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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

01:43:44

Bitcoin Optech: Newsletter #366 Recap

Bitcoin Optech Podcast ·

2025/08/13

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

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01:56:16

Bitcoin Optech: Newsletter #365 Recap

Bitcoin Optech Podcast ·

2025/08/06

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

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01:25:07

Bitcoin Optech: Newsletter #364 Recap

Bitcoin Optech Podcast ·

2025/07/31

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

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00:57:37

Bitcoin Optech: Newsletter #363 Recap

Bitcoin Optech Podcast ·

2025/07/22

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

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00:56:26

Bitcoin Optech: Newsletter #362 Recap

Bitcoin Optech Podcast ·

2025/07/16

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)

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02:19:37

Bitcoin Optech: Newsletter #361 Recap

Bitcoin Optech Podcast ·

2025/07/10

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

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01:08:07

Bitcoin Optech: Newsletter #360 Recap

Bitcoin Optech Podcast ·

2025/07/01

Mark “Murch” Erhardt and Mike Schmidt are joined by Daniela Brozzoni and Naiyoma to discuss ⁠Newsletter #360⁠.News● Fingerprinting nodes using `addr` messages (1:00) ● Does any software use `H` in descriptors? (29:36) Selected Q&A from Bitcoin Stack Exchange● Is there any way to block Bitcoin Knots nodes as my peers? (33:42) ● What does OP_CAT do with integers? (42:00) ● Async Block Relaying With Compact Block Relay (BIP152) (43:03) ● Why is attacker revenue in selfish mining disproportional to

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01:18:04

Bitcoin Optech: Newsletter #359 Recap

Bitcoin Optech Podcast ·

2025/06/24

Mark “Murch” Erhardt and Mike Schmidt are joined by Bryan Bishop, Robin Linus, and Rene Pickhardt to discuss ⁠Newsletter #359⁠.News● Proposal to restrict access to Bitcoin Core Project discussion (1:11) ● Improvements to BitVM-style contracts (21:17) ● Channel rebalancing research (41:57) Changes to services and client software● Cove v1.0.0 released (1:03:58) ● Liana v11.0 released (1:04:59) ● Stratum v2 STARK proof demo (1:06:48) ● Breez SDK adds BOLT12 and BIP353 (1:08:41) Releases and release

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01:23:13

Bitcoin Optech: Newsletter #358 Recap

Bitcoin Optech Podcast ·

2025/06/17

Mark “Murch” Erhardt and Mike Schmidt are joined by Antoine Poinsot, Peter Todd, Josh Doman, and TheCharlatan to discuss ⁠Newsletter #358⁠.News● Calculating the selfish mining danger threshold (0:52) ● Relay censorship resistance through top mempool set reconciliation (59:26) ● Updating BIP390 to allow duplicate participant keys in `musig()` expressions (55:50) ● Descriptor encryption library (31:35) Bitcoin Core PR Review Club● Separate UTXO set access from validation functions (43:05) Releases and

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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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