Schnuartz | ClavaStack

Some ultra‑paranoid people feel that not plugging your Hardware Wallet into a device assumed to be malicious could be more secure.

This is how you sign Air Gapped Bitcoin Transaktions

Speaker & Whale Boat Tour through Amsterdam.

First ever Specter 2 Workshop at Bitcoin Amsterdam Conference with around 5 attendees

At this point this are only prototypea with an experimental alpha version that got build

Here physically destroying WiFi Module

Official footage of the BitDevs Socratic Seminar following today's Bitcoin Amsterdam conference.

Another time today meeting Robin Seyr.

We are planning a podcast episode together after Specter 2 gets released.

Really cool to meet Bitsaga Rob at the Bitcoin Amsterdam Konferenz.

We had some really interesting discussions regarding Specter 2, See signer and Bitcoin Security consulting.

Bitcoin Amsterdam ist here

A companion app is software that works alongside a Bitcoin hardware wallet to manage accounts, prepare and broadcast transactions, while private keys and transaction signing remain on the hardware wallet.

Next stop Amsterdam. Who will I meet there?

Jemand kann deine Bitcoin beobachten, ohne sie ausgeben zu können. Dafür reicht bei einer einfachen Bitcoin‑Wallet oft ein bestimmter öffentlicher Code: der X‑Pub.

Mit ihm lassen sich die zugehörigen Adressen ableiten. Wer ihn hat, kann Zahlungen und das Guthaben dieser Adressen verfolgen. Zum Ausgeben benötigt man weiterhin die geheimen Schlüssel.

Das ist wie ein Fenster in deine Geldbörse: ansehen, aber nicht herausnehmen.

Deshalb behandle ich diesen Code nicht wie eine Werbeadresse. Teile ihn nur mit Diensten, denen du diesen Einblick geben möchtest.

Specter in it's simplest form is just a Dev Board with Free and Opensource Software on it.

Würdest du einer neuen App gleich deine ganze Geldbörse überlassen?

Du kannst ihr auch nur einen kleinen Teil erlauben.

Bei BlitzWallet App lassen sich Apps mit der Bitcoin-Wallet verbinden. Die Verbindung heißt Nostr Wallet Connect.

Dabei prüfst du zuerst: Darf die App nur etwas anzeigen? Oder auch Geld senden? Wenn sie bezahlen soll, legst du ein kleines Ausgabelimit fest. Zum Beispiel einen Betrag pro Monat.

Nutze für jede App eine eigene Verbindung. Brauchst du sie nicht mehr, entfernst du sie wieder.

Und den Verbindungscode behandelst du wie einen Schlüssel.

Bequem bezahlen ist cool. Einer App unbegrenzt Zugriff zu geben, muss dafür nicht sein.

Zur Blitz Wallet App habe ich auch ein ganzes Video abgefilmt. Dieses findest du auf dem EINUNDZWANZIG YouTube Channel.

Dieser QR‑Code ist kein Link. Er kann dein kompletter Bitcoin‑Schlüssel sein.

Bei einem sogenannten Seed‑QR stecken deine geheimen Backup‑Wörter im Bild. Das ist praktisch: Eine passende Bitcoin‑Hardware‑Wallet kann sie einlesen, sodass du nicht jedes Wort eintippen musst.

Aber der Code ist dadurch nicht automatisch verschlüsselt. Wer ihn kopiert, kann die darin gespeicherten Wörter wieder auslesen.

Also kein Foto fürs Handyalbum, nicht in die Cloud und nicht an den Support schicken.

Ein QR‑Code zum Empfangen ist etwas anderes; er enthält normalerweise nur die Zahlungsadresse.

Merke dir: Erst wissen, was im QR‑Code steckt, dann entscheiden, wer ihn sehen darf.

I’ve been testing Blitz Wallet over the past few weeks, and several features really stand out to me. ⚡️

First and foremost: contacts. I can save a Lightning address and send sats to the same person again later, even if they use a different compatible wallet.

What annoyed me about Blink was that contacts were limited to its own ecosystem. Here I store the address once and don’t have to request new payment details each time. That makes a difference when you actually use Bitcoin for payments.

I’m especially impressed with Nostr Wallet Connect. 👀 I can, for example, link Alby on my PC to my wallet and set separate permissions and budgets for each connection. What actions is the app allowed to perform? How much can it spend? I want to be able to define those settings myself, and Blitz is currently my favorite for that.

