'Identity evidence' (sometimes called 'Evidence of decentralized identity') is a signature of Ursula's stamp with the checksum address.

Perhaps I'm too slow today, but I can't figure out what's the best way for Bob to discover this information in a way that gives him assurance that it's valid and compatible with the information contained in MinersEscrow contract.

Bob needs this information in order to request a CFrag evaluation and Ursula's slashing.