Egge

Building https://npub.cash 🥜 Working on awesome nostr, cashu and Lightning stuff 💜⚡️

Public Key

npub1mhcr4j594hsrnen594d7700n2t03n8gdx83zhxzculk6sh9nhwlq7uc226

NIP-05 Address

Profile Code

nprofile1qqsdmup6e2z6mcpeue6z6kl08he49hcen5xnrc3tnpvw0mdgtjemh0spp4mhxue69uhkummn9ekx7mqpramhxue69uhkummnw3ezuetfde6kuer6wasku7nfvuh8xurpvdjsvw3lre

Publishing to

nos.lol

nostr.einundzwanzig.space

e.nos.lol

nostr.mom

relay.nostr.bg

Author Public Key

npub1mhcr4j594hsrnen594d7700n2t03n8gdx83zhxzculk6sh9nhwlq7uc226

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Last Notes

2025-07-13 08:35:29 UTC

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GM :) installed goose CLI, set it up with openrouter. Then I discovered https://github.com/azorng/goose.nvim which integrates it into nvim.
I added a couple of recipes and added them to my key maps via Snacks Terminal. E.g. letting goose inspect my staging area and coming up with a proper commit message, then commit the files

2025-07-13 08:07:49 UTC

I have fully integrated goose into my workflow… what can I say, time to remove the “Toxic anti-vibe-code maximalist” from my bio lmao…
I still believe that you should do research, iterate, fix bugs yourself to grow. Read to learn about design and architecture. Don’t let LLMs take this away from you. But when it’s time to go fast, let AI help.
It’s like Star Wars. Let the computer plot your hyperspace routes, it is better at this than you ever could be.
But when it’s time to dog fight at close range you better have some sick piloting skills ready to take up the fight

2025-07-02 19:58:56 UTC

My wife prepared a party for my daughter’s second birthday. 🎂🥹
https://image.nostr.build/1f718c9399d8fe627966998336dc5067f244b47dfc93386b4e09db3d9a91ffca.jpg

2025-07-02 11:03:21 UTC

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Yes!! I started building this back in the day when I was still working on Current. We used bloom filters to keep track of the notes you liked, so that we could update the frontend more efficiently.
Adding it for viewed posts was a possible next step, but we did not get to that.

2025-07-01 19:47:56 UTC

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Glad to hear that things works out in the end.
No, the wallet page on npub.cash was always meant to be a demo. It’s not fool-proof and quite error prone. The npub.cash API was always supposed to be complimentary to a full-fleshed wallet. The goal is to have many wallet implement the API and have many people host their own npubcash-server instances. Then it will truly be seamless.

2025-07-01 12:19:57 UTC

Feeling reckless? Give npub.cash v2 a try!
Go to Cashu.me
Log in with NIP-07 extension
Enable Lightning Address + experimental npubx.cash
Receive zaps on your npub.cash v2 address!
https://blossom.primal.net/41571d1b8ca295ab940a6494ac8d33a80d610122d6da0bad2228797ffe1ff4a5.mov

2025-07-01 07:26:34 UTC

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People don't understand the concept of coins to begin with.

2025-07-01 07:24:10 UTC

Running omarchy. Let's see what this is about!

2025-06-30 15:53:12 UTC

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Yes, you can use a NIP-07 signing extension to login to cashu.me with your nostr profile

2025-06-30 15:10:54 UTC

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Not exactly. npub.cash v2 will not have a standalone wallet interface. The service can be used through wallets that implement the API.
For v2 these are Cashu.me and Sovran right now.

2025-06-30 14:36:01 UTC

npub.cash v2 allows you to change your username as often as you like.
You send a post request with your new username and some sats in the header and the server updates your username.
Cashu-402 is beautiful 🥜

2025-06-30 13:46:59 UTC

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💜🫂

2025-06-30 13:18:45 UTC

PSA: I have just copied all usernames from npub.cash to npubx.cash! So if you want to get involved in testing, you can do so using the same username. 💜
Testing is best done through https://cashu.me (enable experimental npubx.cash in the settings).

