Bitcoin Optech: Newsletter #378 Recap

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #378 (https://bitcoinops.org/en/newsletters/2025/10/31/).

News ● CPU DoS from unconfirmed transaction processing (1:00)

Selected Q&A from Bitcoin Stack Exchange ● Why was -datacarriersize redefined in 2022, and why was the 2023 proposal to expand it not merged? (17:53) ● What is the smallest valid transaction that can be included in a block? (22:59) ● Why does Bitcoin Core continue to give witness data a discount even when it is used for inscriptions? (25:38) ● The ever-growing Bitcoin blockchain size? (39:17) ● I read that OP_TEMPLATEHASH is a variant of OP_CTV. How do they differ? (44:59)

Releases and release candidates ● LND 0.20.0-beta.rc1 (49:59) ● Eclair 0.13.1 (50:43)

Notable code and documentation changes ● Bitcoin Core #29640 (51:21) ● Core Lightning #8400 (54:15) ● Eclair #3173 (54:53) ● LND #10280 (56:56) ● BIPs #2006 (57:27) ● BIPs #1975 (1:00:58)