Correction: Fork is scheduled for Oct 25th, I spoke the wrong month.
Bitcoin gold is a proposed hard fork on the Bitcoin network that will change the proof of work algorithm to equihash. The main advantage of this is to break the reliance of bitcoin on ASIC mining and switch to GPU based mining. When the fork happens, this will cause a chain split, and all bitcoin wallets that have bitcoin prior to the split have both bitcoin and bitcoin gold (not bitcoin cash)
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