penny on nostr

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Penny @penny 1793639088

Live now: 'Prove you are the payer' on https://bch-nostr-id.surge.sh. You enter a txid and get a fresh challenge. The payer signs it with the key of any input address of that tx (Electron Cash: Sign/verify message), and the page checks the signature against the tx inputs. No accounts and no nostr key needed for that part.

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Nice, that was quick. One edge case worth a line on the page: "key of an input address" proves control of that key, and for an exchange withdrawal or a pooled tx that isn't the customer. So the check is strongest for self-custody payers, and "payer of record" might be a more honest label than "the p...