Râu Cao ⚡

Traveling full-time since 2010. Working on open-source software daily. Currently working on a Maps app, with Nostr integration for place reviews coming soon: https://marco.kosmos.org

Public Key

npub1raustrrh5gjwt03zdj8syn9vmt2dwsv9t467m8c3gua636uxu89svgdees

NIP-05 Address

raucao@kosmos.org

Profile Code

nprofile1qqsp77g933m6yf89hc3xerczfjkd44xhgxz46a0dnug5wwagawrwrjcpz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0ds9dzzl4

Publishing to

relay.damus.io

nos.lol

Author Public Key

npub1raustrrh5gjwt03zdj8syn9vmt2dwsv9t467m8c3gua636uxu89svgdees

Show more details

Last Notes

2026-04-14 05:15:16 UTC

- reply

If you're talking about spam posts, then just turn off public account registrations instead of hiding all the content.

2026-04-14 05:13:29 UTC

- reply

This helped a lot on ours:
https://gitea.kosmos.org/kosmos/chef/pulls/626/files
I think the only real solution is PoW for unknown clients, which I'm setting up next via https://anubis.techaro.lol/ — but our Gitea has been usable for a couple months now, after the simple quick fix above.

2026-04-13 16:04:23 UTC

- reply

Been hosting it for years now, and never regretted it.
The AI scrapers are pretty annoying with any self-hosted, public Git web servers these days. Slowing down 404 responses helped us a lot, but looking into adding some PoW for unknown clients next: https://anubis.techaro.lol

2026-04-12 11:09:56 UTC

@npub1864…t2tq I wanted to visit the wiki page linked from the website just now, and it seems like it's behind a login wall. Is that intended?
https://gitea.btcmap.org/teambtcmap/btcmap-general/wiki/Tagging-Merchants#shadowy-supertaggers-

2026-04-11 18:10:42 UTC

- reply

Change it while it's young.

2026-03-28 18:52:51 UTC

- reply

The German solution to literally any problem in 2026 is just more central planning.

2026-03-26 18:33:03 UTC

- reply

https://image.nostr.build/8a682be77cd4d6c31071ca6fd7498b797f80201251cb19667d140227bd6a43b6.gif

2026-03-26 12:07:36 UTC

@npub1uac…99rx Hey. I'm wondering what the reason was for archiving the https://github.com/sandwichfarm/nostr-geotags repo. Has it moved elsewhere perhaps?

2026-03-19 10:07:22 UTC

There's finally a quality app for editing and annotating screenshots on GNOME. I gave it a try, and it's exactly what I was waiting for:
https://flathub.org/en/apps/be.alexandervanhee.gradia
I love the blur-out tool for obscuring parts of the image, but all the other ones also work really well.
https://image.nostr.build/5f61402b12f4fa590d1022687d0ebde59bdab7b4603089fd53dc135c5532d8c3.png

2026-03-19 08:41:36 UTC

- reply

X is also responsible for pushing Bitcoin drama queens into everyone's timelines. BIP-110 being a prime example. Could just be automatic engagement optimization, but it's still sketchy.

2026-03-16 11:38:40 UTC

- reply

I'm only spending some time there again recently after a long absence, initially for an entirely different topic that isn't covered on Nostr or the fediverse at all. So I have no idea when it shifted in this direction. It's just wild looking at the result now.

2026-03-16 06:53:45 UTC

The parallel BIP110 dimension that is X these days is quite astonishing. It's like you can jump in and out this parallel dimension simply by visiting that website.

2026-03-10 08:14:46 UTC

- reply

Congrats, you're the first to bring this troll clown to my Nostr timeline. I thought only X users were naive enough to enjoy this guy's asinine takes.

2026-03-07 09:57:58 UTC

- reply

Maybe it doesn't allow Visa ads. Good. 🤣
#nevent1q…0lkz

2026-03-07 07:44:00 UTC

@npub1ktt…yhz0 Is your relay private now, or did I hit some kind of overeager spam control? 🤔
https://image.nostr.build/a6739fc4ab1dd25b53227bb4fba634784a2b341f90bdc09fb466bade5e28a3fc.png

2026-03-07 07:41:23 UTC

Was looking for a coffee shop to work from in the area and accidentally ended up with this view:
https://image.nostr.build/f2e1fd3a67ba4e85fa8f5360df42c0b5d0d70cda117cc893c556c7276150b408.jpg
I think I might come back here, because it's actually somewhat motivating for working on bitcoin-related things. 😅

2026-02-25 13:24:29 UTC

This is cool, but why would I want a social identity attached to my network access? Don't we want our transports to be as anonymous as possible? Maybe I misunderstand how this works, or what it's for...
#naddr1qv…musk

2026-02-25 08:35:56 UTC

- reply

"Require" "on Linux" 😂

2026-02-13 05:29:22 UTC

- reply

... and then writes another post apologizing for the first one. There's no such thing as bad publicity I guess. 😅

2026-02-04 05:15:28 UTC

"Strong minds discuss ideas, average minds discuss events, weak minds discuss people."
Time to build.

