● OP_CHECKTEMPLATEVERIFY (CTV) Workshop: video (morning, afternoon) and a transcript are available from a recent workshop about BIP119 CTV. If this proposed soft fork is adopted, users would be able to use a new CTV opcode to create covenants with less interaction than would be required using current consensus rules. Several possible applications of the opcode were discussed, with most attention being focused on vaults and compressed payment batching (sometimes called congestion control transactions, see Newsletter #48). A significant part of the workshop also consisted of critical feedback from the audience and replies to the criticism. A final discussion covered how and when to attempt to get BIP119 activated, including when a PR for it should be opened to the Bitcoin Core repository, what activation mechanism it should use (e.g. BIP9 versionbits), and what range of activation dates would be appropriate if it uses a miner-activated soft fork mechanism such as BIP9.

Subsequent to the workshop, CTV proposer Jeremy Rubin announced a mailing list to help coordinate future review and discussion of the BIP119 proposal.