protected fun verifyProposal(maybeProposal: UntrustworthyData<Proposal<Party>>): Proposal<Party>
Check the notary change proposal.
For example, if the proposed new notary has the same behaviour (e.g. both are non-validating) and is also in a geographically convenient location we can just automatically approve the change. TODO: In more difficult cases this should call for human attention to manually verify and approve the proposal