2025-06-30 12:36:38 UTC

Zaps are showing up in my Cashu.me wallet. What a time to be alive.
https://blossom.primal.net/2a8774db0b1ae0e88a8937fb28ab4e7186ec0cc1b9f2789bac87d12c6aef4527.png

2025-06-29 17:15:49 UTC

This is the best thing I have done in a while 😍
https://image.nostr.build/a683e5ea8a8c84093e0cc3df590fcc1bb27c3cac67c72fb3ee675103afa64834.jpg

2025-06-29 12:09:54 UTC

Someone should write a AI garbage collector. It keeps check of all the references in your code base and deleted the garbage AI kept lying around that is no longer needed.
#note15a8…rduu

2025-06-28 14:14:21 UTC

This is such a great comparison! IKEA is cheap, and insanely fast, while offering a result that looks not to bad and gets the job done.
But after moving or reassembly, things start to fall apart
#note12ac…zk8h

2025-06-28 11:48:22 UTC

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That’s v1 though :)
v2 will only be available through wallets and clients. Cashu.me and Sovran implement it rn

2025-06-28 11:36:52 UTC

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Many internal changes, like no longer relying on an external lightning service. Now everything is done inside the Cashu ecosystem.
V2 no longer mints ecash for you, but only keeps track of the minting claim, so that the wallet can mint the ecash itself.
Users can now select their preferred mint as well.

2025-06-28 11:17:19 UTC

You can test the experimental version of npub.cash v2 on https://cashu.me 🥜
Settings -> Experimental
https://blossom.primal.net/474faf75c4f987063b76621ae216b319ffa33fb99d3ac89d5396d9710d8eee1a.jpg

2025-06-26 16:27:48 UTC

Fixed a nasty bug with npub.cash v2 web sockets.
Subscriptions where "vanishing" all the time. Well obviously a memory based subscription manager does not work well with a distributed deployment.
Easy fix: Downscale to one machine

2025-06-26 14:32:23 UTC

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Here you go sir: https://shop.bitbox.swiss/en/products/baseball-cap-open-source-48/

2025-06-26 14:31:57 UTC

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The lib is structured in multiple packages. The core package is built to run anywhere.
I only recently started writing this, so its very very early. But the goal is that this can be used to quickly add cashu wallets to any JS environment, without any hassle.
I'll make sure to send you a repo link asap.

2025-06-26 13:43:38 UTC

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Lets go then! The code from the image is using a library that I have been secretly grinding my gears on for a while now. It is basically an abstraction on top of cashu-ts that includes logic for managing state.
It is designed fully modular, requiring consumers to pass in a repository class that takes care of persistence. So if we can write an adapter for CRUD operations using nostr I see no issue in this at all.

2025-06-26 12:29:38 UTC

Imagine writing a fully functioning, reactive Cashu wallet component in 21 lines of code.
https://blossom.primal.net/d373f30be8cd77bba5806bf78d9eee33ada307a72f9e87a7a0fc497ace4bcd3c.png

2025-06-22 14:15:27 UTC

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yes, seems to be a proxy issue. seeing nginx errors. I myself am getting tons of spam rn, maybe it’s dos? hopefully it’s back soon.

2025-06-22 13:46:21 UTC

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Update: Unfortunately the issue is with the default mint for npub.cash. Until the mint is up again, npub.cash can not serve invoices.
#nevent1q…uzk5

2025-06-22 13:23:14 UTC

GM! There seems to be an issue with npub.cash’s Lightning backend. I am investigating and hope to resolve the issue asap.

2025-06-22 13:21:49 UTC

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Thanks for bringing this up! Seems to be an issue with the Lightning API. Investigating…

2025-06-21 08:33:22 UTC

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Certainly not dead, try clearing your cache. I recommend not using the Demo interface on the website, but instead enabling npub cash in one of the wallets that support it (Cashu.me on web or sovran for native).
With NPC v2 the website interface will be discontinued.