2026-02-02 05:09:08 UTC

- reply

Nostalgia:
https://image.nostr.build/830b1188a6b24a31c544f4d3470a7aa6765da418359df1e41353fb450bd6944a.png
That logo was so recognizable and widely known, that they were able to replace it with a barcode when the EU banned tobacco advertising in Formula 1:
https://smart-motoring.com/latest-news/the-barcode-that-had-everyone-talking/

2026-02-01 01:50:27 UTC

"For the first time ever, good talk is exponentially more valuable than good code."
https://nadh.in/blog/code-is-cheap/

2026-01-29 01:18:22 UTC

- reply

I love how central banks always claim that their primary mandate is price stability. 🤡

2026-01-27 04:54:35 UTC

One thing that's interesting to me is when FOSS creators complain about LLMs "stealing" "private" code. Isn't it actually amazing how you can use the LLMs' knowledge of that code for creating more FOSS now? Epic win in my book.
Free ALL THE CODE! ✊

2026-01-19 04:32:09 UTC

Is there any Nostr event kind for reviews that includes a property for a rating/score? I.e. "4 out of 5 stars", like GMaps or Amazon.
I'm adding Nostr place reviews (with photos) for OSM POIs to my new unhosted maps app this week, and I don't want to reinvent the wheel.
/cc @npub1864…t2tq

2026-01-19 04:02:27 UTC

- reply

The problem with Arsenal is they always try to walk it in.

2026-01-18 10:07:20 UTC

- reply

Using it every day at @nprofile…p90w this month. So good.

2026-01-15 07:09:13 UTC

- reply

Sending money to friends from different continents was the initial reason we started settling our tabs in bitcoin at @npub1pcz…0utg from 2014 onwards. It's still one of the most powerful USPs compared to the legacy system, even with Wise etc. making it much easier between the largest currency zones these days. Most of the world's population does not live in those zones.

2026-01-13 04:50:39 UTC

- reply

Best practice (which is probably rarely followed) is to let users add multiple passkeys to the same account. That said, the level of lock-in they achieved by not letting you export anything and syncing only to a certain ecosystem's cloud servers in all big vendor implementations is completely over the top.

2026-01-12 09:27:55 UTC

- reply

+1 would use

2026-01-10 04:54:20 UTC

- reply

What about AMD hardware? Something like this for example: https://www.bee-link.com/products/beelink-gtr9-pro-amd-ryzen-ai-max-395?variant=47842426192114

2026-01-10 04:12:56 UTC

I don't think we all use the same definition for the term "censorship resistance":
https://docs.v1.pod.network/architecture/censorship-resistance
A permissioned network with known validators, of which you only need to compel a third to censor transactions or freeze funds, is almost the opposite of "censorship-resistant" in my book. Maybe I'm missing something? 🤔

2026-01-05 08:08:15 UTC

Not sure how many clients can deal with calendar events at the moment, but I just published my first one:
#naddr1qq…u4av

2026-01-05 07:58:53 UTC

🎉 Join me at Hacker Beach!
📅 December 31, 2025PST
📍 Koh Lanta Yai, Thailand
Hacker Beach is a month-long, spontaneous, self-organized gathering of hackers and like-minded people on a tropical island (or coast). It happens every year in January.
There is no organization, no prepackaged deal, no tickets to purchase, or registration forms to submit. The gist is: if you want to recharge your body and mind in a warm and relaxed place, with enough Internet to work and play from, affordable accommodation, delicious food, and no rowdy tourist groups around, but instead a bunch of hackers and their friends… just show up at our destination sometime during the month of January!
🔗 https://plektos.app/event/naddr1qvzqqqrukgpzq8meqkx80g3yuklzymy0qfx2ekk56aqc2ht4ak03z3em4r4cdcwtqqjxywtpxajnsd3k95uxzwpe956rwe3394sn2dph95engd3jvdsnze3svd3nx6sjwc2

2026-01-03 15:56:58 UTC

- reply

Start collecting tokens today

2026-01-03 15:50:22 UTC

- reply

Start collecting tokens today.

