Bitcoin Optech newsletter #400 is here: - recaps the "Testing Bitcoin Core 31.0 Release Candidates" PR Review Club meeting - Optech Newsletter #400 Podcast

Bitcoin Optech

Bitcoin Optech Newsletter #400

This week’s newsletter includes our regular sections summarizing a Bitcoin Core PR Review Club meeting and describing notable changes to popular ...

'Testing Bitcoin Core 31.0 Release Candidates' was a review club meeting that did not review a particular PR, but rather was a group testing effort. Before each major Bitcoin Core release, extensive testing by the community is considered essential. For this reason, a volunteer writes a testing guide for a release candidate so that as many people as possible can productively test without having to independently ascertain what’s new or changed in the release, and reinvent the various setup steps to test these features or changes...

Bitcoin Optech

Bitcoin Optech Newsletter #400

This week’s newsletter includes our regular sections summarizing a Bitcoin Core PR Review Club meeting and describing notable changes to popular ...

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.

Matt Corallo, Gregory Sanders, and Sebastian van Staa joined Optech to discuss Newsletter #397: - Changes to services and client software including items about FIBRE, L402, and others - The Bitcoin Core 31.0rc1 testing guide - OP_TEMPLATEHASH and Taproot-native (Re)bindable Transactions - And more You can listen on our website:

Bitcoin Optech

Bitcoin Optech Newsletter #397 Recap Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Matt Corallo, Gregory Sanders, and Sebastian van Staa to discuss Ne...

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Podcast Episode · Bitcoin Optech Podcast · March 24 · 1h 30m

Jon McAlpine, Antoine Poinsot, Mike Casey, and Ethan Heilman joined Optech to discuss Newsletter #395: - A standard for stateless VTXO verification - Draft BIP for expanded nVersion nonce space for miners - Extensions to standard tooling for TEMPLATEHASH-CSFS-IK support - Hourglass V2 update - Algorithm agility for Bitcoin - The limitations of cryptographic agility in Bitcoin - And more You can listen on our website:

Bitcoin Optech

Bitcoin Optech Newsletter #395 Recap Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Jon McAlpine, Antoine Poinsot, Mike Casey, and Ethan Heilman to dis...

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Bitcoin Optech Podcast • Bitcoin Optech: Newsletter #395 Recap • Listen on Fountain

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Jon McAlpine, Antoine Poinsot, Mike Casey, and Ethan Heilman to dis...

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Bitcoin Optech: Newsletter #395 Recap

Podcast Episode · Bitcoin Optech Podcast · March 11 · 2h 8m

Bitcoin Optech newsletter #395 is here: - describes a standard for verifying VTXOs across different Ark implementations - links to a draft BIP for expanding the miner-usable nonce space in the block header’s nVersion field - points to extensions to standard tooling for TEMPLATEHASH-CSFS-IK support - summarizes updates to the Hourglass V2 proposal - examines perspectives on cryptographic algorithm agility for Bitcoin - Optech Newsletter #395 Podcast

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Jgmcalpine posted to Delving Bitcoin about his proposal for V-PACK, a stateless VTXO verification standard, which aims to provide a mechanism to independently verify and visualize VTXOs in the Ark ecosystem...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Matt Corallo posted to the Bitcoin-Dev mailing list a draft BIP to increase the number of bits available in nVersion’s nonce space for miners from 16 to 24...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Antoine Poinsot wrote on the Bitcoin-Dev mailing list about his preliminary work to integrate the taproot-native OP_TEMPLATEHASH soft fork proposal into miniscript and PSBTs...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Mike Casey posted an update to the Bitcoin-Dev mailing list for the Hourglass protocol to mitigate the market impact of quantum attacks against certain lost coins...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Ethan Heilman wrote on the Bitcoin-Dev mailing list regarding the potential need for RFC7696 Cryptographic Algorithm Agility in Bitcoin...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Pieter Wuille wrote to the Bitcoin-Dev mailing list about the limitations of the cryptographic agility...

Bitcoin Optech

Bitcoin Optech Newsletter #395

This week’s newsletter describes a standard for verifying VTXOs across different Ark implementations and links to a draft BIP for expanding the m...

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 17:30 UTC.

Bitcoin Optech newsletter #370 is here: - details the design of Simplicity - links to a draft BIP for adding elliptic curve operations to tapscript - describes the draft BIP for OP_TWEAKADD - Optech Newsletter #370 Podcast

Bitcoin Optech

Bitcoin Optech Newsletter #370

This week’s newsletter includes our regular sections summarizing discussion about changing Bitcoin’s consensus rules, announcing new release an...

