Embodiments described herein relate to a server computer operable to provide a proof of knowledge service. In some embodiments, the server computer includes processor(s) and memory containing instructions executable by the processor(s) such that the server computer is operable to authenticate a user on behalf of a relying party server. The server computer is further operable to obtain results of one or more tests from a client device of the user. The server computer is further operable to send one or more instructions to the relying party server in accordance with the results of the one or more tests, where the one or more instructions have been predefined by the user and define one or more actions to be taken by the relying party server in an event where the user does not pass the one or more tests.