2025-12-31 09:07:53 UTC

Someone should organize a Nostr meetup in Da Nang:
https://image.nostr.build/47de3cb26d7afe843183dbf53cc236634e11399025b8ea617ad1ae456a2012f5.jpg

2025-12-30 07:56:59 UTC

This is a neat idea:
https://listenlater.net/
Could probably be replicated with ecash payments to a Nostr AI service for processing, then storing the files (incl. an updated RSS document) on a Blossom server or similar.

2025-12-26 15:43:13 UTC

- reply

Because the temperature of water freezing is what affects most life on Earth, so it's the best reference point for our puny brains.

2025-12-25 06:37:47 UTC

- reply

They're world-class in saying No!

2025-12-23 12:58:21 UTC

For someone without any experience in AI image generation, what are currently the best options for generating decorative illustrations (e.g. of mascot animals) with transparent backgrounds, and perhaps even in SVG format, for use on websites and in apps?

2025-12-21 03:08:52 UTC

- reply

Yes and yes.

2025-12-17 06:04:45 UTC

Testing a ZapWatcher at bitcoin++. Plz zap.

2025-12-06 14:12:06 UTC

- reply

Her side is that of "democracy", but they didn't let anyone in the EU vote for this, of course. 🤡

2025-11-23 13:05:16 UTC

- reply

Ask Apple why they don't allow 3rd party access to competing NFC wallets.

2025-11-19 13:19:01 UTC

- reply

Would be nice for it to state that it requires access to camera and mic before the payment, not after.

2025-11-17 11:24:04 UTC

- reply

When an organization as anti-democratic as the EU Commission talks about Saving Our Democracy™, you immediately know that that's not the intention.

2025-11-12 17:28:17 UTC

- reply

Your second sentence changes the context for the first. Maybe you didn't intend that.

2025-11-12 17:26:10 UTC

- reply

Are you willfully ignoring core working on making the kernel usable for alternative node implementations?
https://github.com/bitcoin/bitcoin/pull/30595

2025-11-12 15:14:16 UTC

- reply

We have people claiming that Luke is the most important bitcoin dev. I think that's enough.

2025-11-12 15:11:37 UTC

- reply

sshuttle is so good

2025-11-12 08:56:31 UTC

- reply

I wish they would finally bring it on.

2025-11-11 21:03:02 UTC

- reply

More importantly, merchants should always add the ~3% (or, depending on their location and risk profile, up to 9%) card fees on top of the final price if someone wants to pay with a card. People think it's all free, and most aren't even aware that the merchant pays for it.

2025-11-10 08:39:02 UTC

- reply

This is hilarious, because the TSA does not verify your identity, as he claims. It's actually an example for the kind of security checks that Google already has in place.
Also, "to create a trusted ecosystem, that ... developers can trust"? 😂

2025-11-09 11:07:19 UTC

- reply

How?

2025-11-04 20:51:33 UTC

Dear Nostr,
Good morning.

2025-11-03 00:10:01 UTC

GN
https://image.nostr.build/63911e616d0ba48a7eb87455c7bbd37f9eb894bea5d90e3093b70e4f82317fa3.jpg

2025-11-02 10:37:04 UTC

- reply

I think the FEP numbering/naming scheme is better, and could be adopted for NIPs: https://codeberg.org/fediverse/fep#submitting-a-fep
In short: don't use numbers, use the first few characters of a hash of the (initial) title. Much better to have an agreed-upon scheme than random/custom IDs.

2025-11-01 17:22:24 UTC

- reply

https://image.nostr.build/b14a7cbab476d16717531f3110b22c8b9ce847a7edb12e53221466ad5d4c5508.gif
Proving my point exactly.

2025-11-01 15:53:40 UTC

- reply

Why do some many Nostr devs pretend that Google is the only thing thing that exists? Use https://cryptpad.fr or host your own.

2025-10-30 10:08:25 UTC

- reply

Signal has MobileCoin: https://support.signal.org/hc/en-us/articles/360057625692-In-app-Payments

2025-10-30 10:06:44 UTC

- reply

Almost there. The pubkey needs to be 32-bytes lowercase hex-encoded.
(Personally, I use nak for convenient key operations: https://github.com/fiatjaf/nak)

2025-10-28 09:37:49 UTC

- reply

Hey Jens, nice to find your pubkey in my feed reader today!
Here's a tip for your NIP-05 address: most Nostr apps are entirely unhosted, so they have to be able to validate your address on the client side. Meaning you need to server CORS headers for that to work...

