en/newsletters/2025/06/13/

Antoine Poinsot posted to Delving Bitcoin an expansion of the math from the 2013 paper that gave the selfish mining attack its name...
https://bitcoinops.org/en/newsletters/2025/06/13/#calculating-the-selfish-mining-danger-threshold

Peter Todd posted to the Bitcoin-Dev mailing list about a mechanism that would allow nodes to drop peers that are filtering high-feerate transactions...
https://bitcoinops.org/en/newsletters/2025/06/13/#relay-censorship-resistance-through-top-mempool-set-reconciliation

Ava Chow posted to the Bitcoin-Dev mailing list to ask if anyone objected to updating BIP390 to allow musig() expressions in output script descriptors to contain the same participant public key more than once...
https://bitcoinops.org/en/newsletters/2025/06/13/#updating-bip390-to-allow-duplicate-participant-keys-in-musig-expressions

Josh Doman posted to Delving Bitcoin to announce a library he’s built that encrypts the sensitive parts of an output script descriptor or miniscript to the public keys contained within it...
https://bitcoinops.org/en/newsletters/2025/06/13/#descriptor-encryption-library

'Separate UTXO set access from validation functions' is a PR by TheCharlatan that allows calling validation functions by passing just the required UTXOs, instead of requiring the complete UTXO set. It is part of the bitcoinkernel project...
https://bitcoinops.org/en/newsletters/2025/06/13/#bitcoin-core-pr-review-club

Selfish mining allows a miner (or cartel of miners) controlling less than a majority of hashrate to keep more block reward per unit of work than the majority of honest miners...
https://bitcoinops.org/en/topics/selfish-mining/

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Jose SK, Clara Shikhelman, Vojtěch Strnad, Robin Linus, and Dan ...

2025-06-12T19:22:24Z

Jose SK, Clara Shikhelman, Vojtěch Strnad, Robin Linus, and Dan Gould joined Murch (nprofile…mzvs) and schmidty (nprofile…tz3n) to discuss:

- Syncing full nodes without witnesses
- Quantum computing report
- Transaction weight limit with exception to prevent confiscation
- Removing outputs from the UTXO set based on value and time
- And More…

Catch up:
https://bitcoinops.org/en/podcast/2025/06/10/

Earlier today, @nprofile…mzvs and @nprofile…tz3n were joined ...

2025-06-03T22:40:37Z

Earlier today, Murch (nprofile…mzvs) and schmidty (nprofile…tz3n) were joined by Carla Kirk-Cohen, Joost Jager, and Elias Rohrer to discuss #356:

- Attributable failures and LN privacy
- Several P2P and policy questions from the Bitcoin Stack Exchange
- And more!

Catch up:
https://bitcoinops.org/en/podcast/2025/06/03/

Last week Dave Harding was joined by Alex Myers and Rodolfo Novak ...

2025-06-02T17:35:58Z

Last week Dave Harding was joined by Alex Myers and Rodolfo Novak to discuss Newsletter #355:

- Cake Wallet, Sparrow, Safe Wallet, COLDCARD, tx batching using payjoin, JoinMarket fidelity bonds, Bitcoin opcode documentation, Bitkey open sourced
- LND and CLN releases
- Bitcoin Core, CLN and LND PRs

Catch up:
https://bitcoinops.org/en/podcast/2025/05/27/

Bitcoin Optech newsletter #356 is here: - summarizes a discussion ...

2025-05-30T12:29:53Z

Bitcoin Optech newsletter #356 is here:

- summarizes a discussion about the possible effects of attributable failures on LN privacy
- summarizes popular Q&A from Stack Exchange
- adds an attributable failures topic
- Optech Newsletter #356 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/05/30/

Carla Kirk-Cohen posted to Delving Bitcoin an analysis of the possible consequences for the privacy of LN spenders and receivers if the network adopts attributable failures, particularly telling the spender the amount of time it took to forward a payment at each hop...
https://bitcoinops.org/en/newsletters/2025/05/30/#do-attributable-failures-reduce-ln-privacy

Selected Q&A from Bitcoin Stack Exchange:

- Which transactions get into blockreconstructionextratxn?
- Why would anyone use OP_RETURN over inscriptions, aside from fees?
- Why is my Bitcoin node not receiving incoming connections?
- How do I configure my node to filter out transactions larger than 400 bytes?
- What does “not publicly routable” node in Bitcoin Core P2P mean?
- Why would a node would ever relay a transaction?
- Is selfish mining still an option with compact blocks and FIBRE?
https://bitcoinops.org/en/newsletters/2025/05/30/#selected-qa-from-bitcoin-stack-exchange

Attributable failures are LN payment forwarding failures or delays that can be attributed to a pair of nodes, allowing spenders to avoid using slow or failure-prone nodes for future payments...
https://bitcoinops.org/en/topics/attributable-failures/

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #355 is here: - summarizes changes to ...

2025-05-23T11:36:28Z

Bitcoin Optech newsletter #355 is here:

- summarizes changes to services/client software
- LND 0.19.0-beta, Core Lightning 25.05rc1 releases
- Optech Newsletter #355 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/05/23/

Changes to services and client software:
- Cake Wallet added payjoin v2 support
- Sparrow adds pay-to-anchor features
- Safe Wallet 1.3.0 released
- COLDCARD Q v1.3.2 released
- Transaction batching using payjoin
- JoinMarket Fidelity Bond Simulator
- Bitcoin opcodes documented
- Bitkey code open sourced
https://bitcoinops.org/en/newsletters/2025/05/23/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Yesterday @nprofile…mzvs @nprofile…tz3n spoke with Eugene ...

2025-05-21T17:12:38Z

Yesterday Murch (nprofile…mzvs) schmidty (nprofile…tz3n) spoke with Eugene Siegel, Chris Stewart, Bram Cohen, and Robin Linus:

- A disclosed Bitcoin Core vulnerability
- 64 bit arithmetic draft BIP
- A new approach to recursive covenants
- BitVM benefits from CTV and CSFS
- And more

Catch up:
https://bitcoinops.org/en/podcast/2025/05/20/

Bitcoin Optech newsletter #354 is here: - describes a fixed ...

2025-05-16T11:01:26Z

Bitcoin Optech newsletter #354 is here:

- describes a fixed vulnerability affecting old versions of Bitcoin Core
- Changing consensus covering: 64-bit arithmetic in Script, Proposed opcodes for enabling recursive covenants through quines, benefits to BitVM from OP_CTV and OP_CSFS
- Optech Newsletter #354 Recap Podcast
https://bitcoinops.org/en/newsletters/2025/05/16/

Antoine Poinsot posted to the Bitcoin-Dev mailing list to announce a vulnerability affecting Bitcoin Core versions before 29.0...
https://bitcoinops.org/en/newsletters/2025/05/16/#vulnerability-disclosure-affecting-old-versions-of-bitcoin-core

Chris Stewart posted a draft BIP to the Bitcoin-Dev mailing list that proposes upgrading Bitcoin’s existing opcodes to operate on 64-bit numeric values...
https://bitcoinops.org/en/newsletters/2025/05/16/#proposed-bip-for-64-bit-arithmetic-in-script

Bram Cohen posted to Delving Bitcoin to suggest a set of simple opcodes that would enable the creation of recursive covenants through self-reproducing scripts (quines)...
https://bitcoinops.org/en/newsletters/2025/05/16/#proposed-opcodes-for-enabling-recursive-covenants-through-quines

Robin Linus posted to Delving Bitcoin about several of the improvements to BitVM that would become possible if the proposed OP_CTV and OP_CSFS opcodes were added to Bitcoin in a soft fork...
https://bitcoinops.org/en/newsletters/2025/05/16/#description-of-benefits-to-bitvm-from-op-ctv-and-op-csfs

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier this week @nprofile…mzvs and @nprofile…tz3n discussed ...

2025-05-15T14:42:53Z

Earlier this week Murch (nprofile…mzvs) and schmidty (nprofile…tz3n) discussed Newsletter #353 with Ruben Somsen, Salvatore Ingala, and Stéphan Vuylsteke:

- BIP30 consensus failure vulnerability
- Avoiding BIP32 path reuse
- Bitcoin Core’s multiprocess project
- And more…

Catch up:
https://bitcoinops.org/en/podcast/2025/05/13/

Bitcoin Optech newsletter #352 is here: - links to comparisons ...

2025-05-02T20:00:38Z

Bitcoin Optech newsletter #352 is here:

- links to comparisons between different cluster linearization techniques
- briefly summarizes discussion about increasing or removing Bitcoin Core’s OP_RETURN size limit
- Optech Newsletter #352 Recap
https://bitcoinops.org/en/newsletters/2025/05/02/

Pieter Wuille posted to Delving Bitcoin about some of the fundamental tradeoffs between three different cluster linearization techniques, following up with benchmarks of implementations of each...
https://bitcoinops.org/en/newsletters/2025/05/02/#comparison-of-cluster-linearization-techniques

In a thread on Bitcoin-Dev, several developers discussed changing or removing Bitcoin Core’s default limit for OP_RETURN data carrier outputs. A subsequent Bitcoin Core pull request saw additional discussion...
https://bitcoinops.org/en/newsletters/2025/05/02/#increasing-or-removing-bitcoin-core-s-op-return-size-limit

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today @nprofile…d0r5 and @nprofile…tz3n spoke with ...

