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