COLDCARD 5.5.1 and 1.4.1Q
New COLDCARD Release: Versions 5.5.1 (Mk4/Mk5) and 1.4.1Q (Q)
Jul 2, 2026
Paper spam attempts
Remember letterhead? Now it’s the Newest Affinity Scam!
Jun 24, 2026
OPENDIME Turns 10: A Decade of Real, Physical Bitcoin
Well, it finally happened. Our little USB stick that could is officially a decade old this month....
Jun 1, 2026
Introducing the COLDCARD Mk5
The Mk4 is a proven workhorse. It’s secure, it’s air-gapped, and it gets the job done. But engine...
Mar 10, 2026
BIP-322 Support, WIF Keys, and more!
New COLDCARD Feature Release: BIP-322 and WIF Support
Mar 5, 2026
COLDCARD Bitcoin Spending Policy Released
New COLDCARD Feature Release: Spending Policies!
Sep 29, 2025
Earn Sats Straight to Cold Storage with Zaprite and COLDCARD
Earn Sats Straight to Cold Storage with Zaprite and COLDCARD
Sep 9, 2025
Coldcard Cosign and Key Teleport
New COLDCARD Release: Many BIG features & Fixes!
Apr 17, 2025
New COLDCARD EDGE Version Released
New COLDCARD EDGE Release: Versions 6.3.5X (Mk4) and 6.3.5QX (Q).
Feb 19, 2025
New Release: Signing and Address Display
New COLDCARD Release: Versions 5.4.1 (Mk4) and 1.3.1 (Q)
Feb 13, 2025
New COLDCARD EDGE Version Released
New COLDCARD EDGE Release: Versions 6.3.4X (Mk4) and 6.3.4QX (Q).
Dec 18, 2024
Blockclock MINI/MICRO Update with BitcoinTreasuries.net
New MINI and MICRO Firmware, and BitcoinTreasuries.net
Dec 13, 2024
Performance and Fixes
New COLDCARD Release: Versions 5.4.0 (Mk4) and 1.3.0 (Q)
Sep 12, 2024
New COLDCARD EDGE Version Released
New COLDCARD EDGE Release: Versions 5.3.3X (Mk4) and 1.2.3QX (Q)
Jul 8, 2024
NFC PushTx and More Updates
New COLDCARD Release: Versions 5.3.2 (Mk4) and 1.2.2 (Q)
Jun 26, 2024
Version 5.2.1 for Mk4 Released
New Mk4 Release: Version 5.2.1 (now 5.2.2)
Dec 19, 2023
Corporate Adoption of TAPSIGNER for 2-Factor Authentication
Corporate Adoption of TAPSIGNER for 2-Factor Authentication
Oct 27, 2023
Version 5.2.0 for Mk4: Seed Vault
New Mk4 Release: Version 5.2.0
Oct 10, 2023
Version 5.1.4 for Mk4 Released
Bugfix and Enhancement Mk4 Release: Version 5.1.4 (was 5.1.3)
Sep 8, 2023
Donjon Faults SE2 on Mk4
Ledger’s Donjon lab has released anew presentation on Laser Fault Injection against the DS28C36B ...
Sep 7, 2023
Edge Firmware [developer preview] for Mk4
Announcing: Edge Firmware for Coldcard Mk4
May 12, 2023
Version 5.1.2 for Mk4 Released
Minor Mk4 Release: Version 5.1.2
Apr 7, 2023
Version 5.1.0 for Mk4 Released
Huge Mk4 Release! Version 5.1.1 (was 5.1.0)
Feb 27, 2023
COLDCARD Q1 Early-Bird reservation starts now.
Meet the COLDCARD Q1
Feb 9, 2023
Understanding The COLDCARD Mk4 Security Model and Secure Element Use
Understanding The COLDCARD Mk4 Security Model and Secure Element Use
Jan 10, 2023
Everything You Need To Know About Passphrases
A Brief on Private Keys & Wallets
Nov 25, 2022
Version 5.0.6 Security Update (Virtual Disk)
Version 5.0.6 Security Update for Virtual Disk
Jul 29, 2022
Announcing SATSCARD & TAPSIGNER
Announcing SATSCARD & TAPSIGNER
Jan 24, 2022
COLDCARD Mk4 Early-Bird reservation ( $40 OFF) starts now.
Excited to announce the Early Bird reservation of COLDCARD Mk4, get $40 off as many units as you’...
