Bitcoin Optech Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by rkrux, Roland Bewick, and Steven Roose to discuss ⁠Newsletter #410⁠.News● Discussion of removing RBF signaling from wallet transactions (0:57) Changes to services and client software● Sparrow Wallet 2.5.0 adds silent payments receiving (59:55) ● Bark live on Bitcoin mainnet (29:46) ● Arké Ark wallet announced (32:18) ● Noah Ark wallet announced (31:52) ● Alby Hub v1.23.0 released (15:00) ● JoinMarket NG 0.32.0 released (1:01:02) Notable code and documentation changes● Bitcoin Core #35221 (1:02:13) ● Bitcoin Core #35254 (1:06:59) ● Bitcoin Core #35498 (1:09:26) ● Eclair #3318 (1:11:06) ● LND #10789 (1:13:05) ● Rust Bitcoin #6321 (1:14:09) ● LDK #4685 (1:16:14)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Vasil Dimov to discuss Newsletter #409.News● Draft BIP for testnet5 (0:31) Releases and release candidates● LND 0.21.0-beta (17:25) ● Core Lightning 26.06.1 (20:19) Notable code and documentation changes● Bitcoin Core #35410 (21:28) ● Bitcoin Core #34779 (38:00) ● Bitcoin Core #32150 (41:36) ● LDK #4647 (45:14) ● BTCPay Server #7218 (51:34) ● BIPs #2186 (53:07)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Pyth and Ademan to discuss Newsletter #408.News● A post-quantum path for BIP324 (37:15) ● Discussion of QR signing payloads for miniscript wallets (1:27) Changing consensus● CTV-only vault proof of concept (13:08) ● Post-quantum Lightning discussion (43:41) ● Quantum attack game theory (47:24) ● BIP54 64-byte transactions and potential legitimate uses (49:15) Releases and release candidates● Core Lightning 26.06 (1:11:15) Notable code and documentation changes● Bitcoin Core #35269 (1:15:42) ● Bitcoin Core #34644 (1:20:45) ● Bitcoin Core #34198 (1:22:21) ● LND #10813 (1:26:32) ● Rust Bitcoin #6250 (1:28:05) ● BOLTs #1338 (1:36:06) ● BOLTs #1326 (1:37:23)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Chandra Pratap to discuss Newsletter #407.News● Core Lightning assertion DoS disclosure (0:47) ● Bitcoin Core developer meeting transcripts (14:34) Releases and release candidates● Eclair v0.14.0 (20:30) ● Core Lightning 26.06rc2 (23:01) Notable code and documentation changes● Bitcoin Core #33966 (24:14) ● Bitcoin Core #34917 (28:04) ● Bitcoin Core #35017 (30:52) ● BIPs #1944 (35:25) ● BIPs #2108 (36:14) ● Eclair #3192 (39:28) ● LDK #4584 (40:28) ● LDK #4628 (41:27) ● LND #10552 (43:35) ● LND #10820 (48:52)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Oliver Gugger and 0xB10C to discuss Newsletter #406.News● Significant updates to BIP322 Generic Signed Message Format (1:17) ● TCP hole punching for Bitcoin nodes behind NATs (17:39) Changes to services and client software● Ibis Wallet announced (40:15) ● LDK Server announced (41:10) ● Mempool.space v3.3.0 released (42:06) ● peer-observer P2P monitoring tooling (32:28) Notable code and documentation changes● Bitcoin Core #29136 (43:27) ● Bitcoin Core #34893 (47:24) ● Bitcoin Core #34860 (48:20) ● Bitcoin Core #31298 (53:52) ● Bitcoin Core #28802 (57:04) ● Eclair #3298 (58:52) ● LDK #4575 (1:02:08) ● LND #10814 (1:03:13) ● Rust Bitcoin #6191 (1:04:35) ● BLIPs #42 (1:06:20)

Mark “Murch” Erhardt and Mike Schmidt are joined by Fabian Jahr to discuss ⁠Newsletter #405⁠.News● Bitcoin Core script interpreter remote crash disclosure (22:00) ● BIP proposal for UTXO set sharing over P2P network (0:42) Releases and release candidates● Core Lightning 26.06rc1 (34:58) Notable code and documentation changes● Bitcoin Core #35209 (36:44) ● BIPs #2116 (38:20) ● BIPs #2141 (44:13) ● Core Lightning #9116 (48:35) ● Core Lightning #9110 (50:27) ● LDK #4598 (52:10) ● LDK #4528 (53:30) ● LND #10612 (54:37) ● BTCPay Server #7354 (57:12) ● BDK #2195 (58:10) ● Bitcoin Inquisition #100 (1:00:00) ● BINANAs #20 (1:02:42)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Daniela Brozzoni, Naiyoma, and Thomas Voegtlin to discuss Newsletter #404.News● Possible solutions to node fingerprinting (1:14) ● Public fraud proof for just-in-time channels (19:21) Notable code and documentation changes● Bitcoin Core #33796 (37:11) ● Bitcoin Core #21283 (39:30)● BIPs #2150 (45:30) ● Eclair #3144 (52:30) ● Eclair #2887 (54:00) ● LDK #4592 (55:27) ● LND #9153 (56:52) ● Rust Bitcoin #5835 (58:02) ● BOLTs #995 (58:56) ● BOLTs #1228 (1:01:40) ● BOLTs #1327 (1:03:28)

