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BIP16 says on 01 Feb 2012, if more than 550 out of the previous 1000 blocks include "/P2SH/" in the coinbase, then BIP16 will activate on 15 Feb 2012 (Source).

BIP16 was later revised. On 15 Mar 2012, if more than 550 out of the previous 1000 blocks include "/P2SH/" in the coinbase, then BIP16 will activate on 01 Apr 2012 (Source).

After searching the coinbase of every block, it looks like the 550 block threshold was reached at Block Height 171,455 on 16/03/2012 22:07:16. Since this is after the evaluation date of 15 Mar 2012, how/why was this considered to pass the threshold by the deadline, when it actually did not?

Any help appreciated. It is driving me nuts :-)

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