Russell O’Connor made three posts so far to Delving Bitcoin about “the philosophy and design of the Simplicity language”...

Bitcoin Optech

Bitcoin Optech Newsletter #370

This week’s newsletter includes our regular sections summarizing discussion about changing Bitcoin’s consensus rules, announcing new release an...

Olaoluwa Osuntokun posted to the Bitcoin-Dev mailing list a link to a draft BIP for adding several opcodes to tapscript that will allow elliptic curve operations to be performed on the script evaluation stack...

Bitcoin Optech

Bitcoin Optech Newsletter #370

This week’s newsletter includes our regular sections summarizing discussion about changing Bitcoin’s consensus rules, announcing new release an...

Jeremy Rubin posted to the Bitcoin-Dev mailing list a link a draft BIP to add OP_TWEAKADD to tapscript...

Bitcoin Optech

Bitcoin Optech Newsletter #370

This week’s newsletter includes our regular sections summarizing discussion about changing Bitcoin’s consensus rules, announcing new release an...

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!

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Bruno Garcia and Liam Eagen joined Optech to discuss Newsletter #369: News 24:56 Update on differential fuzzing of Bitcoin and LN implementations 0:58 Garbled locks for accountable computing contracts Selected Q&A from Bitcoin Stack Exchange 39:45 Is it possible to recover a private key from an aggregate public key under strong assumptions? 41:24 Are all taproot addresses vulnerable to quantum computing? 45:20 Why cant we set the chainstate obfuscation key? 52:09 Is it possible to revoke a spending branch after a block height? 53:45 Configure Bitcoin Core to use onion nodes in addition to IPv4 and IPv6 nodes? Releases and release candidates 54:22 Bitcoin Core 29.1rc2 56:45 Core Lightning v25.09rc4 Notable code and documentation changes 57:37 Bitcoin Core #31802 1:04:46 LDK #3979 1:06:19 LND #10102 1:07:04 Rust Bitcoin #4907 You can listen on our website:

Bitcoin Optech

Bitcoin Optech Newsletter #369 Recap Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Bruno Garcia and Liam Eagen to discuss Newsletter #369.

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Mark “Murch” Erhardt and Mike Schmidt are joined by Bruno Garcia and Liam Eagen to discuss Newsletter #369.News● Update on differential fuzz...

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Podcast Episode · Bitcoin Optech Podcast · September 2, 2025 · 1h 8m

Earlier this week @npub1j5mp...sd5c and @npub1zsu6...k4em discussed Newsletter #353 with Ruben Somsen, Salvatore Ingala, and Stéphan Vuylsteke: - BIP30 consensus failure vulnerability - Avoiding BIP32 path reuse - Bitcoin Core’s multiprocess project - And more… Catch up:

Bitcoin Optech

Bitcoin Optech Newsletter #353 Recap Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Ruben Somsen, Salvatore Ingala, and Stéphan Vuylsteke to discuss Newsletter #353.

Bitcoin Optech newsletter #352 is here: - links to comparisons between different cluster linearization techniques - briefly summarizes discussion about increasing or removing Bitcoin Core’s OP_RETURN size limit - Optech Newsletter #352 Recap

Bitcoin Optech

Bitcoin Optech Newsletter #352

This week’s newsletter links to comparisons between different cluster linearization techniques and briefly summarizes discussion about increasing...

Pieter Wuille posted to Delving Bitcoin about some of the fundamental tradeoffs between three different cluster linearization techniques, following up with benchmarks of implementations of each...

Bitcoin Optech

Bitcoin Optech Newsletter #352

This week’s newsletter links to comparisons between different cluster linearization techniques and briefly summarizes discussion about increasing...

In a thread on Bitcoin-Dev, several developers discussed changing or removing Bitcoin Core’s default limit for OP_RETURN data carrier outputs. A subsequent Bitcoin Core pull request saw additional discussion...

Bitcoin Optech

Bitcoin Optech Newsletter #352

This week’s newsletter links to comparisons between different cluster linearization techniques and briefly summarizes discussion about increasing...

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 16:30 UTC. Join us to discuss or ask questions!

Riverside Studio

Earlier today @npub1j5mp...sd5c and @npub1zsu6...k4em were joined by Matt Morehouse , @npub185h9...wrdp , and @npub1qqqq...lxwk to discuss Newsletter #343: - LND vulnerability - Bitcoin Core’s priorities - Bitcoin Forking Guide - Update on BIP360 pay-to-quantum-resistant-hash (P2QRH) - Private block template marketplace to prevent centralizing MEV - and more! Catch up:

Bitcoin Optech

Bitcoin Optech Newsletter #344 Recap Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Matt Morehouse, Matt Corallo, and Hunter Beast to discuss Newsletter #344.