2025-04-22T17:57:55Z

Earlier today Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) spoke with Niklas Gögge about Newsletter #350:

- Fuzz testing tool for Bitcoin nodes
- Message signing
- PSBTv2 explorer
- MPC Library
- Bitcoin Core 29.0
- And more!

Catch up:
https://bitcoinops.org/en/podcast/2025/04/22/

Bitcoin Optech newsletter #350 is here: - summarizes changes to ...

2025-04-18T12:06:15Z

Bitcoin Optech newsletter #350 is here:

- summarizes changes to services/client software
- Bitcoin Core 29.0
- issues a correction to some details from our story last week about SwiftSync
- Optech Newsletter #350 Recap
https://bitcoinops.org/en/newsletters/2025/04/18/

Changes to services and client software:
- Bitcoin Knots version 28.1.knots20250305 released
- PSBTv2 explorer announced
- LNbits v1.0.0 released
- The Mempool Open Source Project® v3.2.0 released
- Coinbase MPC library released
- Lightning Network liquidity tool released
- Versioned Storage Service announced
- Fuzz testing tool for Bitcoin nodes
- Bitcoin Control Board components open-sourced
https://bitcoinops.org/en/newsletters/2025/04/18/#changes-to-services-and-client-software

Bitcoin Core 29.0 is the latest major version of the network’s predominate full node. Its release notes describe several significant improvements...
https://bitcoinops.org/en/newsletters/2025/04/18/#bitcoin-core-29-0

Correction
Last week’s newsletter story about SwiftSync contained several errors and confusing statements...
https://bitcoinops.org/en/newsletters/2025/04/18/#correction

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #348 is here: - links to an educational ...

2025-04-04T11:39:49Z

Bitcoin Optech newsletter #348 is here:

- links to an educational implementation of elliptic curve cryptography for Bitcoin’s secp256k1 curve
- Changing consensus covering: discussions about quantum computer theft and resistance, a CTV+CSFS soft fork, OP_CHECKCONTRACTVERIFY semantics, and a consensus cleanup draft BIP
- Optech Newsletter #348 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/04/04/

Sebastian Falbesoner, Jonas Nick, and Tim Ruffing posted to the Bitcoin-Dev mailing list to announce a Python implementation of various functions related to the cryptography used in Bitcoin...
https://bitcoinops.org/en/newsletters/2025/04/04/#educational-and-experimental-based-secp256k1-implementation

Several conversations examined how Bitcoiners could respond to quantum computers becoming powerful enough to allow stealing bitcoins...
https://bitcoinops.org/en/newsletters/2025/04/04/#multiple-discussions-about-quantum-computer-theft-and-resistance

Several conversations examined various aspects of soft forking in the OP_CHECKTEMPLATEVERIFY (CTV) and OP_CHECKSIGFROMSTACK (CSFS) opcodes...
https://bitcoinops.org/en/newsletters/2025/04/04/#multiple-discussions-about-a-ctv-csfs-soft-fork

Salvatore Ingala posted to Delving Bitcoin to describe the semantics of the proposed OP_CHECKCONTRACTVERIFY (CCV) opcode, link to a first draft BIP, and link to an implementation draft for Bitcoin Core...
https://bitcoinops.org/en/newsletters/2025/04/04/#op-checkcontractverify-semantics

Antoine Poinsot posted to the Bitcoin-Dev mailing list a link to a draft BIP he’s written for the consensus cleanup soft fork proposal. It includes several fixes...
https://bitcoinops.org/en/newsletters/2025/04/04/#draft-bip-published-for-consensus-cleanup

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today, ...

2025-04-02T17:17:36Z

Earlier today, nprofile1qqsf2ds69dp2ympzhtpmdd46f3w2cnfkjphtpnaesf5xs8z95vqu2xqytd0r5 and schmidty (nprofile…tz3n) were joined by Sjors Provoost and Antoine Poinsot to discuss Newsletter #347:

- Fee-Based Spam Prevention For Lightning
- Testnets 3, Testnet 4
- Taproot annexes
- BIP30, BIP34, witness commitments, and the block 1,983,702 problem
- Malleating any 64-byte transactions
- And more!

Catch up:
https://bitcoinops.org/en/podcast/2025/04/01/

Bitcoin Optech newsletter #347 is here: - describes upfront and ...

2025-03-28T10:57:34Z

Bitcoin Optech newsletter #347 is here:

- describes upfront and hold fees in LN based on burnable outputs
- summarizes discussion about testnets 3 and 4
- announces a plan to relay certain transactions containing taproot annexes
- summarizes popular Q&A from Stack Exchange
- Bitcoin Core 29.0rc2
- Optech Newsletter #347 Recap
https://bitcoinops.org/en/newsletters/2025/03/28/

John Law posted to Delving Bitcoin the summary of a paper he’s written about a protocol nodes can use to charge two additional types of fees for forwarding payments...
https://bitcoinops.org/en/newsletters/2025/03/28/#ln-upfront-and-hold-fees-using-burnable-outputs

Sjors Provoost posted to the Bitcoin-Dev mailing list to ask whether anyone was still using testnet3 now that testnet4 has been available for about six months...
https://bitcoinops.org/en/newsletters/2025/03/28/#discussion-of-testnets-3-and-4

Peter Todd announced to the Bitcoin-Dev mailing list his plan to update his Bitcoin Core-based node, Libre Relay, to begin relaying transactions containing taproot annexes if they follow particular rules...
https://bitcoinops.org/en/newsletters/2025/03/28/#plan-to-relay-certain-taproot-annexes

Selected Q&A from Bitcoin Stack Exchange:
- Why is the witness commitment optional?
- Can all consensus valid 64 byte transactions be (third party) malleated to change their size?
- How long does it take for a transaction to propagate through the network?
- Utility of longterm fee estimation
- Why are two anchor outputs are used in the LN?
- Why are there no BIPs in the 2xx range?
- Why doesn’t Bech32 use the character “b”?
- Bech32 error detection and correction reference implementation
- How to safely spend/burn dust?
- How is the refund transaction in Asymmetric Revocable Commitments constructed?
- Which applications use ZMQ with Bitcoin Core?
https://bitcoinops.org/en/newsletters/2025/03/28/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Core 29.0rc2 is a release candidate for the next major version of the network’s predominate full node. Please see the version 29 testing guide.
https://github.com/bitcoin-core/bitcoin-devwiki/wiki/29.0-Release-Candidate-Testing-Guide

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Yesterday @nprofile…d0r5 and @nprofile…tz3n were joined by ...

2025-03-26T15:30:28Z

Yesterday Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) were joined by Matt Morehouse, Yong Yu, Alejandro De La Torre, Jan B, and Marco De Leon to discuss Newsletter #346:

- LND's dynamic feerate adjustment system
- DMND launching pooled mining
- Bitcoin Core 29.0rc2 and testing guide
- Removing checkpoints in Bitcoin Core
- And more!

Catch up:
https://bitcoinops.org/en/podcast/2025/03/25/

Last week @nprofile…d0r5 and @nprofile…tz3n were joined by ...

2025-03-24T16:45:16Z

Last week Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) were joined by Sindura Saraswathi, Christian Kümmerle, and Stéphan Vuylsteke to discuss Newsletter #345:

- P2P traffic analysis
- Research into single-path LN pathfinding
- Probabilistic payments using different hash functions as an xor function
- A Bitcoin Core PR Review Club on invalid blocks
- Notarizing macOS and codesigning Bitcoin Core on Windows and macOS
- and more…

Catch up:
https://bitcoinops.org/en/podcast/2025/03/18/

Bitcoin Optech newsletter #346 is here: - summarizes a discussion ...

2025-03-21T13:51:06Z

Bitcoin Optech newsletter #346 is here:

- summarizes a discussion about LND’s updated dynamic feerate adjustment system
- summarizes changes to services/client software
- Bitcoin Core 29.0rc2
- Optech Newsletter #346 Recap
https://bitcoinops.org/en/newsletters/2025/03/21/

Matt Morehouse posted to Delving Bitcoin a description of LND’s recently-rewritten sweeper system, which determines the feerates to use for onchain transactions (including RBF fee bumps)...
https://bitcoinops.org/en/newsletters/2025/03/21/#discussion-of-lnd-s-dynamic-feerate-adjustment-system

Changes to services and client software:

- Wally 1.4.0 released
- Bitcoin Core Config Generator announced
- A regtest development environment container
- Explora transaction visualization tool
- Hashpool v0.1 tagged
- DMND launching pooled mining
- Krux adds taproot and miniscript
- Source-available secure element announced
- Nunchuk launches Group Wallet
- FROSTR protocol announced
- Bark launches on signet
- Cove Bitcoin wallet announced
https://bitcoinops.org/en/newsletters/2025/03/21/#changes-to-services-and-client-software

Bitcoin Core 29.0rc2 is a release candidate for the next major version of the network’s predominate full node.
https://bitcoinops.org/en/newsletters/2025/03/21/#bitcoin-core-29-0rc2

Bitcoin Optech will host an audio recap discussion of this newsletter streaming on Riverside.fm and X/Twitter Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #345 is here: - looks at an analysis of ...

