Signature.Of_V2val public_key_hash :
Signature.V2.Public_key_hash.t ->
Signature.V_latest.Public_key_hash.tval public_key : Signature.V2.Public_key.t -> Signature.V_latest.Public_key.tval secret_key : Signature.V2.Secret_key.t -> Signature.V_latest.Secret_key.tval signature : Signature.V2.t -> Signature.V_latest.t