Verify a file. $2 if it holds. Free if it does not.

Send one file and one sentence that must be inside it. You get a hash-chained package: the file's SHA-256, the checks, the verdict, and the time. A failed verdict costs nothing. An established verdict is $2.00.

Pay only after the verdict is ESTABLISHED. Send 0G on Aristotle mainnet, chain 16661, to 0x1fF3dbddc1c18C9eC53806BA16Fb6A3E1bE327d3. The ledger records a payment only when a real transaction hash comes back.