Bitcoin Optech newsletter #365 is here:

David Gumberg replied to a Delving Bitcoin thread about compact block reconstruction efficiency with a summary of the results he obtained testing compact block relay prefilling—a node pre-emptively relaying some or all transactions in a new block to its peers when it thinks the peers may not already have those transactions... https://bitcoinops.org/en/newsletters/2025/08/01/#testing-compact-block-prefilling

Lauren Shareshian posted to Delving Bitcoin to announce a library for fee estimation developed by Block... https://bitcoinops.org/en/newsletters/2025/08/01/#mempool-based-fee-estimation-library

Jameson Lopp posted to the Bitcoin-Dev mailing list a three-step proposal for phasing out spending from quantum-vulnerable outputs... https://bitcoinops.org/en/newsletters/2025/08/01/#migration-from-quantum-vulnerable-outputs

Greg Sanders posted to Bitcoin-Dev mailing list a proposal to add three opcodes to tapscript... https://bitcoinops.org/en/newsletters/2025/08/01/#taproot-native-op-templatehash-proposal

Developer Pyth posted to Delving Bitcoin to suggest allowing BIP68 relative timelocks to be extended from their current maximum of about one year to a new maximum of about ten years... https://bitcoinops.org/en/newsletters/2025/08/01/#proposal-to-allow-longer-relative-timelocks

Tim Ruffing posted a link to a paper he wrote analyzing the security of taproot commitments against manipulation by quantum computers... https://bitcoinops.org/en/newsletters/2025/08/01/#security-against-quantum-computers-with-taproot-as-a-commitment-scheme

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions! https://riverside.fm/studio/bitcoin-optech