Midas Signer

Midas Signer is the signing app for the people who hold a seat on the Midas Chain multisig Safes. It turns a phone into a hardware signer: the signing key is created inside the phone's secure hardware, it cannot be exported, and every signature needs your face or fingerprint.

The app holds no funds. It is not a wallet and there is no seed phrase. Real use requires enrolment: a phone only becomes a signer after the existing signers of a Safe add it on chain, so the app signs nothing for anyone who has not been enrolled. Anyone can try every screen with Explore the demo.

WHAT IT DOES
- Hardware key: the Secure Enclave on iPhone, StrongBox or the trusted execution environment on Android. A new face or fingerprint added to the phone disables the key, so a thief who learns your passcode cannot sign.
- YubiKey backup: register one or two YubiKeys as the second key of your seat. Lose your phone, tap a YubiKey on a new one, and you are signing again without anyone else having to approve.
- Clear signing: every request is decoded on the phone from the raw transaction, checked against the chain, and shown as a plain sentence with its risk level. A call the app does not recognise stays blocked unless you type a confirmation that you wrote it.
- Six check words: read them aloud to another signer, whose phone computes its own, to confirm you are both approving the same transaction.
- Hold to approve: a deliberate press and a biometric prompt for every signature.
- Monthly check-in: one tap proves your seat is still alive, with no gas and nothing written on chain.
- Duress PIN (optional): a second PIN that opens a normal-looking app, never signs, and quietly alerts the other signers.
- Notifications without content: a push only tells the app to fetch new requests after you unlock it.

THE DEMO
Tap Explore the demo on the first screen to try the app with sample Safes and sample requests: decoded approvals, hold to approve, the monthly check-in and the settings. The demo runs only on your phone and is kept apart from a real seat. Nothing in it is real, nothing is sent anywhere, and no account is needed. Leave it at any time from the band at the top or from Settings.

PRIVACY
No analytics, no advertising, no tracking. The app talks only to the Midas Signer service and to the public chain endpoints it uses to check requests.

Languages: English, Spanish, Japanese, Portuguese and Chinese.