2025-03-14T10:53:30Z

Bitcoin Optech newsletter #345 is here:

- looks at an analysis of P2P traffic experienced by a typical full node
- summarizes research into LN pathfinding
- describes a new approach for creating probabilistic payments
- recaps the "Stricter internal handling of invalid blocks " PR Review Meeting
- Optech Newsletter #345 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/03/14/

Developer Virtu posted to Delving Bitcoin an analysis of the network traffic generated and received by his node in four different modes: initial block download (IBD), non-listening (outbound connections only), non-archival (pruned) listening, and archival listening...
https://bitcoinops.org/en/newsletters/2025/03/14/#p2p-traffic-analysis

Sindura Saraswathi posted to Delving Bitcoin about research she conducted with Christian Kümmerle about finding optimal paths between LN nodes for sending payments in a single part...
https://bitcoinops.org/en/newsletters/2025/03/14/#research-into-single-path-ln-pathfinding

Robin Linus replied to the Delving Bitcoin thread about probabilistic payments with a conceptually simple script that allows two parties to each commit to an arbitrary amount of entropy that can later be revealed and xored together, to produce a value that can be used to determine which one of them receives a payment...
https://bitcoinops.org/en/newsletters/2025/03/14/#probabilistic-payments-using-different-hash-functions-as-an-xor-function

'Stricter internal handling of invalid blocks' is a PR by mzumsande that improves the correctness of two non-consensus-critical and expensive-to-calculate validation fields by immediately updating them when a block is marked as invalid...
https://bitcoinops.org/en/newsletters/2025/03/14/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today @nprofile…d0r5 and @nprofile…tz3n were joined ...

2025-03-11T19:41:09Z

Earlier today Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) were joined by Matt Morehouse , matt (nprofile…z2zr) , and HunterBeast (nprofile…0g64) to discuss Newsletter #343:

- LND vulnerability
- Bitcoin Core’s priorities
- Bitcoin Forking Guide
- Update on BIP360 pay-to-quantum-resistant-hash (P2QRH)
- Private block template marketplace to prevent centralizing MEV
- and more!

Catch up:
https://bitcoinops.org/en/podcast/2025/03/11/

Bitcoin Optech newsletter #344 is here: - announces the ...

2025-03-07T13:14:19Z

Bitcoin Optech newsletter #344 is here:

- announces the disclosure of a vulnerability affecting old versions of LND
- summarizes a discussion about the Bitcoin Core Project’s priorities
- Changing consensus covering: Bitcoin Forking Guide, BIP360 pay-to-quantum-resistant-hash (P2QRH) updates, and Private block template marketplace to prevent centralizing MEV
- Optech Newsletter #344 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/03/07/

Matt Morehouse posted to Delving Bitcoin to announce the responsible disclosure of a vulnerability that affected LND versions before 0.18...
https://bitcoinops.org/en/newsletters/2025/03/07/#disclosure-of-fixed-lnd-vulnerability-allowing-theft

Several blog posts by Antoine Poinsot about the future of the Bitcoin Core project were linked in a thread on Delving Bitcoin...
https://bitcoinops.org/en/newsletters/2025/03/07/#discussion-about-bitcoin-core-s-priorities

Anthony Towns announced to Delving Bitcoin a guide to how to build community consensus for changes to Bitcoin’s consensus rules...
https://bitcoinops.org/en/newsletters/2025/03/07/#bitcoin-forking-guide

Developer Hunter Beast posted an update on his research into quantum resistance for BIP360 to the Bitcoin-Dev mailing list...
https://bitcoinops.org/en/newsletters/2025/03/07/#update-on-bip360-pay-to-quantum-resistant-hash-p2qrh

Matt Corallo and developer 7d5x9 posted to Delving Bitcoin about allowing parties to bid in public markets for selected space within miner block templates...
https://bitcoinops.org/en/newsletters/2025/03/07/#private-block-template-marketplace-to-prevent-centralizing-mev

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #343 is here: - summarizes a post about ...

2025-02-28T12:29:06Z

Bitcoin Optech newsletter #343 is here:

- summarizes a post about having full nodes ignore transactions that are relayed without being requested first
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #343 Recap on Riverside

https://bitcoinops.org/en/newsletters/2025/02/28/

Antoine Riard posted to Bitcoin-Dev two draft BIPs that would allow a node to signal that it will no longer accept tx messages that it had not requested using an inv message, called unsolicited transactions...
https://bitcoinops.org/en/newsletters/2025/02/28/#ignoring-unsolicited-transactions

Selected Q&A from Bitcoin Stack Exchange:

- What’s the rationale for how the loadtxsoutset RPC is set up?
- Are there pinning attacks that RBF rule #3 makes impossible?
- Unexpected locktime values
- Why is it necessary to reveal a bit in a script path spend and check that it matches the parity of the Y coordinate of Q?
- Why does Bitcoin Core use checkpoints??
- How does Bitcoin Core handle long reorgs?
- What is discard feerate?
- Policy to miniscript compiler
https://bitcoinops.org/en/newsletters/2025/02/28/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today @nprofile…d0r5 and @nprofile…tz3n discussed ...

2025-02-18T20:07:06Z

Earlier today Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) discussed Bitcoin Optech Newsletter #341:

- probabilistic payments
- ephemeral anchors
- Bitcoin network monitoring and orphan evictions
- BIP3
- cluster mempool
... and more!

Catch up:
https://bitcoinops.org/en/podcast/2025/02/18/

Earlier this week Optech was joined by Matt Morehouse, Johan ...

2025-02-15T10:06:19Z

Earlier this week Optech was joined by Matt Morehouse, Johan Halseth, Pieter Wuille, Sergi Delgado, Bastien Teinturier, Oleksandr Kurbatov, Antoine Poinsot and Bob McElrath to discuss Newsletter #340.

Catch up:
https://bitcoinops.org/en/podcast/2025/02/11/

Bitcoin Optech newsletter #340 is here: - announces a fixed ...

2025-02-07T11:23:40Z

Bitcoin Optech newsletter #340 is here:

- announces a fixed vulnerability affecting LDK
- summarizes discussion about zero-knowledge gossip for LN channel announcements
- describes the discovery of previous research that can be applied to finding optimal cluster linearizations
- provides an update on the development of the Erlay protocol for reducing transaction relay bandwidth
- looks at tradeoffs between different scripts for implementing LN ephemeral anchors
- relays a proposal for emulating an OP_RAND opcode in a privacy-preserving manner with no consensus changes required
- points to renewed discussion about lowering the minimum transaction feerate
- Optech Newsletter #340 Recap on Riverside

https://bitcoinops.org/en/newsletters/2025/02/07/

Matt Morehouse posted to Delving Bitcoin to announce a vulnerability affecting LDK that he responsibly disclosed and which was fixed in LDK version 0.1.1...
https://bitcoinops.org/en/newsletters/2025/02/07/#channel-force-closure-vulnerability-in-ldk

Johan Halseth posted to Delving Bitcoin with an extension to the proposed 1.75 channel announcement protocol that would allow other nodes to verify that a channel was backed by a funding transaction, preventing multiple cheap DoS attacks, but without revealing which UTXO is the funding transaction—enhancing privacy...
https://bitcoinops.org/en/newsletters/2025/02/07/#zero-knowledge-gossip-for-ln-channel-announcements

Stefan Richter posted to Delving Bitcoin about a research paper from 1989 he found that has a proven algorithm that can be used to efficiently find the highest-feerate subset of a group of transactions that will be topologically valid if the subset is included in a block...
https://bitcoinops.org/en/newsletters/2025/02/07/#discovery-of-previous-research-for-finding-optimal-cluster-linearization

Sergi Delgado made several posts to Delving Bitcoin about his work over the past year implementing Erlay for Bitcoin Core...
https://bitcoinops.org/en/newsletters/2025/02/07/#erlay-update

Bastien Teinturier posted to Delving Bitcoin to ask for opinions about what ephemeral anchor script should be used as one of the outputs to TRUC-based LN commitment transactions as a replacement for existing anchor outputs...
https://bitcoinops.org/en/newsletters/2025/02/07/#tradeoffs-in-ln-ephemeral-anchor-scripts

Oleksandr Kurbatov posted to Delving Bitcoin about an interactive protocol that allows two parties to make a contract that will pay out in a way that neither can predict, which is functionally equivalent to randomly...
https://bitcoinops.org/en/newsletters/2025/02/07/#emulating-op-rand

Greg Tonoski posted to the Bitcoin-Dev mailing list about lowering the default minimum transaction relay feerate...
https://bitcoinops.org/en/newsletters/2025/02/07/#discussion-about-lowering-the-minimum-transaction-relay-feerate

Antoine Poinsot made several posts to the Delving Bitcoin thread about the consensus cleanup soft fork suggesting parameter changes...
https://bitcoinops.org/en/newsletters/2025/02/07/#updates-to-cleanup-soft-fork-proposal

Bob McElrath posted to Delving Bitcoin requesting developers working on covenant designs to consider how their favorite proposal, or a new proposal, could assist in the creation of an efficient decentralized mining pool...
https://bitcoinops.org/en/newsletters/2025/02/07/#request-for-a-covenant-design-supporting-braidpool

A thread from April 2024 received renewed attention this past month. Previously, Bob McElrath posted about having miners commit to the transactions in their mempool and then only allowing them to include transactions in their blocks that were deterministically selected from previous commitments...
https://bitcoinops.org/en/newsletters/2025/02/07/#deterministic-transaction-selection-from-a-committed-mempool

Developer Zawy posted to Delving Bitcoin about a mining difficulty adjustment algorithm (DAA) for a directed acyclic graph (DAG) type blockchain...
https://bitcoinops.org/en/newsletters/2025/02/07/#fast-difficulty-adjustment-algorithm-for-a-dag-blockchain

Difficulty adjustment algorithms
Difficulty adjustment algorithms (DAAs) are the methods by which mining difficulty is regulated, which affects the average time between blocks, the total amount of block space, and the rate of distribution of new bitcoins (the block subsidy)...
https://bitcoinops.org/en/topics/difficulty-adjustment-algorithms/

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Matt Morehouse, Bastien Teinturier, Bob McElrath, and Antoine Poinsot on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #339 is here: - describes a ...

