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SegWit2x Working Group


The charter of this working group is design, implement, build, test, and deploy the software required to make Bitcoin scale, in accordance with the specific points of the agreement made on May 21, 2017. Participants in the agreement are expected to allocate technical resources to testing and deploying the software within the timeframe below.


  • May 23 - Kickoff
  • May 30 - Pre-Alpha
    • More detailed plan sent out to the Agreement Participants for feedback
  • June 16 - Alpha Milestone
    • Alpha software ready
    • New testnet network setup
    • BIP published
  • June 30 - Beta Milestone
    • All comments / issues from Alpha have been addressed
    • Testing complete
  • July 14 - Agreement Participants Install and Test Milestone
  • July 21 - Nodes Running & Signaling begins
  • August 23 - SegWit active on network
  • August status report in English, and in Chinese

Mailing list

A publicly archived, members-only mailing list is available. Info page, Archives


The initial effort of the working group focuses on producing a segwit2x reference implementation in C++. This is published to the "segwit2x" branch at

Other resources