On Fri, Mar 05, 2021 at 05:43:43PM -1000, David A. Harding via bitcoin-dev wrote: > ## Example timeline > - T+0: release of one or more full nodes with activation code > - T+14: signal tracking begins > - T+28: earliest possible lock in > - T+104: locked in by this date or need to try a different activation process > - T+194: activation (if lockin occurred)
> ### Base activation protocol > The idea can be implemented on top of either Bitcoin Core's existing > BIP9 code or its proposed BIP8 patchset.[6] > BIP9 is already part of Bitcoin Core and I think the changes being > proposed would be relatively small, resulting in a small patch that > could be easy to review. To get to specifics, here's a PR, based on #21334, that updates bip9 to support an extra parameter to delay the transition from LOCKED_IN to ACTIVE until a particular timestamp is reached, and to reduce the activation threshold to 90%: https://github.com/bitcoin/bitcoin/pull/21377 With that in mind, I think the example timeline above could translate to taproot parameters of: nStartTime = 1618358400; // April 14, 2021 nTimeout = 1626220800; // July 14 2021 activation_time = 1633046400; // October 1 2021 That is, signalling begins with the first retarget period whose parent's median time is at least April 14th; and concludes with the last retarget period whose final block's median time is prior to July 14th; that's 91 days which should be about ~6.5 retarget periods, so should cover 6 full retarget periods, but could only cover 5. Activation is delayed until the first retarget period where the final block of the previous retarget period has a timestamp of at least October 1st. Note that the timeout there is prior to the expected timestamp of the startheight block specified in the proposal for bip8 parameters: https://en.bitcoin.it/wiki/Taproot_activation_proposal_202102 and earliest activation is after the expected release of 22.0 and hence the maintenance end of 0.20. Note also that the PR above specifies the delay as a deadline, not a delta between lockin and activation; so earlier lockin does not produce an earlier activation with the code referenced above. Cheers, aj _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
