[aaron-santos]

What does it mean to reject the issuer when there are around 4.4 million notaries in the US? What systems are in place now or would need to be created in order to aggregate trust and what are the pros and cons associated with those systems?

[supertrope]

For individual notaries file a complaint about incompetence or report them for fraud. Signatures, seals, and watermarks aren't as good as public crypto but that's okay because phone calls, clearinghouses, and the legal system backstops them (especially for reversible transactions).

Rejecting issuers would be more applicable to repeated transactions from a corporate certificate authority.