Bitcoin Optech newsletter #426# is here: - links to a draft BIP for letting peers choose their own one-byte message type IDs over the version 2 P2P transport - summarizes a discussion about whether BIPs should include their number in tagged hash tags - describes a proposed metaprotocol for private onchain transfers that requires no consensus changes - Optech Newsletter #426# Podcast

Matt Morehouse joined Optech to discuss Newsletter #425#: News ● Disclosure of two DoS vulnerabilities in Eclair (1:01) ● Proposal for wallet label synchronization (15:25) Changing consensus ● Continued discussion of PQC output types (21:36) ● Block-wide signature aggregation via SNARKs (27:17) ● Bounds on chain length with BIP54 time warp fixes (35:19) ● Comparing covenant proposals for vaults (39:23) ● Depots for probabilistic Lightning channels (43:18) Releases and release candidates ● LND v0.21.4-beta.rc1 (48:40) ● LND v0.20.5-beta.rc1 (50:29) Notable code and documentation changes ● Bitcoin Core #29278# (51:55) ● Bitcoin Core #35984# (53:43) ● Bitcoin Core #35301# (56:45) ● Bitcoin Core #36312# (58:51) ● Bitcoin Core #36284# (1:01:59) ● Bitcoin Core #35752# (1:07:47) ● Bitcoin Core #35813# (1:11:46) ● BIPs #2276# (1:13:07) ● LDK #4993# (1:16:39) ● LND #11173# (1:19:40) ● LND #11190# (1:22:12) ● LND #11212# (1:27:37) ● LND #11258# (1:29:58)

Bitcoin Optech newsletter #425# is here: - summarizes the responsible disclosure of two denial-of-service vulnerabilities affecting older versions of Eclair - describes a proposal for synchronizing wallet labels between devices through an untrusted store - recaps continued discussion of PQC output types - describes an approach to block-wide signature aggregation via SNARKs - summarizes bounds on chain length with BIP54 time warp fixes - links to research comparing covenant proposals for vaults - discusses the depots idea for probabilistic Lightning channels - Optech Newsletter #425# Podcast

Ahmet Kurt (@startimeahmet) and Jan B (@_jan__b) joined Optech to discuss Newsletter #424#: News ● Proposal for a post-quantum Lightning Network (1:10) Selected Q&A from Bitcoin Stack Exchange ● What would be a drawback if sum instead of SHA256 of amounts was used in the taproot signature message? (36:18) ● Post-BIP110 fork is it necessary to resync from block 0? (39:32) ● Can a Bitcoin node build a partial UTXO set from only the most recent blocks and use it to validate new transactions? (42:16) Releases and release candidates ● Bitcoin Core 32.0rc2 (21:13) ● Core Lightning 26.06.8 (45:36) ● LDK v0.3-rc2 (47:15) Notable code and documentation changes ● Bitcoin Core #34566# (51:31) ● BIPs #1951# (54:14) ● BIPs #2224# (57:45) ● Core Lightning #9507# (1:02:00) ● Core Lightning #9508# (1:07:35) ● Core Lightning #9509# (1:12:02) ● Core Lightning #9510# (1:16:03) ● Core Lightning #9513# (1:20:01) ● LND #11198# (1:21:47) ● LND #11146# (1:24:15) ● LND #11132# (1:27:20)

Bitcoin Optech newsletter #424# is here: - describes a proposal for upgrading the offchain protocols of the Lightning Network to post-quantum security - summarizes popular Q&A from Stack Exchange - Optech Newsletter #424# Podcast

Davidson Souza (@Erik17192799), Eric Price, and PortlandHODL (@PortlandHODL) joined Optech to discuss Newsletter #423#: News ● Vardiff controllers that strand slowing miners (23:06) ● Improvements in Utreexo initial block download (1:18) ● New BIP draft for unspendable internal keys (1:17:51) Changes to services and client software ● BitBoxApp adds Spark-based Lightning payments (1:24:09) ● script editor (1:28:40) ● EntropyLab offline key calculator (59:46) Releases and release candidates ● Eclair 0.14.3 (1:31:10) Notable code and documentation changes ● Bitcoin Core #35445# (1:33:34) ● Bitcoin Core #36076# (1:38:51) ● Bitcoin Core #36150# (1:42:18) ● Bitcoin Core #36174# (1:44:37) ● Bitcoin Core #34743# (1:46:13) ● Bitcoin Core #36081# (1:48:07) ● Bitcoin Core #35975# (1:48:59) ● BIPs #2241# (1:50:04) ● BIPs #2258# (1:53:09) ● Eclair #3380# (1:56:33) ● Eclair #3376# (1:57:37) ● Eclair #3372# (2:04:34) ● LND #11163# (2:05:57) ● BDK #2246# (2:07:44)