Gustavo Flores Echaiz and Brandon Black are joined by Olaoluwa Osuntokun to discuss Newsletter #403.News● Binary fuse filters as an alternative to BIP158's GCS (19:05) Changing consensus● Post-quantum HD wallets with fallback SPHINCS keys (31:07) ● Discussion of a post-quantum output type (34:42) ● Proposal to embed post-quantum keys in tapscript without consensus changes (38:03) ● BIP54 demonstration of slow blocks on signet (43:28) ● Post-quantum BIP86 recovery using zk-STARK proofs of BIP32 seeds (1:05) Releases and release candidates● Core Lightning 26.04.1 (48:16) ● BTCPay Server 2.3.8 (50:15) ● BTCPay Server 2.3.9 (51:52) Notable code and documentation changes● Bitcoin Core #33671 (52:39) ● Bitcoin Core #34885 (58:01) ● Bitcoin Core #33920 (59:57) ● Bitcoin Core #34911 (1:02:00) ● BIPs #1548 (1:04:47) ● HWI #831 (1:08:17) ● BDK #2188 (1:09:11) ● BDK #2115 (1:10:14)

Mark “Murch” Erhardt and Gustavo Flores Echaiz are joined by Toby Sharp to discuss Newsletter #402.News● Hornet Node's declarative executable specification of Bitcoin consensus rules (1:02) ● Onion message jamming in the Lightning Network (23:22) Selected Q&A from Bitcoin Stack Exchange● Why did BIP342 replace CHECKMULTISIG with a new opcode, instead of just removing FindAndDelete from it? (40:58) ● Does SIGHASH_ANYPREVOUT commit to the tapleaf hash or the full taproot merkle path? (43:28) ● What does the BIP86 tweak guarantee in a MuSig2 Lightning channel, beyond address format? (45:23) Releases and release candidates● Bitcoin Core 31.0 (47:10) ● Core Lightning 26.04 (54:26) ● LND 0.21.0-beta.rc1 (56:35) Notable code and documentation changes● Bitcoin Core #33477 (57:55) ● Bitcoin Core #35006 (1:02:21) ● BIPs #1895 (1:04:31) ● BIPs #2142 (1:12:47) ● LDK #4555 (1:14:28) ● LND #10713 (1:16:23) ● LND #10754 (1:18:14)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Remix7531 and Luis Schwab to discuss Newsletter #401.News● Discussion of using nested MuSig2 in the Lightning Network (34:05) ● Formal verification of secp256k1 modular scalar multiplication (01:10) Changes to services and client software● Coldcard 6.5.0 adds MuSig2 and miniscript (40:56) ● Frigate 1.4.0 released (41:46) ● Bitcoin Backbone updates (47:10) ● Utreexod 0.5 released (16:18) ● Floresta 0.9.0 released (19:41) Releases and release candidates● Bitcoin Core 31.0rc4 (48:01) ● Core Lightning 26.04rc3 (49:00) Notable code and documentation changes● Bitcoin Core #34401 (50:01) ● Bitcoin Core #35032 (51:51) ● Core Lightning #9021 (55:33) ● Core Lightning #9046 (56:53) ● LDK #4515 (58:25) ● LDK #4558 (59:51) ● LND #9985 (1:01:53) ● BTCPay Server #7250 (1:04:07) ● BIPs #2089 (1:07:28)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Julian Moik to discuss ⁠Newsletter #400⁠.Bitcoin Core PR Review Club● Testing Bitcoin Core 31.0 Release Candidates (29:00) Notable code and documentation changes● Bitcoin Core #33908 (31:56) ● Eclair #3283 (37:06) ● LDK #4529 (38:12) ● LDK #4494 (39:55) ● LND #10666 (45:31) ● BIPs #2099 (46:40) ● BIPs #2118 (1:15) ● BIPs #2134 (51:08)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Armin Sabouri, Pyth, Conduition, and Jonas Nick to discuss Newsletter #399.News● Wallet fingerprinting risks for payjoin privacy (44:15) ● Draft BIP for a wallet backup metadata format (1:04:26) Changing consensus● Compact Isogeny PQC can replace HD wallets, key-tweaking, silent payments (24:23) ● Varops budget and tapscript leaf 0xc2 (aka Script Restoration) are BIPs 440 and 441 (1:13:24) ● SHRIMPS: 2.5 KB post-quantum signatures across multiple stateful devices (02:02) Releases and release candidates● Bitcoin Core 31.0rc2 (1:22:07) ● Core Lightning 26.04rc2 (1:23:32) ● BTCPay Server 2.3.7 (1:24:04) Notable code and documentation changes● Bitcoin Core #32297 (1:26:29) ● Bitcoin Core #34379 (1:28:54) ● Eclair #3269 (1:30:37) ● LDK #4486 (1:32:59) ● LDK #4428 (1:35:00) ● LND #9982 (1:37:13) ● LND #10063 (1:39:00)

