<ul><li>Bitcoin Puzzle #66 involves attempting to discover a mostly-zero private key to claim the bitcoin prize.</li><li>There are competing theories regarding the outcome of the puzzle, including a bot outsmarting a participant and the puzzlemaster cheating.</li><li>There is currently no public or reliable private record available to corroborate any specific theory.</li><li>An unconfirmed transaction on mempool.space was briefly available, but the page has since been removed and not archived.</li></ul>

Bitcoin Puzzle 66: Is this unconfirmed transaction archived anywhere?

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