2025-01-31T14:08:50Z

Bitcoin Optech newsletter #339 is here:

- describes a vulnerability affecting older versions of LDK
- looks at a newly disclosed aspect of a vulnerability originally published in 2023
- summarizes renewed discussion about compact block reconstruction statistics
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #339 Recap on Riverside

Matt Morehouse posted to Delving Bitcoin to disclose a vulnerability affecting LDK that he responsibly disclosed and which was fixed in LDK version 0.1...

Antoine Riard posted to the Bitcoin-Dev mailing list to disclose an additional vulnerability possible with the replacement cycling attack he originally publicly disclosed in 2023...

Developer 0xB10C posted to Delving Bitcoin updated stats on the frequency at which his Bitcoin Core nodes needed to request additional transactions to perform compact block reconstruction...

Selected Q&A from Bitcoin Stack Exchange:

- Who uses or wants to use PSBTv2 (BIP370)?
- In the bitcoin’s block genesis, which parts can be filled arbitrarily?
- Lightning force close detection
- Is a segwit-formatted transaction with all inputs of non-witness program type valid?
- P2TR Security Question
- What exactly is being done today to make Bitcoin “quantum-safe”?
- What are the harmful effects of a shorter inter-block time?
- Could proof-of-work be used to replace policy rules?
- How does MuSig work in real Bitcoin scenarios?
- How does the -blocksxor switch that obfuscates the blocks.dat files work?
- How does the related key attack on Schnorr signatures work?

https://bitcoinops.org/en/newsletters/2025/01/31/

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Matt Morehouse on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today @nprofile…d0r5 and @nprofile…tz3n sat down with ...

2025-01-28T18:24:06Z

Earlier today Murch (nprofile…d0r5) and schmidty (nprofile…tz3n) sat down with Andrew Toth and David A. Harding (nprofile…cvw0) to discuss Newsletter #338:

- unspendable script descriptor expression
- who is using PSBTs v2 and why?
- Off chain rolling DLCs
-12 changes to services and client software

Catch up:
https://bitcoinops.org/en/podcast/2025/01/28/

Earlier today @nprofile…d0r5 and @nprofile…x9le were joined ...

2025-01-21T17:35:08Z

Earlier today Murch (nprofile…d0r5) and schmidty (nprofile…x9le) were joined by vnprc (nprofile…mthn) to discuss Newsletter #337:

- Continued discussion about rewarding pool miners with tradeable ecash shares
- LDK v0.1
and more

Catch up:
https://bitcoinops.org/en/podcast/2025/01/21/

Bitcoin Optech newsletter #337 is here: - summarizes continued ...

2025-01-17T12:47:17Z

Bitcoin Optech newsletter #337 is here:

- summarizes continued discussion about rewarding pool miners with tradeable ecash shares
- describes a new proposal for enabling offchain resolution of DLCs
- Optech Newsletter #337 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/01/17/

Discussion continued since our previous summary of a Delving Bitcoin thread about paying pool miners with ecash for each share they submitted...
https://bitcoinops.org/en/newsletters/2025/01/17/#continued-discussion-about-rewarding-pool-miners-with-tradeable-ecash-shares

Developer conduition posted to the DLC-dev mailing list about a contract protocol that allows an offchain spend of the funding transaction signed by both parties to create multiple DLCs...
https://bitcoinops.org/en/newsletters/2025/01/17/#offchain-dlcs

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Earlier today Murch and Schmidty discussed Newsletter #336 with ...

2025-01-14T19:10:08Z

Earlier today Murch and Schmidty discussed Newsletter #336 with Abubakar Sadiq, Gregory Sanders, and Daniel Roberts:

- Double coinbase reservation
- LN-Symmetry
and more...

Catch up:
https://bitcoinops.org/en/podcast/2025/01/14/

Bitcoin Optech newsletter #336 is here: - describes a potential ...

2025-01-10T11:11:30Z

Bitcoin Optech newsletter #336 is here:

- describes a potential change to Bitcoin Core affecting miners
- summarizes discussion about creating contract-level relative timelocks
- discusses a proposal for an LN-Symmetry variant with optional penalties
- Optech Newsletter #336 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/01/10/

Abubakar Sadiq Ismail posted to Delving Bitcoin about a bug discovered in 2021 by Antoine Riard that results in nodes reserving 2,000 vbytes in block templates for coinbase transactions rather than the intended 1,000 vbytes...
https://bitcoinops.org/en/newsletters/2025/01/10/#investigating-mining-pool-behavior-before-fixing-a-bitcoin-core-bug

Gregory Sanders posted to Delving Bitcoin about finding a solution for a complication he discovered about a year ago when creating a proof-of-concept implementation of LN-Symmetry...
https://bitcoinops.org/en/newsletters/2025/01/10/#contract-level-relative-timelocks

Daniel Roberts posted to Delving Bitcoin about preventing a malicious channel counterparty (Mallory) from being able to delay channel settlement by deliberately broadcasting old states at a higher feerate than an honest counterparty (Bob) is paying for confirmation of the final state...
https://bitcoinops.org/en/newsletters/2025/01/10/#multiparty-ln-symmetry-variant-with-penalties-for-limiting-published-updates

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Abubakar Sadiq Ismail and Gregory Sanders on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Yesterday @nprofile…lyyy and @nprofile…x9le were joined by ...

2025-01-08T16:13:01Z

Yesterday David A. Harding (nprofile…lyyy) and schmidty (nprofile…x9le) were joined by Yuval Kogman, Jeremy Rubin, and Steve Myers to discuss Newsletter #335:

- Attacks on centralized coinjoin
- ChillDKG
- Changing consensus
- BDK 1.0.0

Catch up:
https://bitcoinops.org/en/podcast/2025/01/07/

Bitcoin Optech would like your feedback! Let us know in this ...

2025-01-03T16:15:24Z

Bitcoin Optech would like your feedback!

Let us know in this survey what parts of the newsletter and website are valuable for you and how we can make Optech an even better Bitcoin technical resource.

https://forms.gle/RknVv5Etx4D5MVVt8

Bitcoin Optech newsletter #335 is here: - links to information ...

2025-01-03T15:22:07Z

Bitcoin Optech newsletter #335 is here:

- links to information about longstanding deanonymization vulnerabilities in software using centralized coinjoin protocols
- summarizes an update to a draft BIP about the ChillDKG distributed key generation protocol compatible with scriptless threshold signing
- adds a new monthly section summarizing proposals and discussion about changing Bitcoin’s consensus rules
- Optech Newsletter #335 Recap on Riverside
https://bitcoinops.org/en/newsletters/2025/01/03/

Yuval Kogman posted to the Bitcoin-Dev mailing list details about several privacy-reducing vulnerabilities in the centralized coinjoin protocols used by current versions of the Wasabi and Ginger wallets, plus past versions of the Samourai, Sparrow, and Trezor Suite software wallets...
https://bitcoinops.org/en/newsletters/2025/01/03/#deanonymization-attacks-against-centralized-coinjoin

Tim Ruffing and Jonas Nick posted to the Bitcoin-Dev mailing list a link to the current draft BIP for ChillDKG, which describes a distributed key generation protocol compatible with FROST scriptless threshold signatures for Bitcoin...
https://bitcoinops.org/en/newsletters/2025/01/03/#updated-chilldkg-draft

Changing consensus:

- CTV enhancement opcodes
- Adjusting difficulty beyond 256 bits
- Transitory soft forks for cleanup soft forks
- Quantum computer upgrade path
- Consensus cleanup timewarp grace period
https://bitcoinops.org/en/newsletters/2025/01/03/#changing-consensus

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Yuval Kogman on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #334: 2024 Year-in-Review Special is ...

2024-12-20T12:48:35Z

Bitcoin Optech newsletter #334: 2024 Year-in-Review Special is here:

- notes Bitcoin developments during each month of 2024
- feature: Vulnerability disclosures
- feature: Cluster mempool
- feature: P2P transaction relay
- feature: Covenants and script upgrades
- feature: Major releases of popular infrastructure projects
- feature: Optech
https://bitcoinops.org/en/newsletters/2024/12/20/

In 2024, Optech summarized more than two dozen vulnerability disclosures...
https://bitcoinops.org/en/newsletters/2024/12/20/#vulnreports

An idea for a mempool redesign from 2023 became a particular focus for several Bitcoin Core developers throughout 2024...
https://bitcoinops.org/en/newsletters/2024/12/20/#cluster

Fee management has always been a challenge in the decentralized Bitcoin protocol, but widespread use of contract protocols such as LN-Penalty and ongoing research into newer and more complex protocols has made it more important than ever to ensure users can pay and increase fees on demand. Bitcoin Core contributors have been working on this problem for years, and 2024 saw the public release of several new features that significantly improve the situation...
https://bitcoinops.org/en/newsletters/2024/12/20/#p2prelay

Several developers devoted much of their time in 2024 towards advancing proposals for covenants, scripting upgrades, and other changes that would support advanced contract protocols such as joinpools and channel factories...
https://bitcoinops.org/en/newsletters/2024/12/20/#covs

Optech covered major releases of popular infrastructure projects throughout the year...
https://bitcoinops.org/en/newsletters/2024/12/20/#releases

In Optech’s seventh year, we published:

- 51 newsletters
- 35 new topic pages
- over 120,000 words, a 350pg book equivalent
- a wallet guide for developers
- over 59hr of podcasts, with 488,000 words of transcripts w/75 guests
- 200+ non-English translations
https://bitcoinops.org/en/newsletters/2024/12/20/#optech

Bitcoin Optech will host an audio recap discussion of this special newsletter with special guests Dave Harding, Niklas Gögge, Gloria Zhao, and Brandon Black on Riverside.fm Monday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #333 is here: - describes a ...

