The 1st Bitcoin Bearer Bond or just call it a "Bitcoin Stick"

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Version 3.1.4 Released (BIP-8...

Version 3.1.4 Released (BIP-85 added / BIP-143 defences)
Security Fix (BIP-143 replay attack) Jun 12, 2020Read Post

BIP-143 Vulnerability

BIP-143 Vulnerability
A security researcher has reportedan attack leveraging an knownissue with how BIP-143 commits to segwit inputs.If malwareis in a position to tamper with your PSBT data, and it can... Jun 3, 2020Read Post

Laser Fault Injection

Laser Fault Injection
Ledger’s Donjon lab has posted anew security report regarding the older Coldcard  Mk2 .It’s an amazing report, and very exciting to see theextreme level of resources put... May 18, 2020Read Post

SEEDPLATE Bitcoin metal backup

SEEDPLATE Bitcoin metal backup
May 5, 2020Read Post

Coldcard firmware update: 3.1.3

Coldcard firmware update: 3.1.3
Apr 30, 2020Read Post

COLDPOWER 9volt Battery to USB

COLDPOWER 9volt Battery to USB
Apr 1, 2020Read Post

Blockclock Firmware updated

Blockclock Firmware updated
Firmware Upgrade Time! Mar 30, 2020Read Post

Supply Chain Trust Minimized

Supply Chain Trust Minimized
Just getting a legit Coldcard into your hands is the hard partsometimes—not just with international shipping and customsshenanigans. Mar 2, 2020Read Post

Version 3.0.6 Released (Secur...

Version 3.0.6 Released (Security Update)
Security Fix (Multisig Users) Dec 19, 2019Read Post

Login Countdown and Nickname

Login Countdown and Nickname
With 3.0.3 release we have two new optional features, Login Countdown and Device Nickname. Nov 6, 2019Read Post

Troublesome Change Outputs

Troublesome Change Outputs
Nov 1, 2019Read Post

Coldcard Hardware Details

Coldcard Hardware Details
Today we have posted all the information you need to be able tobuild your own Coldcard from off-the-shelf parts. We are sharingthis information for the benefit of security resear... Oct 25, 2019Read Post