You could cache a list of existing notes directly from an Ethereum node for offline verification; this cached information would work for verification until the

You could cache a list of existing notes directly from an Ethereum node for offline verification; this cached information would work for verification until the claim date in the smart contract. Correct, there is no secret service that will remove counterfeit Kong which is why you should verify it yourself or only accept it from parties you trust and have attested to previously verifying it. Habits around verification would likely be governed by the prevalence of counterfeits in a local money supply. If I hear about a bunch of 1 Kong notes failing to verify as counterfeit, then I'll likely verify every 1 Kong note before acceptance.