optitor co-signer

optitor is self-hosted MPC custody for digital assets: the key that controls your funds is split across independent signers and is never assembled in one place. The optitor co-signer app turns your phone into a hardware-backed approver for that system.

APPROVE WHAT YOU CAN SEE
• Withdrawals that your policy routes to you arrive with every field in view: amount, asset, chain, destination, source vault, policy version and expiry.
• Your phone recomputes exactly what it signs from those fields. It never signs a value it cannot verify.
• Press and hold to approve, confirm with your fingerprint or face — or reject.

REVIEW POLICY CHANGES
• Every change to your organisation's transaction policy is shown rule by rule, from the very document you sign.
• A new policy publishes only after enough approvers have signed it.

PAIR IN SECONDS
• Scan the one-time code from your optitor console. No passwords, nothing to type.
• Your administrator activates the device in the console before it can approve anything.

BUILT FOR SECURITY TEAMS
• Your approval key is created in the phone's hardware-backed keystore (StrongBox where available) and can only be used after a strong biometric. It never leaves the device.
• No ads, no analytics, no tracking. Your approvals go only to your organisation's own optitor server.

WHO IT IS FOR
The app works with an optitor deployment run by your organisation; your administrator invites you from the optitor console. Not using optitor yet? Tap "Explore a demo" on the first screen to try the approval screens with sample data, or visit optitor.com.