Version 4.1.2 Released (More QR Codes)
Shows QR code with BIP-85 derived entropy value if you press (3) while value shown on-screen. Thanks to @opennoms for idea. Works with 12/18/24-words, XPRV, privatekey and even hex cases.
Offer to show QR in other places:
Coldcard’s main XPUB, in Advanced > View Identity
Seed words, during picking process (before the quiz)
Stored seed words: Advanced > Danger Zone > Seed Functions > View Seed Words
TXID of just-signed transaction (64 hex digits)
Encryption password for the system backup file (12 words)
We now grind a nonce so that our signatures are always 71 bytes or shorter. This may save a byte in transaction size, and makes our signatures identical to those produced by Bitcoin Core, improving anonymity on-chain. Thanks to @craigraw for detecting this.
On a blank Coldcard, after importing a seed phrase using the Seed XOR feature, the main menu was not updated to show system is “Ready To Sign”.
Red caution light could happen (a false positive) if a specific sequence of firmware upgrades and reboots occured in the right order. Issue could only occur once during lifetime of any particular Coldcard.
We have a growing library of video tutorials on Youtube … and we’re still adding more!