COLDCARD Mk4 Firmware 5.2.0 release 🍄⏫ ## **TL;DR**: First #bitcoin Singing-Device to store MULTIPLE seeds 🎉. Switch between them effortlessly. Ideal for custodians (think Grandma's stash), devs, experiments, and secure key handling (e.g., TAPSIGNER backups). - **New**: #SeedVault - Encrypted multi-seed storage with easy recall. Supports TRNG, #DiceRolls, etc. - **New**: #PSBTv2 - Enables advanced PSBT workflows and apps. - **New**: #LockDownSeed - Compatible with all ephemeral secrets. - **Name Change**: "Ephemeral Seed" is now "Temporary Seed." - **New**: BIP39 Passphrase - Usable as a words-based ephemeral seed, supports encoded backups, and removes visibility post-activation for added security. - **New**: Toggle between ephemeral and main secrets without a reboot. - **New Shortcut**: Quick Batch Sign PSBT via Ready to Sign -> Press (9). - **Cleanup**: Axed old code to free up space. - **Improved**: Settings slots expanded to 100. - **Fixed**: Off-by-one error in Trick Pins -> Login Countdown resolved. - and more! --- - Upgrade here:

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Version 5.2.0 for Mk4: Seed Vault

New Mk4 Release: Version 5.2.0

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COLDCARD Documentation

Temporary Seed

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