UASF

• User Activated Soft Fork. Developers add a mandatory rule set to change the node’ software, invalidating certain kinds of previously valid blocks after a flag day. This method requires no mining majority to support or activate a chain-split.
• Got more well known because a part of the Bitcoin community wants to implement Segwit by a UASF. This UASF is also known as BIP 148.
• Got [[ https://www.coindesk.com/bitcoin-uasf-proposal-quietly-activates-little-effect/%7Cactivated]] July 2017