Bitcoin Optech newsletter #376 is here: - shares an update on the proposal for nodes to share their current block template - summarizes a paper outlining a covenant-less vault construction - Bitcoin Core 30.0 release - Optech Newsletter #376 Podcast https://bitcoinops.org/en/newsletters/2025/10/17/ Discussion continued around the proposal for full node peers to occasionally send each other their current template for the next block using compact block relay encoding... https://bitcoinops.org/en/newsletters/2025/10/17/#continued-discussion-of-block-template-sharing Francesco Madonna posted to Delving Bitcoin about a concept which is a covenant-less vault model using taproot, OP_CHECKSEQUENCEVERIFY, and OP_CHECKLOCKTIMEVERIFY... https://bitcoinops.org/en/newsletters/2025/10/17/#b-ssl-a-secure-bitcoin-signing-layer Bitcoin Core 30.0 is the latest version release of the network’s predominant full node. Its release notes describe several significant improvements... https://bitcoinops.org/en/newsletters/2025/10/17/#bitcoin-core-30-0 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

Bitcoin Optech newsletter #375 is here: - describes research into tradeoffs between usability and security in threshold signatures - summarizes an approach to convert nested threshold signatures into a single-layer signing group - examines the extent to which data could be embedded in the UTXO set under a restrictive set of rules - recaps the "Compact block harness" PR Review Meeting - Optech Newsletter #375 Podcast https://bitcoinops.org/en/newsletters/2025/10/10/ Sindura Saraswathi posted research, co-authored by her and Korok Ray, to Delving Bitcoin about determining the optimal threshold for a multisignature scheme... https://bitcoinops.org/en/newsletters/2025/10/10/#optimal-threshold-signatures ZmnSCPxj posted to Delving Bitcoin to describe how to avoid using nested schnorr signatures in some cases that have not been proven safe... https://bitcoinops.org/en/newsletters/2025/10/10/#flattening-certain-nested-threshold-signatures Adam “Waxwing” Gibson started a discussion on the mailing list about the extent to which data could be embedded in the UTXO set under a restrictive set of rules for Bitcoin transactions... https://bitcoinops.org/en/newsletters/2025/10/10/#theoretical-limitations-on-embedding-data-in-the-utxo-set 'Compact block harness' is a PR by Crypt-iQ that increases the fuzz test coverage by adding a test harness for the compact block relay logic... https://bitcoinops.org/en/newsletters/2025/10/10/#bitcoin-core-pr-review-club 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

Matt Morehouse, Daniela Brozzoni, and Gustavo Flores Echaiz joined Optech to discuss Newsletter #373: - Eclair vulnerability - Research into feerate settings - 12 Bitcoin Stack Exchange questions with an OP_RETURN focus - Bitcoin Core 30.1 release candidate and testing guide - And more You can listen on our website:
https://bitcoinops.org/en/podcast/2025/09/30/ Fountain:
https://fountain.fm/episode/HUKeJE4y8iPGSD9WL4VS Spotify:
https://open.spotify.com/episode/55tV1tepMDPFtcONy8kHQI Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-373-recap/id1674626983?i=1000729551630

Sindura Saraswathi, ZmnSCPxj and Eugene Siegel joined Optech to discuss Newsletter #375: - Optimal Threshold Signatures - Flattening certain nested threshold signatures - Theoretical limitations on embedding data in the UTXO set - The ‘Compact block harness’ Bitcoin Core PR Review Club - And more You can listen on our website: https://bitcoinops.org/en/podcast/2025/10/14/ Fountain: https://fountain.fm/episode/chMU3zQSD9f2tyCuzW4P Spotify: https://open.spotify.com/episode/2PykH77AZa2zugekSKsTPb

Mark “Murch” Erhardt and Mike Schmidt are joined by Gustavo Flores Echaiz to discuss Newsletter #374: - The script restoration BIPs - A BDK Wallet release and release candidates from Bitcoin Core and LND - Our weekly notable code segment You can listen on our website: https://bitcoinops.org/en/podcast/2025/10/07/ Fountain: https://fountain.fm/episode/bN5DD679k2z2NLqaNvHQ Spotify: https://open.spotify.com/episode/2Fpd2NSKSAFydTy02y9cUv Apple Podcasts: https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-374-recap/id1674626983?i=1000730656614