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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

01:36:52

Bitcoin Optech: Newsletter #357 Recap

Bitcoin Optech Podcast ·

2025/06/12

Mark “Murch” Erhardt and Mike Schmidt are joined by Jose SK, Clara Shikhelman, Vojtěch Strnad, Robin Linus, and Dan Gould to discuss ⁠Newsletter #357⁠.News● Syncing full nodes without witnesses (1:30) Changing consensus● Quantum computing report (17:38) ● Transaction weight limit with exception to prevent confiscation (41:49) ● Removing outputs from the UTXO set based on value and time (53:47) Releases and release candidates● Core Lightning 25.05rc1 (1:07:45) ● LND 0.19.1-beta.rc1 (1:08:02) Notable

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01:12:04

Bitcoin Optech: Newsletter #356 Recap

Bitcoin Optech Podcast ·

2025/06/03

Mark “Murch” Erhardt and Mike Schmidt are joined by Carla Kirk-Cohen, Joost Jager, and Elias Rohrer to discuss Newsletter #356.News● Do attributable failures reduce LN privacy? (0:57) Selected Q&A from Bitcoin Stack Exchange● Which transactions get into blockreconstructionextratxn? (40:40) ● Why would anyone use OP_RETURN over inscriptions, aside from fees? (46:47) ● Why is my Bitcoin node not receiving incoming connections? (48:25) ● How do I configure my node to filter out transactions larger

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01:07:00

Bitcoin Optech: Newsletter #355 Recap

Bitcoin Optech Podcast ·

2025/06/02

Dave Harding is joined by Alex Myers and Rodolfo Novak to discuss Newsletter #355.Changes to services and client software● Cake Wallet added payjoin v2 support (2:38) ● Sparrow adds pay-to-anchor features (6:37) ● Safe Wallet 1.3.0 released (8:00) ● COLDCARD Q v1.3.2 released (9:15) ● Transaction batching using payjoin (19:07) ● JoinMarket Fidelity Bond Simulator (20:46) ● Bitcoin opcodes documented (26:39) ● Bitkey code open sourced (27:59) Releases and release candidates● LND 0.19.0-beta (33:43) ●

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01:23:10

Bitcoin Optech: Newsletter #354 Recap

Bitcoin Optech Podcast ·

2025/05/21

Mark “Murch” Erhardt and Mike Schmidt are joined by Eugene Siegel, Chris Stewart, Bram Cohen, and Robin Linus to discuss Newsletter #353.News● Vulnerability disclosure affecting old versions of Bitcoin Core (1:17) Changing consensus● Proposed BIP for 64-bit arithmetic in Script (5:28) ● Proposed opcodes for enabling recursive covenants through quines (23:11) ● Description of benefits to BitVM from `OP_CTV` and `OP_CSFS` (36:39) Releases and release candidates● LND 0.19.0-beta.rc4 (1:07:28) Notable

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00:57:44

Bitcoin Optech: Newsletter #353 Recap

Bitcoin Optech Podcast ·

2025/05/15

Mark “Murch” Erhardt and Mike Schmidt are joined by Ruben Somsen, Salvatore Ingala, and Stéphan Vuylsteke to discuss Newsletter #353.News● BIP30 consensus failure vulnerability (0:52) ● Avoiding BIP32 path reuse (28:33) Bitcoin Core PR Review Club● Add bitcoin wrapper executable (16:38) Releases and release candidates● LND 0.19.0-beta.rc4 (45:01) Notable code and documentation changes● Core Lightning #8227 (45:18) ● Core Lightning #8162 (46:43) ● Core Lightning #8166 (47:44) ● Core Lightning #8237

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01:13:07

Bitcoin Optech: Newsletter #352 Recap

Bitcoin Optech Podcast ·

2025/05/09

Mark “Murch” Erhardt and Sjors Provoost discuss Newsletter #352.News● Comparison of cluster linearization techniques (0:41) ● Increasing or removing Bitcoin Core's `OP_RETURN` size limit (6:46) Releases and release candidates● LND 0.19.0-beta.rc3 (1:01:16) Notable code and documentation changes● Bitcoin Core #31250 (1:02:10) ● Eclair #3064 (1:06:02) ● BTCPay Server #6684 (1:07:46) ● BIPs #1555 (1:10:34)

