Bitcoin's miners weren't expected to start signaling for the controversial scaling proposal Segwit2x until July 21,
but some are already moving to show support in advance of another round of software testing.
As of today, about 43% of bitcoin's mining power is signaling for the change,
including AntPool, BitClub, Bixin, BTC.com and BitFury – and other mining pools may be on the way. Slush Pool, which oversees about 5% of the hashrate, said that it will soon signal as well. As of now, there is no way to tell which are running the code.
