Coinkite’s Substack

COLDCARD Co-Sign and Key Teleport

New COLDCARD Release: Many BIG features & Fixes!

Apr 22, 2025

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November 2023

Coinkite #BLACKFRIDAY sale started ! 🛍️🎉

Up to 25% OFF

Nov 22, 2023

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May 2023

Announcing: Edge Firmware [developer preview] for CC Mk4

If you are not a developer, you can ignore Edge version completely.

May 12, 2023 • Coinkite, DocHEX, and NVK

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March 2023

Meet Vivek: Your Go-To Expert for All Things Coinkite

Welcome to the Coinkite family!

Mar 24, 2023 • Coinkite

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February 2023

Huge Mk4 Release! Version 5.1.0

MicroSD as 2FA, Import TAPSIGNER as main/ephemeral seed, Detached sig for exports, App-specific deriv paths, Import/Export overhaul, incl Samourai…

Feb 27, 2023 • Coinkite, DocHEX, and NVK

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Meet the COLDCARD Q1

Uncompromising Security & Convenience: Full QWERTY Keyboard, Dedicated Function Keys, and Unbeatable MicroSD Power

Feb 9, 2023 • DocHEX, NVK, and Coinkite

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January 2023

Proof of Keys Vol 3. Final

On Breaking SHA256 FUD, Attack Surfaces of Computers, Bitcoin Binary Watch Bot, Quantum Computing & Multisig Grifters Attacks

Jan 20, 2023 • Coinkite and NVK

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Understanding The COLDCARD Mk4 Security Model and Secure Element Use

By Tristan Borges Solari (guest author)

Jan 16, 2023 • Coinkite

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Proof of Keys Vol. 2:

Multisig, Shamir Secret Sharing, Quorum Choices, Assisted Custody and How to Apply Diversity from a Security Mindset

Jan 13, 2023 • Coinkite and NVK

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Celebrating Bitcoin's 14th Birthday with Proof of Keys: Volume 1

Protect Your Bitcoin from User Error: Expert Insights on Demystifying Passphrases and Avoiding Common Mistakes

Jan 7, 2023 • Coinkite and NVK

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December 2022

Everything You Need To Know About Passphrases

A Brief on Private Keys & Wallets

Dec 21, 2022

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November 2022

Up to 25% off most Bitcoin security and fun devices

For the next 72 hours only

Nov 23, 2022 • Coinkite

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