Mike Schmidt and Gustavo Flores Echaiz are joined by Dusty Daemon to discuss ⁠Newsletter #398⁠.Selected Q&A from Bitcoin Stack Exchange● What is meant by Bitcoin doesn't use encryption? (28:44) ● When and why did Bitcoin Script shift to a commit–reveal structure? (30:26) ● Does P2TR-MS (Taproot M-of-N multisig) leak public keys? (31:50) ● Does OP_CHECKSIGFROMSTACK intentionally allow cross-UTXO signature reuse? (33:24) Releases and release candidates● Bitcoin Core 28.4 (35:05) ● Core Lightning 26.04rc1 (36:19) Notable code and documentation changes● Bitcoin Core #33259 (37:51) ● Bitcoin Core #33414 (39:49) ● Bitcoin Core #34846 (41:38) ● Core Lightning #8450 (13:39) ● Core Lightning #8856 (22:08) ● Eclair #3247 (44:21) ● LDK #4472 (25:00) ● LND #10602 (47:25) ● LND #10481 (49:38) ● BOLTs #1160 (0:51)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Matt Corallo, Gregory Sanders, and Sebastian van Staa to discuss ⁠Newsletter #397⁠.Changes to services and client software● Cake Wallet adds Lightning support (1:06:09) ● Sparrow 2.4.0 and 2.4.2 released (1:13:15) ● Blockstream Jade adds Lightning via Liquid (1:15:33) ● Lightning Labs releases agent tools (14:49) ● Tether launches MiningOS (1:17:38) ● FIBRE network relaunched (1:35) ● TUI for Bitcoin Core released (1:19:34) Releases and release candidates● Bitcoin Core 31.0rc1 (28:24) ● BTCPay Server 2.3.6 (1:20:55) Notable code and documentation changes● Bitcoin Core #31560 (1:21:55) ● Bitcoin Core #31774 (1:23:35) ● Core Lightning #8817 (1:25:12) ● Eclair #3265 (1:27:41) ● LDK #4427 (22:36) ● LDK #4484 (23:45) ● BIPs #1974 (49:52)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Jonathan Harvey-Buschel to discuss ⁠Newsletter #396⁠.News● Collision-resistant hash function for Bitcoin Script (0:30) ● Continued discussion of Gossip Observer traffic analysis tool (8:58) Releases and release candidates● BDK wallet 3.0.0-rc.1 (28:04) Notable code and documentation changes● Bitcoin Core #26988 (30:39) ● Bitcoin Core #34692 (32:22) ● LDK #4304 (33:21) ● LDK #4416 (35:41) ● LND #10089 (38:01) ● Libsecp256k1 #1777 (39:46) ● BIPs #2047 (42:39) ● BOLTs #1316 (46:42) ● BOLTs #1312 (47:26)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Jon McAlpine, Antoine Poinsot, Mike Casey, and Ethan Heilman to discuss Newsletter #395.News● A standard for stateless VTXO verification (1:31) ● Draft BIP for expanded `nVersion` nonce space for miners (1:23:45) Changing consensus● Extensions to standard tooling for TEMPLATEHASH-CSFS-IK support (13:52) ● Hourglass V2 update (25:40) ● Algorithm agility for Bitcoin (51:15) ● The limitations of cryptographic agility in Bitcoin (1:05:15) Releases and release candidates● Bitcoin Core 28.4rc1 (1:36:53) Notable code and documentation changes● Bitcoin Core #33616 (1:38:30) ● Bitcoin Core #34616 (1:42:23) ● Eclair #3256 (1:46:20) ● Eclair #3258 (1:48:34) ● Eclair #3255 (1:50:14) ● LDK #4402 (1:52:27) ● LND #10604 (1:53:56) ● BIPs #1699 (1:55:34) ● BIPs #2106 (1:57:30) ● BIPs #2068 (2:01:28) ● BOLTs #1301 (2:04:54)

Mark “Murch” Erhardt and Mike Schmidt are joined by Craig Raw and Fabian Jahr to discuss Newsletter #393.News● Draft BIP for output script descriptor annotations (1:25) Selected Q&A from Bitcoin Stack Exchange● Is Bitcoin BIP324 v2 P2P transport distinguishable from random traffic? (35:16) ● What if a miner just broadcasts the header and never gives the block? (39:53) Releases and release candidates● Bitcoin Core 28.4rc1 (47:27) ● Rust Bitcoin 0.33.0-beta (47:46) Notable code and documentation changes● Bitcoin Core #34568 (48:48) ● Bitcoin Core #34184 (50:37) ● Bitcoin Core #24539 (51:57) ● Bitcoin Core #34329 (54:56) ● Bitcoin Core #28792 (15:35) ● Bitcoin Core #32138 (54:56) ● Bitcoin Core #34512 (56:44) ● Core Lightning #8490 (58:16) ● Eclair #3250 (59:07) ● LDK #4373 (59:55) ● BDK #2081 (1:02:13)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Misha Komarov, Erik De Smedt, and arbedout to discuss ⁠Newsletter #393⁠.News● Recent OP_RETURN output statistics (45:54) ● Bitcoin PIPEs v2 (1:33) Changes to services and client software● Second releases hArk-based Ark software (20:21) ● Amboss announces RailsX (55:35) ● Nunchuk adds silent payment support (56:11) ● Electrum adds submarine swap features (58:08) ● Sigbash v2 announced (33:56) Releases and release candidates● BTCPay Server 2.3.5 (1:00:11) ● LND 0.20.1-beta (1:01:43) Notable code and documentation changes● Bitcoin Core #33965 (1:02:55) ● Eclair #3248 (1:05:55) ● Eclair #3246 (1:07:08) ● LDK #4335 (1:08:52) ● LDK #4318 (1:14:32) ● LND #10542 (1:15:55) ● BIPs #1670 (1:17:02) ● BOLTs #1236 (1:27:50) ● BOLTs #1289 (1:29:10)

