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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


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)

Sep 2, 2021

Version 4.1.2 Released (More QR Codes)

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

Some Other

Dec 28, 2018

Coldcard Firmware 1.1.0

Nov 26, 2018

Coldcard Firmware 1.0.1

Sep 5, 2018

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 ( 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