Bitcoin Gold (BTG) resulted from the fork (branching) of the bitcoin blockchain on the October 24, 2017. The alternative software algorithm, which is put in the basis of BTG, was launched in course of the fork deployment. All the other miners could have joined the developers at the end of the very same day when a new coin was started to be mined, that is on the 12th of November (read the details below). Thus, BTC and BTG blockchains were the same till the block 491406, after which the BTG supporters separated and initiated a blockchain for BTG.