In a few months, beginning 1 August 2017, there may be some turbulence ahead for the Bitcoin network.
Bitcoin Improvement Proposal (BIP) 148 is a User Activated Soft Fork (UASF) that requires that miners signal for Segregated Witness (SegWit). SegWit readiness is signalled by miners by setting the version number of blocks mined.
http://www.uasf.co/
https://www.weusecoins.com/uasf-guide/
https://www.youtube.com/watch?v=57UZbE_4WJI