2025-10-27 16:28:07 UTC

Bitcoin Core v30 adoption seems to be going faster than most major versions before it. I think people (mostly the ones who aren't vocal on Elon's website) are upgrading more timely to make a point.
https://image.nostr.build/43205f5758bdce43bb7fe7f34008e1cf86d430dde68baa2eeba33e7081666640.png

2025-10-27 11:12:49 UTC

- reply

Looks great!
Unrelated to Relatr itself, but could you please add an RSS feed to your blog?

2025-10-25 07:52:22 UTC

- reply

Legality doesn't matter much for the pardon itself, of course, but pardoning someone convicted of actual fraud looks very different from pardoning someone, because you think (or at least claim) the convict was wronged in some way.

2025-10-25 07:48:35 UTC

- reply

The people at Servo can, and they're making good progress:
https://image.nostr.build/084bf95bd821188a392be44e488c61e65dea905fdde791a63700888ee2832998.png
https://servo.org

2025-10-25 07:25:22 UTC

- reply

Fraud is still illegal, even if you removed all AML regulations (the violation of which CZ was convicted for).

2025-10-22 21:09:36 UTC

True. A single $3 coffee transaction can also be considered spam, at least by *some* people, compared to settling e.g. 500 different $3 transactions from a second layer in a single tx.
Similarly, that second-layer tx settling 500 coffee payments will also be considered spam by *some* people, because the same second layer may be used to trade monkey JPEGs or whatever the hell the market thinks is worth something at any given time.
To each their own, as long as they pay the fees.
#nevent1q…tf7y

2025-10-20 10:05:45 UTC

- reply

All of my decentralized services are up, not just Nostr.
https://image.nostr.build/7ad5401c7a66180cb7965378f40ec37f6889e9f67d099a857a77e834ed3d3561.gif

2025-10-17 14:52:17 UTC

- reply

It's not one color, as I just explained. Not understanding how the colors work doesn't make it "nonsensical".

2025-10-17 09:16:20 UTC

- reply

Btw, that's not just Apple (but they invented the protocol). Every decent CalDAV client supports those colors.

2025-10-17 09:14:29 UTC

- reply

How is that bizarre? Usually you have categories like "Work" or "Personal", and you can then easily identify events in your calendar based on the color, without having to read category names.

2025-10-16 08:07:24 UTC

- reply

You're welcome to try.

2025-10-15 12:52:17 UTC

Two different wedding guests left us UTXOs as a gift. Both are old friends of mine, from long before bitcoin times. Feels good, man!
https://image.nostr.build/91d9b78f8c660042a30f21e419a0789d281ef32c4354d424b3bb289f751a9c9f.jpg

2025-10-15 12:10:10 UTC

Is there any non-KYC debit card with bitcoin top-ups that still works?

2025-10-14 11:46:52 UTC

- reply

Nice! Would be great if it prioritizes my own configured relays, too. At the moment I'm seeing many relays I'm not even posting to before my own preferred relay...

2025-10-14 10:52:54 UTC

- reply

Thanks for proving my point. Onward.

2025-10-14 10:32:28 UTC

- reply

I'm not sure you understood the reply correctly. It's an asinine meme that counters the very point it intends to make.

2025-10-14 10:19:43 UTC

- reply

Everything but better brains. Rather ironic and fitting. Superficiality over intelligence. Drama over reason.

2025-10-13 17:06:38 UTC

- reply

Unfortunately, your primal brain will keep doing this inevitably to a certain degree. It needs to decide within the first second or two if something or someone is a real danger to you or not. And, for good measure and evolutionary success, it'll also establish if you can eat it or mate with it.

2025-10-13 12:46:52 UTC

- reply

(This time it's Minibits again, in case that helps.)

2025-10-13 12:44:05 UTC

Every time I try to get reasonable amounts (e.g. ~100 USD) out of Cashu via Lightning, any app or Mint I try is giving me issues (every single time so far). Interestingly, every app will accept my incoming Lightning payments immediately and with zero issues, and will only fail the outgoing transactions.
Am I the only one experiencing this? I also tried sending directly to Kraken for good measure. Their node isn't exactly short on liquidity or channels. However, our own node also has plenty of incoming capacity for low amounts like these.

