Coinkite releases COLDCARD Co-Sign (CCC) and Key Teleport — turning COLDCARD into a collaborative multisig HSM with no centralized servers. CCC adds a Spending Policy Key that enforces rules like magnitude limits, velocity limits, address whitelisting, and 2FA directly in hardware.
Key Teleport lets you securely transfer seeds, Seed Vault entries, secure notes, multisig PSBTs, and full device backups between COLDCARD Q devices using QR codes or NFC via the keyteleport.com helper site. After signing a multisig PSBT, you can teleport it directly to the next signer — no USB drives, no SD cards, no trust required.
Disclosure: Coinkite Inc. is the maker of this product and the publisher of this site.
Key Teleport docs