The most secure, modular hardware wallet for your crypto. One shell, many keycards. Join our community: discord.gg/uJAXk7jFhZ
Switzerland
- Tweets 1,470
- Following 335
- Followers 4,183
- Likes 2,805
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👇
1
3
12
384
Keycard Shell retweeted
Keycard Shell Review 2026 – Modular Air-Gapped Hardware Wallet
piped.video/watch?v=uQrKg-sW…
#Keycard #Coldwallet #Cryptowallet @Keycard_
2
4
112
ambire + keycard are a great combo
👀 @glgrau creates and signs a 2/2 Safe multisig transaction with Keycard Shell in Ambire.
6
24
804
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…
5
14
78
2,685
that's the beauty of open source development
Work that came from this prototype was merged upstream to @Keycard_ !!!🥳 github.com/keycard-tech/keyc…
2
4
17
1,005
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/…
2
6
315
Keycard Shell retweeted
Or just move to something that's already transparent and open source - @Keycard_
3
16
1,912
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
8
4
45
2,481
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
9
12
98
28,050
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!
1
1
19
887
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…
1
10
467
Keycard Shell retweeted
Another key benefit of @Keycard_ it’s a clear case. So easy to double check the insides
1
1
14
517
Keycard Shell retweeted
Mobile app supports @Keycard_ NFC signing.
Just tap your Keycard to your phone and complete transactions on the go.
7
53
3,109
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
2
6
26
923
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…
5
2
17
1,117
Scan in
Verify
Sign
Scan out
Your signing device never needs to connect to your computer.
5
4
26
1,214
Keycard Shell retweeted
This is the feature that actually stops people getting rekt.
Sync extension and mobile without copy-pasting your seed phrase or private key.
It will be available on @ambire 🔥
Bring your extension accounts to the mobile app and vice versa.
The sync feature lets you transfer your accounts without copy-pasting sensitive seed phrases and private keys.
Sync, don't copy-paste.
4
3
15
532
Keycard Shell retweeted
dont even touch your private key on online devices and use @Keycard_ shell
1
1
8
122
Keycard Shell retweeted
LFG. Full @Keycard_ → OpenPGP → @ThurinLabs → Ethereum demo.
OpenPGP signs the identity statement. Ethereum signs the EIP-712 authorization. Everything moves over QR, both proofs verify on the host, and neither private key leaves the card.
Hardware-backed identity is real.
16
12
23
1,718