Sub‑accounts fit perfectly with this. I’ve already created a dedicated account for Wallet Connect, so I can separate funds for different purposes and keep track of everything. The personal sub‑accounts all rely on the same primary backup.

I also like the workflow with Specter: derive a unique seed for Blitz on the hardware wallet via BIP85, display it as a standard SeedQR code, and import it on the phone. 🛠️ BIP85 runs on the Specter, Blitz imports the derived seed, and I just need to remember or document the derivation index. This lets me restore the everyday wallet from my existing backup while the main seed stays on the hardware wallet.

The fact that Blitz is open source and that the fees are visible directly in the app is another plus. I want to be able to see how the wallet works and what costs are incurred while using it.

My test wasn’t completely smooth: the home screen felt cluttered in places, and some payments took a long time to load. The additional operator assumptions from Spark also need to be taken into account for me.

The combination of contacts, NWC, sub‑accounts, and the seed‑QR workflow is really exciting for small everyday amounts. There’s a lot of potential here that I’d like to keep exploring.

Are you already using Blitz? Which feature do you like best? ⚡️

Du kaufst drei Bitcoin‑Hardware‑Wallets. Bist du jetzt dreifach geschützt?

Nein, das ist nicht der Fall, wenn du deine Bitcoin auf die drei Geräte aufteilst.

Ja, wenn eines der Geräte kompromittiert oder verloren geht, hast du nicht alles verloren. Aber es ist nicht dreimal so sicher, sondern eher dreimal so wahrscheinlich, dass du ein bisschen Bitcoin verlierst, weil du jetzt auf drei Geräte achten musst.

Besser ist es, die drei Hardware‑Wallets für eine Multisignatur‑Wallet zu verwenden. Dabei verbindest du alle drei Geräte zu einer Master‑Wallet, in der all deine Bitcoin liegen. Für jede Zahlung benötigst du immer zwei der Hardware‑Wallets. Wenn du eines verlierst oder es gehackt wird, verlierst du keinen einzigen Satoshi.

Die Einrichtung ist aufwendiger und erfordert einen vollständigen Wiederherstellungsplan.

I just don't understand why everyone is using @walletofsatoshi.

It is not Opensource.

Why not go for @blinkbtc or @BlitzWalletApp ?

It's often simpel.

In my practical workshop yesterday, we had groups of two.

In one of the groups, one person had a simulated @SpecterDIY on their smartphone and the other had the @bitcoinKeeper_ app.

Together they made working Testnet transactions.

The LuganoPlan Conference was here.

Here’s exactly how you can get where I am as well, step by step:

What you get (nearly same practical status as locals):

• Live in Paraguay indefinitely (card renewed every 10 years)
• Cédula (Paraguayan ID)
• Work freely, open bank accounts, get a RUC, sign contracts, buy property, get utilities & driver’s licence
• Enter/leave freely (re-enter at least once every 3 years)
• Permanent Residency (make sure to not be off paraguay for more than 3 years)

What you don’t get:

• No Paraguayan passport
• Voting rights only in municipal elections (not national)
• No eligibility for most public offices
• Still subject to the 3-year absence rule

1. Prepare the documents in your home country

• Valid passport (at least 6 months validity recommended)
• Birth certificate (apostilled)
• Police clearance / criminal record (for presentation abroad) (apostilled; must not be too old when you submit)

2. Contact a imigration Helper Highly recommend starting with this before or while preparing the documents.

In theory this works without one, but I don't recommend it anybody. It will take a lot longer, you will need to find everything out yourself and need good spanisch.

I used @ParaguayProfis . If you message them, write them Schnuartz sent you. You don't pay extra but you support my work.

He will give you all the advice you need.

3. Cédula and Temporary Residency

• Bring everything mentioned + Do the staff your imigration helper told you
• Paraguay Profis will bring you to the imigration center.
• You need to do fingerprints, Foto, signature etc.

3-4 Month afterwards you will receive your Cédula (like a ID in Paraguay) + your temporary Residency. -> They can send it to you or you via post to your country / a trustworthy person picks it up and brings to you.

Both last for about 2 years.

Costs: €2,2k for migration helper (includes Cedula etc) + flight (€1k from Germany) + normal vaccation costs

4. Second trip (~365 days after the first one)

• Here the time Slot is very important. You do not want to risk to be more than 365 days outside of Paraguay. so try to set this trip exactly in the middle of the 3 trips you need to do.
• Before this trip contact your imigration helper to be sure you do everything right.
• It could be the case that some extra cost come here. Prepare €900
• Nothing special more, this is for having a stamp in your passport.

