Bitcoin Optech Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Jonas Nick and Pieter Wuille to discuss ⁠Newsletter #312⁠. News Distributed key generation protocol for FROST (1:37) Introduction to cluster linearization (28:45) Changes to services and client software ZEUS adds BOLT12 offers and BIP353 support (56:15) Phoenix adds BOLT12 offers and BIP353 support (57:02) Stack Wallet adds RBF and CPFP support (57:42) BlueWallet adds silent payment send support (57:59) BOLT12 Playground announced (59:10) Moosig testing repository announced (59:56) Real-time Stratum visualization tool released (1:01:01) BMM 100 Mini Miner announced (1:01:57) Coldcard publishes URL-based transaction broadcast specification (1:02:32) Notable code and documentation changes Bitcoin Core #26596 (1:09:38) Core Lightning #7455 (1:11:27) Eclair #2878 (1:11:58) Rust Bitcoin #2646 (1:13:03) BDK #1489 (1:13:55) BIPs #1599 (1:15:22) BOLTs #1173 (1:17:50) BLIPs #25 (1:18:50)

Mark “Murch” Erhardt and Mike Schmidt are joined by Vojtěch Strnad and Fabian Jahr to discuss Newsletter #311. News (1:00) Bitcoin Core PR Review Club Testnet4 including PoW difficulty adjustment fix (15:14) Releases and release candidates Bitcoin Core 26.2 (37:23) LND v0.18.2-beta (37:42) Notable code and documentation changes Rust Bitcoin #2949 (40:04) BDK #1487 (41:20)

Mark “Murch” Erhardt and Mike Schmidt are joined by Antoine Poinsot and Elle Mouton to discuss ⁠Newsletter #310⁠. News Disclosure of vulnerabilities affecting Bitcoin Core versions before 0.21.0 (0:59) Adding a BOLT11 invoice field for blinded paths (22:17) Releases and release candidates Bitcoin Core 26.2rc1 (36:43) Notable code and documentation changes Bitcoin Core #28167 (37:48) Bitcoin Core #30007 (39:07) Bitcoin Core #30200 (40:37) Core Lightning #7342 (41:33) LND #8796 (42:55) LDK #3125 (45:26) BIPs #1610 (46:21) BIPs #1540 (49:07)

Mark “Murch” Erhardt and Mike Schmidt are joined by René Pickhardt to discuss ⁠Newsletter #309⁠. News Estimating the likelihood that an LN payment is feasible (1:04) Selected Q&A from Bitcoin Stack Exchange How is the progress of Initial Block Download (IBD) calculated? (31:25) What is `progress increase per hour` during synchronization? (33:50) Should an even Y coordinate be enforced after every key-tweak operation, or only at the end? (34:45) Signet mobile phone wallets? (37:28) What block had the most transaction fees? Why? (39:01) bitcoin-cli listtransactions fee amount is way off, why? (41:48) Did uncompressed public keys use the `04` prefix before compressed public keys were used? (44:57) What happens if an HTLC's value is below the dust limit? (46:34) How does subtractfeefrom work? (47:11) What's the difference between the 3 index directories blocks/index/, bitcoin/indexes and chainstate? (51:19) Releases and release candidates LND v0.18.1-beta (52:18) Bitcoin Core 26.2rc1 (53:02) Notable code and documentation changes Bitcoin Core #29575 (53:29) Bitcoin Core #28984 (56:38) Core Lightning #7388 (1:00:28) LND #8734 (1:03:24) LDK #3127 (1:03:59) Rust Bitcoin #2794 (1:05:39) BDK #1395 (1:07:05) BIPs #1620 (1:08:55) BOLTs #869 (1:11:57)

