The most secure, modular hardware wallet for your crypto. One shell, many keycards. Join our community: https://xitter.cf/t.co/pMHQxid209
Switzerland
Joined January 2019
- Tweets1.5K
- Following337
- Followers4.2K
- Likes2.8K
Keycard Shell retweeted
Tangem is not a hardware wallet (it doesn't bring more security than a mobile phone) and all cards are at risk see donjon.ledger.com/blog/bypas… - if you like the form factor check out @Keycard_ or @satochip
Keycard Shell retweeted
🔥 I ranked 21 Bitcoin signers.
5 years in the shadows: testing hardware wallets, watching Bitcoin Twitter, following every hack, every bug, every vendor drama.
This is where I landed, & some of you won't like it.
My criteria:
🔓 Open code you can verify
📵 Air-gap: QR or microSD over USB, Bluetooth or NFC
🧱 Security model: secure element, stateless or smartcard
📜 Track record, and how the vendor reacts when things break
🔁 Standard backups (BIP39, PSBT, descriptors): no lock-in
🟥 S TIER
Open code, minimal trust in a vendor, and for most of them you can build or flash it yourself. The less you have to trust, the higher it goes.
🟧 A TIER
Serious, Bitcoin-focused tools. You trust the vendor more than in S, and you get polish in return. Yes, Coldcard stays in A after July's entropy bug. The transparent fix and migration guide count too.
🟨 B TIER
Good tools, each with a trade-off: a server in the security model, a newer approach still proving itself, a phone in the loop, or multi-coin roots.
🟩 C TIER
Multi-coin first, Bitcoin second.
⬜ D TIER
Closed code, or recovery models where a company holds part of the keys to your castle.
Now the twist: no signer is the best in the absolute. The right one depends on YOUR threat model. A ranking expires. A method doesn't.
That's the whole idea behind chapter 23 of Bitcoin Hodler: Choosing Your Signer. 📖
Where would you move one device? 👇
ALT https://kavsec.agency
Keycard Shell retweeted
Mis primeras impresiones de @Keycard_ 👇
Antes un resumen de porque la elegí:
• Es una mezcla de @Tangem y @KeystoneWallet
• Firmás con NFC o con QR
• Con QR ves en la pantalla del Shell lo que estás firmando
• La wallet de la tarjeta la podés borrar y generar otra, cada una te da su seed
• Todo open source
Existen más cosas, que no dejan de ser importante, pero no quería hacer un post muy largo, vayan a visitar su web 😉
Wallet con las cuales pueden usarla:
• Para redes EVM pueden usarla junto a @ambire, con QR en la extensión y NFC/QR en el celular, realmente el uso en muy fluido. Existen más opciones por ejemplo @Rabby_io, pero solo es con QR.
• Para BTC @SparrowWallet / @bluewalletio son opciones, pero existen más, en todas es solo con QR
Posibilidades:
• Una wallet diaria que pueden usar con Ambire por NFC
• Una wallet con fondos para hold para usar solo QR, viendo que se firma gracias al Shell
• Firmante de una @safe
Para mí es una muy buena opción, pero por supuesto nunca dejen de hacer ustedes su propia investigación, cualquier cosa preguntan 🫡
Keycard Shell retweeted
Your Nostr key, on a @Keycard_.
keycard-nostr-bunker is a NIP-46 bunker: clients connect over relays, the card signs and decrypts. The key never leaves it.
pipx install keycard-nostr-bunker
github.com/mmlado/keycard-no…
#nostr #NIP46 #Keycard #selfcustody #hardwarewallet #opensource
you should be more like @alisher
What does a stack built around resilient, user-controlled technology look like?
Take inspiration from @alisher of @Logos_network:
Hardware → @FrameworkPuter
Browser → @brave
Messenger → @ethstatus
Documents → @fileverse
Decentralized storage → @Codex_storage
Hardware wallet → @Keycard_
Email → @ProtonPrivacy
P2P sharing → @qbittorrent
Notes and knowledge → @anytype
Self-hosted media → @jellyfin
Music → MusicBee
Graphics → GIMP
Image upscaling → @upscayl
Reading → Calibre
Audio → Equalizer APO
Explore Alisher’s complete stack:
stacks.web3privacy.info/stac…
Running separate seeds doesn’t have to mean juggling wallet extensions
with Keycard Shell and @ambire , you can keep accounts from different seeds in one extension and switch between them as needed
each seed stays on its own Keycard
here’s how:
• insert your first card and enter its PIN
• select Connect Software Wallet → Ethereum
• scan the QR in Ambire, select an account and name it
• repeat with your next card
choose the account in Ambire, insert the corresponding card into Shell when you need to sign
separate seeds, without a separate workflow for each👇
Keycard Shell retweeted
Keycard Shell Review 2026 – Modular Air-Gapped Hardware Wallet
youtube.com/watch?v=uQrKg-sW…
#Keycard #Coldwallet #Cryptowallet @Keycard_
Transparency beats trust. So we made Shell hardware easy to verify.
