fun processRequest(txBits: SerializedBytes<WireTransaction>, reqIdentity: Party): Result
Checks that the timestamp command is valid (if present) and commits the input state, or returns a conflict if any of the input states have been previously committed
Note that the transaction is not checked for contract-validity, as that would require fully resolving it
into a TransactionForVerification, for which the caller would have to reveal the whole transaction history chain.
As a result, the Notary
TODO: the notary service should only be able to see timestamp commands and inputs