Bitcoin Optech newsletter #424 is here: - describes a proposal for upgrading the offchain protocols of the Lightning Network to post-quantum security - summarizes popular Q&A from Stack Exchange - Optech Newsletter #424 Podcast https://bitcoinops.org/en/newsletters/2026/09/25/ Ahmet Kurt posted to Delving Bitcoin about a new proposal for upgrading the offchain surfaces of the Lightning Network to be quantum-secure, called PQLN... https://bitcoinops.org/en/newsletters/2026/09/25/#proposal-for-a-post-quantum-lightning-network Selected Q&A from Bitcoin Stack Exchange - What would be a drawback if sum instead of SHA256 of amounts was used in the taproot signature message? - Post-BIP110 fork is it necessary to resync from block 0? - Can a Bitcoin node build a partial UTXO set from only the most recent blocks and use it to validate new transactions? https://bitcoinops.org/en/newsletters/2026/09/25/#selected-qa-from-bitcoin-stack-exchange Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.

Davidson Souza, Eric Price, and PortlandHODL joined Optech to discuss Newsletter #423: - Vardiff controllers that strand slowing miners - Improvements in Utreexo initial block download - New BIP draft for unspendable internal keys - EntropyLab offline key calculator - And more You can listen on our website: https://bitcoinops.org/en/podcast/2026/09/22/ Fountain: https://fountain.fm/episode/5hIED6smJEYRJVJYKKbp Spotify: https://open.spotify.com/episode/0i3aMQNubUMWkTPomZSDfg Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-423-recap/id1674626983?i=1000791172229

Bitcoin Optech newsletter #422 is here: - describes a proposed protocol for probabilistic coinjoins disguised as covert bets - summarizes benchmarks of a silent payments indexing server against compact block filters for light clients - Optech Newsletter #422 Podcast https://bitcoinops.org/en/newsletters/2026/09/11/ Adam Gibson posted to Delving Bitcoin about Babilonia, a proposal for a new probabilistic coinjoin and covert betting protocol... https://bitcoinops.org/en/newsletters/2026/09/11/#a-protocol-for-probabilistic-coinjoin-and-covert-betting Rob Segers posted to the Bitcoin-Dev mailing list providing specifications for silent payments light clients and measuring performance of different ways to retrieve data from blocks... https://bitcoinops.org/en/newsletters/2026/09/11/#update-on-silent-payments-light-clients Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.