Had a look at the @Keycard_ Shell. Great option to split hardware in such a way as to remove vendor trust. (Works great with DIY flashed Javacard) youtu.be/5NPP4c0D2FM Core functionally of my @SeedSigner fork (Shieldsigner) but available to normal folk as a retail offering :)

Kern dynamic UI taking shape. And it's getting unique and beautiful under the hood too.

Shout out to @YTCryptoGuide for the FOSS tool that helped @claudeai to recover the lost #Bitcoin

The developments happening around @SeedSigner's software and hardware are really exciting right now; @Printer_Gobrrr, @xmrstreet and @YTCryptoGuide have all leveraged their unique skills (software development, PCB design, CAD, 3d-printing) to innovate on top of the project. 🧡

Unsolicited feedback on a SeedSigner Smart Card / ShieldSigner purchased from @btc_hardware. 🧡

KEF encrypted mnemonic QR codes interoperability loop test: Krux -> SeedSigner (fork) SeedSigner -> Kern Kern -> Krux Different devices, libraries, and languages seamlessly handling a shared encryption envelope format.

Our FOSH approach to the @SeedSigner board is already bearing fruit, kudos to @YTCryptoGuide for porting the initial board specs to KiCAD, and to @xmrstreet for adding Smart Card ports to the design. Original reference design files can be found at: github.com/SeedSigner/hardwa…

Smart Card-Compatible SeedSigner kits/signers are now available in the shop. Still considered experimental and for devs/advanced users, but I continue to hear from people who are intrigued by the Satochip/Satodime/Seedkeeper functionality. btc-hardware-solutions.squar…

Traveling to Brazil, Japan and Korea last month has made me realize that I really need to level up my game in terms of the @SeedSigner hardware profiles that I offer in my @btc_hardware shop. Am working on adding @Kayth21's push case, a transparent resin enclosure option (h/t @bitkitBTC/@jikkeyBTC), and a signer with @YTCryptoGuide's smartcard functionality. It will take some time to pull things together, but I really appreciate all of these builders for pushing things forward and creating such great new physical interfaces for SeedSigner. 🧡

Review of the @BitBoxSwiss Bitbox02 Nova, finally adding support for iPhone users. I also added the ability to import the MicroSD backups into my fork of Seedsigner for offline recovery if neded :) youtu.be/zFa_owkxJNI

no pope, no president, no ceo only entropy, solder, open-source ethos behold the DIY signer trinity: @SpecterDIY @SeedSigner @selfcustodykrux

ACK AND I FORGOT I also have the @YTCryptoGuide fork of @SeedSigner to run Javacards and @satochip! How could I forget, I was just helping @Bitcoineando21's workshop to build these! Plus my @SpecterDIY is smartcard enabled. And I got the new wonder-k K210.

Cross collaboration between @selfcustodykrux @SeedSigner and @SpecterDIY! Results of our @casavinteum retreat, made possible by @Vinteum_org and @HRF

Love the new open source @SeedSigner with the fork from @YTCryptoGuide to use @satochip seedkeeper to securely store encrypted seeds, passphrases or masterpasswords from password managers. Build and shipped by @xmrstreet

Video covers @YTCryptoGuide's experimental smartcard fork, but also provides a good overview of SeedSigner more generally. 🙂 youtube.com/watch?v=EgjCzdCw…

Now in stock: The SeedSigner Smartcard Hat Kit A seamless extension for your SeedSigner that brings smartcard integration to your setup. Designed for enthusiasts and power users who prioritize secure, offline bitcoin storage, this kit unlocks new ways to manage and protect your corn with enhanced hardware capabilities. At the heart of the kit is the dual-slot Smartcard Hat, which slots effortlessly between your Raspberry Pi Zero and the display hat. It provides a CCID/PCSC-compatible interface with slots for both standard ID-1 cards (like bank cards) and smaller ID-000 SIM-sized cards, plus a handy USB-C port for power. Rounding out the package is a versatile DIY JavaCard smartcard, shipped unlocked with default keys, ready for you to load applets directly via your SeedSigner. It's compatible with both contact and NFC interfaces for flexible use. This combination of SeedSigner and smartcards opens up powerful possibilities for bitcoin cold storage. Imagine signing transactions and verifying PSBTs offline using your @satochip or the included DIY card, all while maintaining air-gapped security. You can easily sign messages, export xpubs for single or multisig configurations, and integrate with address explorers for better oversight. With Seedkeeper from SatoChip, managing seeds, wallet descriptors, and secrets becomes straightforward—supporting Electrum-style seeds, split passphrases, and even encrypted QR codes for added layers of protection. Whether you're building a robust multisig setup or simply want more options for your offline storage, the Smartcard Hat Kit adds many interesting possibilites to and already highly capable device. Get yours today and take your @SeedSigner to the next level! Link below. P.S. Shoutout to @YTCryptoGuide and @satochip for making this possible! 🙏

Krux v25.09.0 released! Powerful encryption tools and lots of UI and performance improvements! github.com/selfcustody/krux/…