Mark “Murch” Erhardt and Mike Schmidt are joined by Jameson Lopp and Valentine Wallace to discuss ⁠Newsletter #308⁠. News Disclosure of vulnerability affecting old versions of LND (0:54) Continued discussion of PSBTs for silent payments (7:32) Changes to services and client software Casa adds descriptor support (10:55) Specter-DIY v1.9.0 released (40:52) Constant-time analysis tool cargo-checkct announced (41:26) Jade adds miniscript support (43:15) Ark implementation announced (45:32) Volt Wallet beta announced (46:42) Joinstr adds electrum support (47:20) Bitkit v1.0.1 released (47:50) Civkit alpha announced (48:20) Releases and release candidates Bitcoin Core 26.2rc1 (49:01) Notable code and documentation changes Bitcoin Core #29325 (50:11) Eclair #2867 (52:04) LND #8730 (52:33) LDK #3098 (28:14) LDK #3078 (32:35) LDK #3082 (33:53) LDK #3103 (35:18) LDK #3037 (38:07)

Mark “Murch” Erhardt and Mike Schmidt are joined by Hunter Beast and TheCharlatan to discuss Newsletter #307.

Mark “Murch” Erhardt and Dave Harding are joined by Fabian Jahr, Anthony Towns, and Matt Corallo to discuss Newsletter #306. News Upcoming disclosure of vulnerabilities affecting old versions of Bitcoin Core (1:02) BIP and experimental implementation of testnet4 (10:17) Functional encryption covenants (24:58) Updates to proposed soft fork for 64-bit arithmetic (31:27) `OP_CAT` script to validate proof of work (33:32) Proposed update to BIP21 (42:12) Releases and release candidates Core Lightning 24.05rc2 (54:53) Bitcoin Core 27.1rc1 (55:51) Notable code and documentation changes Core Lightning #7252 (56:50) LDK #2931 (1:02:19) Rust Bitcoin #2644 (1:04:11) BIPs #1541 (1:05:19) BIPs #1556 (1:07:34) BLIPs #32 (1:09:28)

Mark “Murch” Erhardt and Dave Harding are joined by Setor Blagogee, Oghenovo Usiwoma, Pierre Rochard, and Alex Bosworth to discuss Newsletter #305. News Light client protocol for silent payments (1:52) Raw taproot descriptors (14:56) Should overlapping soft fork proposals be considered mutually exclusive? (28:02) Selected Q&A from Bitcoin Stack Exchange What's the smallest possible coinbase transaction / block size? (1:13:32) Understanding Script's number encoding, CScriptNum (1:14:18) Is there a way to make a BTC wallet address public but hide how many BTC it contains? (1:16:04) Testing increased feerates in regtest (1:18:05) Why is my P2P_V2 peer connected over a v1 connection? (1:20:41) Does a P2PKH transaction send to the hash of the uncompressed key or the compressed key? (1:21:58) What are different ways to broadcast a block to the Bitcoin network? (1:23:20) Releases and release candidates LND v0.18.0-beta (43:23) Core Lightning 24.05rc2 (1:12:21) Notable code and documentation changes Bitcoin Core #29612 (1:27:11) Bitcoin Core #27064 (1:29:59) Bitcoin Core #29873 (1:30:55) Bitcoin Core #30062 (1:34:15) Bitcoin Core #26606 (1:38:17) BOLTs #1092 (1:41:41)

Mark “Murch” Erhardt and Mike Schmidt are joined by Andrew Toth, Antoine Poinsot, and Tony Klausing to discuss ⁠Newsletter #304⁠. News Upgrading existing LN channels (1:27) Challenges in rewarding pool miners (6:58) Spending previously received SP outputs (12:40) Proposed miniscript BIP (21:32) Channel value pegging (31:42) Changes to services and client software Silent payment resources (43:50) Cake Wallet adds silent payments (46:14) Coordinator-less coinjoin PoC (46:26) OCEAN adds BOLT12 support (47:10) Coinbase adds Lightning support (48:57) Bitcoin escrow tooling announced (49:20) Block's call for mining community feedback (49:48) Sentrum wallet tracker released (50:34) Stack Wallet adds FROST support (51:19) Transaction broadcast tool announced (53:41) Releases and release candidates Bitcoin Inquisition 27.0 (56:30) LND v0.18.0-beta.rc2 (1:00:10) Notable code and documentation changes Bitcoin Core #27101 (1:00:30) Bitcoin Core #30000 (1:01:27) Bitcoin Core #28233 (1:02:42) Core Lightning #7304 (1:09:41) Core Lightning #7063 (1:10:18) Rust Bitcoin #2740 (1:17:54)

