Bitcoin Optech Podcast

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 ST...

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 g...

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 c...

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) ● Co...

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 ● Bitco...

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 (2...

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 remov...

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 relea...

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...

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:...

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...

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) ●...

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 vers...

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...

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 Co...

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 document...

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:...

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 a...

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 Relay...

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)...

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...

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...

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 nod...

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 docu...