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In the full history of the XRP Ledger, there is an exception to the rule that transaction hashes are unique. Two early [SetFee pseudo-transactions][] had the exact same fields, resulting in the same hash, 1C15FEA3E1D50F96B6598607FC773FF1F6E0125F30160144BE0C5CBC52F5151B. The first of these transactions appears in ledger 3715073 and the second is in ledger 3721729. Newer SetFee pseudo-transactions include a LedgerSequence field so that they are guaranteed to be unique.