2025-06-13 06:55:52 UTC

We have started laying out the groundwork for the next major Cashu-TS version: https://github.com/cashubtc/cashu-ts/issues/315
If you are using Cashu-TS in your projects and want to leave your 2 sats, please feel free to comment on the issue <3

2025-06-13 02:19:47 UTC

4am…

2025-06-12 03:19:21 UTC

3 hours of sleep, 2:30am and I am fully awake… jet lag is the worst 😴
Luckily I have a new addiction: Iced Americano

2025-06-11 01:18:42 UTC

Seoul airport security is insane. German efficiency really can learn a thing or two from this country.

2025-06-11 00:17:31 UTC

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Yup, we had that thought, which is why we went to the ER. But luckily she is fine

2025-06-11 00:16:42 UTC

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Great thought! This info page is generated from the mint’s info endpoint. This information is not “verifiable”, so adding uptime there does not necessarily tell a user anything. However clients could use the nostr discovery to check how long a mint has been known and recommended by nostr users. This is still fakeable, but add WOT to it and it works.

2025-06-10 11:49:17 UTC

Flight back home is leaving in ~12h
My 2 y.o. just hit her head while playing and threw up at dinner. We are now at the ER 😐

2025-06-10 00:45:52 UTC

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This is him @npub1f74…rpa3
Doesn’t seem to be active though

2025-06-09 05:11:25 UTC

Vibe coders in action
https://video.nostr.build/1141f41e61cf7d81cd33b53c6f7e0a40d35c9e05c3207b8613ed61ed77281bbd.mp4

2025-06-09 02:33:44 UTC

Adding WebSockets to npub.cash was a bit less trivial than anticipated, because all sockets need to be authenticated. But I am pretty close to finalizing the integration.
Here is how live updates of incoming zaps look like in cashu.me:
https://blossom.primal.net/3e93b03e594316bb1709620712f1a27f98da11b2e6a51faedcd60bdc804ce5ce.mov

2025-06-08 10:56:05 UTC

Had a lovely time on family vacation! The perfect thing to charge the batteries. LFG and build

2025-06-08 01:52:45 UTC

There must be more Starbucks in Seoul than in all of US :/

2025-06-07 23:05:55 UTC

Vibe coders are missing out
#note1m0l…h6w6

2025-06-07 12:31:21 UTC

Thank you @npub1u07…ez97 for teaching me some dynamic programming. This is freaking amazing 🔥

2025-06-07 06:57:47 UTC

Get working anon 🧡
#note1s3v…9s9s

2025-06-07 06:02:25 UTC

Adding WebSockets to npub.cash v2 🫡

2025-06-06 12:51:46 UTC

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Legacy addresses (1…) are not quantum proof, are they?

2025-06-06 08:33:25 UTC

Won a hardware wallet at the Bitcoin Seoul Conf!
Supports only legacy addresses lmao

2025-06-06 05:22:02 UTC

I studied marketing at university and had no formal CS education. Outside of a high school class, I didn’t write my first real line of code until 2020, in my mid-20s. I started with a basic Python course on Udemy, because I wanted to contribute to the Einundzwanzig Telegram bot.
Fast forward four years: I now earn a living by writing code. The demand for developers in the Bitcoin space is huge. Thanks to organizations like OpenSats and the Human Rights Foundation, it’s even possible to make a living building free and open source software.
You don’t need permission. You can just build things.
With resources available online for free getting started is easier than ever. AI can help a lot too (if used correctly and in moderation). So LFG! If you decide to try it, make sure to let me know and if you are looking for a project to contribute to, make sure to checkout Cashu ;)
https://image.nostr.build/469965c44725d842bdf4aa0875bcdbac33bd0730f24eae8b8ce627b6f9a4535d.jpg

2025-06-05 02:19:05 UTC

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AI can not build something like amethyst. It might be able to rewrite it (even though I would say it’s up for debate if for the better or worse). But coming up with it is something else.
Also even if it would it could never have the same understand for a business and its values a senior has.
AI is a powerful companion for generic tasks, but I don’t believe that it can replace real devs

2025-06-04 05:02:47 UTC

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But in this case you are taking care of the modularisation, no?
I agree, given an interface and some information AI can write an implementation quite well.

