Presentation is typically signed with a proof, e.g. of possession of the private key. It also includes elements in the request for a presentation - a non-repea

Presentation is typically signed with a proof, e.g. of possession of the private key. It also includes elements in the request for a presentation - a non-repeating nonce and the domain to make it an interactive challenge. The ability to prevent MITM depends on how well the wallet/protocol does web domain binding.