2024-12-13T11:39:32Z

Bitcoin Optech newsletter #333 is here:

- describes a vulnerability that allowed stealing from old versions of various LN implementations
- announces a deanonymization vulnerability affecting Wasabi and related software
- summarizes a post and discussion about LN channel depletion
- links to a poll for opinions about selected covenant proposals
- describes two types of incentive-based pseudo-covenants
- references summaries of the periodic in-person Bitcoin Core developer meeting
- recaps the "Track and use all potential peers for orphan resolution" PR Review Meeting
- summarizes changes to services/client software
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #333 Recap on Riverside

https://bitcoinops.org/en/newsletters/2024/12/13/

David Harding announced to Delving Bitcoin a vulnerability he had responsibly disclosed earlier in the year. Old versions of Eclair, LDK, and LND with default settings allowed the party who opened a channel to steal up to 98% of channel value...
https://bitcoinops.org/en/newsletters/2024/12/13/#vulnerability-allowing-theft-from-ln-channels-with-miner-assistance

A developer of GingerWallet disclosed a method a coinjoin coordinator could use to prevent users from gaining any privacy during a coinjoin...
https://bitcoinops.org/en/newsletters/2024/12/13/#deanonymization-vulnerability-affecting-wasabi-and-related-software

René Pickhardt posted to Delving Bitcoin and participated, along with Christian Decker, in an Optech Deep Dive about his research into the mathematical foundations of payment channel networks...
https://bitcoinops.org/en/newsletters/2024/12/13/#insights-into-channel-depletion

/dev/fd0 posted to the Bitcoin-Dev mailing list a link to a public poll of developer opinions about selected covenant proposals...
https://bitcoinops.org/en/newsletters/2024/12/13/#poll-of-opinions-about-covenant-proposals

Jeremy Rubin posted to the Bitcoin-Dev mailing list a link to a paper he authored about oracle-assisted covenants. The model involves two oracles: a covenant oracle and an integrity oracle...
https://bitcoinops.org/en/newsletters/2024/12/13/#incentive-based-pseudo-covenants

Many Bitcoin Core developers met in person in October, and several notes from the meeting have now been published...
https://bitcoinops.org/en/newsletters/2024/12/13/#bitcoin-core-developer-meeting-summaries

'Track and use all potential peers for orphan resolution' is a PR by glozow that improves the reliability of orphan resolution by letting the node request missing ancestors from all peers instead of just the one that announced the orphan...
https://bitcoinops.org/en/newsletters/2024/12/13/#bitcoin-core-pr-review-club

Changes to services and client software:

- Java-based HWI released
- Saving Satoshi Bitcoin development education game announced
- Neovim Bitcoin Script plugin
- Proton Wallet adds RBF
https://bitcoinops.org/en/newsletters/2024/12/13/#changes-to-services-and-client-software

Selected Q&A from Bitcoin Stack Exchange:

- How long does Bitcoin Core store forked chains?
- What is the point of solo mining pools?
- Is there a point to using P2TR over P2WSH if I only want to use the script path?
https://bitcoinops.org/en/newsletters/2024/12/13/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Dave Harding and /dev/fd0 on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #332 is here: - announces the ...

2024-12-06T12:17:20Z

Bitcoin Optech newsletter #332 is here:

- announces the disclosure of a transaction censorship vulnerability
- summarizes discussion about the consensus cleanup soft fork proposal
- Optech Newsletter #332 Recap on Riverside
https://bitcoinops.org/en/newsletters/2024/12/06/

Antoine Riard posted to the Bitcoin-Dev mailing list about a method for preventing a node from broadcasting a transaction belonging to a connected wallet...
https://bitcoinops.org/en/newsletters/2024/12/06/#transaction-censorship-vulnerability

Antoine Poinsot posted to the existing Delving Bitcoin thread about the consensus cleanup soft fork proposal. In addition to the already proposed fix for the classic time warp vulnerability, he proposed also including a fix for the recently discovered Zawy-Murch time warp...
https://bitcoinops.org/en/newsletters/2024/12/06/#continued-discussion-about-consensus-cleanup-soft-fork-proposal

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Antoine Poinsot on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

We needed to move this discussion with AJ Towns to 14:30 UTC ...

2024-12-03T13:56:21Z

In reply to nevent1q…tzt6
_________________________

We needed to move this discussion with AJ Towns to 14:30 UTC today.

Hope to see you there!

https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #331 is here: - summarizes several ...

2024-11-29T14:31:29Z

Bitcoin Optech newsletter #331 is here:

- summarizes several recent discussions about a Lisp dialect for Bitcoin scripting
- adds a Basic Bitcoin Lisp Language topic
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #331 Recap on Riverside
https://bitcoinops.org/en/newsletters/2024/11/29/

Anthony Towns made several posts about a continuation of his work on creating a Lisp dialect for Bitcoin that could be added to Bitcoin in a soft fork...
https://bitcoinops.org/en/newsletters/2024/11/29/#lisp-dialect-for-bitcoin-scripting

Basic Bitcoin Lisp language (bll) is a proposed scripting language that could be added to Bitcoin in a soft fork...
https://bitcoinops.org/en/topics/basic-bitcoin-lisp-language/

Selected Q&A from Bitcoin Stack Exchange:

- How does ColliderScript improve Bitcoin?
- Why do standardness rules limit tx weight?
- Is the scriptSig spending a P2A output expected to be empty?
- What happens to the unused P2As?
- Why doesn’t Bitcoin’s PoW algorithm use a chain of hashes?
- Clarification on false value in Script
- What is this micro tx?
- Are there any UTXOs that cant be spent?
- Why wasnt BIP34 implemented in the coinbase tx’s locktime or nSequence?

https://bitcoinops.org/en/newsletters/2024/11/29/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest AJ Towns on Riverside.fm Tuesday at 20:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #330 is here: - summarizes a proposed ...

2024-11-22T13:52:19Z

Bitcoin Optech newsletter #330 is here:

- summarizes a proposed change to the LN spec to allow pluggable channel factories
- links to a report and a new website for examining transactions on the default signet that use proposed soft forks
- describes an update to the LNHANCE multi-part soft fork proposal
- discusses a paper about covenants based on grinding rather than consensus changes
- summarizes changes to services/client software
- #330 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/11/22/

ZmnSCPxj posted to Delving Bitcoin a proposal to make a small set of changes to the BOLT specification to allow existing LN software to manage LN-Penalty payment channels within a channel factory using a software plugin...
https://bitcoinops.org/en/newsletters/2024/11/22/#pluggable-channel-factories

Anthony Towns posted to Delving Bitcoin a summary of activity on the default signet related to proposed soft forks available through Bitcoin Inquisition...
https://bitcoinops.org/en/newsletters/2024/11/22/#signet-activity-report

Moonsettler posted to Delving Bitcoin and also the Bitcoin-Dev mailing list a proposal for a new opcode, OP_PAIRCOMMIT, to be added to the LNHANCE soft fork proposal...
https://bitcoinops.org/en/newsletters/2024/11/22/#update-to-lnhance-proposal

Ethan Heilman posted to the Bitcoin-Dev mailing list the summary of a paper he coauthored with Victor Kolobov, Avihu Levy, and Andrew Poelstra. The paper describes how covenants can be created easily without consensus changes...
https://bitcoinops.org/en/newsletters/2024/11/22/#covenants-based-on-grinding-rather-than-consensus-changes

Changes to services and client software:

- Spark layer two protocol announced
- Unify wallet announced
- bitcoinutils.dev launches
- Great Restored Script Interpreter available
https://bitcoinops.org/en/newsletters/2024/11/22/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Vojtěch Strnad, Moonsettler, Brandon Black, Ethan Heilman, and Dusty Daemon on Twitter Spaces Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1OyKAZQdWWnGb

Bitcoin Optech newsletter #329 is here: - summarizes a new ...

2024-11-15T16:41:52Z

Bitcoin Optech newsletter #329 is here:

- summarizes a new offchain payment resolution protocol
- links to papers about potential IP-layer tracking and censorship of LN payments
- BTCPay Server security fixes
- adds an LN-Penalty topic
- adds a Timeout trees topic
- Optech Newsletter #329 Recap on Twitter Spaces

https://bitcoinops.org/en/newsletters/2024/11/15/

John Law posted to Delving Bitcoin the description of a micropayment protocol that requires both participants to contribute funds to a bond that can be effectively destroyed at any time by either participant...
https://bitcoinops.org/en/newsletters/2024/11/15/#mad-based-offchain-payment-resolution-opr-protocol

Charmaine Ndolo posted to Delving Bitcoin summaries of two recent papers about reducing the privacy of LN payments and potentially censoring them...
https://bitcoinops.org/en/newsletters/2024/11/15/#papers-about-ip-layer-censorship-of-ln-payments

BTCPay Server 2.0.3 and 1.13.7 are maintenance releases that include security critical fixes for users of certain plugins and features...
https://bitcoinops.org/en/newsletters/2024/11/15/#btcpay-server-2-0-3

LN-Penalty is a state protocol that penalizes a party who publishes a past state by allowing their funds to be seized by their counterparty...
https://bitcoinops.org/en/topics/ln-penalty/

Timeout trees are a type of trustless contract protocol that produces a tree of offchain transactions that only remain safe against counterparty theft for a limited period of time (i.e., they time out)...
https://bitcoinops.org/en/topics/timeout-trees/

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 15:30 UTC. Join us to discuss or ask questions!
https://x.com/i/spaces/1lDxLlkMpnvxm

Bitcoin Optech newsletter #327 is here: - describes a proposal ...

