Bitcoin Optech: Newsletter #421 Recap

<p>Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by average_gary, Erick Cestari, Conduition, and Greg Sanders to discuss <a href="https://bitcoinops.org/en/newsletters/2026/09/04/">Newsletter #421</a>.</p><p><br></p><p><strong>News</strong></p><p>● Using silent payments for miner payouts in coinbase transaction (2:19) </p><p>● Responsible disclosure of a denial-of-service vulnerability in CLN (27:42) </p><p><br></p><p><strong>Changing consensus</strong></p><p>● Continued discussion of PQC output types (54:03) </p><p>● DropKick commit/reveal PQC rescue (1:14:08) </p><p>● SHRINCS draft BIP (1:35:48) </p><p>● BIP448 and CSFS/CTV demos and applications (37:55) </p><p><br></p><p><strong>Releases and release candidates</strong></p><p>● Core Lightning 26.06.7 (1:51:35) </p><p>● LND v0.21.3-beta (1:55:32) </p><p>● LND v0.20.4-beta (1:55:37) </p><p><br></p><p><strong>Notable code and documentation changes</strong></p><p>● Bitcoin Core #36111 (1:58:21) </p><p>● Bitcoin Core #36032 (2:01:17) </p><p>● Core Lightning #9435 (2:04:52) </p><p>● Eclair #3368 (2:08:10) </p><p>● Eclair #3366 (2:10:54) </p><p>● LND #11090 (2:14:55) </p><p>● LND #11140 (2:20:33) </p><p>● HWI #792 (2:23:55) </p><p>● BDK #2262 (2:25:48) </p>