safetyNumber

The safety number of this device and remote, from the local identity key and the key pinned for remote (docs/identity-verification.md). Both devices derive the same value. Show SafetyNumber.displayString or SafetyNumber.encode (for example as a QR code) and let the user compare it with the other device. Throws SecureMessageClientException.RemoteIdentityNotKnown if nothing is pinned; never fetches a bundle. Changes nothing.

The safety number change's presented key would have, so the user can compare it with the other device before accepting the change. Changes nothing and trusts nothing.