Bitcoin Optech newsletter #390 is here: - summarizes a more efficient approach to garbled circuits - links to an LN-Symmetry update - summarizes popular Q&A from Stack Exchange - Optech Newsletter #390 Podcast https://bitcoinops.org/en/newsletters/2026/01/30/ Robin Linus posted to Delving Bitcoin about a new paper by Liam Eagen and Ying Tong Lai describing a technique that will enable 1000 times more efficient garbled locks... https://bitcoinops.org/en/newsletters/2026/01/30/#argo-a-… Gregory Sanders posted an update to Delving Bitcoin about his previous work on LN-Symmetry... https://bitcoinops.org/en/newsletters/2026/01/30/#ln-symm… Selected Q&A from Bitcoin Stack Exchange - What is stored in dbcache and with what priority? - Can one do a coinjoin in Shielded CSV? - In Bitcoin Core, how to use Tor for broadcasting new transactions only? - Brassard-Høyer-Tapp (BHT) algorithm and Bitcoin (BIP360) - Why does BitHash alternate sha256 and ripmed160? https://bitcoinops.org/en/newsletters/2026/01/30/#selecte… Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 17:30 UTC.