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([2601:600:9c00:1d0::250e]) by smtp.gmail.com with ESMTPSA id x9sm4757779pjp.3.2021.03.06.02.26.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 06 Mar 2021 02:26:33 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Eric Voskuil Mime-Version: 1.0 (1.0) Date: Sat, 6 Mar 2021 02:26:32 -0800 Message-Id: References: <20210306092931.6jmw6o2u7a2gewwb@erisian.com.au> In-Reply-To: <20210306092931.6jmw6o2u7a2gewwb@erisian.com.au> To: Anthony Towns , Bitcoin Protocol Discussion X-Mailer: iPhone Mail (18D52) Subject: Re: [bitcoin-dev] Taproot activation proposal "Speedy Trial" X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Mar 2021 10:26:35 -0000 The most sensible approach I=E2=80=99ve seen yet. e > On Mar 6, 2021, at 01:29, Anthony Towns via bitcoin-dev wrote: >=20 > =EF=BB=BFOn Fri, Mar 05, 2021 at 05:43:43PM -1000, David A. Harding via bi= tcoin-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 pro= cess >> - T+194: activation (if lockin occurred) >=20 >> ### 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. >=20 > 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%: >=20 > https://github.com/bitcoin/bitcoin/pull/21377 >=20 > With that in mind, I think the example timeline above could translate > to taproot parameters of: >=20 > nStartTime =3D 1618358400; // April 14, 2021 > nTimeout =3D 1626220800; // July 14 2021 > activation_time =3D 1633046400; // October 1 2021 >=20 > 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. >=20 > Note that the timeout there is prior to the expected timestamp of the > startheight block specified in the proposal for bip8 parameters: >=20 > https://en.bitcoin.it/wiki/Taproot_activation_proposal_202102 >=20 > and earliest activation is after the expected release of 22.0 and hence > the maintenance end of 0.20. >=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. >=20 > Cheers, > aj >=20 > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev