On August 1, 2017, at Bitcoin Blockheight #478559, developers, exchanges, miners, and node operators running the Bitcoin Cash software began accepting larger blocks. Stakeholders who continued running the Bitcoin Core software kept the blocksize restricted, later forking to a code change called SegWit on August 24, 2017. Bitcoin Cash (BCH) and Bitcoin Core (BTC) are the two largest bitcoin forks by market cap.
The annualized one-month volatility of price changes
Price volatility is computed as the standard deviation of log-returns for the past 31 days, scaled by the square root of 365 to annualize, and expressed as a percentage.