Mark “Murch” Erhardt and Gustavo Flores Echaiz are joined by Sebastian Falbesoner and Oleksandr Kurbatov to discuss ⁠Newsletter #392⁠.News● Proposal to limit the number of per-group silent payment recipients (1:13) ● BLISK, Boolean circuit Logic Integrated into the Single Key (26:43) Releases and release candidates● Bitcoin Core 29.3 (49:18) ● LDK 0.2.2 (51:16) ● HWI 3.2.0 (52:20) ● Bitcoin Inquisition 29.2 (53:54) Notable code and documentation changes● Bitcoin Core #32420 (56:05) ● Core Lightning #8772 (1:02:29) ● LND #10507 (1:03:56) ● LDK #4387 (1:05:48) ● LDK #4355 (1:08:14) ● LDK #4354 (1:09:21) ● LDK #4303 (1:10:52) ● HWI #784 (1:13:10) ● BIPs #2092 (1:15:02) ● BIPs #2004 (1:16:33) ● BIPs #2017 (1:19:44) ● Bitcoin Inquisition #99 (1:26:53)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Toby Sharp, Chris Hyunhum Cho, Jonas Nick, and Antoine Poinsot to discuss ⁠Newsletter #391⁠.News● A constant-time parallelized UTXO database (25:40) ● Bithoven: A formally verified, imperative language for Bitcoin Script (44:48) ● Discussion of dust attack mitigations (1:43:33) Changing consensus● SHRINCS: 324-byte stateful post-quantum signatures with static backups (1:30) ● Addressing remaining points on BIP54 (1:10:08) ● Falcon post-quantum signature scheme proposal (20:05) ● SLH-DSA verification can compete with ECC (23:28) Releases and release candidates● LDK 0.1.9 (1:50:27) Notable code and documentation changes● Bitcoin Core #33604 (1:53:10) ● Bitcoin Core #34358 (1:54:58) ● Core Lightning #8824 (1:56:20) ● Eclair #3244 (1:58:17) ● LDK #4263 (2:00:07) ● LDK #4300 (2:01:54) ● LND #10473 (2:03:57) ● Rust Bitcoin #5493 (2:07:36)

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)

Mark “Murch” Erhardt and Mike Schmidt are joined by René Pickhardt to discuss ⁠Newsletter #389⁠.News● A mathematical theory of payment channel networks (0:31) Changes to services and client software● Electrum server for testing silent payments (30:04) ● BDK WASM library (33:28) Releases and release candidates● Core Lightning 25.12.1 (35:14) ● LND 0.20.1-beta.rc1 (39:14) Notable code and documentation changes● Bitcoin Core #32471 (40:57) ● Bitcoin Core #34146 (42:02) ● Core Lightning #8831 (45:00) ● LDK #4261 (45:35) ● LDK #4152 (46:24) ● LND #10488 (47:42) ● LND #10331 (48:43) ● Rust Bitcoin #5402 (49:06) ● BIPs #1820 (50:39) ● BOLTs #1306 (51:41) ● BLIPs #59 (53:05)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Bruno Garcia to discuss ⁠Newsletter #388⁠.News● An overview of incremental mutation testing in Bitcoin Core (0:43) ● BIP process updated (18:53) Releases and release candidates● Bitcoin Core 30.2 (26:31) ● BTCPay Server 2.3.3 (27:23) Notable code and documentation changes● Bitcoin Core #33819 (28:42) ● Bitcoin Core #29415 (31:44) ● Core Lightning #8830 (42:16) ● Eclair #3233 (44:19) ● Eclair #3237 (47:59) ● LDK #4232 (50:00) ● LND #10296 (52:24) ● BTCPay Server #7068 (53:43) ● BIPs #1982 (55:37)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by René Pickhardt and Craig Raw to discuss ⁠Newsletter #387⁠.News● Bitcoin Core wallet migration bug (0:55) ● Using Ark as a channel factory (7:47) ● Draft BIP for silent payment descriptors (29:02) Releases and release candidates● Bitcoin Core 30.2rc1 (58:34) Notable code and documentation changes● Bitcoin Core #34156 (59:32) ● Bitcoin Core #34085 (1:03:54) ● Bitcoin Core #34197 (1:07:43) ● Bitcoin Core #33135 (1:09:10) ● LDK #4213 (1:11:02) ● Eclair #3217 (1:15:39) ● LND #10367 (1:18:49) ● Rust Bitcoin #5450 (1:22:51) ● Rust Bitcoin #5434 (1:23:40)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Anthony Towns and Mikhail Kudinov to discuss ⁠Newsletter #386⁠.News● Building a vault using blinded co-signers (1:04:09) ● Peer feature negotiation (1:40) Changing consensus● Year 2106 timestamp overflow uint64 migration (1:07:47) ● Relax BIP54 timestamp restriction for 2106 soft fork (1:11:36) ● Understanding and mitigating a CTV footgun (1:16:30) ● CTV activation meeting (1:21:00) ● `OP_CHECKCONSOLIDATION` to enable cheaper consolidations (1:23:11) ● Hash-based signatures for Bitcoin's post-quantum future (20:47) Releases and release candidates● BTCPay Server 2.3.0 (1:28:29) Notable code and documentation changes● Bitcoin Core #33657 (1:30:25) ● Bitcoin Core #32414 (1:33:23) ● Bitcoin Core #32545 (1:39:18) ● Bitcoin Core #33892 (1:42:13) ● Core Lightning #8784 (1:44:35) ● LND #9489 (1:45:54) ● BIPs #2051 (1:50:09) ● BOLTs #1299 (1:56:39) ● BOLTs #1305 (1:59:46)

