mattcrv
Matt Carvalho

chronicling the products layered upon the bitcoin protocol. dying on the crypto(graphy)-abolitionism hill.

Public Key

npub1sedkh5uwyfypc3vfh39svzsvpnqnqnaae2dquvug6s5zm29msw3qxsekcj

NIP-05 Address

me.mattcrv.com

Profile Code

nprofile1qqsgvkmt6w8zyjqugkymcjcxpgxqesfsf77u4xswxwydg2pd4zac8gspz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsx43pz9

Publishing to

relay.damus.io

nos.lol

Author Public Key

npub1sedkh5uwyfypc3vfh39svzsvpnqnqnaae2dquvug6s5zm29msw3qxsekcj

Show more details

Last Notes

2026-01-03 21:19:38 UTC

Jan 3,
2009: $0
2010: $0
2011: $0
2012: $5
2013: $13
2014: $803
2015: $315
2016: $434
2017: $1,020
2018: $15,083
2019: $3,792
2020: $7,335
2021: $32,995
2022: $46,429
2023: $16,670
2024: $42,865
2025: $96,732
2026: $90,113

2025-11-08 17:56:09 UTC

All Bitcoin conferences should follow @nprofile…vqyk’s example: no fiat payments allowed.
https://blossom.primal.net/4939ddfc05e99d68568517981e138b69467dce60d25e29372a8a993ff4c4f1d2.jpg

2025-01-23 21:10:09 UTC

Boe Jiden's Executive Order 14067 placed "the highest urgency on research and development [...] of a United States CBDC."
Donald just revoked it and prohibited CBDCs. This seems to be the only news worth BREAKING. 🗞️
https://m.primal.net/NwtV.png

2024-12-05 03:20:45 UTC

Sat/Cent parity achieved! Now, 0.00000001 BTC is worth more than $0.01. 🪙
https://m.primal.net/Mnux.png

2024-12-05 03:15:40 UTC

Buy the dip! Bitcoin won’t stay this cheap for long
https://m.primal.net/Mnul.png

2024-11-27 23:27:52 UTC

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appreciate the transparency. it's reassuring to know that refurbished devices won’t be reshipped

2024-11-27 23:24:13 UTC

Data breach alert: 250,000 Brazilians' IDs, credit card details, and bank statements leaked from 7 financial institutions. 🇧🇷
KYC is the illicit activity. 🪪
https://m.primal.net/MixI.png

2024-11-23 19:54:55 UTC

Kendrick dropping Bitcoin bars on his new album is bullish 🐂
Drake bribing snitches in Bitcoin is bearish 🤡
https://m.primal.net/MfSy.jpg

2024-11-15 12:56:13 UTC

Thrilled to see Bitkey rolling out new on-ramps with transparent pricing! I didn’t expect them to go beyond CashApp. 🎢
https://m.primal.net/MDur.png
https://m.primal.net/MDut.png

2024-11-14 23:46:27 UTC

cool to see more wallets embracing timelocks
h/t @npub1s0k…zcfm
https://m.primal.net/MDWY.png

2024-09-19 03:46:52 UTC

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Curioso pelo que está por vir. Se adicionassem features que justifiquem o aumento de preço, eu consideraria voltar.

2024-09-19 03:45:18 UTC

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Not available outside the US, unfortunately

2024-09-18 14:05:41 UTC

Closing my Xapo account today.
It served me well for over an year.
Now seeking a Bitcoin-friendly fiat bank that:
🥾 Doesn't hike prices by 567% without offering anything new
🤹‍♂️ Prioritizes core services over yield gimmicks
https://m.primal.net/KtrA.png

2024-09-17 23:07:26 UTC

Taxation is theft, and using Bitcoin as a Medium of Exchange is self-defense.

2024-09-17 12:43:53 UTC

Excited about @npub19yf…mc68's Bitcoin-backed credit card! 💳
Locking collateral in a multisig escrow lowers risk for lenders and slashes interest rates.
Spend without selling. Perfect for holders who live on the Bitcoin standard and need a bridge to the fiat world.
https://m.primal.net/Ksii.png

2024-09-16 18:56:58 UTC

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He mistakenly selected SIGHASH_NONE when broadcasting his transaction.
This allows anyone to RBF his transaction and change the outputs.
A bot that steals inscriptions replaced his transaction and burned 0.79 BTC to mining fees.
Sparrow now has a warning, but IMO this options shouldn't even be clickable for single input transactions:
https://github.com/sparrowwallet/sparrow/commit/8d7308bc37fbf957c32fd9756086b35d9585740e