Jan 23, 2022
Version 4.1.3 Released (PSBT support in Core)
Enhancements
Sep 2, 2021
Version 4.1.2 Released (More QR Codes)
Enhancements
Jul 28, 2021
Version 4.1.0 Released (Seed XOR Feature)
Apr 29, 2021
Version 4.0.2 Released (Countdown to Brick feature)
New feature: “Countdown to Brick”
Apr 7, 2021
Version 4.0.0 Released (Major Internal Improvements)
All New Code, Same Great Features
Mar 17, 2021
Version 3.2.2 Update Recommended (Multisig Security Update)
Security Fix (Multisig Users)
Feb 9, 2021
Version 3.2.2 Released (Major Address Explorer Improvements)
Major Multisig Improvements!
Jan 14, 2021
Version 3.2.1 Released (Major Multisig Enhancements)
Major Multisig Improvements!
Jan 8, 2021
Testnet Considered Useful
The Aledged Problem
Nov 24, 2020
Version 3.1.8 Released (Lots of enhancements)
Major Performance Boosts!
Aug 4, 2020
Version 3.1.4 Released (BIP-85 added / BIP-143 defences)
Security Fix (BIP-143 replay attack)
Jun 12, 2020
BIP-143 Vulnerability
A security researcher has reportedan attack leveraging an knownissue with how BIP-143 commits to ...
Jun 3, 2020
Laser Fault Injection
Ledger’s Donjon lab has posted anew security report regarding the older Coldcard Mk2 ....
May 18, 2020
SEEDPLATE Bitcoin metal backup
May 5, 2020
Coldcard firmware update: 3.1.3
Apr 30, 2020
COLDPOWER 9volt Battery to USB
Apr 1, 2020
Blockclock Firmware updated
Firmware Upgrade Time!
Mar 30, 2020
Version 3.0.6 Released (Security Update)
Security Fix (Multisig Users)
Dec 19, 2019
Login Countdown and Nickname
With 3.0.3 release we have two new optional features, Login Countdown and Device Nickname.
Nov 6, 2019
Troublesome Change Outputs
Nov 1, 2019
Coldcard Hardware Details
Today we have posted all the information you need to be able tobuild your own Coldcard from off-t...
Oct 25, 2019
Coldcard Address Explorer
Firmware update for powerful new feature: "The Address Explorer"
Oct 8, 2019
Coldcard™ Mark 3 Announcement
Aug 26, 2019
Possible Information Leak, Considered Unlikely
Aug 7, 2019
Keep Your Pins Long, and Your Peace of Mind Intact
Jan 28, 2019
Announcing: Coldcard™
The World Needs An Open, Cheap & Ultrasecure Hardware Wallet! Pre-Order Now
Dec 8, 2017
Announcing: Opendime V3
You might have noticed that the Opendime store is out-of-stock.
Aug 22, 2017
Opendime V2: Cyberpunk Credsticks Return
The OpenDime (OpenDime.com) is one of those projects which really captures the imagination. Lik...
May 20, 2017
Announcing: Chrome Extension for Opendime
Just as we were finalizing the firmware for V2 of Opendime(now shipping, by the way) we discovere...
Mar 8, 2017
Announcing: Opendime v2 – Now Genuine Verified Bitcoin Credit Stick
Opendime is a small USB stick that allows you to spend Bitcoin like a dollar bill. Pass it along ...
Dec 27, 2016
Real Life Cyberpunk Cred Sticks: Opendime
If there’s ever any doubt that we’re currently living in a cyberpunk world, then the OpenDime (...
Sep 14, 2016
The Bitcoin Game Interview With Opendime Team
Hello, welcome to episode 38 of The Bitcoin Game. I’m Rob Mitchell.It’s always great interviewi...
Aug 21, 2016
Exquisite Opendime
When we first read about OpenDime, the hardware Bitcoin Wallet, we were exited by what they app...
Aug 5, 2016
Friends of Satoshi Opendime Video: The Zero-Trust Bitcoin Stick
The 1st Bitcoin Bearer Bond or just call it a “Bitcoin Stick”.
Aug 4, 2016
Multiple Languages on Opendime Interface
Since Opendime v1.1 multiple languages are supported right in the User Interface. 中文 🇨🇳, 日本語 🇯🇵, ...
Aug 1, 2016
Opendime Unboxings!
Opendime is a new way to transact Bitcoin in physical form. It’s basically a bearer bond for Bitc...
May 6, 2016
Video: World's First Bitcoin Bearer Bond–A Bitcoin Stick!
Watch a demo of the world’s first bitcoin bearer bond–a bitcoin stick! Opendime is a small USB st...
Apr 27, 2016
