what it is
Bitcoin-only signing device. Air-gapped - it signs by SD card or QR and never has to touch your computer. Open firmware you can verify yourself, and nothing on it ever phones home.
in the field
This is the vault. Paired with Sparrow over PSBT, cold storage becomes boring - exactly what storing wealth should be. Duress PINs, verifiable firmware, paranoia pointed in the right direction.
the fine print
The menus take a weekend to love. Buy direct from Coinkite, never a reseller - the supply chain is part of the security. Seed goes on steel, not paper.
verdict
The reference. Real weight ends in a Coldcard.