Mark “Murch” Erhardt and Mike Schmidt are joined by Bastien Teinturier, Rearden Code, and Pieter Wuille to discuss Newsletter #385: 2025 Year-in-Review Special.January● Updated ChillDKG draft (43:08) ● Offchain DLCs (45:53) ● Compact block reconstructions (2:29:27) February● Erlay update (1:53:55) ● LN ephemeral anchor scripts (0:50) ● Probabilistic payments (54:45) March● Bitcoin Forking Guide (3:29:35) ● Private block template marketplace to prevent centralizing MEV (3:05:28) ● LN upfront and hold fees using burnable outputs (13:12) April● SwiftSync speedup for initial block download (2:09:35) ● DahLIAS interactive aggregate signatures (3:26:02) Summary 2025: Quantum (58:07) May● Cluster mempool (1:22:11) ● Increasing or removing Bitcoin Core’s OP_RETURN policy limit (2:45:43) June● Calculating the selfish mining danger threshold (2:20:39) ● Fingerprinting nodes using addr messages (3:11:38) ● Garbled locks (3:19:01) Summary 2025: Soft fork proposals (26:57) July● Chain code delegation (49:07) August● Utreexo draft BIPs (2:15:57) ● Lowering the minimum relay feerate (2:39:52) ● Peer block template sharing (2:56:01) ● Differential fuzzing of Bitcoin and LN implementations (3:16:08) Summary 2025: Stratum v2 (2:04:49) September● Details about the design of Simplicity (3:23:01) ● Partitioning and eclipse attacks using BGP interception (3:13:47) October● Discussions about arbitrary data (3:01:15) ● Channel jamming mitigation simulation results and updates (11:05) November● Comparing performance of ECDSA signature validation in OpenSSL vs. libsecp256k1 (2:01:47) ● Modeling stale rates by propagation delay and mining centralization (2:22:32) ● BIP3 and the BIP process (3:31:37) ● Bitcoin Kernel C API introduced (3:35:35) December● Splicing (7:33)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Matt Morehouse and Salvatore Ingala to discuss ⁠Newsletter #384⁠.News● Critical vulnerabilities fixed in LND 0.19.0 (0:59) ● A virtualized secure enclave for hardware signing devices (21:11) Changes to services and client software● Interactive transaction visualization tool (37:16) ● BlueWallet v7.2.2 released (38:20) ● Stratum v2 updates (38:42) ● Auradine announces Stratum v2 support (40:18) ● LDK Node 0.7.0 released (41:58) ● BIP-329 Python Library 1.0.0 release (43:30) ● Bitcoin Safe 1.6.0 released (44:34) Selected Q&A from Bitcoin Stack Exchange● Does a clearnet connection to my Lightning node require a TLS certificate? (45:12) ● Why do different implementations produce different DER signatures for the same private key and hash? (45:58) ● Why is the miniscript `after` value limited at 0x80000000? (49:27) Notable code and documentation changes● Bitcoin Core #33528 (53:12) ● Bitcoin Core #33723 (54:17) ● Bitcoin Core #33993 (56:35) ● Bitcoin Core #33553 (59:54) ● Eclair #3220 (1:01:52) ● LDK #4231 (1:02:48) ● LND #10396 (1:05:40) ● BTCPay Server #7022 (1:08:26) ● Rust Bitcoin #5379 (1:09:32) ● BIPs #2050 (1:10:06)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Moonsettler and Julian to discuss Newsletter #383.News● Consensus bug in NBitcoin library (1:04) Changing consensus● LNHANCE soft fork (24:00) ● Benchmarking the varops budget (5:09) ● SLH-DSA (SPHINCS) post-quantum signature optimizations (45:29) Releases and release candidates● Core Lightning v25.12 (1:02:24) ● LDK 0.2 (1:03:43) Notable code and documentation changes● Core Lightning #8728 (1:05:14) ● Core Lightning #8702 (1:06:55) ● Core Lightning #8735 (1:07:24) ● LDK #4226 (1:11:41) ● LND #10341 (1:12:49) ● BTCPay Server #6986 (1:14:00) ● BIPs #2015 (1:16:18)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt discuss ⁠Newsletter #382⁠.News● Stats on compact block reconstructions updates (0:34) ● Motion to activate BIP3 (7:26) Selected Q&A from Bitcoin Stack Exchange● Do pruned nodes store witness inscriptions? (24:27) ● Increasing probability of block hash collisions when difficulty is too high (29:33) ● What is the purpose of the initial 0x04 byte in all extended public and private keys? (33:25) Releases and release candidates● LND v0.20.0-beta (34:57) ● Core Lightning v25.12rc1 (35:57) Notable code and documentation changes● Bitcoin Core #33872 (37:55) ● Bitcoin Core #33629 (42:05) ● Core Lightning #8677 (49:49) ● Core Lightning #8546 (51:28) ● Core Lightning #8682 (53:19) ● LDK #4197 (55:39) ● LDK #4234 (1:00:56) ● LDK #4148 (1:02:17) ● BDK #2027 (1:03:04)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Antoine Poinsot and ZmnSCPxj to discuss Newsletter #381.News● Modeling stale rates by propagation delay and mining centralization (1:03) ● Private key handover for collaborative closure (30:55) Changes to services and client software● Arkade launches (52:32) ● Mempool monitoring mobile application (55:25) ● Web-based policy and miniscript IDE (56:25) ● Phoenix Wallet adds taproot channels (57:45) ● Nunchuk 2.0 launches (59:19) ● LN gossip traffic analysis tool announced (1:01:49) Notable code and documentation changes● Bitcoin Core #33745 (1:04:23) ● Core Lightning #8537 (1:09:28) ● Core Lightning #8608 (1:11:26) ● Core Lightning #8646 (1:13:34) ● Core Lightning #8569 (1:17:44) ● Core Lightning #8558 (1:22:46) ● LDK #4126 (1:24:11) ● LDK #4208 (1:26:37) ● LND #9432 (1:27:58) ● BOLTs #1284 (1:31:38) ● BOLTs #1044 (1:33:33)

Mark “Murch” Erhardt and Mike Schmidt are joined by TheCharlatan to discuss Newsletter #380.Releases and release candidates● LND 0.20.0-beta.rc4 (1:30) Notable code and documentation changes● Bitcoin Core #30595 (2:56) ● Bitcoin Core #33443 (28:03) ● Core Lightning #8656 (29:42) ● Core Lightning #8671 (30:22) ● LDK #4204 (33:09) ● BIPs #2022 (34:45)