5. Third Trip (~365 days afterwards)

• Timeslot is very important as well. You have 90 day time window. BUT you don't want to be more than 365 days off Paraguay.
• Speak with your imigration Helper what you need before!
• Passport, Cedula, Residency, Police card (you will receive as well the last time) is minimum
• You are doing: New picture, new fingerprints and new signature
• You get: ->Permanent resedency for Paraguay (Here it's highly recommended to not be off Paraguay for more than 3 years. Otherwise it could taken from you in theory) -> New Cedula that last for 10 years
• You will receive both under the conditions like last time after 3-4 month
• Cost is €1,7k

(6.) Bonus: Paraguay Consulting

• There is Lia. A German YouTuber with 7k Subs.
• She is a female Bitcoiner and does consulting for migration etc. -> https://wohin-auswandern.com
• Tell her that I (Schnuartz) sent you to her. So you get 15% off

[I'm not a professional. Ask your immigration helper about the details. Do not trust ChatGPT or simple Google Search about that topic. The informations there are often misleading]

It's confirmed. In 3-4 month I will receive the permanent residency for Paraguay.

And a Cédula (like an ID) that will last 10 years until I need to extend it.

Hope I will never need it. https://blossom.primal.net/7651e5c45b1d53c40d23fee32dc0073c6ad324a74fbc751bce4266a61fd33d74.jpg

Gerade bin ich bei der Migrationsbehörde von Paraguay.

Ich werde probieren meine Temporäre Aufenthaltsgenehmigung in eine Permanente Aufenthaltsgenehmigung umzuwandeln.

Es sollte klappen. Trotzdem bin ich etwas nervös.

Running GrapheneOS https://blossom.primal.net/6ee7042505e13dd8931d9c9d901b43df4e7f74dce04acf0c2ed5c2ae1084a615.jpg

The Bitcoin Meetup Paraguay #11(1,5 years ago) was soo crazy.

More than 190 people registered.

They had a stage, sponsors, Bitcoin miner exhibition, entry wristbands, and I had a small booth.

Monthly Meetup. NOT Conference.

On 25 April 2025, I received my temporary residency for Paraguay.

I hope I will never need it; in one week I will try to change it into a permanent one.

The second time I went to paraguay, I took some Specter DIY components with me in my hand luggage.

My hope was that I would be able to find a local 3D Printing shop and conduct a Specter Shield Lite Assembly Workshop there.

Der Satoshi Rechner von Blocktrainer ist meine Lieblingsmöglichkeit um Satoshis in Euro umzurechnen. Was verwendet ihr?

https://www.blocktrainer.de/tools-services/satoshi-rechner

1,5 years ago I drove the first time bus in Paraguay.

Yes, German Busses are way cleaner. But it feels like the bus driver can decide how he want's his bus to look like.

This one had this nice Curtains.

How I recorded Bitcoin Content on Paraguay vaccation 1,5 years ago.

The first time I went to Paraguay alone, I orange-pilled a Paraguayan hotel.

I stayed at a small hotel, and in the evening, I talked to the owner in my poor Spanish, with the help of a translator.

In the end, I paid half of the hotel bill in Bitcoin to his new Blink wallet.

This is how much more SATS Routing charges compared to the discontinued Boltz Exchange.

10% off of Bitcoin Amsterdam Tickets if you use my Code: Clava10

See you there at the Opensource Hub🔥

Wie swappst du Bitcoin zwischen OnChain und Lightning, nachdem Boltz Exchange seine Swap-Dienste eingestellt hat? Ich teste SATS Routing mit Blink und der Bull Bitcoin Wallet und zeige beide Richtungen: Lightning → OnChain und OnChain → Lightning. Dazu gehören Empfangsadresse, Lightning-Invoice, Rettungsschlüssel und die Gebühren der beiden echten Test-Swaps. 🎥

I swapped Bitcoin Lightning into Bitcoin On-Chain and the other way round with SATS Routing.

The Boltz Exchange successor. This are the Fees I paid.

Das zweite mal als ich in Paraguay zu Besuch war habe ich einen dicken Regen miterlebt.

Eine Straße hat sich Buchstäblich in einen Fluss verwandelt und ein Laster ist stecken geblieben.

The Bitcoin swapping service BoltzExchange is dead; its successor is SATS Routing.

Lightning and Bitcoin work, and Liquid is under development.

What governments see when you run a basic Coinjoin for privacy.🤡

Bought myself a new Smartphone but I don't like Google.