Earlier today @npub1sylu...6ksu and @npub1zsu6...k4em talked through Newsletter #343: - unsolicited transactions - assumeUTXO - code checkpoints - long reorgs - nlocktime values - and more! Catch up:

Bitcoin Optech

Bitcoin Optech Newsletter #343 Recap Podcast

Dave Harding and Mike Schmidt discuss Newsletter #343.

Bitcoin Optech newsletter #342 is here: - describes an idea for allowing mobile wallets to settle LN channels without extra UTXOs - summarizes continued discussion about adding a quality-of-service flag for LN pathfinding - summarizes changes to services/client software - adds a v3 commitments topic - Optech Newsletter #342 Recap on Riverside

Bitcoin Optech

Bitcoin Optech Newsletter #342

This week’s newsletter describes an idea for allowing mobile wallets to settle LN channels without extra UTXOs and summarizes continued discussio...

Bastien Teinturier posted to Delving Bitcoin about an opt-in variation of v3 commitments for LN channels that would allow mobile wallets to settle channels using the funds within the channel for all cases where theft is possible...

Bitcoin Optech

Bitcoin Optech Newsletter #342

This week’s newsletter describes an idea for allowing mobile wallets to settle LN channels without extra UTXOs and summarizes continued discussio...

Joost Jager posted to Delving Bitcoin to continue discussion about adding a quality of service (QoS) flag to the LN protocol to allow nodes to signal that one of their channels was highly available (HA)—able to forward payments up to a specified amount with 100% reliability...

Bitcoin Optech

Bitcoin Optech Newsletter #342

This week’s newsletter describes an idea for allowing mobile wallets to settle LN channels without extra UTXOs and summarizes continued discussio...

Changes to services and client software: - Ark Wallet SDK released - Zaprite adds BTCPay Server support - Iris Wallet desktop released - Sparrow 2.1.0 released - Scure-btc-signer 1.6.0 released - Py-bitcoinkernel alpha - Rust-bitcoinkernel library - BIP32 cbip32 library - Lightning Loop moves to MuSig2

Bitcoin Optech

Bitcoin Optech Newsletter #342

This week’s newsletter describes an idea for allowing mobile wallets to settle LN channels without extra UTXOs and summarizes continued discussio...

V3 commitments are LN commitment transactions made using version 3 transactions adhering to the policies for TRUC, a P2A outputs, ephemeral dust, and sibling replacement...

Bitcoin Optech

V3 commitments

V3 commitments are LN commitment transactions made using version 3 transactions adhering to the policies for TRUC, a P2A outputs, ephemeral dust, a...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Bastien Teinturier and Joost Jager on Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside Studio

Earlier today Murch and Schmidty discussed Newsletter #336 with Abubakar Sadiq, Gregory Sanders, and Daniel Roberts: - Double coinbase reservation - LN-Symmetry and more... Catch up:

Bitcoin Optech

Bitcoin Optech Newsletter #336 Recap Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Abubakar Sadiq Ismail, Gregory Sanders, and Daniel Roberts to discuss Newsletter #336.

Yesterday @npub1sylu...6ksu and @npub1zsu6...k4em were joined by Yuval Kogman, Jeremy Rubin, and Steve Myers to discuss Newsletter #335: - Attacks on centralized coinjoin - ChillDKG - Changing consensus - BDK 1.0.0 Catch up:

Bitcoin Optech

Bitcoin Optech Newsletter #335 Recap Podcast

Dave Harding and Mike Schmidt are joined by Yuval Kogman, Jeremy Rubin, and Steve Myers to discuss Newsletter #335.

Bitcoin Optech newsletter #329 is here: - summarizes a new offchain payment resolution protocol - links to papers about potential IP-layer tracking and censorship of LN payments - BTCPay Server security fixes - adds an LN-Penalty topic - adds a Timeout trees topic - Optech Newsletter #329 Recap on Twitter Spaces

Bitcoin Optech

Bitcoin Optech Newsletter #329

This week’s newsletter summarizes a new offchain payment resolution protocol and links to papers about potential IP-layer tracking and censorship...

John Law posted to Delving Bitcoin the description of a micropayment protocol that requires both participants to contribute funds to a bond that can be effectively destroyed at any time by either participant...

Bitcoin Optech

Bitcoin Optech Newsletter #329

This week’s newsletter summarizes a new offchain payment resolution protocol and links to papers about potential IP-layer tracking and censorship...

Charmaine Ndolo posted to Delving Bitcoin summaries of two recent papers about reducing the privacy of LN payments and potentially censoring them...

