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PODCAST

Bitcoin Optech Podcast

Join Bitcoin Optech as we discuss Bitcoin and Lightning technology each week and review our newsletters. https://bitcoinops.org/

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All Episodes

01:03:50

Bitcoin Optech: Newsletter #394 Recap

Bitcoin Optech Podcast ·

2026/03/03

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

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01:31:15

Bitcoin Optech: Newsletter #393 Recap

Bitcoin Optech Podcast ·

2026/02/24

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●

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01:32:29

Bitcoin Optech: Newsletter #392 Recap

Bitcoin Optech Podcast ·

2026/02/24

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

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02:10:04

Bitcoin Optech: Newsletter #391 Recap

Bitcoin Optech Podcast ·

2026/02/11

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) ●

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01:03:02

Bitcoin Optech: Newsletter #390 Recap

Bitcoin Optech Podcast ·

2026/02/04

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

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00:53:51

Bitcoin Optech: Newsletter #389 Recap

Bitcoin Optech Podcast ·

2026/01/27

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) ●

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00:58:51

Bitcoin Optech: Newsletter #388 Recap

Bitcoin Optech Podcast ·

2026/01/20

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)

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01:24:23

Bitcoin Optech: Newsletter #387 Recap

Bitcoin Optech Podcast ·

2026/01/14

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

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02:02:17

Bitcoin Optech: Newsletter #386 Recap

Bitcoin Optech Podcast ·

2026/01/06

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

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03:42:37

Bitcoin Optech: Newsletter #385: 2025 Year-in-Review...

Bitcoin Optech Podcast ·

2025/12/24

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

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01:12:55

Bitcoin Optech: Newsletter #384 Recap

Bitcoin Optech Podcast ·

2025/12/16

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

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01:20:37

Bitcoin Optech: Newsletter #383 Recap

Bitcoin Optech Podcast ·

2025/12/09

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

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01:05:34

Bitcoin Optech: Newsletter #382 Recap

Bitcoin Optech Podcast ·

2025/12/03

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

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01:36:28

Bitcoin Optech: Newsletter #381 Recap

Bitcoin Optech Podcast ·

2025/11/25

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

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00:44:04

Bitcoin Optech: Newsletter #380 Recap

Bitcoin Optech Podcast ·

2025/11/18

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)

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02:07:25

Bitcoin Optech: Newsletter #379 Recap

Bitcoin Optech Podcast ·

2025/11/12

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

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01:02:37

Bitcoin Optech: Newsletter #378 Recap

Bitcoin Optech Podcast ·

2025/11/04

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

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00:55:28

Bitcoin Optech: Newsletter #377 Recap

Bitcoin Optech Podcast ·

2025/10/29

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●

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00:38:54

Bitcoin Optech: Newsletter #376 Recap

Bitcoin Optech Podcast ·

2025/10/28

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)

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01:02:37

Bitcoin Optech: Newsletter #375 Recap

Bitcoin Optech Podcast ·

2025/10/17

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

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