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Sebastian Falbesoner, PortlandHODL, Tadge Dryja, and Antoine Poinsot to discuss Newsletter #379.News● Comparing performance of ECDSA signature validation in OpenSSL vs. libsecp256k1 (1:47) Changing consensus● Multiple discussions about restricting data (14:05) ● Post-quantum signature aggregation (1:00:05) ● Native STARK proof verification in Bitcoin Script (1:18:47) ● BIP54 implementation and test vectors (35:47) Releases and release candidates● Core Lightning 25.09.2 (1:30:54) ● LND 0.20.0-beta.rc3 (1:31:44) Notable code and documentation changes● Bitcoin Core #31645 (1:32:34) ● Core Lightning #8636 (1:40:08) ● Core Lightning #8639 (1:43:18) ● Core Lightning #8635 (1:44:31) ● Eclair #3209 (1:46:25) ● Eclair #3206 (1:46:59) ● Eclair #3210 (1:49:31) ● LDK #4140 (1:54:13) ● LDK #4168 (1:59:12) ● Rust Bitcoin #5116 (2:01:06) ● BTCPay Server #6922 (2:05:05)

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #378.News● CPU DoS from unconfirmed transaction processing (1:00) Selected Q&A from Bitcoin Stack Exchange● Why was -datacarriersize redefined in 2022, and why was the 2023 proposal to expand it not merged? (17:53) ● What is the smallest valid transaction that can be included in a block? (22:59) ● Why does Bitcoin Core continue to give witness data a discount even when it is used for inscriptions? (25:38) ● The ever-growing Bitcoin blockchain size? (39:17) ● I read that OP_TEMPLATEHASH is a variant of OP_CTV. How do they differ? (44:59) Releases and release candidates● LND 0.20.0-beta.rc1 (49:59) ● Eclair 0.13.1 (50:43) Notable code and documentation changes● Bitcoin Core #29640 (51:21) ● Core Lightning #8400 (54:15) ● Eclair #3173 (54:53) ● LND #10280 (56:56) ● BIPs #2006 (57:27) ● BIPs #1975 (1:00:58)

Gustavo Flores Echaiz and Mike Schmidt are joined by Abubakar Sadiq Ismail and Carla Kirk-Cohen to discuss ⁠Newsletter #377⁠.News● Detecting block template feerate increases using cluster mempool (1:06) ● Channel jamming mitigation simulation results and updates (9:28) Changes to services and client software● BULL wallet launches (37:22) ● Sparrow 2.3.0 released (39:40) Releases and release candidates● Core Lightning 25.09.1 (40:47) ● Bitcoin Core 28.3 (41:18) Notable code and documentation changes● Bitcoin Core #33157 (43:00) ● Bitcoin Core #29675 (45:56) ● Bitcoin Core #33517 (46:59) ● Eclair #2792 (49:01) ● LDK #4122 (51:01) ● LND #9868 (52:37) ● LND #10273 (53:48)

Gustavo Flores Echaiz and Mike Schmidt are joined by Francesco Madonna and supertestnet to discuss Newsletter #376.News● Continued discussion of block template sharing (17:30) ● B-SSL a Secure Bitcoin Signing Layer (2:54) Releases and release candidates● Bitcoin Core 30.0 (22:32) ● Bitcoin Core 29.2 (28:44) ● LDK 0.1.6 (29:37) Notable code and documentation changes● Eclair #3184 (30:59) ● Core Lightning #8597 (32:25) ● LDK #4117 (34:05) ● LDK #4077 (35:03) ● LDK #4154 (36:47)

Gustavo Flores Echaiz and Mike Schmidt are joined by Sindura Saraswathi, ZmnSCPxj, and Eugene Siegel to discuss ⁠Newsletter #375⁠.News● Optimal Threshold Signatures (1:56) ● Flattening certain nested threshold signatures (14:33) ● Theoretical limitations on embedding data in the UTXO set (38:14) Bitcoin Core PR Review Club● Compact block harness (27:12) Releases and release candidates● Bitcoin Inquisition 29.1 (45:01) Notable code and documentation changes● Bitcoin Core #33453 (47:16) ● Bitcoin Core #33504 (51:52) ● Core Lightning #8563 (53:55) ● Core Lightning #8523 (56:55) ● Core Lightning #8398 (58:22) ● LDK #4120 (59:47) ● LND #10254 (1:01:35)

Mark “Murch” Erhardt and Mike Schmidt are joined by Gustavo Flores Echaiz to discuss Newsletter #374.Changing consensus● Draft BIPs for Script Restoration (0:40) Releases and release candidates● Bitcoin Core 30.0rc2 (19:19) ● bdk-wallet 2.2.0 (23:39) ● LND v0.20.0-beta.rc1 (24:15) Notable code and documentation changes● Bitcoin Core #33229 (25:03) ● Bitcoin Core #33446 (26:55) ● LDK #3838 (28:11) ● LDK #4098 (30:40) ● LDK #4106 (33:40) ● LDK #4096 (35:43) ● LND #10133 (37:24) ● BDK #2029 (39:08) ● BIPs #1911 (42:15)

