Bitcoin Optech Podcast

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 blockchain size? (39:17)

● I read that OP_TEMPLATEHASH is a variant of OP_CTV. How do they differ? (44:59)

Releases and release candidates

● LND 0.20.0-beta.rc1 (49:59)

● Eclair 0.13.1 (50:43)

Notable code and documentation changes

● Bitcoin Core #29640 (51:21)

● Core Lightning #8400 (54:15)

● Eclair #3173 (54:53)

● LND #10280 (56:56)

● BIPs #2006 (57:27)

● BIPs #1975 (1:00:58)

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

● Bitcoin Core #33157 (43:00)

● Bitcoin Core #29675 (45:56)

● Bitcoin Core #33517 (46:59)

● Eclair #2792 (49:01)

● LDK #4122 (51:01)

● LND #9868 (52:37)

● LND #10273 (53:48)

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)

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 #33504 (51:52)

● Core Lightning #8563 (53:55)

● Core Lightning #8523 (56:55)

● Core Lightning #8398 (58:22)

● LDK #4120 (59:47)

● LND #10254 (1:01:35)

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 (28:11)

● LDK #4098 (30:40)

● LDK #4106 (33:40)

● LDK #4096 (35:43)

● LND #10133 (37:24)

● BDK #2029 (39:08)

● BIPs #1911 (42:15)

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 remove the safeguard instead of keeping it as a default discouragement? (42:12)

● What are the worst-case stress scenarios from uncapped OP_RETURNs in Bitcoin Core v30? (43:25)

● If OP_RETURN needed more room, why was the 80-byte cap removed instead of being raised to 160? (50:39)

● If arbitrary data is inevitable, does removing OP_RETURN limits shift demand toward more harmful storage methods (like UTXO-inflating addresses)? (59:48)

● If OP_RETURN uncapping doesn’t increase the UTXO set, how does it still contribute to blockchain bloat and centralization pressure? (1:00:17)

● How does uncapping OP_RETURN impact long-term fee-market quality and security budget? (1:02:11)

● Assurance blockchain will not suffer from illegal content with 100KB OP_RETURN? (1:04:34)

● What analysis shows OP_RETURN uncapping won’t harm block propagation or orphan risk? (1:05:25)

● Where does Bitcoin Core keep the XOR obfuscation keys for both block data files and level DB indexes? (1:06:10)

● How robust is 1p1c transaction relay in bitcoin core 28.0? (1:06:34)

● How can I allow getblocktemplate to include sub 1 sat/vbyte transactions? (1:10:37)

Releases and release candidates

● Bitcoin Core 30.0rc1 (1:13:00)

Notable code and documentation changes

● Bitcoin Core #33333 (1:15:26)

● Bitcoin Core #28592 (1:18:36)

● Eclair #3171 (1:22:33)

● Eclair #3175 (1:26:41)

● LDK #4064 (1:29:36)

● LDK #4067 (1:31:04)

● LDK #4046 (1:32:43)

● LDK #4083 (1:35:27)

● LND #10189 (1:38:23)

● BIPs #1963 (1:41:17)

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 release candidates

● Bitcoin Core 30.0rc1 (39:14)

● BDK Chain 0.23.2 (1:16:28)

Notable code and documentation changes

● Bitcoin Core #33268 (1:17:19)

● Eclair #3157 (1:18:56)

● LND #9975 (1:19:52)

● LND #9677 (1:20:21)

● LDK #4045 (1:20:41)

● LDK #4049 (1:20:32)

● BDK #1582 (1:22:18)

● BDK #2000 (1:23:13)

● BDK #2028 (1:24:17)

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 #3021 (45:18)

● Eclair #3142 (48:08)

● LDK #4053 (50:30)

● LDK #3886 (58:12)

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 (1:00:24)

Notable code and documentation changes

● LDK #3726 (1:00:55)

● LDK #4019 (1:02:24)

● LND #9455 (1:03:09)

● LND #10103 (1:04:00)

● HWI #795 (1:05:20)

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 (38:23)

● LSP plugin for BTCPay Server (39:17)

● Proto mining hardware and software announced (39:42)

● Oracle resolution demo using CSFS (40:46)

● Relai adds taproot support (41:11)

Releases and release candidates

● LND v0.19.3-beta (43:09)

● Bitcoin Core 29.1rc1 (43:29)

● Core Lightning v25.09rc2 (43:55)

Notable code and documentation changes

● Bitcoin Core #32896 (44:33)

● Bitcoin Core #33106 (46:57)

● Core Lightning #8467 (1:02:49)

● Core Lightning #8354 (1:03:26)

● Eclair #3103 (1:04:07)

● Eclair #3134 (1:04:43)

● LDK #3897 (1:05:56)