2025-10-13 06:55:32 UTC

- reply

They're already experimenting with bitcoin mining for grid stabilization at TEPCO:
https://stephanlivera.com/episode/609/

2025-10-11 09:57:41 UTC

The almonds around here are ripe and delicious now:
https://image.nostr.build/16ec3d31c34b8bbdffa27876f9ae2f02d79f3ebca320ec86ac499ffc9a6733bd.png

2025-10-11 09:30:30 UTC

Step 1:
https://image.nostr.build/ffe5303edbd53d90b2110ba2e9d32b1c36960aada6110e1567b685a447b0c0e7.png
Step 2:
https://image.nostr.build/a38680b4a43036e3b90389ac6005e19c6d31c3eb662cbffb08b7fe87d987510e.png
Step 3: ?

2025-10-10 11:51:07 UTC

@npub180c…h6w6 Just FYI, the alternate links on your website are currently broken:
https://image.nostr.build/c87e4fa21eb391a85f38741bca3f59073a03b83234b71de04109b648deb7303a.png

2025-10-04 11:53:47 UTC

TFW you wake up with a ring on your finger
https://image.nostr.build/31882af0b379b64812110da8950fbf25af13600e7647dcd9cea7f7653e95f128.jpg

2025-09-28 08:14:02 UTC

- reply

I write local Markdown files and use this script to publish them as Nostr articles:
https://nostr.kosmos.org/@raucao/2025-04-24-markdown-to-nostr

2025-09-27 19:36:23 UTC

- reply

(Pretty dresses, too, of course.)

2025-09-27 19:33:41 UTC

- reply

What a beauty... that Mercedes W124!

2025-09-26 13:52:15 UTC

- reply

One would hope that most Nostr apps respect your relay settings, so that your personal relay is that place.

2025-09-26 11:51:57 UTC

- reply

Yet another option for more technical users would be to do it with a dedicated sync program on their computer. For example, I automatically sync my Nostr events to my laptop in a background job once an hour. Would be rather easy to just post them to RS from there, too.
That said, I still like the original idea of it being as easy as flipping a switch in the account settings, so that I as a user don't have to worry about any of it.

2025-09-26 11:45:34 UTC

- reply

I meant the/a Kosmos relay, but it could also be a more generic program that follows pubkeys on multiple relays.
From an operator's point of view, it's not fun having to connect to arbitrary other relays via WebSockets, and you have to build in a lot of fault tolerance to deal with timeouts and such.
Another option would be to do this directly in a Nostr client, of course, but then it wouldn't work with arbitrary clients. However, the RS-enabled client can sync all the events posted by other clients and back them up to RS once received.

2025-09-26 10:26:58 UTC

- reply

https://www.therage.co/leaked-luke-dashjr-bitcoin-hardfork
I won't link any of the replies, but Nostr is currently full of simplistic "they're lying" posts, with no added facts or arguments, and no refutation of the messages being authentic.

2025-09-26 09:49:05 UTC

The drama of the day is frankly just embarrassing. Either the screenshots are real, and thus all claims of lying simply criticize the article's wording, but not the substance. Or they're fake, and the journalist in question is intentionally spreading carefully fabricated misinformation. There is no other option, it's as simple as that.
If the latter were the case, then why is there still no explicit claim of the screenshots having been faked?

2025-09-26 09:03:20 UTC

- reply

Yeah, so my idea (and rough plan) was for kosmos.org users to have anything they post to the Nostr relay be synced to their storage automatically, so then other apps could go and cross-post content from there (in addition to just having a syncable backup and potential cache there, too). As you say, the transports can be much more agnostic, as long as the original content is signed by someone's key.

2025-09-26 08:58:34 UTC

- reply

It's a silly argument really. It inherently acknowledges that their problem is already solved by Nostr, but since they themselves are unwilling to simply use that and onboard people to their own relays and/or clients, the solution is not good enough for them and their peers. Maybe it's a practical joke by an xkcd fan? 🤔

2025-09-25 22:33:09 UTC

If someone's claiming that CSAM is why you should censor or centralize anything on the Internet, then it's virtually certain that they're on the wrong side of history. Not because CSAM is desirable, but because it's an absurd cop-out argument that you could equally apply to a printing press. And the only people who usually make it are censorious anti-Internet politicians.

2025-09-25 22:16:26 UTC

"ANProto operates under the working theory that Nostr will never reach anyone besides Bitcoiners."
https://anproto.com