2024-11-01T10:51:16Z

Bitcoin Optech newsletter #327 is here:

- describes a proposal for timeout tree channel factories
- summarizes a draft BIP for proofs of discrete log equivalence to be used when generating silent payments
- adds a discrete log equivalency (DLEQ) topic
- adds a duplex micropayment channels topic
- Optech Newsletter #327 Recap on Twitter Spaces

https://bitcoinops.org/en/newsletters/2024/11/01/

ZmnSCPxj posted to Delving Bitcoin and discussed with Optech contributors a proposal for a new multi-layer channel factory design named SuperScalar...
https://bitcoinops.org/en/newsletters/2024/11/01/#timeout-tree-channel-factories

Andrew Toth posted to the Bitcoin-Dev mailing list a draft BIP and a link to an implementation for generating and verifying proofs of discrete log equality (DLEQ) for the elliptic curve used by Bitcoin (secp256k1)...
https://bitcoinops.org/en/newsletters/2024/11/01/#draft-bip-for-dleq-proofs

Discrete log equivalency (DLEQ) or proofs of discrete log equivalency (PODLE) is the ability to prove two points on an elliptic curve were both derived from the same private value (such as a private key)...
https://bitcoinops.org/en/topics/discrete-log-equivalency/

Duplex micropayment channels are bi-directional micropayment channels that use deincrementing relative time locks to ensure the latest state is the first that can be confirmed.
https://bitcoinops.org/en/topics/duplex-micropayment-channels/

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Andrew Toth on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://x.com/i/spaces/1lDxLlkZXaMxm

ZmnSCPxj recently joined Dave Harding and Mike Schmidt in our ...

2024-10-31T16:18:22Z

ZmnSCPxj recently joined Dave Harding and Mike Schmidt in our first Optech Deep Dive podcast episode.

The discussion aimed to provide a deeper understanding of ZmnSCPxj’s SuperScalar proposal in preparation for its coverage in the upcoming Newsletter #327.

Get ahead:
https://bitcoinops.org/en/podcast/2024/10/31/

Bitcoin Core 28.0 includes a number of new P2P and mempool policy ...

2024-10-10T20:09:34Z

Bitcoin Core 28.0 includes a number of new P2P and mempool policy features that may be useful for businesses and users.

In this blog post, Gregory Sanders summarizes the feature set and how they can be used individually or together.

The guide explains and provides command line samples for:

- One Parent One Child (1P1C) Relay
- TRUC Transactions
- 1P1C-topology Package RBF
- Pay To Anchor (P2A)

as well as describing common wallet patterns that can benefit: simple payments, coinjoins, LN, Ark, LN splicing

https://bitcoinops.org/en/bitcoin-core-28-wallet-integration-guide/

Bitcoin Optech newsletter #321 is here: - links to a ...

2024-09-20T10:42:26Z

Bitcoin Optech newsletter #321 is here:

- links to a proof-of-concept implementation for
proving in zero-knowledge that an output is part of the UTXO set
- describes one new and two previous proposals for allowing offline LN
payments
- summarizes research about DNS seeding for non-IP network
addresses
- summarizes changes to services/client software
- Optech Newsletter #321 Recap on Twitter Spaces

https://bitcoinops.org/en/newsletters/2024/09/20/

Johan Halseth posted to Delving Bitcoin to announce a proof-of-concept tool that allows someone to prove that they control one of the outputs in the current UTXO set without revealing which output...
https://bitcoinops.org/en/newsletters/2024/09/20/#proving-utxo-set-inclusion-in-zero-knowledge

Andy Schroder posted to Delving Bitcoin to sketch a communication process an LN wallet could use to generate tokens that could be provided to an internet-connected wallet in order to pay it...
https://bitcoinops.org/en/newsletters/2024/09/20/#ln-offline-payments

Virtu posted to Delving Bitcoin a survey of the availability of seed nodes on anonymity networks and discussed methods for allowing new nodes that exclusively use those networks to learn about peers through DNS seeders...
https://bitcoinops.org/en/newsletters/2024/09/20/#dns-seeding-for-non-ip-addresses

Changes to services and client software:

- Strike adds BOLT12 support
- BitBox02 adds silent payment support
- The Mempool Open Source Project v3.0.0 released
- ZEUS v0.9.0 released
- Live Wallet adds consolidation support
- Bisq adds Lightning support
https://bitcoinops.org/en/newsletters/2024/09/20/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1RDGlywwRREJL

Bitcoin Optech newsletter #320 is here: - announces a new testing ...

2024-09-13T11:46:48Z

Bitcoin Optech newsletter #320 is here:

- announces a new testing tool for Bitcoin Core
- briefly describes a DLC-based loan contract
- recaps the "Testing Bitcoin Core 28.0 Release Candidates" PR Review Meeting
- Optech Newsletter #320 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/09/13/

Bruno Garcia posted to Delving Bitcoin to announce a tool that would automatically modify (mutate) code changed in a PR or commit to determine whether the mutations cause existing tests to fail...
https://bitcoinops.org/en/newsletters/2024/09/13/

Shehzan Maredia posted to Delving Bitcoin to announce Lava Loans, a loan contract that uses DLC oracles for price discovery of bitcoin-collateralized loans...
https://bitcoinops.org/en/newsletters/2024/09/13/

Testing Bitcoin Core 28.0 Release Candidates was a review club meeting that did not review a particular PR, but rather was a group testing effort...
https://bitcoinops.org/en/newsletters/2024/09/13/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Bruno Garcia and Shehzan Maredia on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1rmGPoEBwvZKN

Bitcoin Optech newsletter #319 is here: - summarizes a proposal ...

2024-09-06T10:23:12Z

Bitcoin Optech newsletter #319 is here:

- summarizes a proposal for allowing Stratum v2 pool miners to receive compensation for the transaction fees contained in the block templates they turn into shares
- announces a research fund investigating the proposed OP_CAT opcode
- describes a discussion about mitigating merkle tree vulnerabilities with or without a soft fork
- Bitcoin Core 28.0rc1
- Core Lightning 24.08
- Optech Newsletter #319 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/09/06/

Filippo Merli posted to Delving Bitcoin about an extension to Stratum v2 that will allow tracking the amount of fees included in shares when the shares contain transactions selected by an individual miner...
https://bitcoinops.org/en/newsletters/2024/09/06/#stratum-v2-extension-for-fee-revenue-sharing

Victor Kolobov posted to the Bitcoin-Dev mailing list to announce a $1 million fund for research into a proposed soft fork to add an OP_CAT opcode...
https://bitcoinops.org/en/newsletters/2024/09/06/#op-cat-research-fund

Eric Voskuil posted to the Delving Bitcoin discussion thread about the consensus cleanup soft fork proposal a request for an update given recent discussion on the Bitcoin-Dev mailing list. In particular, he saw “no justification for the proposed invalidation of 64 byte transactions”...
https://bitcoinops.org/en/newsletters/2024/09/06/#mitigating-merkle-tree-vulnerabilities

Bitcoin Core 28.0rc1 is a release candidate for the next major version of the predominant full node implementation. A testing guide is available...
https://github.com/bitcoin-core/bitcoin-devwiki/wiki/28.0-Release-Candidate-Testing-Guide

Core Lightning 24.08 is a major release of this popular LN node implementation containing new features and bug fixes.
https://bitcoinops.org/en/newsletters/2024/09/06/#core-lightning-24-08

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Filippo Merli on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1rmxPoBjMRVJN

Bitcoin Optech newsletter #317 is here: - summarizes discussion ...

2024-08-23T12:10:45Z

Bitcoin Optech newsletter #317 is here:

- summarizes discussion about an anti-exfiltration protocol that only requires one round trip of communication between a wallet and a signing device
- summarizes changes to services/client software
- Optech Newsletter #317 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/08/23/

Moonsettler posted to Delving Bitcoin to describe an anti-exfiltration protocol. The protocol uses the sign-to-contract protocol to allow a software wallet to contribute entropy to the nonce selected by a hardware signing device in a way that allows the software wallet to later verify the entropy was used...
https://bitcoinops.org/en/newsletters/2024/08/23/#simple-but-imperfect-anti-exfiltration-protocol

Changes to services and client software:

- Proton Wallet announced
- CPUNet testnet announced
- Lightning.Pub launches
- Taproot Assets v0.4.0-alpha released
- Stratum v2 benchmarking tool released
- STARK verification PoC on signet
- SeedSigner 0.8.0 released
- Floresta 0.6.0 released
https://bitcoinops.org/en/newsletters/2024/08/23/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1LyGBgmeNjkJN

Bitcoin Optech newsletter #316 is here: - describes a new time ...