What should I do with it? ;)

I think @bitcoinKeeper_ is the best Bitcoin Wallet to test stuff.

If you change it to testnet you can just click on "receive testnet coins". It just works.

I’m speaking at Security focused Bitcoin, pre-event the day before the @LuganoPlanB Conference, on October 22 in Lugano.

My talk: Why a Air-Gapped Hardware Wallet?

See you in Lugano

With @SpecterDIY, we established an air-gapped connection via QR code.

Helping with measurements to speed up the Specter DIY ESP32 P4 Port.

If you're a vibecoder looking for something useful to build for Jev:

Build a clean browser tab manager plugin that automatically understands which tabs belong to the same task and groups them together.

I would use this every single day.

We are very early.

Every time I want to make a Tutorial about a Bitcoin App I see something that should be fixed.

Logical Feature Request or Bug Fix.

You are only to allowed to choose one layout for your future @SpecterDIY. Which do you choose and why?

I’ve updated my offline web Bitcoin Inheritance Planner.

Now you can see a detailed graphical overview of your Bitcoin Security Setup.

I do not get why human readable BIP-39 Seedphrases are not a Standard for Nostr yet.

You could easily derive the Nostr Nsec from it and so you would help so many people trying to write their cryptografic nsec on paper.

With Specter DIY, we established an air-gapped connection via QR code.

I love BIP85.

I have 10+ Bitcoin seed phrases and even more wallets.

But it's enough to back up only one properly.

Highly appreciate!

I had a look at how many GitHub Stars different Hardware Wallet Projects have.

Nostr-Schlüssel kann man schon jetzt aus jeder Hardware Wallet ableiten die BIP85 unterstützt:

Dein eigener Blog scheitert nicht am Schreiben, sondern oft schon an Hosting, WordPress und laufenden Kosten.

Im neuen

Video zeige ich dir, wie du mit EINUNDZWANZIG Media ein Konto erstellst, einen Artikel schreibst und mit dem Nostr Protokoll veröffentlichst, andere Beiträge entdeckst sowie Bitcoin-Spenden über dein Profil empfängst.

Did you know that in 2018, while Specter DIY was still in early development, another DIY hardware wallet project was being built?

It used Trezor 's open-source codebase. Today, almost nobody knows about it.

PiTrezor adapted the Trezor One firmware to run on a Raspberry Pi.

https://www.pitrezor.com/2018/02/pitrezor-homemade-trezor-bitcoin-wallet.html

Hatte vor einem Jahr einen 21-Euro Schein verschenkt.

Die 14 Jährige hatte ihn bis heute in ihrer Handy-Hülle um ihn wo wenn möglich ihren Freundinnen zu zeigen.

Brauch nicht mehr sagen

Einige custodial Lightning Wallets von Blink wurden gehackt.

Alle Betroffenen bekommen ihr Geld von Blink erstattet.

Was able to connect the web Specter DIY Simulator I'm currently building with the Specter Desktop on my PC via simulated USB connection👀

Will release it soon https://blossom.primal.net/527423f16bf03c89cbd2d4c1ee6dfebffc9102c5c36a10b4316e1cd34ede5733.png

I’d love to see a proper Nostr-focused Postiz fork.

What I’m looking for:

• Proper detection of npubs, nprofiles, notes, nevents and other Nostr identifiers • Nostr-native media uploads using Primal’s Blossom server, e.g. blossom.primal.net • Store images and videos on Blossom instead of permanently keeping them on the self-hosted Postiz server • Auto-reposting when multiple Nostr accounts are connected, so one account can publish and selected other accounts automatically repost it • Automatically delete the local Postiz copy after the upload and Nostr post succeeded • Better relay configuration and generally deeper Nostr integration

Postiz already has basic Nostr support, but it still feels more like a generic social media integration than a truly Nostr-native implementation.

Does a good fork like this already exist, or is anyone interested in building one?

After my post someone sent me the simulator of mineracks which is amazing!

https://walletplayground.com

You can simulate:

• any Hardware Wallet
• any Software Wallet

And let them communicate on Signet. It is a bit buggy cause he probably has the VPS architecture I had in the beginning but the communication between the Hardware Wallet and companion App works very well.

