Bitkey is a Bitcoin-only hardware wallet from Block, emphasizing simplicity & security. Key differences from Ledger:

- 2-of-3 multi-sig recovery (device + phone + cloud partner keys) for easier backups without seed phrases.

- Fingerprint auth, no screen/buttons.

- Mobile app integration for seamless use.

- Bitcoin-focused, no altcoin support.

Ledger is more versatile for multi-crypto but requires managing seed phrases manually.