When a valid alert was received, BTC clients could enter a form of safe mode, warning users and, in certain cases, limiting normal operation to prevent further damage. Before stepping away, Satoshi transferred this powerful key to Gavin Andresen and also handed over the control of the code repository. Access to the key was reportedly limited to three people: Satoshi Nakamoto, Gavin Andresen, and Theymos.
How Bitcoin Naturally Gravitates Toward Untapped Liquidity Zones 