2024-09-16 18:43:47 UTC

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💯. And that dangerous shit shouldn't be clickable!
https://github.com/sparrowwallet/sparrow/commit/8d7308bc37fbf957c32fd9756086b35d9585740e

2024-09-16 18:33:05 UTC

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People fear sophisticated hacks and overlook simple risks like SIM swaps and social engineering.
North Korea likely isn't targeting your Bitcoin, but a Minecraft teen might be. ⛏️
Props to @npub1cas…tzdc for zooming out of zero-day attacks and zeroing in on everyday threats.
#note1atl…n3kw

2024-09-16 13:21:46 UTC

Someone recently lost 0.8 BTC after stepping on an option Sparrow probably shouldn't even have exposed.
https://m.primal.net/Krmc.png
Footguns everywhere. Tread lightly! 💣
https://m.primal.net/Krmd.png

2024-08-21 13:12:34 UTC

reading this headline gave me headache
https://m.primal.net/KGey.jpg

2024-06-22 16:21:50 UTC

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Awesome that you liked them! Once barefoot, it’s hard to go back to regular shoes 👣
Vivo and other brands sell models for winter: https://www.vivobarefoot.com/

2024-06-20 15:21:28 UTC

I just set up my @npub1tft…xar5 Vault, and the user experience was incredibly smooth! 🔐
Using Bitcoin-only hardware wallets like the @npub1jg5…6n8n Jade makes multisig so much easier.
You don't even need to install companion apps like Trezor Suite or Ledger Live.
https://image.nostr.build/2b10f463307db532d1b62b9dd4d670de2b6bacf940f332bd5211cc831219e02c.png

2024-05-31 18:47:49 UTC

Days ago, Mt.Gox transferred 141,686 BTC in preparation for the upcoming distribution.
Today, a Japanese exchange loses 4,503 BTC.
Full circle.
https://m.primal.net/IUIo.png

2024-04-22 13:28:03 UTC

When @npub1jg5…6n8n Green upgraded from nLockTime to CheckSequenceVerify, users didn't care about adopting a new OP_CODE.
They cared about no longer needing to back up pre-signed transactions.
When wallets add support to covenants, most users won't care if it's CTV, CCV, or CAT...

2024-04-17 13:59:05 UTC

Finally got my COLDCARD Q!
This calculator is thicc 🥵
Excited to try it out!
Tks @npub1az9…m8y8 @npub1zeq…m6xm https://image.nostr.build/7c649938455c50d07e02b83e353b845eee6008b17f4f376c9168b02a4e34c2a0.jpg

2024-04-12 13:41:38 UTC

Introducing the Humane Bitcoin Wallet ✨
Hardware wallets should feel more human:
🗣️ Read your seed phrase out loud
👕 Pin your life savings to your shirt
🤖 Select and label UTXOs with your voice
🤌 Verify transactions with your bare hands
Not your pin, not your coins! https://image.nostr.build/86f505b1c0e8d7730dfbdc89b34b91b040aec6fbdd024a51c06f27770f417d23.png

2024-03-26 17:31:31 UTC

every time a mobile wallet asks you to back up 24 words instead of 12, a honey badger dies 🦡

2024-03-25 19:38:24 UTC

Bolt Cards on the Google or Apple Wallet would be dope https://image.nostr.build/30be2d084f528fded53ac70ad7365a53151e6043ba4ec8351dfc1b2e5bc12142.jpg

2024-03-25 17:18:29 UTC

LEAKED 🚨 Here's a prototype of the upcoming @npub1tcn…ctu0 Lite: https://image.nostr.build/07481f0141a283efc331b9ee3e9905fb7caeae4d3449b83fe7476501f1593636.jpg

2024-03-25 12:23:05 UTC

Hardware wallets are getting heavier ⚖️
2014: Trezor One → 12g
2016: Ledger Nano S → 16g
2018: Trezor Model T → 22g
2019: Ledger Nano X → 34g
2023: Ledger Stax → 45g
2024: Bitkey → 65g
2024: COLDCARD Q → 93g (w/o 🔋🔋)

2024-03-24 17:54:06 UTC

Beware of security nihilism when reacting to @npub1tcn…ctu0 .
@npub1xyd…n6n2 raised a valid point when introducing his 2-of-2 seedless cloud backup scheme: https://image.nostr.build/7885c4207d586229b1f7d37556b90d7ee95e4f6672cf52dffc0966f7562865d2.jpg

2024-03-16 14:29:35 UTC

Funny how 24-word seed phrases feel safer than 12.
(probably a cognitive bias 🧠)
Doubling the word count offers no real advantage. 🤷‍♂️
And it's twice as cumbersome to backup.
12 is enough, don't waste your time with 24.

