[bitcoin-dev] Draft BIP: Segwit deployment with versionbits and guaranteed lock-in

[Luke Dashjr]

See Segwit v2 thread. Maybe we can collaborate on combining these.

On Wednesday 26 April 2017 6:15:26 PM shaolinfry via bitcoin-dev wrote:
> This is a draft BIP proposal to redeploy segwit using BIP-8, from the day
> after the current BIP9 segwit times out.
> 
> This BIP could be deployed long before Nov 15th 2016, for example in July
> allowing wide deployment to begin soon. The timeout (and this
> useractivation) could be set to roughly a year from then. However,
> considering around 70% of nodes upgraded to witness capability within 5-6
> months, I personally think we could reduce the time, especially
> considering how much people want segwit - but I understand the need for
> more caution in Bitcoin.
> 
> Preliminary dates are deploy within a couple months, startdate Nov 16th
> 2017, BIP8 timeout July 4th 2018.
> 
> <pre>
> BIP: ?
> Layer: Consensus (soft fork)
> Title: Segwit deployment with versionbits and guaranteed lock-in
> Author: Shaolin Fry <shaolinfry at protonmail.ch>
> Comments-Summary: No comments yet.
> Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-????
> Status: Draft
> Type: Standards Track
> Created: 2017-04-14
> License: BSD-3-Clause
> CC0-1.0
> </pre>
> 
> ==Abstract==
> 
> This document specifies a user activated soft fork for BIP141, BIP143 and
> BIP147 using versionbits with guaranteed lock-in.
> 
> ==Motivation==
> 
> Miners have been reluctant to signal the BIP9 segwit deployment despite a
> large portion of the Bitcoin ecosystem who want the soft fork activated.
> This BIP specifies a user activated soft fork (UASF) that deploys segwit
> again using versionbits with guaranteed lock-in on timeout if the BIP is
> not already locked-in or activated by the timeout. This ensures users have
> sufficient time to prepare and no longer require a miner supermajority,
> while still allowing for an earlier miner activated soft fork (MASF).
> 
> ==Reference implementation==
> 
> https://github.com/bitcoin/bitcoin/compare/master...shaolinfry:uasegwit-fla
> gday
> 
> ==Specification==
> 
> This deployment will set service bit (1<<5) as NODE_UAWITNESS.
> 
> ==Deployment==
> 
> This BIP will be deployed by BIP8 with the name "uasegwit" and using bit 2.
> 
> For Bitcoin mainnet, the BIP8 starttime will be midnight 16 November 2017
> UTC (Epoch timestamp 1510790400) and BIP8 timeout will be 4 July 2018 UTC
> (Epoch timestamp 1530662400).
> 
> For Bitcoin testnet, segwit is already activated so no deployment is
> specified.
> 
> ==Rationale==
> 
> This BIP can be deployed well in advance of the BIP8 '''starttime''' so
> that the '''timeout''' will be sufficiently far in the future to allow
> Bitcoin users to uprgade in preparation.
> 
> The '''starttime''' of this BIP is after the BIP9 "segwit" timeout to
> remove compatibility issues with old nodes.
> 
> ==References==
> 
> https://github.com/bitcoin/bips/blob/master/bip-0008.mediawiki
> 
> https://github.com/bitcoin/bips/blob/master/bip-0009.mediawiki
> 
> https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki
> 
> https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki
> 
> https://github.com/bitcoin/bips/blob/master/bip-0147.mediawiki
> 
> ==Copyright==
> 
> This document is dual licensed as BSD 3-clause, and Creative Commons CC0
> 1.0 Universal.