and that was immediately applied to all blocks.
Bitcoin Core started validating it from the genesis block in commit cb420a1dfc23d3c11c5281ed8f7ae003c2f61594 (February 2010). Before that it was only applied from block 36,001, starting with commit b075bbf9862df41cdf5265026ba787b7d0fecb07. Before that it was only applied from block 31,001.
