New Features
“MicroSD card as Second Factor”. Specially marked MicroSD card must be already inserted when (true) PIN is entered, or else seed is wiped. Add, remove and check cards in menu: Settings -> Login Settings -> MicroSD 2FA
Import TAPSIGNER encrypted backup as main or ephemeral seed, for PSBT signing. This is a great way to safely use the key previously held inside a TAPSIGNER, because the COLDCARD can take over the signing that used to be done by the card.
Detached Bitcoin signature files for most exports.
Files exported are now signed with a detached signature. Look for a .sig file with the same name, and verify signature with your favourite Bitcoin tools. See “Signed Exports” in docs/msg-signing.mdfor more information.
Coldcard can now verify signed files:
SD card and Virtual disk Advanced/Tools -> File Management -> Verify Sig File
NFC Advanced/Tools -> NFC Tools -> Verify Sig File
Related new website: Check your Bitcoin signatures here
Enhancements
Address Explorer:
Application-specific derivation paths in Address Explorer -> Applications
Bugfix: Change value was ignored when generating addresses file
Imports:
Add import multisig wallet via Virtual Disk
Add import extended private key via Virtual Disk and via NFC
Import seed in compact/truncated form (just 3-4 letters of each seed word)
Import extended private key as ephemeral seed
Export:
Samourai POST-MIX and PRE-MIX descriptor export options added
Lily Wallet added
Ability to export all supported wallets via NFC (instead of SD card only)
Change electrum export file name from ‘new-wallet.json’ to ‘new-electrum.json’
Allow export of Wasabi skeleton for Bitcoin Regtest.
Backup Enhancement:
Option to save the backup file’s encryption password for next backup. Then next backup is quick and simple: no need to record yet another 12 words.
During seed generation from dice rolls, enforce at least 50 rolls for 12 word seeds, and 99 rolls for 24 word seeds. Statistical distribution check
Single signature wallet generic descriptor export Advanced -> Export Wallet -> Descriptor. Both new format with internal/external in one descriptor <0;1> and standard with two descriptors are supported. added to prevent users from generating low-entropy seeds by rolling same value repeatedly.
Docs: Add docs/rolls12.py script for verifying dice rolls math for 12 word seeds.
Bug Fixes
Offer import/export from/to Virtual Disk in UI even if SD Card is inserted.
Recalculate extended key saved in settings upon chain change (BTC, XTN, XRT).
Provide correct derivation path (m/84’/1’/0’) for testnet Wasabi export.
Properly display UX checkmark only if testnet (XTN, XRT) is enabled in Settings- > Danger Zone -> Testnet Mode.Get the Mk4