2024-08-16T10:55:36Z

Bitcoin Optech newsletter #316 is here:

- describes a new time warp that’s particularly consequential for the new testnet4
- summarizes proposed mitigations for onion message denial-of-service concerns
- seeks feedback on a proposal to allow LN payers to identify themselves
- announces a major change to Bitcoin Core’s build system that could affect developers and integrators
- adds Inbound forwarding fees, Merkle tree vulnerabilities topics
- Optech #316 Recap
https://bitcoinops.org/en/newsletters/2024/08/16/

Mark “Murch” Erhardt posted to Delving Bitcoin to describe an attack discovered by developer Zawy for exploiting testnet4’s new difficulty adjustment algorithm...
https://bitcoinops.org/en/newsletters/2024/08/16/#new-time-warp-vulnerability-in-testnet4

Gijs van Dam posted to Delving Bitcoin to discuss a recent paper by researchers Amin Bashiri and Majid Khabbazian about onion messages...
https://bitcoinops.org/en/newsletters/2024/08/16/#onion-message-dos-risk-discussion

Bastien Teinturier posted to Delving Bitcoin to propose methods for allowing spenders to optionally include extra data with their payments that would allow receivers to identify those payments as having come from a known contact...
https://bitcoinops.org/en/newsletters/2024/08/16/#optional-identification-and-authentication-of-ln-payers

Cory Fields posted to the Bitcoin-Dev mailing list to announce Bitcoin Core’s impending switch from the GNU autotools build system to the CMake build system...
https://bitcoinops.org/en/newsletters/2024/08/16/#bitcoin-core-switch-to-cmake-build-system

Inbound forwarding fees are fees charged by an LN node for accepting a payment for forwarding. The original LN protocol only specifies charging forwarding fees when a node relays the payment to its next hop...
https://bitcoinops.org/en/topics/inbound-forwarding-fees/

Merkle tree vulnerabilities are a class of problems in the design of the merkle tree used by the Bitcoin consensus protocol...
https://bitcoinops.org/en/topics/merkle-tree-vulnerabilities/

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Bastien Teinturier on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1vOGwrmXkNLKB

Bitcoin Optech newsletter #314 is here: - announces the ...

2024-08-02T11:19:24Z

Bitcoin Optech newsletter #314 is here:

- announces the disclosure of two vulnerabilities affecting older versions of Bitcoin Core
- summarizes a proposed approach to optimizing miner transaction selection when cluster mempool is in use
- highlights a network event simulator for the Bitcoin P2P network
- Optech Newsletter #314 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/08/02/

Niklas Gögge posted to the Bitcoin-Dev mailing list a link to announcements of two vulnerabilities affecting versions of Bitcoin Core that have been past their end of life since at least October 2022...
https://bitcoinops.org/en/newsletters/2024/08/02/#disclosure-of-vulnerabilities-affecting-bitcoin-core-versions-before-0-21-0

Pieter Wuille posted to Delving Bitcoin about ensuring that miner block templates can include the best set of transactions when using cluster mempool...
https://bitcoinops.org/en/newsletters/2024/08/02/#optimizing-block-building-with-cluster-mempool

Sergi Delgado posted to Delving Bitcoin about Hyperion, a network simulator he’s written that tracks how data propagates through a simulated Bitcoin network...
https://bitcoinops.org/en/newsletters/2024/08/02/#hyperion-network-event-simulator-for-the-bitcoin-p2p-network

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1ynJODgpgawxR

Bitcoin Optech newsletter #309 is here: - summarizes research ...

2024-06-28T12:06:37Z

Bitcoin Optech newsletter #309 is here:

- summarizes research into estimating the likelihood that an LN payment is feasible
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #309 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/06/28/

René Pickhardt posted to Delving Bitcoin about estimating the likelihood that an LN payment is feasible given the public knowledge of a channel’s maximum capacity but no knowledge about its current balance distribution...
https://bitcoinops.org/en/newsletters/2024/06/28/#estimating-the-likelihood-that-an-ln-payment-is-feasible

Selected Q&A from Bitcoin Stack Exchange:

- How is the progress IBD calculated?
- What is progress increase per hour during synchronization?
- Should an even Y coordinate be enforced after every key-tweak operation, or only at the end?
- Signet mobile phone wallets?
- What block had the most transaction fees?
- bitcoin-cli listtransactions fee amount is way off, why?
- Did uncompressed public keys use the 04 prefix before compressed public keys were used?
- What happens if an HTLC’s value is below the dust limit?
- How does subtractfeefrom work?
- What’s the difference between the 3 index directories “blocks/index/”, “bitcoin/indexes” and “chainstate”?
https://bitcoinops.org/en/newsletters/2024/06/28/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest René Pickhardt on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://x.com/i/spaces/1MYGNowQanbJw

Bitcoin Optech newsletter #308 is here: - announces the ...

2024-06-21T11:40:34Z

Bitcoin Optech newsletter #308 is here:

- announces the disclosure of a vulnerability affecting old versions of LND
- summarizes continued discussion about PSBTs for silent payments
- summarizes changes to services/client software
- Optech Newsletter #308 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/06/21/

Matt Morehouse posted to Delving Bitcoin the disclosure of a vulnerability affecting versions of LND before 0.17.0...
https://bitcoinops.org/en/newsletters/2024/06/21/#disclosure-of-vulnerability-affecting-old-versions-of-lnd

Several developers have been discussing adding support for coordinating the sending of silent payments using PSBTs. Since our previous summary, the discussion has focused on using a technique where each signer generates an ECDH share and a compact proof that they generated their share correctly...
https://bitcoinops.org/en/newsletters/2024/06/21/#continued-discussion-of-psbts-for-silent-payments

Changes to services and client software:

- Casa adds descriptor support
- Specter-DIY v1.9.0 released
- Constant-time analysis tool cargo-checkct announced
- Jade adds miniscript support
- Ark implementation announced
- Volt Wallet beta announced
- Joinstr adds electrum support
- Bitkit v1.0.1 released
- Civkit alpha announced
https://bitcoinops.org/en/newsletters/2024/06/21/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://x.com/i/spaces/1PlKQDbRlQvxE

Bitcoin Optech newsletter #307 is here: - announces a draft BIP ...

2024-06-14T08:58:57Z

Bitcoin Optech newsletter #307 is here:

- announces a draft BIP for a quantum-safe Bitcoin address format
- recaps the "Don’t wipe indexes again when continuing a prior reindex" PR Review Meeting
- Optech Newsletter #307 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/06/14/

Developer Hunter Beast posted to both Delving Bitcoin and the mailing list a “rough draft” BIP for assigning version 3 segwit addresses to a quantum-resistant signature algorithm...
https://bitcoinops.org/en/newsletters/2024/06/14/#draft-bip-for-quantum-safe-address-format

'Don’t wipe indexes again when continuing a prior reindex' is a PR by TheCharlatan that can improve startup time when a user restarts their node before an ongoing reindex has completed...
https://bitcoinops.org/en/newsletters/2024/06/14/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Hunter Beast on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1MnGnMpMVyMKO

Bitcoin Optech newsletter #306 is here: - announces upcoming ...

2024-06-07T12:04:06Z

Bitcoin Optech newsletter #306 is here:

- announces upcoming disclosure of vulnerabilities affecting older versions of Bitcoin Core
- describes a BIP for a new testnet
- summarizes a proposal for covenants based on functional encryption
- examines an update to the 64-bit arithmetic proposal
- links to a script for validating proof-of-work on signet with the OP_CAT opcode
- looks at a proposed update to the BIP21 specification of bitcoin: URIs
- #306 Recap
https://bitcoinops.org/en/newsletters/2024/06/07/

Several members of the Bitcoin Core project discussed on IRC a proposed policy for disclosing vulnerabilities that affected older versions of Bitcoin Core...
https://bitcoinops.org/en/newsletters/2024/06/07/#upcoming-disclosure-of-vulnerabilities-affecting-old-versions-of-bitcoin-core

Fabian Jahr posted to the Bitcoin-Dev mailing list to announce a draft BIP for testnet4, a new version of testnet designed to eliminate some problems with the existing testnet3...
https://bitcoinops.org/en/newsletters/2024/06/07/#bip-and-experimental-implementation-of-testnet4

Jeremy Rubin posted to Delving Bitcoin his paper about theoretically using functional encryption to add a full range of covenant behavior to Bitcoin with no required consensus changes...
https://bitcoinops.org/en/newsletters/2024/06/07/#functional-encryption-covenants

Chris Stewart posted to Delving Bitcoin to announce an update to his earlier proposal to add the ability to work with 64-bit numbers in Bitcoin Script...
https://bitcoinops.org/en/newsletters/2024/06/07/#updates-to-proposed-soft-fork-for-64-bit-arithmetic

Anthony Towns posted to Delving Bitcoin about a script for signet that uses OP_CAT to allow anyone to spend coins sent to the script using proof of work (PoW). This can be used as a decentralized signet-bitcoin faucet...
https://bitcoinops.org/en/newsletters/2024/06/07/#op-cat-script-to-validate-proof-of-work

Matt Corallo posted to the Bitcoin-Dev mailing list about updating the BIP21 specification for the bitcoin: URI...
https://bitcoinops.org/en/newsletters/2024/06/07/#proposed-update-to-bip21

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1OdJrjBLWXkJX

Bitcoin Optech newsletter #305 is here: - describes a proposed ...

