Bitcoin Optech: Newsletter #419 Recap

<p>Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Bastien Teinturier, Salvatore Ingala, and spacebear to discuss <a href="https://bitcoinops.org/en/newsletters/2026/08/21/">Newsletter #419</a>.</p><p><br></p><p><strong>News</strong></p><p>● Reorg vulnerability in LND channel closes (1:13) </p><p>● Draft BIP for `rawtr()` output script descriptor (1:14:36) </p><p><br></p><p><strong>Changes to services and client software</strong></p><p>● Payjoin Dev Kit (rust-payjoin) 1.0.0 released (55:33) </p><p>● Silent Payments sender plugin for Electrum (1:21:41) </p><p>● Superscalar implementation announced (1:22:34) </p><p>● Cofund multisig wallet announced (1:24:57) </p><p>● Lexe adds human-readable addresses and LNURL-withdraw (1:25:55) </p><p>● Ledger Bitcoin app 2.5.0 adds human-readable policy descriptions (37:17) </p><p>● Bark 0.5.0 released (1:27:34) </p><p>● Bitcoin-PIR for private UTXO queries (1:28:16) </p><p>● OP_TEMPLATEHASH Ark demonstration (1:29:44) </p><p>● libshrincs formally verified hash-based signatures (1:34:00) </p><p><br></p><p><strong>Notable code and documentation changes</strong></p><p>● Bitcoin Core #32784 (1:38:08) </p><p>● Bitcoin Core #35797 (1:40:45) </p><p>● Bitcoin Core #35531 (1:44:14) </p><p>● Bitcoin Core #35889 (1:48:44) </p><p>● Bitcoin Core #35605 (1:51:06) </p><p>● Eclair #3352 (12:15) </p><p>● Eclair #3351 (20:31) </p><p>● Eclair #3345 (23:16) </p><p>● LND #8754 (1:54:23) </p><p>● LND #11065 (1:55:47) </p><p>● HWI #842 (1:57:04) </p>