Mark “Murch” Erhardt and Dave Harding are joined by Fabian Jahr, Anthony Towns, and Matt Corallo to discuss Newsletter #306. News Upcoming disclosure of vulnerabilities affecting old versions of Bitcoin Core (1:02) BIP and experimental implementation of testnet4 (10:17) Functional encryption covenants (24:58) Updates to proposed soft fork for 64-bit arithmetic (31:27) `OP_CAT` script to validate proof of work (33:32) Proposed update to BIP21 (42:12) Releases and release candidates Core Lightning 24.05rc2 (54:53) Bitcoin Core 27.1rc1 (55:51) Notable code and documentation changes Core Lightning #7252 (56:50) LDK #2931 (1:02:19) Rust Bitcoin #2644 (1:04:11) BIPs #1541 (1:05:19) BIPs #1556 (1:07:34) BLIPs #32 (1:09:28)