2024-03-15 20:23:04 UTC

It's been nearly a year since MicroStrategy announced their Lightning Platform with rewards and more. Haven't heard any updates since. Does anyone know if they're still working on it?
https://m.primal.net/HlPJ.png

2024-03-11 18:34:14 UTC

@npub1864…t2tq launched a leaderboard ranking countries by merchant adoption. Cool to see Brazil 🇧🇷 at the top!
https://m.primal.net/Hjru.png
Check it out: https://btcmap.org/countries/leaderboard

2024-03-10 14:25:06 UTC

Bitcoin is for enemies.
Bitcoin is for people like Nayib Bukele.

2024-03-08 19:24:07 UTC

One day, our great-grandchildren will hear stories about the fiat era.
They'll study history through our memes.
They'll question why humanity tolerated central banks for so long.
They will own everything and be happy. 🥹

2024-03-07 20:06:47 UTC

Nov 2023 - @npub137l…kxgf & @npub1wvu…mtwm raised a $7.5M seed round for Taproot Wizards
Feb 2024 - Sold 3,000 Quantum Cats for 0.1 BTC each
Mar 2024 - 300 BTC = $20.3M
https://m.primal.net/Higt.png

2024-03-07 10:46:10 UTC

the world if women understood that men also get mansplained by other men https://image.nostr.build/95ea5292e9aca59fd93aaac528f7381b35e67077967380e66a319888068b5024.jpg

2024-03-06 19:31:34 UTC

the best affiliate program for bitcoin creators is owning bitcoin

2024-03-06 14:16:55 UTC

fix email spam... fix the world

2024-03-05 20:25:33 UTC

I was today years old when I learned that hovering over "Taproot" on @npub18d4…6lt3 shows this:
https://m.primal.net/HiAV.png

2024-03-03 13:53:19 UTC

We need more opinionated Bitcoin products like TwentyTwo's Portal.
Don't overwhelm users with a million choices on how to use your product.
Enabling people to do everything diminishes the UX for everyone.
Most products should guide their users, not the other way around.
https://www.youtube.com/watch?v=9384E3dTsdc

2024-03-02 19:43:00 UTC

It's curious to see how hardware tradeoffs affect UX.
@npub1jg5…6n8n's Jade has one select button and a jog wheel, leading them to place the delete key ⌫ in an unusual (but surprisingly intuitive) spot in the recovery flow ↓ https://image.nostr.build/4bce66e237982bc0626d473581c5d7eb6f77659f993b8300c581eae3f8348d9b.jpg

2024-02-29 16:32:54 UTC

Would you trust a wallet that DOESN'T allow you to back up your seed phrase? There are no mnemonics on Bitkey, the wallet made by @npub1sg6…f63m's team 👇
https://youtube.com/shorts/zvY2HgxAeqs

2024-02-28 13:38:57 UTC

Forget the $60k, the US dollar is close to an All-Time Low! Now ₿1661 can buy $1. It's getting early in Moscow! 🌅
https://m.primal.net/HftI.png

2024-02-27 19:50:18 UTC

everyone is fixated on the Number Going Up, but it's more fun to watch this Number Go Down 👇
https://m.primal.net/Hfhm.png

2024-02-27 01:18:57 UTC

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i've sent you a DM

2024-02-26 17:48:47 UTC

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Check your DMs!

2024-02-26 15:49:21 UTC

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You can also join the federation on @npub1mut…23vg!
After the federation dissolves at the end of @npub1h49…4cwz, you can tap 🔀 to melt your ecash and go self-custodial (as long as you have a minimum of ₿100 000).
https://m.primal.net/HfPZ.jpg
#note17x8…hgyy

2024-02-26 15:17:44 UTC

@npub1h49…4cwz has just launched its Fedimint federation in partnership with @npub1uq7…u0c2. Pretty cool!
https://m.primal.net/HfPK.jpg
I especially like the feature that allows canceling payments sent to federation members.
https://m.primal.net/HfPM.png

2024-02-26 15:14:51 UTC

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cool, excited for that!

2024-02-26 11:14:49 UTC

hey @npub1mhc…c226, I'm loving my mattcrv@npub.cash, congrats!
is there a way I could set up to receive the ecash notes via DM? Or at least get notified via DM when there are notes to be claimed?