Mark “Murch” Erhardt and Mike Schmidt are joined by Adam Gibson to discuss ⁠Newsletter #303⁠. News Anonymous usage tokens (1:58) BIP39 seed phrase splitting (31:48) Alternative to BitVM (38:05) Continued discussion about updating BIP2 (40:41) Releases and release candidates LND v0.18.0-beta.rc2 (44:25) Notable code and documentation changes Core Lightning #7190 (44:51) LDK #2973 (46:18) LDK #2907 (48:21) BDK #1403 (48:59) BIPs #1458 (50:57)

Mark “Murch” Erhardt and Dave Harding are joined by Calvin Kim to discuss ⁠Newsletter #302⁠. News Release of utreexod beta (0:56) BIP119 extensions for smaller hashes and arbitrary data commitments (20:15) Releases and release candidates LDK v0.0.123 (25:16) LND v0.18.0-beta.rc2 (26:08) Notable code and documentation changes Bitcoin Core #29845 (28:16) Core Lightning #7111 (29:34) Libsecp256k1 #1518 (32:04) Rust Bitcoin #2707 (34:30) BIPs #1389 (37:29) BIPs #1567 (42:21) BIPs #1525 (44:08)

Mark “Murch” Erhardt and Mike Schmidt are joined by Ethan Heilman and Gloria Zhao to discuss ⁠Newsletter #301⁠. News Consensus-enforced lamport signatures on top of ECDSA signatures (1:00) Bitcoin Core PR Review Club Index TxOrphanage by wtxid, allow entries with same txid (31:04) Releases and release candidates Libsecp256k1 v0.5.0 (51:15) LND v0.18.0-beta.rc1 (52:12) Notable code and documentation changes Bitcoin Core #28970 (26:33) Bitcoin Core #28016 (53:05) Bitcoin Core #29623 (57:00)

Mark “Murch” Erhardt and Mike Schmidt are joined by Tadge Dryja to discuss ⁠Newsletter #300⁠. News CTV-like exploding keys proposal (0:59) Analyzing a contract protocol with Alloy (13:07) Arrests of Bitcoin developers (22:37) CoreDev.tech Berlin event (28:53) Releases and release candidates Bitcoin Inquisition 25.2 (31:35) LND v0.18.0-beta.rc1 (35:59) Notable code and documentation changes Bitcoin Core #27679 (36:48) Core Lightning #7240 (39:39) Eclair #2851 (44:02) LND #8147 (45:49) LND #8627 (47:37) Libsecp256k1 #1058 (1:00:01) BIPs #1382 (1:02:01) BIPs #1068 (1:03:35)

Mark “Murch” Erhardt and Mike Schmidt are joined by Gregory Sanders to discuss ⁠Newsletter #299⁠. News Weak blocks proof-of-concept implementation (0:56) BIP editors update (20:08) Selected Q&A from Bitcoin Stack Exchange Where exactly is the off-by-one difficulty bug? (26:44) How is P2TR different than P2PKH using opcodes from a developer perspective? (32:10) Are replacement transactions larger in size than their predecessors and than non-RBF transactions? (34:15) Are Bitcoin signatures still vulnerable to nonce reuse? (36:59) How do miners manually add transactions to a block template? (39:48) Releases and release candidates LND v0.17.5-beta (41:40) Notable code and documentation changes Bitcoin Core #29850 (46:35)

Mark “Murch” Erhardt and Mike Schmidt discuss ⁠Newsletter #298⁠. News What would have happened if cluster mempool had been deployed a year ago? (0:42) Changes to services and client software Phoenix for server announced (19:26) Mercury Layer adds Lightning swaps (21:32) Stratum V2 Reference Implementation v1.0.0 released (22:46) Teleport Transactions update (25:09) Bitcoin Keeper v1.2.1 released (28:10) BIP-329 label management software (29:02) Key agent Sigbash launches (31:37) Releases and release candidates Bitcoin Core 27.0 (35:19) BTCPay Server 1.13.1 (41:50) LDK 0.0.122 (42:55) Notable code and documentation changes LDK #2704 (44:40)

