@Keycard_
Account based inFrance
About this account
- Account based in
- France
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- India App Store
Account-level information from X, not a live location or the device used for a specific post.
The most secure, modular hardware wallet for your crypto. One shell, many keycards. Join our community: https://nitter.cf/t.co/pMHQxid209
Switzerland
Joined January 2019
- Tweets1.4K
- Following335
- Followers4.1K
- Likes2.6K
Pinned Tweet
@ambire this is an incredible mix of security and ease of use ❤️
and ... for the verifiability maxis they can also build their own keycard from source themselves
for humans: grab the GitHub repo, verify the source, and flash any JavaCard
for agents: point your agent to the repo, request a code audit, and let it use the skills to flash a card autonomously
docs.keycard.tech/en/develop…
github.com/keycard-tech/stat…
We fully back Keycard Pal app which is one of the most interesting community owned app for @keycard_
We've tested it in depth and use it daily now
It's a great step for @keycard_ holders who can now use their Keycard with a NFC tap with any QR code based software wallets (more than 20+ wallets on ethereum, EVMs, and Bitcoin)
Keycard Pal is live on Google Play.
Tap your @Keycard_ card to sign. The keys never leave the card. The phone is just the screen.
play.google.com/store/apps/d…
#hardwarewallet #selfcustody #Android #NFC #opensource
Keycard Shell retweeted
@Keycard_ and @we_satoshis killer combo! No phone, no computer, no problem!
#btc #bitcoin #coldwallet #keycard #wesatoshis #sats
Keycard Shell retweeted
Outside the workshop I'll be in the @Logos_network Attic some of the time.
If you want to see an air-gapped signature start to finish on your own phone, find me there and ask. 1-on-1, no slides, as many times as people want.
#DarkPrague #opensource
If you're in Prague on 2-4 October, this workshop by @mmlado is highly recommended
Running a workshop at @InstituteCrypto's #DarkPrague, 2-4 Oct.
Every #hardwarewallet says your keys never leave the device. On a @Keycard_ card that is false exactly once. Come see when, hands on.
Bring a laptop, an NFC phone, a free pocket.
#selfcustody #airgap #cypherpunk
Your agent can propose a transaction. It can't sign one.
Your keys stay in the secure element. Keycard Shell decodes the transaction on its own screen, and nothing happens until you enter your PIN and press OK.
You can set this up in 2 minutes with a MCP.
Even better you could use @keycard_ Shell hardware wallet with Claude
Your private keys never leave the secure element and the trusted display decodes your transactions
This takes 2 minutes to setup with Shell MCP
github.com/guylouis/keycard-…
Keycard Shell retweeted
Even better you could use @keycard_ Shell hardware wallet with Claude
Your private keys never leave the secure element and the trusted display decodes your transactions
This takes 2 minutes to setup with Shell MCP
github.com/guylouis/keycard-…
Keycard Shell retweeted
I'm going to @InstituteCrypto's #DarkPrague, 2-4 October.
Bringing @Keycard_ cards, two Keycard Shells and an air-gapped wallet. Find me in the @Logos_network Attic if you want to watch a transaction get signed with no network anywhere near the key.
#selfcustody #privacy
Keycard Shell retweeted
Keycard Shell firmware v1.4.0 released by @Keycard_
Release notes: github.com/keycard-tech/keyc…
Discover and compare the Best Bitcoin Hardware Wallets. thebitcoinhole.com/hardware-…
Experts say: spread assets across multiple hardware wallets.
Most people's solution? Buy 3 wallets 😵💫
The smarter move?
Use separate Keycard
→ Savings seed = one Keycard
→ DeFi seed = another Keycard
→ Daily wallet = another Keycard
⬇️
Each card is its own BIP-32 wallet with its own seed and PIN.
Best part about this is one Shell can work with unlimited Keycards.
So you get the convenience of one signing interface without putting every key inside the same piece of hardware.
Keycard Shell v1.4.0 firmware is ready with
- bitcoin multisig descriptors management
- btc address verification by QR scan
- improved device verification UI
You can update your Shell firmware in air gapped mode, or with your browser. See shell.keycard.tech/update
github.com/keycard-tech/keyc…
Keycard Shell retweeted
we are pro-stack, not 1 silver bullet.
It helps to use different tools, practices depending on personal & collective context. Especially, when tech products can ship for years.
Sometimes all they need is one convincing message.
the right sender
the right branding
a reason to act fast
that’s why never treat an email as the source of truth for your wallet.
Verify independently. Keep recovery material offline.
Sign only what you can verify
Our third-party e-mail provider has been breached. Please be aware that the email named ‘Critical Security Alert: STM32 Entropy Vulnerability’ is not coming from us, and it’s a phishing attempt. Do not click on any link.
We have taken down the domain, and we are investigating the situation, including how the hackers got access to our legit domain.
Keycard Shell retweeted
Warum 150 € für eine Hardware Wallet ausgeben, wenn du schon für 50–70 € Secure Element, Display oder Air-Gap bekommen kannst?
Genau das ist für mich die entscheidende Frage im Mid-Budget-Vergleich.
12 Wallets. 7 Kategorien. Und am Ende zählt vor allem: Ist der Aufpreis wirklich gerechtfertigt?
@Tangem @RyderWallet @ELLIPAL @Ledger @SafePal @SecuXwallet @KeystoneWallet @BitBoxSwiss @Trezor @OneKeyHQ @Keycard_
Most self-custody setups don’t fail because cryptography breaks.
They fail because too much depends on one thing.
One key
One device
One location
Keycard was designed so you can separate those risks.
🏭 Everything depends on one device?
Your key isn’t tied to the Shell.
The private key lives on the Keycard itself. Shell is the interface used to review and sign.
One Shell can work with unlimited Keycards, and your cards can be used independently of a specific Shell.
📍 Everything sits in one place?
Cards are small, battery-free signers.
Keep independent multisig cards in different physical locations instead of storing every signing key beside the same device.
A 2-of-3 setup can look like:
Keycard A → home
Keycard B → another location
Keycard C → another location
Lose one card? You still have quorum.
Lose one Shell? Your keys are still on the cards.
One failure shouldn’t mean losing everything.