Bitcoin Optech newsletter #423# is here: - summarizes an analysis of mining pool difficulty controllers stranding slowed miners - describes a proposed improvement to Utreexo’s initial block download - links to a draft BIP for specifying unspendable taproot internal keys - summarizes changes to services/client software - Optech Newsletter #423# Podcast

Adam Gibson and Rob Segers joined Optech to discuss Newsletter #422#: News ● A protocol for probabilistic coinjoin and covert betting (1:14) ● Update on silent payments light clients (43:26) Releases and release candidates ● LDK v0.3-rc1 (1:04:06) ● LDK v0.2.6 (1:05:58) ● BTCPay Server 2.4.4 (1:07:44) Notable code and documentation changes ● Bitcoin Core #35949# (1:13:04) ● Bitcoin Core #34931# (1:15:11) ● Bitcoin Core #36048# (1:18:14) ● Bitcoin Core #36123# (1:21:12) ● Bitcoin Core #36176# (1:22:32) ● Core Lightning #9434# (1:24:49) ● LND #11061# (1:26:29) ● LND #11125# (1:27:23) ● LND #11064# (1:28:33) ● BTCPay Server #7561# (1:29:31) ● BTCPay Server #7559# (1:31:03)

Bitcoin Optech newsletter #422# is here: - describes a proposed protocol for probabilistic coinjoins disguised as covert bets - summarizes benchmarks of a silent payments indexing server against compact block filters for light clients - Optech Newsletter #422# Podcast

Average_gary (@avg_gary), Erick Cestari (@iamflops), Conduition (@conduition_io), and Greg Sanders (@theinstagibbs) joined Optech to discuss Newsletter #421#: News ● Using silent payments for miner payouts in coinbase transaction (2:19) ● Responsible disclosure of a denial-of-service vulnerability in CLN (27:42) Changing consensus ● Continued discussion of PQC output types (54:03) ● DropKick commit/reveal PQC rescue (1:14:08) ● SHRINCS draft BIP (1:35:48) ● BIP448 and CSFS/CTV demos and applications (37:55) Releases and release candidates ● Core Lightning 26.06.7 (1:51:35) ● LND v0.21.3-beta (1:55:32) ● LND v0.20.4-beta (1:55:37) Notable code and documentation changes ● Bitcoin Core #36111# (1:58:21) ● Bitcoin Core #36032# (2:01:17) ● Core Lightning #9435# (2:04:52) ● Eclair #3368# (2:08:10) ● Eclair #3366# (2:10:54) ● LND #11090# (2:14:55) ● LND #11140# (2:20:33) ● HWI #792# (2:23:55) ● BDK #2262# (2:25:48)

Conduition (@conduition_io), Ram (@pseudoramdom), and Fabian Jahr (@fjahr) joined Optech to discuss Newsletter #417#: News ● Draft BIP for stale tip relay (29:26) Changing consensus ● CISA for taproot keypath spends (BIP460) (40:38) ● Segwit commitment to post-quantum witness data (57:51) ● PQC output type discussion (1:45) ● Input-triggered transaction expiry (1:03:36) ● Layered quantum recovery of hashed addresses (21:53) ● Segregated Data (SegData) BIP draft (1:08:33) Releases and release candidates ● Libsecp256k1 0.8.0 (1:15:24) Notable code and documentation changes ● Bitcoin Core #35501# (1:18:10) ● Core Lightning #9298# (1:22:47) ● Core Lightning #9353# (1:25:02) ● Eclair #3336# (1:26:15) ● LND #10942# (1:27:53) ● LND #10992# (1:29:35) ● Rust Bitcoin #6364# (1:31:55) ● Rust Bitcoin #6642# (1:33:22) ● BTCPay Server #7491# (1:36:52) ● BTCPay Server #7488# (1:38:35)

Armin Sabouri, Pyth (@pythcoiner), Conduition (@conduition_io) , and Jonas Nick (@n1ckler) joined Optech to discuss Newsletter #399#: News ● Wallet fingerprinting risks for payjoin privacy (44:15) ● Draft BIP for a wallet backup metadata format (1:04:26) Changing consensus ● Compact Isogeny PQC can replace HD wallets, key-tweaking, silent payments (24:23) ● Varops budget and tapscript leaf 0xc2 (aka Script Restoration) are BIPs 440 and 441 (1:13:24) ● SHRIMPS: 2.5 KB post-quantum signatures across multiple stateful devices (02:02) Releases and release candidates ● Bitcoin Core 31.0rc2 (1:22:07) ● Core Lightning 26.04rc2 (1:23:32) ● BTCPay Server 2.3.7 (1:24:04) Notable code and documentation changes ● Bitcoin Core #32297# (1:26:29) ● Bitcoin Core #34379# (1:28:54) ● Eclair #3269# (1:30:37) ● LDK #4486# (1:32:59) ● LDK #4428# (1:35:00) ● LND #9982# (1:37:13) ● LND #10063# (1:39:00)