Segregated Witness SegWit, the Bitcoin protocol upgrade proposed by the Bitcoin Core development team, was originally designed to activate via the Bitcoin Improvement Protocol 9 BIP 9 standard, a hash-power signalling mechanism. This would allow the Bitcoin ecosystem to coordinate the upgrade relatively safely through miner readiness.But with the SegWit proposal in particular, BIP 9 no longer serves just to signal readiness. Miners as well as users increasingly see BIP 9 as a sort of miner vo

Source and More information: These Two UASFs Could Activate SegWit