BIP-110: Clarify rule 2, update Deployment, and specify GBT usage #2115

1. 
   dathonohm commented at 3:29 am on March 5, 2026: contributor

   Updates to match the reference implementation and address community feedback:

   • Rule 2: Several people were confused about which witness stack elements are limited by rule 2, so I have added a definition for “script argument witness items” (@murchandamus’ preferred nomenclature) with a FAQ entry explaining exactly which elements are excluded and why. See this thread on the original PR for more context.
   • Deployment: The reference implementation now has an EXPIRED terminal state in the state machine. Updated the deployment section to reflect this.
   • GBT: Added a GetBlockTemplate subsection to the specification, following BIP 9 conventions, since the reference implementation now includes full GBT support.
2. BIP-110: Clarify rule 2 witness stack element exclusions ddd5db9a63
3. BIP-110: Update deployment section with EXPIRED state; add GBT subsection to specification 44b72212f2
4. luke-jr approved
5. 
   luke-jr commented at 3:37 am on March 5, 2026: member

   lgtm
6. luke-jr merged this on Mar 5, 2026
7. luke-jr closed this on Mar 5, 2026

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8. 
   murchandamus commented at 3:45 pm on March 5, 2026: member

   Good improvements. If this had been left open long enough for others to comment, I would have suggested that you introduce a Changelog section and Version header, and consider advancing your proposal to Complete.
9. murchandamus added the label BIP update by author on Mar 5, 2026

Contributors
dathonohm luke-jr murchandamus

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BIP update by author