Coinkite Newsletter: Bitcoin Security, COLDCARD Updates & Key Research

COLDCARD 5.5.1 and 1.4.1Q

New COLDCARD Release: Versions 5.5.1 (Mk4/Mk5) and 1.4.1 (Q)

Everything You Need To Know About Passphrases

A Brief on Private Keys & Wallets

COLDCARD Firmware 5.6.3 & 1.5.3Q: Codex32 and Shamir Backups

Codex32 Shamir backups, Seed Vault names for temporary seeds, expanded PSBTv2 support, and stronger signing and firmware safeguards.

COLDCARD Firmware Update 5.6.2 & 1.5.2Q

Verifiable Seed Mixing; Continued Security Review; and EDGE 6.6.1X/6.6.1QX

COLDCARD Security Update: Seed Generation, Transaction Integrity, and Data Isolation

COLDCARD Mk4, Mk5, and Q users upgrade to firmware 5.6.1 for Mk4/Mk5 and 1.5.1Q

Monitor the Coinkite Blog for Security Updates

Official, timestamped COLDCARD advisories, firmware notices, and migration guidance.

One COLDCARD, Many Wallets: Better Backups with BIP-85

Use COLDCARD BIP-85 to derive separate child seeds for compatible wallets, reduce seed-backup sprawl, and keep the parent seed off every destination device.

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