2025-06-04 03:58:14 UTC

I think vibe coders are what J. K. Ousterhout describes as “tactical tornadoes” (even though he is referring to them in a different context). Developers who can pump out a feature 0-60 faster than anyone else could. But at the same time they leave a wake of non-maintainable code and bad design behind.
In my experience current AI can not write maintainable, modularised code at scale.

2025-06-04 02:21:58 UTC

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Good! Should be ready for a public alpha soon

2025-06-04 00:56:58 UTC

On my way to
https://www.bitcoinseoul.kr/en 🧡🇰🇷

2025-06-02 20:31:22 UTC

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That is not how it works. A token can not be used as an input twice. The mint will not allow double spending it

2025-06-02 09:40:50 UTC

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Where all deprecated POCs go, on the bottom of my GitHub repositories :<

2025-06-02 09:32:55 UTC

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I built Zap Gate two years ago, but we only built a POC
https://stacker.news/items/180377

2025-06-01 23:08:52 UTC

Looking forward to attending a Bitcoin conference in Asia for the first time next week! I wonder what’s different

2025-06-01 12:15:12 UTC

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No sir, it’s still my daily driver and I prefer working on it. But when travelling and packing lightly I often choose my old MacBook because it has more of my life on it still haha

2025-06-01 11:45:42 UTC

Same place, different beverages 🍻
https://image.nostr.build/6f5e1e11aa19761e637c6d035098cc494460dc35d3fc357bf7fb795769717583.jpg

2025-06-01 11:28:46 UTC

It's about time... Customs mints are finally coming to npub.cash! 🥜 https://blossom.primal.net/9a13845326f032cf883acd992432537dc62950ae1f19da11effdd09e3d953fff.mov

2025-06-01 10:10:47 UTC

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I used expo for it because I found Xcode to be incredibly annoying. If your on Mac it uses Xcode under the hood, otherwise you can use their servers to build in the cloud

2025-06-01 09:42:35 UTC

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Why Xcode in the first place?

2025-06-01 07:08:42 UTC

Shitcoiners be like
https://image.nostr.build/d7f6c52c9cbf2daf5003562931c684d8d2eb018b66cfa941203f897b775e26de.jpg

2025-06-01 03:42:29 UTC

Earl grey and code 🍋
Could be worse
https://image.nostr.build/3b2cefb509830c2f544fa788c747b3562f975ea6c32b7da589404dfae4a8f6bd.jpg

2025-05-30 23:14:21 UTC

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This is true for token without locks. In the offline receive case the receiver would usually specify that the token needs to be locked to a key they control. If that is the case the token can not be double spend.

2025-05-30 22:28:04 UTC

With Cashu you can securely receive payments without an internet connection! 🥜🔏
Here is how it works:
1. The receiver sets up their wallet and chooses a mint (this is done while online). The wallet will download the mint’s key sets and save them locally
2. When the receiver wants to receive a payment (now being offline) the wallet will generate a payment request, specifying the amount, the locking script, and the mint.
3. The sender scans the payment request and constructs the requested token
4. The receiver receives the token. His wallet checks whether the token fulfils the requirements. Then it uses the included DLEQ proofs and the cached key set to verify whether the signature on the token is valid. If it is, the transaction is complete.

2025-05-30 01:33:30 UTC

How do you get over jetlag?