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01:11:29

Bitcoin Optech: Newsletter #351 Recap

Bitcoin Optech Podcast ·

2025/04/30

Mark “Murch” Erhardt and Mike Schmidt are joined by Jonas Nick and Salvatore Ingala to discuss Newsletter #351.News● Interactive aggregate signatures compatible with secp256k1 (0:50) ● Standardized backup for wallet descriptors (21:34) Selected Q&A from Bitcoin Stack Exchange● Practicality of half-aggregated schnorr signatures? (17:16) ● What's the largest size OP_RETURN payload ever created? (41:17) ● Non-LN explanation of pay-to-anchor? (43:29) ● Up-to-date statistics about chain

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00:41:52

Bitcoin Optech: Newsletter #350 Recap

Bitcoin Optech Podcast ·

2025/04/22

Mark “Murch” Erhardt and Mike Schmidt are joined by Niklas Gögge to discuss ⁠Newsletter #350⁠.Changes to services and client software● Bitcoin Knots version 28.1.knots20250305 released (11:26) ● PSBTv2 explorer announced (13:51) ● LNbits v1.0.0 released (14:38) ● The Mempool Open Source Project® v3.2.0 released (15:22) ● Coinbase MPC library released (17:25) ● Lightning Network liquidity tool released (21:20) ● Versioned Storage Service announced (22:25) ● Fuzz testing tool for Bitcoin nodes (1:17)

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00:58:57

Bitcoin Optech: Newsletter #349 Recap

Bitcoin Optech Podcast ·

2025/04/22

Mark “Murch” Erhardt and Dave Harding are joined by Sebastian Falbesoner, Ruben Somsen, and Abubakar Sadiq Ismail to discuss ⁠Newsletter #349⁠.News● SwiftSync speedup for initial block download (0:34) Bitcoin Core PR Review Club● Add Fee rate Forecaster Manager (29:33) Releases and release candidates● Core Lightning 25.02.1 (46:54) ● Core Lightning 24.11.2 (47:03) ● BTCPay Server 2.1.0 (48:14) ● Bitcoin Core 29.0rc3 (49:25) ● LND 0.19.0-beta.rc2 (51:21) Notable code and documentation changes● LDK

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02:18:29

Bitcoin Optech: Newsletter #348 Recap

Bitcoin Optech Podcast ·

2025/04/21

Mark “Murch” Erhardt and Mike Schmidt are joined by Jonas Nick, Jameson Lopp, Steven Roose, Gregory Sanders, and Salvatore Ingala to discuss ⁠Newsletter #348⁠.News● Educational and experimental-based secp256k1 implementation (1:09) Changing consensus● Should vulnerable bitcoins be destroyed? (9:17) ● Securely proving UTXO ownership by revealing a SHA256 preimage (34:52) ● Draft BIP for destroying quantum-insecure bitcoins (44:01) ● Criticism of CTV motivation (51:16) ● CTV+CSFS benefits (1:06:02) ●

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01:17:40

Bitcoin Optech: Newsletter #347 Recap

Bitcoin Optech Podcast ·

2025/04/01

Mark “Murch” Erhardt and Mike Schmidt are joined by Sjors Provoost and Antoine Poinsot to discuss ⁠Newsletter #347⁠.News● LN upfront and hold fees using burnable outputs (0:54) ● Discussion of testnets 3 and 4 (5:11) ● Plan to relay certain taproot annexes (19:01) Selected Q&A from Bitcoin Stack Exchange● Why is the witness commitment optional? (24:58) ● Can all consensus valid 64 byte transactions be (third party) malleated to change their size? (36:39) ● How long does it take for a transaction

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01:21:47

Bitcoin Optech: Newsletter #346 Recap

Bitcoin Optech Podcast ·

2025/03/26

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse, Yong Yu, Alejandro De La Torre, Jan B, and Marco De Leon to discuss ⁠Newsletter #346⁠.News● Discussion of LND's dynamic feerate adjustment system (1:24) Changes to services and client software● Wally 1.4.0 released (17:17) ● Bitcoin Core Config Generator announced (18:05) ● A regtest development environment container (18:55) ● Explora transaction visualization tool (20:17) ● Hashpool v0.1 tagged (21:35) ● DMND launching pooled

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00:54:13

Bitcoin Optech: Newsletter #345 Recap

Bitcoin Optech Podcast ·

2025/03/24

Mark “Murch” Erhardt and Mike Schmidt are joined by Sindura Saraswathi, Christian Kümmerle, and Stéphan Vuylsteke to discuss Newsletter #345.News● P2P traffic analysis (1:35) ● Research into single-path LN pathfinding (6:45) ● Probabilistic payments using different hash functions as an xor function (21:17) Bitcoin Core PR Review Club● Stricter internal handling of invalid blocks (26:12) Releases and release candidates● Eclair v0.12.0 (37:49) Notable code and documentation changes● Bitcoin Core

