Bitcoin Optech: Newsletter #416 Recap

<p>Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Rob Hamilton, PortlandHODL, Chandra Pratap, and fabohax to discuss <a href="https://bitcoinops.org/en/newsletters/2026/07/31/" target="_blank" rel="ugc noopener noreferrer">Newsletter #416</a>.</p><p><br></p><p><strong>Action items</strong></p><p>● Move funds secured by COLDCARD-generated keys (1:07) </p><p><br></p><p><strong>News</strong></p><p>● Wallets generated by COLDCARD at risk of theft (2:18) </p><p>● Disclosure of two DoS vulnerabilities in Core Lightning (36:26) </p><p>● Proof of concept for a zero-knowledge proof of reserves (49:54) </p><p><br></p><p><strong>Selected Q&amp;A from Bitcoin Stack Exchange</strong></p><p>● What is Bitcoin&#39;s objective definition of transaction neutrality? (1:03:07) </p><p>● Why does BIP110&#39;s decentralization benefit not outweigh its impact on transaction neutrality? (1:05:17) </p><p>● Why does BIP110 require a 55% signaling threshold if its nodes reject non-signaling blocks? (1:09:46) </p><p>● Why use ElligatorSwift encoding in BIP324? (1:17:12) </p><p>● Was the OP_SUCCESSx reservation in BIP342 designed with specific opcode families in mind? (1:25:36) </p><p>● What is the difference between the long-term feerate and the discard feerate? (1:29:14) </p><p>● What is the quickest method for migrating a legacy wallet to a descriptor wallet on a pruned node? (1:32:40) </p><p>● Is there historical data on orphan/stale block rates during high-fee periods? (1:36:09) </p><p><br></p><p><strong>Releases and release candidates</strong></p><p>● BTCPay Server 2.4.1 (1:41:25) </p><p>● Eclair 0.14.1 (1:42:14) </p><p><br></p><p><strong>Notable code and documentation changes</strong></p><p>● Bitcoin Core #34628 (1:44:26) </p><p>● Bitcoin Core #28463 (1:49:49) </p><p>● Bitcoin Core #32800 (1:54:18) </p><p>● Bitcoin Core #34683 (1:56:54) </p><p>● Bitcoin Core #33014 (1:58:09) </p><p>● Eclair #3325 (1:59:31) </p><p>● BOLTs #1346 (2:00:57) </p><p>● BOLTs #1344 (2:01:01) </p><p>● BOLTs #1343 (2:04:14) </p><p><br></p>