Dave Harding and Mike Schmidt are joined by Kulpreet Singh, Chris Stewart, Jameson Lopp, and Joost Jager to discuss ⁠Newsletter #297⁠. News DSL for experimenting with contracts (1:24) Updating BIP2 (15:50) Discussion about resetting and modifying testnet (21:00) Bitcoin Core PR Review Club Implement 64 bit arithmetic op codes in the Script interpreter (37:19) Releases and release candidates HWI 3.0.0 (46:17) Core Lightning 24.02.2 (48:06) Bitcoin Core 27.0rc1 (49:41) Notable code and documentation changes Bitcoin Core #29648 (50:25) Bitcoin Core #29130 (21:00)

Mark “Murch” Erhardt and Mike Schmidt are joined by Antoine Poinsot to discuss ⁠Newsletter #296⁠. News Revisiting consensus cleanup (0:46) Choosing new BIP editors (27:21) Releases and release candidates Bitcoin Core 26.1 (37:22) Bitcoin Core 27.0rc1 (39:09) HWI 3.0.0-rc1 (39:40) Notable code and documentation changes Bitcoin Core #27307 (40:59) Bitcoin Core #29242 (43:50) Core Lightning #7094 (52:59) BDK #1351 (54:41)

Mark “Murch” Erhardt and Mike Schmidt are joined by Dave Harding, Peter Todd, Abubakar Sadiq Ismail, David Gumberg, and Jeffrey Czyz to discuss Newsletter #295. News Disclosure of free relay attack (1:22) Transaction fee sponsorship improvements (9:55) Mempool-based feerate estimation (34:49) Selected Q&A from Bitcoin Stack Exchange What are the risks of running a pre-SegWit node (0.12.1)? (50:30) When is OP_RETURN cheaper than OP_FALSE OP_IF? (55:51) Why does BIP-340 use secp256k1? (56:33) What criteria does Bitcoin Core use to create block templates? (58:08) How does the initialblockdownload field in the getblockchaininfo RPC work? (1:04:45) Releases and release candidates Bitcoin Core 26.1rc2 (1:07:34) Bitcoin Core 27.0rc1 (1:07:55) Notable code and documentation changes Bitcoin Core #28950 (1:17:13) LND #8418 (1:19:07) LDK #2756 (1:23:44) LDK #2935 (1:25:55) LDK #2419 (1:27:39) Rust Bitcoin #2549 (1:32:54) BTCPay Server #5852 (1:33:36)

Mark “Murch” Erhardt and Mike Schmidt are joined by Sebastian Falbesoner, Anthony Towns, and Russell O’Connor to discuss ⁠Newsletter #294⁠. News BIP324 proxy for light clients (1:20) Overview of BTC Lisp (10:44) Changes to services and client software BitGo adds RBF support (38:59) Phoenix Wallet v2.2.0 released (40:11) Bitkey hardware signing device released (44:19) Envoy v1.6.0 released (47:49) VLS v0.11.0 released (49:22) Portal hardware signing device announced (50:54) Braiins mining pool adds Lightning support (51:44) Ledger Bitcoin App 2.2.0 released (54:14) Releases and release candidates Bitcoin Core 26.1rc2 (55:51) Bitcoin Core 27.0rc1 (56:48) Notable code and documentation changes Bitcoin Core #27375 (57:43) Bitcoin Core #27114 (58:59) Bitcoin Core #29306 (1:02:19) LND #8310 (1:09:04) Rust Bitcoin #2458 (1:10:12)

Mark “Murch” Erhardt and Mike Schmidt are joined by ZmnSCPxj, Anthony Towns, and Armin Sabouri to discuss Newsletter #293. News Trustless onchain betting on potential soft forks (1:11) Overview of Chia Lisp for Bitcoiners (14:06) Bitcoin Core PR Review Club Re enable `OP_CAT` (35:48) Releases and release candidates Core Lightning v24.02.1 (50:33) Bitcoin Core 26.1rc1 (51:03) Bitcoin Core 27.0rc1 (52:11) Notable code and documentation changes LND #8136 (54:58) LND #8499 (57:26) LDK #2916 (58:31)