Bitcoin multisignature, without new hardware

Own your bitcoin.

SovereignKey is a 2-of-3 bitcoin multisignature wallet for iPhone. You hold two keys. We hold one, offline, in a bank vault. Any two can move your bitcoin. We can never move it alone.

Private beta. The SovereignKey beta opens December 1, 2026, by invitation. Questions: matt@sovereign-key.com

How it works

Local Key on your iPhone, protected by the Secure Enclave and Face ID.
Cloud Key encrypted on your iPhone, stored in your own iCloud, opened with a PIN.
Backup Key held by SovereignKey on an offline device in a bank safe-deposit box. It signs only when you ask.

Each of your keys has a 12-word written backup. With your backups and your wallet file, open-source software restores your bitcoin without us.