Also probably it makes problems when to many people are using the site, as they are probably all using the same devices at the same time.😅

Highly recommend checking that out. https://blossom.primal.net/ced3dc2396e1d4519ec5f0fef479310a1212dd5703a55c4be3a470f9385c81ab.jpg

People use at least three different meanings of “Bitcoin Layer 2”:

1⃣Network L2: an interoperable protocol cryptographically pegged to Bitcoin in a trustless manner. It preserves Bitcoin’s peer-to-peer nature and disintermediated verifiability, and does not use IOUs.¹

2⃣Broader technical L2: a protocol that extends Bitcoin’s functionality. Bitcoin is locked on L1 and represented or used on L2. This can involve additional trust in centralized actors or network operators, with eventual settlement back to Bitcoin.²

Übersetzen mit DeepL 3⃣Monetary L2: any off-chain interaction that transfers a BTC balance from one entity to another, whether as an IOU or as actual ownership.¹

When I say “Bitcoin L2”, I mean definition #1.

Under that definition, I do not consider Liquid, Cashu, Fedimint, or Spark to be Bitcoin Layer 2s.

They can still be useful technologies built around Bitcoin. I just would not call them Bitcoin L2s.

¹ The Semantics of the Bitcoin Layers, Bitcoin Magazine bitcoinmagazine.com/culture/the-semantics-of-the-bitcoin-layers

² Bitcoin’s Layered Design: The Key to Greater Utility, Blockstream blog.blockstream.com/bitcoins-layered-design-the-key-to-greater-utility/

Bitsaga Rob built a SeedSigner Simulator in the browser.

I did the same for Specter DIY even month before. But my build was bad. It run the Specter as a simulator on a VPS and connected to the VPS to the browser. Allowing only 5 persons at once using it.

Never released it cause it was buggy. Only internally for testing the new Specter Firmware variations we are building.

But now I saw how elegant Rob had implemented it. I'm now also rebuilding mine on micropyhtong directly allowing to simulate SD-Card, QR-Scanner and Smartcards. Updates soon

Du kannst einfach deinen eigenen Blog super schnell über die

Nostr-Blogseite launchen.

Statt wie bei X musst du keinen Cent ausgeben und es wird all deinen Nostr Followern angezeigt. Und zwar auf allen Nostr Blog Plattformen.

https://media.einundzwanzig.space/

BitBox macht im Hintergrund im Grunde genau das, was ich seit zwei Jahren in meinen Videos empfehle:

Für eine neue Lightning-Wallet wird per BIP85 eine eigene Seedphrase aus dem Bitcoin-Seed der Hardware-Wallet abgeleitet. Das ging schon vor dem BitBox Update mit mit einigen Hardware Wallets inklusive Specter DIY

Ein Seed als Backup –> getrennte Seeds für getrennte Wallets.

Wir brauchen mehr Liquidität auf P2P Bitcoin Kauf Plattformen wie Bisq

Mit den 3 Angeboten kann man einfach nicht KYC frei Bitcoin kaufen.

My longest AI run so far: 16 hours.

I had it analyze all 80 open Specter DIY GitHub issues, research each one, assess relevance, suggest fixes, and cross-check related PRs. Result: 5 prototype PRs + a full issue/PR map.

https://github.com/cryptoadvance/specter-diy/issues/397

Zurzeit erweitere ich meinen Bitcoin‑Vererbungsplaner, damit er optional für fortgeschrittene Benutzer noch eine technischere Grafik des Setups anzeigt. Wo man dann alle Details noch einmal prägnanter auf einen Punkt bringen kann.

Habt ihr da Sachen, die ich unbedingt implementieren muss?

This might be the craziest open-source project I’ve seen in a while: imagine Google Earth with all the live data of the world out there, AI, and a JARVIS-like interface:

• See real Life flights (how fast position everything)
• also satellites and ships
• You can see floods
• You can see public cameras if available
• Social Media Posts that match the location
• it tells you knowledge about the stuff what you want and the areas you want from public information
• and you can speak with it like Iron Man speaks with Jarvis
• and then you can Fork it and add everything public extra data you have into it https://www.youtube.com/watch?v=o_FJ1NIH9yw

LFG! Wir übernehmen einfach!

If you want to write down your Seedphrase on paper.

Then please make sure to not use ordenary paper!

https://clavastack.com/products/terraphrase-paper

So kannst du den Bitcoin Gutschein den ich verschenkt habe selbst basteln.

Hinweis. Man muss selbst eine @lnbits Instanz hosten oder kennt jemanden der diese hostet. Anderenfalls werden die coins regelmäßig von den Konten geleert.

Orange Pill Starterpaket als Geburtstagsgeschenk.

Fehlt was?