On this thread, the user asked what is the longest unintentional fork that Bitcoin had suffered. From the answers present, Bitcoin never had a >4 block fork until 2012.

It has been 6 years though, and I wonder if there is a more up-to-date statistics on that question, and if any study has been done so far.

1 Answer 1


11/12 March 2013 Chain Fork at block height 225,430.It's 31 blocks long.

  • Wow, was that a brute PoW fork? Or was that a bug / protocol patch or similar?
    – MaiaVictor
    Sep 19, 2018 at 14:49
  • 1
    It was an issue with version of bitcoin client.Miner mined with the version 0.8.0 which wasn't compatible with version 0.7 Sep 19, 2018 at 14:53

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