Exactly. Most people don’t understand opportunity cost. View quoted note →

Let's meet on

Pizza Day Prague 2025 | Bitcoin Conference

Pizza Day Prague 2026 | International Bitcoin Conference

May 22-23, 2026 ⚡ Pizza Day Prague is a 2-day international conference marking the 16th anniversary of the first real-world Bitcoin payment

- I will have a workshop on @Linky project there tomorrow.

Now with seamless migration from legacy labeling that was dependent on Google or Dropbox. 🚀 View quoted note →

Come to Prague in June and don’t miss Freedom Tech Summit (powered by @vexl 😎 , event formerly known as dev/hac/day). It’s a highly inspiring and interactive event for people interested in building within the #bitcoin, #cashu, #nostr, and other self-sovereign technology. I’m very grateful that this year I’ll also be giving a short workshop introducing the @Linky project. 🎉

Freedom Tech Summit 2026 | Prague

Freedom Tech Summit (formerly dev/hack/day) - Year 4 of the one-day conference for developers, hackers, and tech enthusiasts diving deep into Bitco...

Satoshi can reveal himself at any time simply by signing a message. Maybe his fingers itch somewhere and he occasionally feels like doing something like that. But quantum computers might make it possible for anyone to eventually create such a signature. In that sense, we will all truly become Satoshi. And finally relieve him of that burden. #weareallsatoshi

Not having control among others is blessing.

@Cashu is great for sharing bitcoin with people who don’t yet have any bitcoin or even a bitcoin wallet. However, when I compose a specific denomination, it ends up being a lot of tokens - in other words, a very long URL that I’m trying to use. The web URL is so long that messaging apps often don’t even recognize it as a link… and it can even look a bit like a scam. In printed form, I can’t use animated QR codes. I understand that using powers of two has many advantages, such as privacy or simpler splitting and merging. However, wouldn’t it make sense in some cases to create one-time exact denominations? Or to keep it composed of many tokens, but allow the mint to temporarily group them into a single alias? Since there is already trust in the given mint, it feels like this wouldn’t introduce additional risk. What do you think? @calle ? 🙏

Banksy strikes again.. The statue looks good to me.

Banksy confirms he is behind new statue in central London

The sculpture in central London of a man walking off a plinth while holding a flag has been drawing crowds.

Another browser extension that shows the prices on any website in real money: https://chromewebstore.google.com/detail/fiat2satoshi/nihiakcjmmnpacepgpfkjbhmndohjkag

We live in a funny time. The governor of the Czech National Bank is giving a lecture about bitcoin. 😀 He says that if they allocate 1% to bitcoin, they can get more value for the same level of risk. Feels good, but don’t forget that fiat is a scam.



Verifying your browser…

Příští pražské setkání @Jednadvacet bude na téma adopce bitcoinu. Vítaný je každý, koho téma zajímá. Představím aplikaci @Linky , se kterou je použití bitcoinu opravdu velmi jednoduché. Po krátké prezentaci bude diskuze - co komu v používání bitcoinu funguje nejlépe nebo co naopak komu chybí. Linky nabízí několik způsobů, jak poslat lidem bitcoin. - Poslat přes Facebook, WhatsApp, Signal nebo jakoukoliv jinou chatovací aplikaci - Fyzicky na NFC kartě - Nebo když už na někoho máte kontakt, tak mu platíte na přímo nebo naopak platbu vyžádáte Přihlásit se na setkání můžete zde:

Praha - Bitcoin meetup #25 - Linky

28/04/2026 18:00 | Restaurace Zlaté sele

Nebo pokud nemáte lightning peněženku:

Praha - Bitcoin meetup #25 - Linky · Luma

Pravidelný neformální meetup pražské komunity Jednadvacet a všech fanoušků bitcoinu. Tentokrát na téma - Linky Představíme aplikaci Lin...

Kdybyste měli chuť pomoct s testováním, tak se můžete přidat do dedikované Signal skupiny:

Signal Messenger Group

Follow this link to join a group on Signal Messenger.

Nebo si to jen tak můžete sami vyzkoušet:

Linky

Linky connects people you care about with simple Bitcoin messaging and payments.

We are building the best tool for people who don’t even know yet they need bitcoin 😀

Trezor Suite is introducing Suite Sync. 🎉 Now you can label wallets, accounts, addresses and having that synchronized between various devices without any email. Privately and only based on your hardware device.

Suite Sync in Trezor Suite

Suite Sync sets a new standard in data storage for labels and more.

And desktop now supports BIP-329 labels exports and imports. Mobile hopefully following next month.

I’m trying to find answers for myself to the previously mentioned questions around @Cashu. Who will operate the mint? Without KYC. It won’t be run by a regulated entity - Mints already exist - it seems this in itself isn’t such a big problem How should a mint be selected in the wallet? - The application can choose a default, but that leads to centralization and additional vulnerabilities. - Select automatically based on defined parameters? Once the scoring is known, it will likely be attackable. - The least bad option today seems to be to set some default mint (for example minibits) and allow easy switching. At least experienced users could consider which mint they use. When they then onboard someone, by sending their first cashu token to a friend they also set the first mint for them. What if a given mint stops working? - If it’s planned, tokens can be automatically moved to another mint. However, the user needs to at least open the app. What if users don’t respond to notifications? - People will lose their funds ⚠️ What if the mint does a rug pull? - People will lose their funds ⚠️ From this, it follows to me that cashu is a great tool for onboarding new users. However, they should move their funds at the first opportunity or above a certain amount to a sovereign solution. Is that simply on-chain? Or is it better to experiment with Ark, Spark? Or Bitkit/Phoenix? View quoted note →

I listened to an interesting podcast where they discussed the pitfalls of a cashu wallet and why it’s likely problematic to support it in the Signal app.
 https://fountain.fm/episode/DcrZUespvsWbHL2wvb35 * Who will operate the mint? It won’t be run by a regulated entity without KYC. * How should a mint be selected in the wallet? * What happens if a given mint stops working? * How can users be migrated? * What if the mint does a rug pull?

What bitcoin app do you recommend to your friends? After checking more than 20 alternatives, I decided to build my own version - designed with each user’s independence in mind. Give it a try and help me make it even better. 🚀

Linky

Linky connects people you care about with simple Bitcoin messaging and payments.

@Linky

Embrace the competitors…

At the last bitcoin meetup, I was intrigued by a 60-year-old bitcoiner who wasn’t interested in any lofty ideas about how bitcoin will improve the world. He simply has bad experiences with the state. Many years ago, he didn’t pay a property tax. It was a relatively small amount. However, over the years, they calculated very high interest on it. Eventually, he wasn’t able to pay it at all. Gradually, debt collectors stripped him of all his official assets. He renounced his citizenship - I’m not sure how he manages it, but he says he only has a passport and a driver’s license. He has to renew the driver’s license every five years, and for that purpose he temporarily arranges citizenship again. I might be using some terms incorrectly. In any case, this person lives in the Czech Republic but doesn’t have any bank account, so he pays for everything he can with bitcoin. 🔥 For that reason, he also dreams of better ways to acquire bitcoin around the world. Like peer-to-peer exchanges even in smaller amounts (for security reasons), based just on location, or cooperating with pensioners who have bank accounts, so they can buy bitcoin for him on exchanges and he gives them cash with an extra fee. And btw his mother is over 80 and collects sats through silly online clicking games. Seems like that the age is not a blocker for using bitcoin at all.

Is there some issue with

Testnut mint

It feels weird to see one week old version of an application 😀