2025-05-29 04:10:39 UTC

Korea is impressive :o

2025-05-23 08:31:57 UTC

Me receiving sats from my npub.cash v2 address using cashu.me (work in progress)
https://blossom.primal.net/ebe211da8e8883d070f221d3da085e00a875cbb1d5abbd15cac762f9d7e8a739.mov

2025-05-23 06:48:00 UTC

By now, you probably know I’m not a big fan of "vibe coding." But before I dive into why, let me clarify: I’m not talking about using AI as a helpful tool to assist with coding. I’m referring to the concept originally described by Andrej, fully giving in to the "vibe," ignoring implementation details, and letting AI take the wheel.
In my view, that approach is mostly useless, if not outright harmful, in many situations. I think most would agree: you can’t build critical systems this way. And you certainly can’t unleash vibe coding on legacy codebases without risking regressions all over the place. Sure, it might work fine for weekend projects (which, to be fair, is exactly the context Andrej was referring to). But those weekend projects are where developers learn the craft. When you "vibe" your way to the finish line, you miss out on a huge part of the learning experience. Software design and implementation is hard and it takes time and repetition to learn. At the same time actual typing will let you master your environment, making you a more productive engineer.
When I bring this up, vibe coders often respond with something like, “Well, mastering AI tools is just as important. If you don’t learn to use them, you’ll fall behind.” Really? Come on. “Mastering” vibe coding tools might take an experienced engineer a day or two. Mastering software engineering (if that’s even possible) takes a lifetime. At the same time vibe bros will constantly tell you that AI is gonna be a completely different thing in 12 months from now, so everyone has to relearn all the tricks anyway.
When I hear that university students are solving their data structures and algorithms homework by just pasting it into ChatGPT, while companies like Amazon are still asking candidates to implement a running median using heaps, it feels like there’s a growing disconnect. And honestly, there’s a bit of delusion on both sides.
I think what I am trying to get at is: Don't let the vibe take away your chance to grow and learn. It is an incredible tool, when used correctly though.

2025-05-23 04:25:14 UTC

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Right, businesses do. As long as this is the state of vibe coding I am not worried one bit about job security lmao
https://blossom.primal.net/0f82eacb24e841fe82088035baf4fcd7d6aa486a79dc55589ea23c840e7052f7.jpg

2025-05-23 04:18:50 UTC

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In 3 months from now 99% of bad code will be written by AI. The last 1% will be me.
nevent1qqsqeyhn5e69qx5xxpmjqtvj7ughr3s9a3g57ssqlawa3ptem5audcqpzpmhxue69uhhjctzw5hx6ef0wccskks5dl

2025-05-15 06:30:52 UTC

Vibe bros getting hard about speed gains when creating boilerplate while still navigating their system by clicking stuff 💁🏼‍♂️
neovim btw

2025-05-11 10:07:36 UTC

I am still not sold on vibe coding… I believe letting AI solve your issues, stops you from growing. And once the AI hits its ceiling you are not prepared

2025-05-09 16:35:29 UTC

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Still had a lower limit of 10 set. Should be working now

2025-05-09 16:02:57 UTC

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Was that a payment < 10 sats?

2025-05-09 15:21:51 UTC

Testing npub.cash v2. Pls zap this

2025-05-07 08:47:11 UTC

Coinbase jumped on the 402 bandwagon... yay!
When I talk to people about Cashu they usually ask me: "Why do we need Cashu? We got Bitcoin and Lightning". I used to tell them that Cashu offers a great alternative to custodial Lightning, but with better privacy. While this remains true, my answer today is that Cashu enables new use cases (or simplifies them drastically) where Lightning and Bitcoin struggle.
One example are Zaps. NIP-61 Zaps offer a very similar experience and value proposition as NIP-57 Zaps do, but require only a fraction of the implementation overhead.
The second example (and inspiration for this post) is HTTP 402. With Cashu, we can streamline payments for requested ressources into a single request. Because Cashu is a bearer asset the whole flow is pretty stateless. It is stupid simple to implement this. While it is definitely possible to make 402 work with other "assets", using Bitcoin / Cashu makes it a breez.
This is my favourite thing about Cashu.
https://blossom.primal.net/b0798bba893532f8eea97928c329a7a78a94f866dd3b71949f32a805198d1752.mov

2025-05-05 17:33:06 UTC

How does one become a great software engineer?

2025-05-04 19:07:03 UTC

I will be hosting multiple Cashu workshops for beginners and intermediates this year. I am fine tuning the slides right now and thought that I could record a free web course using the materials.
Would you watch that?