Here are videos and pictures to help you check the integrity of your Shell:
docs.keycard.tech/en/help/ch…
that's the beauty of open source development
Work that came from this prototype was merged upstream to @Keycard_ !!!🥳 github.com/keycard-tech/keyc…
Keycard Shell retweeted
Keycard Shell 1.4.0 firmware: reproducible ✅
We rebuilt it from source. The firmware matches apart from its signature, and this release's newly published bootloader matches byte for byte once its key field is copied in.
Congrats @Keycard_ @WalletScrutiny
walletscrutiny.com/hardware/…
Keycard Shell retweeted
Or just move to something that's already transparent and open source - @Keycard_
Keycard Shell retweeted
Keycard is a huge underdog!
- Overall works great, very easy, simple, self-explanatory
- Solid build quality
- Interchangeable secure elements (cards)
- Super open wrt software and hardware & schematics even..
- Cheap!
Recommended!
Product link in comment
if there’s an extra component inside your hardware wallet, what reference do you have to spot it?
with Keycard Shell, you have a published reference for what should be inside
Firmware. Circuit schematics. PCB layouts. Component lists. Case designs.
here’s the hardware behind it:
• main board with STM32H573 (ARM Cortex-M33) microcontroller (PSA Level 3 / SESIP3 certified)
• 240×320 TFT IPS color LCD screen
• heavy-duty silicone keypad (numeric + OK/C)
• ISO 7816 smartcard reader module (contact only)
• CMOS global-shutter camera for QR codes
• replaceable Nokia BL-4C 800 mAh battery
• clear ABS case, with public 3D design files so you can print your own
the clear case lets you see parts of the board without taking the device apart
the back cover slides off without tools to access and replace the battery
if there’s an extra component inside your hardware wallet, what reference do you have to spot it?
with Keycard Shell, you have a published reference for what should be inside
Firmware. Circuit schematics. PCB layouts. Component lists. Case designs.
here’s the hardware behind it:
• main board with STM32H573 (ARM Cortex-M33) microcontroller (PSA Level 3 / SESIP3 certified)
• 240×320 TFT IPS color LCD screen
• heavy-duty silicone keypad (numeric + OK/C)
• ISO 7816 smartcard reader module (contact only)
• CMOS global-shutter camera for QR codes
• replaceable Nokia BL-4C 800 mAh battery
• clear ABS case, with public 3D design files so you can print your own
the clear case lets you see parts of the board without taking the device apart
the back cover slides off without tools to access and replace the battery
and where are your private keys?
on the separate Keycard, inside its NXP JCOP4 P71 JavaCard secure element, certified to EAL6+.
and the best part is Shell does not store them!
the design is open for closer inspection, too. Our MIT-licensed repository includes:
• schematics in PDF and editable formats.
• PCB layouts and Gerber files.
• bill of materials.
• mechanical 3D STEP files for the case.
• certification documents.
• firmware source and build instructions.
you don’t have to wait for someone else’s teardown to learn how Shell is built. You can examine the files, inspect the device and even build your own.
Explore the hardware files under hardware/shell/serial_run:
github.com/keycard-tech/keyc…
Full hardware specifications:
docs.keycard.tech/en/develop…
Keycard Shell retweeted
Another key benefit of @Keycard_ it’s a clear case. So easy to double check the insides
Keycard Shell retweeted
Mobile app supports @Keycard_ NFC signing.
Just tap your Keycard to your phone and complete transactions on the go.
Keycard Shell retweeted
Safe is making it easier and more secure to use with @safe Pro
Start a project with your email and upgrade ownership as you grow with more people and adding fully owned software and device account signers like @ambire and @Keycard_
• See all accounts in 1 Workspace
• Safenet transaction tx verification network as a security layer
• As simple or customized as needed
I'm most looking forward to a version of Safe Pro for individuals with multiple accounts that has features like gasless txs, Safenet, and access controls
Safe Pro is live: the most professional way to self-custody.
If self-custody has become critical for your team, @Safe Pro was built for you.
❇️ Oversee all your Safe accounts in one Workspace
❇️ Monitor transactions continuously with Security Hub
❇️ Implement policy controls on every transaction.
Your assets never leave your custody.
Check out our new website and get Safe Pro now: safe.global/pro
want to contribute anon?
come help build open source + open standards self custody
Help wanted! Get @Keycard_ Pal into fdroid.
You can read more about it in this issue: github.com/mmlado/keycard-pa…