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse, Daniela Brozzoni, and Gustavo Flores Echaiz to discuss Newsletter #373.News● Eclair vulnerability (18:50) ● Research into feerate settings (0:35) Selected Q&A from Bitcoin Stack Exchange● Implications of OP_RETURN changes in upcoming Bitcoin Core version 30.0? (28:27) ● If OP_RETURN relay limits are ineffective, why remove the safeguard instead of keeping it as a default discouragement? (42:12) ● What are the worst-case stress scenarios from uncapped OP_RETURNs in Bitcoin Core v30? (43:25) ● If OP_RETURN needed more room, why was the 80-byte cap removed instead of being raised to 160? (50:39) ● If arbitrary data is inevitable, does removing OP_RETURN limits shift demand toward more harmful storage methods (like UTXO-inflating addresses)? (59:48) ● If OP_RETURN uncapping doesn’t increase the UTXO set, how does it still contribute to blockchain bloat and centralization pressure? (1:00:17) ● How does uncapping OP_RETURN impact long-term fee-market quality and security budget? (1:02:11) ● Assurance blockchain will not suffer from illegal content with 100KB OP_RETURN? (1:04:34) ● What analysis shows OP_RETURN uncapping won’t harm block propagation or orphan risk? (1:05:25) ● Where does Bitcoin Core keep the XOR obfuscation keys for both block data files and level DB indexes? (1:06:10) ● How robust is 1p1c transaction relay in bitcoin core 28.0? (1:06:34) ● How can I allow getblocktemplate to include sub 1 sat/vbyte transactions? (1:10:37) Releases and release candidates● Bitcoin Core 30.0rc1 (1:13:00) Notable code and documentation changes● Bitcoin Core #33333 (1:15:26) ● Bitcoin Core #28592 (1:18:36) ● Eclair #3171 (1:22:33) ● Eclair #3175 (1:26:41) ● LDK #4064 (1:29:36) ● LDK #4067 (1:31:04) ● LDK #4046 (1:32:43) ● LDK #4083 (1:35:27) ● LND #10189 (1:38:23) ● BIPs #1963 (1:41:17)

Mark “Murch” Erhardt and Mike Schmidt are joined by ZmnSCPxj and Constantine Doumanidis to discuss Newsletter #372.News● LSP-funded redundant overpayments (16:24) ● Partitioning and eclipse attacks using BGP interception (1:02) Changes to services and client software● Zero-knowledge proof of reserve tool (13:49) ● Alternative submarine swap protocol proof of concept (15:12) Releases and release candidates● Bitcoin Core 30.0rc1 (39:14) ● BDK Chain 0.23.2 (1:16:28) Notable code and documentation changes● Bitcoin Core #33268 (1:17:19) ● Eclair #3157 (1:18:56) ● LND #9975 (1:19:52) ● LND #9677 (1:20:21) ● LDK #4045 (1:20:41) ● LDK #4049 (1:20:32) ● BDK #1582 (1:22:18) ● BDK #2000 (1:23:13) ● BDK #2028 (1:24:17)

Mark “Murch” Erhardt and Mike Schmidt are joined by Jonas Nick and Bastien Teinturier to discuss Newsletter #370.News● Provable Cryptography Workbook (0:48) Releases and release candidates● Bitcoin Core 29.1 (10:48) ● Eclair v0.13.0 (11:17) ● Bitcoin Core 30.0rc1 (25:27) Notable code and documentation changes● Bitcoin Core #30469 (33:18) ● Eclair #3163 (33:18) ● Eclair #2308 (40:27) ● Eclair #3021 (45:18) ● Eclair #3142 (48:08) ● LDK #4053 (50:30) ● LDK #3886 (58:12)

Mark “Murch” Erhardt and Mike Schmidt are joined by Russell O’Connor, Olaoluwa Osuntokun, and Jeremy Rubin to discuss Newsletter #370.Changing consensus● Details about the design of Simplicity (37:56) ● Draft BIP for adding elliptic curve operations to tapscript (1:52) ● Draft BIP for OP_TWEAKADD (19:23) Releases and release candidates● Core Lightning v25.09 (59:40) ● Bitcoin Core 29.1rc2 (1:00:24) Notable code and documentation changes● LDK #3726 (1:00:55) ● LDK #4019 (1:02:24) ● LND #9455 (1:03:09) ● LND #10103 (1:04:00) ● HWI #795 (1:05:20)

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #368.News● Draft BIP for block template sharing (0:30) ● Trusted delegation of script evaluation (28:07) Changes to services and client software● ZEUS v0.11.3 released (33:07) ● Rust Utreexo resources (33:25) ● Peer-observer tooling and call to action (34:11) ● Bitcoin Core Kernel-based node announced (37:22) ● SimplicityHL released (38:23) ● LSP plugin for BTCPay Server (39:17) ● Proto mining hardware and software announced (39:42) ● Oracle resolution demo using CSFS (40:46) ● Relai adds taproot support (41:11) Releases and release candidates● LND v0.19.3-beta (43:09) ● Bitcoin Core 29.1rc1 (43:29) ● Core Lightning v25.09rc2 (43:55) Notable code and documentation changes● Bitcoin Core #32896 (44:33) ● Bitcoin Core #33106 (46:57) ● Core Lightning #8467 (1:02:49) ● Core Lightning #8354 (1:03:26) ● Eclair #3103 (1:04:07) ● Eclair #3134 (1:04:43) ● LDK #3897 (1:05:56)

Mark “Murch” Erhardt and Mike Schmidt are joined by Bruno Garcia and Liam Eagen to discuss Newsletter #369.News● Update on differential fuzzing of Bitcoin and LN implementations (24:56) ● Garbled locks for accountable computing contracts (0:58) Selected Q&A from Bitcoin Stack Exchange● Is it possible to recover a private key from an aggregate public key under strong assumptions? (39:45) ● Are all taproot addresses vulnerable to quantum computing? (41:24) ● Why cant we set the chainstate obfuscation key? (45:20) ● Is it possible to revoke a spending branch after a block height? (52:09) ● Configure Bitcoin Core to use onion nodes in addition to IPv4 and IPv6 nodes? (53:45) Releases and release candidates● Bitcoin Core 29.1rc2 (54:22) ● Core Lightning v25.09rc4 (56:45) Notable code and documentation changes● Bitcoin Core #31802 (57:37) ● LDK #3979 (1:04:46) ● LND #10102 (1:06:19) ● Rust Bitcoin #4907 (1:07:04)