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01:21:44

Bitcoin Optech: Newsletter #344 Recap

Bitcoin Optech Podcast ·

2025/03/11

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse, Matt Corallo, and Hunter Beast to discuss Newsletter #344.News● Disclosure of fixed LND vulnerability allowing theft (0:57) ● Discussion about Bitcoin Core's priorities (10:49) Changing consensus● Bitcoin Forking Guide (1:01:11) ● Update on BIP360 pay-to-quantum-resistant-hash (P2QRH) (34:37) ● Private block template marketplace to prevent centralizing MEV (21:06) Releases and release candidates● Core Lightning 25.02 (1:09:57)

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00:54:20

Bitcoin Optech: Newsletter #343 Recap

Bitcoin Optech Podcast ·

2025/03/04

Dave Harding and Mike Schmidt discuss Newsletter #343.

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00:58:38

Bitcoin Optech: Newsletter #342 Recap

Bitcoin Optech Podcast ·

2025/03/03

Dave Harding and Mike Schmidt are joined by Bastien Teinturier and Joost Jager discuss ⁠Newsletter #342⁠.News● Allowing mobile wallets to settle channels without extra UTXOs (0:59) ● Continued discussion about an LN quality of service flag (13:14) Changes to services and client software● Ark Wallet SDK released (40:28) ● Zaprite adds BTCPay Server support (40:57) ● Iris Wallet desktop released (41:21) ● Sparrow 2.1.0 released (41:41) ● Scure-btc-signer 1.6.0 released (42:38) ● Py-bitcoinkernel alpha

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00:59:32

Bitcoin Optech: Newsletter #341 Recap

Bitcoin Optech Podcast ·

2025/02/18

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #341.News● Continued discussion about probabilistic payments (0:34) ● Continued discussion about ephemeral anchor scripts for LN (7:26) ● Stats on orphan evictions (14:31) ● Updated proposal for updated BIP process (27:08) Bitcoin Core PR Review Club● Cluster mempool: introduce TxGraph (35:43) Releases and release candidates● LND v0.18.5-beta (43:48) ● Bitcoin Inquisition 28.1 (44:10) Notable code and documentation changes● Bitcoin Core #25832

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02:43:04

Bitcoin Optech: Newsletter #340 Recap

Bitcoin Optech Podcast ·

2025/02/14

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse, Johan Halseth, Pieter Wuille, Sergi Delgado, Bastien Teinturier, Oleksandr Kurbatov, Antoine Poinsot and Bob McElrath to discuss Newsletter #340.News● Channel force closure vulnerability in LDK (2:14) ● Zero-knowledge gossip for LN channel announcements (16:01) ● Discovery of previous research for finding optimal cluster linearization (26:29) ● Erlay update (46:38) ● Tradeoffs in LN ephemeral anchor scripts (1:09:50) ● Emulating

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01:15:58

Bitcoin Optech: Newsletter #339 Recap

Bitcoin Optech Podcast ·

2025/02/07

Mark “Murch” Erhardt and Dave Harding are joined by Matt Morehouse and 0xB10C to discuss Newsletter #339.News● Vulnerability in LDK claim processing (0:47)● Replacement cycling attacks with miner exploitation (17:28)● Updated stats on compact block reconstruction (23:56)Selected Q&A from Bitcoin Stack Exchange● Who uses or wants to use PSBTv2 (BIP370)? (32:38)● In the bitcoin's block genesis, which parts can be filled arbitrarily? (34:41)● Lightning force close detection (36:47)● Is a

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00:49:31

Bitcoin Optech: Newsletter #338 Recap

Bitcoin Optech Podcast ·

2025/01/28

Mark “Murch” Erhardt and Mike Schmidt are joined by Andrew Toth and Dave Harding to discuss ⁠Newsletter #338⁠.News - Draft BIP for unspendable keys in descriptors (0:49) - PSBTv2 integration testing (9:55) - Correction about offchain DLCs (15:25) Changes to services and client software - Bull Bitcoin Mobile Wallet adds payjoin (28:10) - Bitcoin Keeper adds miniscript support (28:52) - Nunchuk adds taproot MuSig2 features (29:26) - Jade Plus signing device announced (32:08) - Coinswap

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