Bitcoin Optech: Newsletter #390 Recap
Wed Feb 04 2026
Mark “Murch” Erhardt and Gustavo Flores Echaiz are joined by Liam Eagen to discuss Newsletter #390.
News
● Argo: a garbled-circuits scheme with more efficient off-chain computation (0:48)
● LN-Symmetry update (26:05)
Selected Q&A from Bitcoin Stack Exchange
● What is stored in dbcache and with what priority? (34:21)
● Can one do a coinjoin in Shielded CSV? (24:02)
● In Bitcoin Core, how to use Tor for broadcasting new transactions only? (36:47)
● Brassard-Høyer-Tapp (BHT) algorithm and Bitcoin (BIP360) (38:31)
● Why does BitHash alternate sha256 and ripmed160? (39:24)
Releases and release candidates
● Libsecp256k1 0.7.1 (41:09)
Notable code and documentation changes
● Bitcoin Core #33822 (42:59)
● Bitcoin Core #34269 (44:50)
● Core Lightning #8850 (47:38)
● LDK #4349 (49:16)
● Rust Bitcoin #5470 (50:54)
● Rust Bitcoin #5443 (51:26)
● BDK #2037 (52:51)
● BIPs #2076 (55:49)
● BIPs #1500 (59:39)
More
Mark “Murch” Erhardt and Gustavo Flores Echaiz are joined by Liam Eagen to discuss Newsletter #390. News ● Argo: a garbled-circuits scheme with more efficient off-chain computation (0:48) ● LN-Symmetry update (26:05) Selected Q&A from Bitcoin Stack Exchange ● What is stored in dbcache and with what priority? (34:21) ● Can one do a coinjoin in Shielded CSV? (24:02) ● In Bitcoin Core, how to use Tor for broadcasting new transactions only? (36:47) ● Brassard-Høyer-Tapp (BHT) algorithm and Bitcoin (BIP360) (38:31) ● Why does BitHash alternate sha256 and ripmed160? (39:24) Releases and release candidates ● Libsecp256k1 0.7.1 (41:09) Notable code and documentation changes ● Bitcoin Core #33822 (42:59) ● Bitcoin Core #34269 (44:50) ● Core Lightning #8850 (47:38) ● LDK #4349 (49:16) ● Rust Bitcoin #5470 (50:54) ● Rust Bitcoin #5443 (51:26) ● BDK #2037 (52:51) ● BIPs #2076 (55:49) ● BIPs #1500 (59:39)