2024-05-31T11:30:37Z

Bitcoin Optech newsletter #305 is here:

- describes a proposed light client protocol for silent payments
- summarizes two new proposed descriptors for taproot
- links to a discussion about whether opcodes with overlapping features should be added in a soft fork
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #305 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/05/31/

Setor Blagogee posted to Delving Bitcoin to describe a draft specification for a protocol to help lightweight clients receive silent payments (SPs)...
https://bitcoinops.org/en/newsletters/2024/05/31/#light-client-protocol-for-silent-payments

Oghenovo Usiwoma posted to Delving Bitcoin about two new proposed descriptors for constructing taproot spend conditions...
https://bitcoinops.org/en/newsletters/2024/05/31/#raw-taproot-descriptors

Pierre Rochard asks if proposed soft forks that can provide much of the same features at a similar cost should be considered mutually exclusive, or whether it would make sense to activate multiple proposals and let developers use whichever alternative they prefer...
https://bitcoinops.org/en/newsletters/2024/05/31/#should-overlapping-soft-fork-proposals-be-considered-mutually-exclusive

Selected Q&A from Bitcoin Stack Exchange:

- What’s the smallest possible coinbase tx / block size?
- Understanding Script’s number encoding, CScriptNum
- Is there a way to make an address public but hide how many BTC it contains?
- Testing increased feerates in regtest
- Why is my P2P_V2 peer connected over a v1 connection?
- Does a P2PKH tx send to the hash of the uncompressed or compressed key?
- What are different ways to broadcast a block to the Bitcoin network?
https://bitcoinops.org/en/newsletters/2024/05/31/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Oghenovo Usiwoma and Pierre Rochard on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1eaKbgnYgOBGX

Bitcoin Optech newsletter #303 is here: - summarizes a new scheme ...

2024-05-17T10:42:19Z

Bitcoin Optech newsletter #303 is here:

- summarizes a new scheme for anonymous usage tokens that could be used for LN channel announcements and other sybil-resistant coordination protocols
- links to discussion about a new BIP39 seed phrase splitting scheme
- announces an alternative to BitVM for verifying successful execution of arbitrary programs in interactive contract protocols
- relays suggestions for updating the BIPs process
- Optech Newsletter #303 Recap
https://bitcoinops.org/en/newsletters/2024/05/17/

Adam Gibson posted to Delving Bitcoin about a scheme he has developed to allow anyone who can keypath-spend a UTXO to prove they could spend it without revealing which UTXO it is...
https://bitcoinops.org/en/newsletters/2024/05/17/#anonymous-usage-tokens

Rama Gan posted to the Bitcoin-Dev mailing list a link to a set of tools they have developed for generating and splitting a BIP39 seed phrase without using any electronic computing equipment...
https://bitcoinops.org/en/newsletters/2024/05/17/#bip39-seed-phrase-splitting

Sergio Demian Lerner and several co-authors posted to the Bitcoin-Dev mailing list about a new virtual CPU architecture based in part on the ideas behind BitVM. The goal of their project, BitVMX, is to be able to efficiently prove the proper execution of any program that can be compiled to run on an established CPU architecture, such as RISC-V...
https://bitcoinops.org/en/newsletters/2024/05/17/#alternative-to-bitvm

Mark “Murch” Erhardt continued the discussion on the Bitcoin-Dev mailing list about updating BIP2, which is the document that currently describes the Bitcoin improvement proposals (BIP) process...
https://bitcoinops.org/en/newsletters/2024/05/17/#continued-discussion-about-updating-bip2

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday (note the day change) at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1MnxnMQOdOYJO

Bitcoin Optech newsletter #301 is here: - describes an idea for ...

2024-05-08T11:22:35Z

Bitcoin Optech newsletter #301 is here:

- describes an idea for securing transactions with lamport signatures without requiring any consensus changes
- recaps the "Index TxOrphanage by wtxid, allow entries with same txid" PR Review Meeting
- Optech Newsletter #301 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/05/08/

Ethan Heilman posted to the Bitcoin-Dev mailing list a method for requiring that a transaction be signed by a lamport signature in order to be valid...
https://bitcoinops.org/en/newsletters/2024/05/08/#consensus-enforced-lamport-signatures-on-top-of-ecdsa-signatures

Index TxOrphanage by wtxid, allow entries with same txid is a PR by Gloria Zhao that allows multiple transactions with the same txid to exist in TxOrphanage at the same time by indexing them on wtxid instead of txid...
https://bitcoinops.org/en/newsletters/2024/05/08/#bitcoin-core-pr-review-club

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Ethan Heilman and Gloria Zhao on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1RDGllvgewVGL

Bitcoin Optech newsletter #300 is here: - summarizes a CTV-like ...

2024-05-01T10:22:43Z

Bitcoin Optech newsletter #300 is here:

- summarizes a CTV-like proposal that uses commitments embedded in public keys
- examines the analysis of a contract protocol with Alloy
- announces the arrests of Bitcoin developers
- links to summaries of a CoreDev.tech developer meetup
- Optech Newsletter #300 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/05/01/

Tadge Dryja posted to Delving Bitcoin a proposal for a slightly more efficient version of the core idea of OP_CHECKTEMPLATEVERIFY (CTV)...
https://bitcoinops.org/en/newsletters/2024/05/01/#ctv-like-exploding-keys-proposal

Dmitry Petukhov posted to Delving Bitcoin a specification he had created using the Alloy specification language for the simple OP_CAT-based vault. Petukhov used Alloy to find several useful modifications and to highlight important constraints that any potential implementors should observe...
https://bitcoinops.org/en/newsletters/2024/05/01/#analyzing-a-contract-protocol-with-alloy

As widely reported elsewhere, two developers of the Samourai privacy-enhanced Bitcoin wallet were arrested last week in relation to their software, based on charges by U.S. law enforcement...
https://bitcoinops.org/en/newsletters/2024/05/01/#arrests-of-bitcoin-developers

Many Bitcoin Core contributors met in person for a periodic CoreDev.tech event last month in Berlin. Transcripts for some of the sessions from the event have been provided by attendees...
https://bitcoinops.org/en/newsletters/2024/05/01/#coredev-tech-berlin-event

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Tadge Dryja on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1LyxBnyAnnjxN

Bitcoin Optech newsletter #298 is here: - summarizes an analysis ...

2024-04-17T09:35:29Z

Bitcoin Optech newsletter #298 is here:

- summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in 2023
- Bitcoin Core 27.0 release
- summarizes changes to services/client software
- Optech Newsletter #298 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/04/17/

Suhas Daftuar posted to Delving Bitcoin that he recorded every transaction his node received in 2023 and has now run them through a development version of Bitcoin Core with cluster mempool enabled to quantify differences between the existing version and the development version...
https://bitcoinops.org/en/newsletters/2024/04/17/#what-would-have-happened-if-cluster-mempool-had-been-deployed-a-year-ago

Changes to services and client software:

- Phoenix for server announced
- Mercury Layer adds Lightning swaps
- Stratum V2 Reference Implementation v1.0.0 released
- Teleport Transactions update
- Bitcoin Keeper v1.2.1 released
- BIP-329 label management software
- Key agent Sigbash launches
https://bitcoinops.org/en/newsletters/2024/04/17/#changes-to-services-and-client-software

Bitcoin Core 27.0 is the release of the next major version of the network’s predominant full node implementation...
https://bitcoinops.org/en/newsletters/2024/04/17/#bitcoin-core-27-0

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1OyJAWNAezaKb

Bitcoin Optech newsletter #296 is here: - summarizes discussion ...

2024-04-03T12:42:17Z

Bitcoin Optech newsletter #296 is here:

- summarizes discussion about a new push for a consensus cleanup soft fork
- announces a plan to choose additional BIP editors
- adds an accidental confiscation topic
- adds a duplicate transactions topic
- adds a gap limit topic
- adds a time warp topic
- Optech Newsletter #296 Recap on Twitter Spaces
https://bitcoinops.org/en/newsletters/2024/04/03/

Antoine Poinsot posted to Delving Bitcoin about revisiting Matt Corallo’s consensus cleanup proposal from 2019...
https://bitcoinops.org/en/newsletters/2024/04/03/#revisiting-consensus-cleanup

Mark “Murch” Erhardt continued the thread about adding new BIP editors by proposing everyone express “their arguments for and against any candidates in this thread until Friday end-of-day (April 5th)...
https://bitcoinops.org/en/newsletters/2024/04/03/#choosing-new-bip-editors

Accidental confiscation can occur if a poorly designed soft fork permanently prevents a user from being able to get a transaction confirmed...
https://bitcoinops.org/en/topics/accidental-confiscation/

Duplicate transactions are more than one transaction that are identical and have identical txids. Bitcoin’s consensus rules use txids to uniquely identify transactions, so duplicate transactions can cause unwanted behavior...
https://bitcoinops.org/en/topics/duplicate-transactions/

Gap limits are the limits wallets set for how many addresses they’ll derive from an HD wallet without seeing any transactions related to those addresses...
https://bitcoinops.org/en/topics/gap-limits/

Time warp is an exploit of Bitcoin’s difficulty adjustment algorithm that allows miners controlling a large amount of hashrate to prevent difficulty from increasing even as the rate of block production increases...
https://bitcoinops.org/en/topics/time-warp/

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Antoine Poinsot on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions!
https://twitter.com/i/spaces/1vOxwjOPWrdJB?s=20