Mark “Murch” Erhardt and Mike Schmidt discuss ⁠Newsletter #367⁠.Releases and release candidates● LND v0.19.3-beta.rc1 (0:19) ● Bitcoin Core 29.1rc1 (0:46) Notable code and documentation changes● Bitcoin Core #33050 (2:38) ● Bitcoin Core #32473 (11:04)● Bitcoin Core #33077 (17:57) ● Core Lightning #8389 (22:03)

Gloria Zhao and Mike Schmidt are joined by Tadge Dryja and Anthony Towns to discuss ⁠Newsletter #366⁠.News● Draft BIPs proposed for Utreexo (1:03) ● Continued discussion about lowering the minimum relay feerate (23:43) ● Peer block template sharing to mitigate problems with divergent mempool policies (52:27) Bitcoin Core PR Review Club● Add exportwatchonlywallet RPC to export a watchonly version of a wallet (1:11:41)Optech recommends (1:15:50) Releases and release candidates● LND v0.19.3-beta.rc1 (1:17:04) ● BTCPay Server 2.2.0 (1:17:44) ● Bitcoin Core 29.1rc1 (1:18:13) Notable code and documentation changes● Bitcoin Core #32941 (1:21:11) ● Bitcoin Core #31385 (1:24:06) ● Bitcoin Core #31244 (1:26:38) ● Bitcoin Core #30635 (1:29:54) ● Bitcoin Core #28944 (1:32:29) ● Eclair #3133 (1:35:08) ● LND #10097 (1:36:23) ● LND #9625 (1:38:12) ● Rust Bitcoin #4730 (1:38:43) ● BLIPs #55 (1:40:57) Correction (1:42:03)

Mark “Murch” Erhardt and Mike Schmidt are joined by David Gumberg, Lauren Shareshian, Jameson Lopp, Steven Roose, and Tim Ruffing to discuss Newsletter #365.News● Testing compact block prefilling (1:13:00) ● Mempool-based fee estimation library (1:33:53) Changing consensus● Migration from quantum-vulnerable outputs (49:17) ● Taproot-native `OP_TEMPLATEHASH` proposal (1:13) ● Proposal to allow longer relative timelocks (12:57) ● Security against quantum computers with taproot as a commitment scheme (23:48) Releases and release candidates● Bitcoin Core 29.1rc1 (1:46:55) Notable code and documentation changes● Bitcoin Core #29954 (1:48:12) ● Bitcoin Core #33004 (1:49:13) ● LDK #3246 (1:52:37) ● LDK #3892 (1:53:35) ● LDK #3662 (1:54:31)

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse and Jesse Posner to discuss ⁠Newsletter #364⁠.News● LND gossip filter DoS vulnerability (0:53) ● Chain code withholding for multisig scripts (15:16) ● Research indicates common Bitcoin primitives are compatible with quantum-resistant signature algorithms (38:46) Selected Q&A from Bitcoin Stack Exchange● How does Bitcoin Core handle reorgs larger than 10 blocks? (57:36) ● Advantages of a signing device over an encrypted drive? (1:01:29) ● Spending a taproot output through the keypath and scriptpath? (1:03:21) Releases and release candidates● Libsecp256k1 v0.7.0 (1:04:26) Notable code and documentation changes● Bitcoin Core #32521 (1:05:16) ● Bitcoin Core #31829 (1:15:00) ● LDK #3801 (1:19:51) ● LDK #3842 (1:21:11) ● BIPs #1890 (1:21:57) ● BOLTs #1232 (1:23:53)

Mark “Murch” Erhardt and Mike Schmidt are joined by Davidson Souza to discuss ⁠Newsletter #363⁠.Changes to services and client software● Floresta v0.8.0 released (0:45) ● RGB v0.12 announced (20:38) ● FROST signing device available (25:34) ● Gemini adds taproot support (29:44) ● Electrum 4.6.0 released (38:14) Releases and release candidates● LND v0.19.2-beta (38:51) Notable code and documentation changes● Bitcoin Core #32604 (39:38) ● Bitcoin Core #32618 (40:55) ● Bitcoin Core #31553 (43:03) ● Core Lightning #7725 (46:53) ● Eclair #2716 (47:23) ● LDK #3628 (52:19) ● LDK #3890 (53:22) ● LND #10001 (54:30)

Mark “Murch” Erhardt and Mike Schmidt are joined by Josh Doman and Gloria Zhao to discuss ⁠Newsletter #362⁠.News● Compressed descriptors (0:34) Bitcoin Core PR Review Club● Improve TxOrphanage denial of service bounds (9:14) Releases and release candidates● LND v0.19.2-beta.rc2 (46:22) Notable code and documentation changes● Core Lightning #8377 (47:17) ● BDK #1957 (50:41) ● BIPs #1888 (51:18)

Sanket Kanjalkar, Jonas Nick, Tadge Dryja, Steven Roose, and Brandon Black join Mark “Murch” Erhardt and Mike Schmidt to discuss Newsletter #361.News● Separating onion message relay from HTLC relay (2:06) Changing consensus● CTV+CSFS advantages for PTLCs (5:45) ● Vault output script descriptor (15:21) ● Continued discussion about CTV+CSFS advantages for BitVM (22:57) ● Open letter about CTV and CSFS (27:59) ● OP_CAT enables Winternitz signatures (1:12:27) ● Commit/reveal function for post-quantum recovery (1:22:46) ● OP_TXHASH variant with support for transaction sponsorship (1:53:31) Notable code and documentation changes● Bitcoin Core #32540 (2:13:29) ● Bitcoin Core #32638 (2:14:47) ● Bitcoin Core #32819 (2:15:25) ● LDK #3618 (2:17:41)