Bitcoin Optech: Newsletter #411 Recap

<p>Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Nishant Bansal and Matthew Zipkin to discuss <a href="https://bitcoinops.org/en/newsletters/2026/06/26/" target="_blank" rel="ugc noopener noreferrer">Newsletter #411</a>.</p><p><br></p><p><strong>News</strong></p><p>● LND zero-timestamp gossip DoS disclosure (1:00) </p><p><br></p><p><strong>Selected Q&amp;A from Bitcoin Stack Exchange</strong></p><p>● Is it a bug that `OP_IF` is part of the tapscript opcodes? (34:02) </p><p>● Why would forbidding `OP_IF` in tapscript be a problem? (41:11) </p><p>● Does a softfork always succeed? (49:17) </p><p>● How to set up Bitcoin Core to mine a valid block after the BIP110 activation in August 2026? (56:44) </p><p>● Are BIP110 blocks on a branch with lower difficulty valid? (59:47) </p><p>● What is the story behind Bitcoin test networks? (1:07:41) </p><p>● Why was `-datacarriersize` redefined in 2022, and why was the 2023 proposal to expand it not merged? (1:15:35) </p><p>● Are chains of 26 unconfirmed transactions prohibited by the wallet in Bitcoin Core 31.0? (1:25:33) </p><p>● Are there changes in Bitcoin Core 29.0 that affect memory usage? (1:28:20) </p><p>● What is Bitcoin Core&#39;s release schedule? (1:30:21) </p><p><br></p><p><strong>Releases and release candidates</strong></p><p>● LDK v0.1.10 (1:34:50) </p><p>● LDK v0.2.3 (1:35:31) </p><p>● BTCPay Server 2.4.0 (1:37:04) </p><p><br></p><p><strong>Notable code and documentation changes</strong></p><p>● Bitcoin Core #35070 (1:39:27) </p><p>● Bitcoin Core #35182 (13:15) </p><p>● BIPs #2198 (1:46:09) </p><p>● LDK #4713 (1:51:17) </p><p>● LDK #4684 (1:53:47) </p><p><br></p>