2025-04-29 11:01:53 UTC

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Fixing as much as I can while building a stash of nuts for my family

2025-04-28 18:40:58 UTC

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Thanks to DLEQ proofs I can verify the token without talking to the mint. I can check whether the signature is valid and if it was actually signed by the mint.
Thanks to locking scripts I can ensure that a token is impossible to double spend, even if I remain offline for a while

2025-04-28 18:37:25 UTC

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Actually when done right an offline receive does not require any more trust than an online one.

2025-04-26 14:48:23 UTC

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You mean if the sender is offline? Yes, offline Cashu transactions always come with some requirements and trade offs.
Receiver offline: sender needs to pick the right token (as defined in the payment request) and include DLEQ
Sender offline: receiver should accept token from all mints and swap to LN to make sure token are real money
Both offline: requires either preparation in advance or a considerable amount of trust

2025-04-26 13:32:02 UTC

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It’s very transparent.
> User requests resource
> Server responds with Cashu payment request (encodes requirements like which mint to use, which pubkey to lock to, amount, etc.)
> user creates matching token and replays the request (this time with token in header)
> server verifies the token and responds with resource
All of this can be automated. If the user does not have a matching token, the wallet will do an automatic mint->mint swap. It’s pretty seamless

2025-04-26 13:27:15 UTC

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With Cashu 402 the merchant / receiver decides which mints are used to pay. So you choose mints that you have some trust in.

2025-04-26 13:08:16 UTC

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But it’s not. With Cashu a payment can be part of a single web request. With Lightning you need plenty (return invoice and identifier, check invoice payment state, return resource after payment).

2025-04-26 11:40:44 UTC

Had an absolute blast showing Cashu to the nutcases of tomorrow at the Swiss Bitcoin Conference 🫂🥜
Slides in German and English will follow soon!
https://image.nostr.build/fed4ed8ff4567d1d727cadc9a56263f348798f835fa27cfd3c81f3481b778495.jpg

2025-04-25 08:38:23 UTC

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Workshop is at Nerd Academy of Swiss Bitcoin Conference. Tomorrow at 10:30

2025-04-25 05:21:04 UTC

Blinding is fun! 🥜 https://blossom.primal.net/070c747e0f016926ea98025db492c8a6ed339cdea7102c1ebf26c2c9ddf2221a.png

2025-04-25 03:34:29 UTC

All set for tomorrow—can’t wait to see who I’ll run into at the Swiss Bitcoin Conference! Who’s gonna be there? 🥜💜
https://image.nostr.build/862bf2986a408d0d5a78581eac7b3f554df5a3b24e8085b8651c64822cf13d0f.jpg

2025-04-23 06:59:46 UTC

What do you use for password management on multiple devices?

2025-04-22 14:53:40 UTC

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I remember when Next decided to include a canary release of react 19 in their stable version. Of course EVERY single package had a conflict. That was fun

2025-04-22 07:23:32 UTC

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It’s an alpha release. Not sure if they publish those to Zapstore

2025-04-22 06:49:39 UTC

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Please try clearing your cache. This might be related to the change in the DM spec. I am currently rewriting the whole service, so if this is indeed a persisting issue it will be fixed soon

2025-04-22 06:24:55 UTC

This is so cool 🥜
https://image.nostr.build/107d395bee2011c5d99f0d84b2c6c0df0b4d7936d00a14e89c4cb6b409540012.jpg

2025-04-21 17:10:41 UTC

I am going to spend some hours in trains soon. Recommend me some software dev books please 🫂

2025-04-20 16:53:27 UTC

Is there a market for attention? How can we make sure that people focus on the “right” things?
Organizations like @npub10pe…n34f help developers focus on the (arguably/subjectively) right things, but is this a sustainable and stainable approach? I feel like the demand for shitcoin developers is higher than the demand for based-af bitcoin devs. What is our solve?

2025-04-17 12:16:13 UTC

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I suspect Ingrid (62) working the town halls office in Bad Segeberg didn’t ask for this lmao