2024-02-24 23:47:58 UTC

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yeah, paying customs duty sucks.
the UX feels very polished. i'd feel comfortable gifting it to family members without worrying that they'll make a mistake and accidentally lose their BTC.
but I'm not a fan of the fact that 2/3 of the keys are hot. the hacker who manages to breach Block's HSM could also release a malicious app update

2024-02-24 14:06:22 UTC

Here's an unboxing of @npub1tcn…ctu0, the wallet built by @npub1sg6…f63m's team at Block:
https://www.youtube.com/shorts/98Kmgz7MPrQ

2024-02-23 19:29:21 UTC

Are there other exchanges doing this?
Xapohttps://m.primal.net/HejE.png charges a fee for deposits of less than 0.0007 BTC (~$36).
That's reasonable considering how expensive it is for them to consolidate those UTinyXOs.

2024-02-23 16:31:10 UTC

Do you agree with @npub1lh2…a9nk that APIs to submit out-of-band transactions directly to pools are an attack?
If yes, you have 2 options:
1. Run Libre Relay to propagate non-std txs and render Marathon's Slipstream obsolete.
2. Try to change consensus.
Complaining will only expose your lack of understanding of the incentives at play.

2024-02-22 18:10:18 UTC

Bitcoin is NOT for everyone.
It's only for those who can afford on-chain fees.

2024-02-18 15:15:30 UTC

Many criticize @npub18m4…cl2x' decision to promote UMA instead of "an off-the-shelf
LNURL implementation with an LUD-18-based compliance and LUD-21".
I think it’s perfectly logical.
Lightspark is targeting VASPs that want to provide a cheap, compliant and instant FX solution to their users.
Those institutions don't care if what's under the hood is LNURL or something else.
If they cared, they'd have implemented LNURL already — the building blocks have been around for years.

2024-02-15 15:47:48 UTC

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This was fun! Check out the conversation between me, @npub1vt8…sdlw, @npub1kuc…0eyw, @npub1shh…56zk, and more: https://www.youtube.com/watch?v=UyDGfFboHPw
#note16gf…auyk

2024-02-14 22:29:46 UTC

dang, @npub1ex7…vyt9 has some fierce competition for ranking in the app stores
https://m.primal.net/Hctq.png

2024-02-13 18:38:31 UTC

The biggest threat that will attract regulatory scrutiny to Bitcoin isn't covenants, Taproot Assets, Lightspark's UMA, or any of Bitcoin Twitter's villain of the week. It's adoption. More bitcoiners, more regulators' eyeballs. 🤷‍♂️

2024-02-12 17:17:19 UTC

I've just found out @npub18m4…cl2x is on Nubank's board. Onboarding 90M+ Latin Americans to Lightspark's UMA would be neat! 👌
Nubank's remittances offering is weak, they already sell bitcoin via Paxos, and Revolut is investing heavily in Brazil 🇧🇷, so the pieces are falling into place! 🤞

2024-02-06 13:56:31 UTC

What if we recycled the dollar sign as the sats symbol? ♻️
#Bitcoin will replace fiat currencies, leaving $ up for grabs.
No need to buy new keyboards.
But $ represents the opposite of our values. Wouldn't it be more symbolic to trash both fiat and $? 🗑️
https://m.primal.net/HaxM.jpg

2024-02-04 13:00:47 UTC

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the lack of a sats symbol is certainly not the largest problem around, but it's one of them. we can fix them all. rest assured that this is not distracting the team from the most pressing issues (force closes included)

2024-02-02 18:24:20 UTC

it was an honor to host this panel at Satsconf featuring @npub12rv…85vg , @npub19kv…e2qd and Nickolas!
timely convo on custodial vs self-custodial wallets/solutions:
https://www.youtube.com/watch?v=TZIxAEdhatk

2024-02-02 14:15:06 UTC

Many sats symbol ideas faded in and out throughout the years, none reaching full consensus. In this post, we'll go on an archeological journey to uncover most past symbol ideas: https://blog.bitkit.to/the-quest-for-the-ultimate-sats-symbol-a-post-mortem-ba7d6c56a513

2024-01-31 16:26:04 UTC

We have a surprise announcement! 🎁
For #Bitcoin to be adopted globally, it needs to be as user-friendly as possible — even when it comes to seemingly minor details.
And there's one detail we've been missing for years: a unique and recognizable symbol for sats.
Reaching consensus on a new symbol is hard, but it's worth the effort.
A sats symbol has the potential to transcend language barriers, akin to $, ¥, €, or £.
So we decided to embark on this quest.
Read our announcement: https://blog.bitkit.to/we-still-need-a-sats-symbol-d1471d46131d

2024-01-27 12:58:03 UTC

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that does seem like the most likely outcome, yeah

