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There has been at least one fork that reversed bitcoin transactions. They are in no way final in practice even if the "spec" claims that they are.

• int_19h 5y ago
  The resulting fork isn't Bitcoin, though, so no Bitcoin transactions are reversed in this manner.
  • zaphar 5y ago
    Actually the non-bitcoin fork is the one that didn't reverse the transactions. Bitcoin proper is the one that did reverse them if memory serves. I'll grant that sometimes memory does not serve though and I'm just too lazy to grab the citation right now.
    • smitop 5y ago
      I think you're thinking about this incident? https://en.bitcoin.it/wiki/Value_overflow_incident https://en.bitcoin.it/wiki/Value_overflow_incident In that case, ~9 hours of transaction history were reversed because of a transaction that resulted in an overflow in the main (and I think only at the time) Bitcoin client allowing the creation of unlimited Bitcoin.