2024-01-26 21:53:13 UTC

it's fascinating to watch the growing awareness of the "zero interest rate phenomenon". i hear about it in every non-#bitcoin tech circle nowadays
now that the concept of malinvestments is mainstream, i wonder how close people are to grasping what fixes this... ⏳

2024-01-26 15:13:05 UTC

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interesting! curious to learn more

2024-01-26 13:50:30 UTC

regulated exchanges have an easier time implementing Lightning withdrawals than deposits because sender privacy is pristine, unlike receiver privacy.
i wonder if blinded paths/bolt12 will make it harder for exchanges to integrate Lightning withdrawals 🤔

2024-01-24 13:29:24 UTC

awesome to see @npub18m4…cl2x's Lightspark contributing back to the community
it'd be easier for them to stay in their lane after the backlash they've received, glad they didn't
hope their fresh perspective will be valuable 🤞
https://github.com/lnurl/luds/pull/252

2024-01-11 20:36:30 UTC

congrats to the brazilian Hashdex team 🇧🇷 for making it into the selected 11 and all, but seriously... $DEFI gotta be the worst possible ticker for a BTC ETF. DeFi is the antithesis of everything #bitcoin stands for.

2023-11-06 02:40:00 UTC

my fav band + 2nd fav wallet
radiohead x @npub1xnf…lpr5
tks @npub19kv…e2qd https://image.nostr.build/003f69403dd2b0bcf97ba279c3e10e2cce5ec80c71174ef500775dfc62db9e76.jpg

2023-10-02 15:28:29 UTC

TIL the term "hyperbitcoinization" was coined by a BSVer

2023-09-27 00:30:59 UTC

watching a random iPhone 15 vid, and the top comment advocates for violence as a fix to a small problem
i wonder what they'd advocate for if there was a virus spreading around the globe https://image.nostr.build/914cb5817fb4f532d8ce471310e4ad2ab0507b75a1337b11012535cfbd6590b6.png

2023-09-13 22:37:00 UTC

seeing how frequently people pay to the right mETH address through the wrong network makes me glad we have bolt11 invoices

2023-09-12 19:53:13 UTC

Nunchuk's Byzantine is one more example of their top-notch product thinking 👌
one of my fav product teams in the industry
excited to see whatever they're building next!
check it out: https://nunchuk.io/blog/byzantine
kudos @npub1qp3…yn58

2023-09-11 20:45:48 UTC

Prime Trust rugs @npub10wq…achh users > silence
Fortress (supposedly) rugs @npub18p6…0k8k > loud and clear backlash
Swan’s larger mindshare only partially accounts for the disparity. There's a deeper lesson lurking here… 🍿

2023-09-09 14:42:30 UTC

I wonder when (or if) @npub1agh…mhct will introduce paid apps on their Store to bring in SaaS revenue.
How low is the willingness to pay of FOSS enthusiasts?
How can you market COSS to them without inciting a PR crisis like the update-checks-leaking-IPs incident? #note1vtv…kpue

2023-09-04 17:32:15 UTC

what my mind pictures when I hear Fedimint promoted as "second-party custody": https://cdn.nostr.build/i/70baef5882b14eaa2f61043798281ac24b4ac9200a02b7f8d5877ccf8952d5cd.jpg

2023-09-01 17:03:13 UTC

Bitcoin wins because it monetizes ideology

2023-08-31 01:26:58 UTC

Decision to Leave (2022) has the best cinematography + editing and the most creative shots I’ve witnessed in years
Korean filmmakers are just built differently https://cdn.nostr.build/i/fd8c02f6afefaff129b3613ba81bb523900c59add6a14808bcf1eee562f96493.jpg https://cdn.nostr.build/i/7765764cb09992e65bbe45f08f79065dc8a19c50098ec49affdb67a2cc3e638b.jpg https://cdn.nostr.build/i/9e8d211886e8fa93ec077e61829a8ffd7fe862cd805251eb35079e1db7ab71f4.jpg

2023-08-29 20:42:22 UTC

Fascinating to think that one day, we may look back at time-locked recovery paths in the same way we currently view bare multsig.

2023-08-29 13:43:06 UTC

This talk by @npub1j8d…26k2 is fire 🔥!
Bullish on all the possibilities unlocked by Schnorr starting to get realized.
Can't wait to snap some signing devices together!
https://www.youtube.com/watch?v=SHmYHV5V1ao

2023-08-22 11:40:00 UTC

URSF https://cdn.nostr.build/i/0a350f2aad80444655d36f81f1532ab5b2dec15a862051dc08a09344d22f2d9d.jpg