Bitcoin Optech

Bitcoin Optech Newsletter #329

This week’s newsletter summarizes a new offchain payment resolution protocol and links to papers about potential IP-layer tracking and censorship...

BTCPay Server 2.0.3 and 1.13.7 are maintenance releases that include security critical fixes for users of certain plugins and features...

Bitcoin Optech

Bitcoin Optech Newsletter #329

This week’s newsletter summarizes a new offchain payment resolution protocol and links to papers about potential IP-layer tracking and censorship...

LN-Penalty is a state protocol that penalizes a party who publishes a past state by allowing their funds to be seized by their counterparty...

Bitcoin Optech

LN-Penalty

LN-Penalty is a state protocol that penalizes a party who publishes a past state by allowing their funds to be seized by their counterparty. The pr...

Timeout trees are a type of trustless contract protocol that produces a tree of offchain transactions that only remain safe against counterparty theft for a limited period of time (i.e., they time out)...

Bitcoin Optech

Timeout trees

Timeout trees are a type of trustless contract protocol that produces a tree of offchain transactions that only remain safe against counterparty th...

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 15:30 UTC. Join us to discuss or ask questions!

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Bitcoin Optech newsletter #328 is here: - describes a vulnerability affecting old versions of Bitcoin Core - recaps the "Ephemeral Dust" PR Review Meeting - Optech Newsletter #328 Recap on Twitter Spaces

Bitcoin Optech

Bitcoin Optech Newsletter #328

This week’s newsletter describes a vulnerability affecting old versions of Bitcoin Core and includes our regular sections summarizing a Bitcoin C...

Antoine Poinsot announced to the Bitcoin-Dev mailing list the final vulnerability disclosure predating Bitcoin Core’s new disclosure policy...

Bitcoin Optech

Bitcoin Optech Newsletter #328

This week’s newsletter describes a vulnerability affecting old versions of Bitcoin Core and includes our regular sections summarizing a Bitcoin C...

Ephemeral Dust is a PR by instagibbs that makes transactions with ephemeral dust standard, improving the usability of both keyed as well as unkeyed (P2A) anchors...

Bitcoin Optech

Bitcoin Optech Newsletter #328

This week’s newsletter describes a vulnerability affecting old versions of Bitcoin Core and includes our regular sections summarizing a Bitcoin C...

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Tuesday at 15:30 UTC. Join us to discuss or ask questions!

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Bitcoin Optech newsletter #316 is here: - describes a new time warp that’s particularly consequential for the new testnet4 - summarizes proposed mitigations for onion message denial-of-service concerns - seeks feedback on a proposal to allow LN payers to identify themselves - announces a major change to Bitcoin Core’s build system that could affect developers and integrators - adds Inbound forwarding fees, Merkle tree vulnerabilities topics - Optech #316 Recap

Bitcoin Optech

Bitcoin Optech Newsletter #316

This week’s newsletter describes a new time warp that’s particularly consequential for the new testnet4, summarizes discussion about proposed m...

Mark “Murch” Erhardt posted to Delving Bitcoin to describe an attack discovered by developer Zawy for exploiting testnet4’s new difficulty adjustment algorithm...

Bitcoin Optech

Bitcoin Optech Newsletter #316

This week’s newsletter describes a new time warp that’s particularly consequential for the new testnet4, summarizes discussion about proposed m...

Gijs van Dam posted to Delving Bitcoin to discuss a recent paper by researchers Amin Bashiri and Majid Khabbazian about onion messages...

Bitcoin Optech

Bitcoin Optech Newsletter #316

This week’s newsletter describes a new time warp that’s particularly consequential for the new testnet4, summarizes discussion about proposed m...

Bastien Teinturier posted to Delving Bitcoin to propose methods for allowing spenders to optionally include extra data with their payments that would allow receivers to identify those payments as having come from a known contact...

Bitcoin Optech

Bitcoin Optech Newsletter #316

This week’s newsletter describes a new time warp that’s particularly consequential for the new testnet4, summarizes discussion about proposed m...

Cory Fields posted to the Bitcoin-Dev mailing list to announce Bitcoin Core’s impending switch from the GNU autotools build system to the CMake build system...

Bitcoin Optech

Bitcoin Optech Newsletter #316

This week’s newsletter describes a new time warp that’s particularly consequential for the new testnet4, summarizes discussion about proposed m...

Inbound forwarding fees are fees charged by an LN node for accepting a payment for forwarding. The original LN protocol only specifies charging forwarding fees when a node relays the payment to its next hop...

Bitcoin Optech

Inbound forwarding fees

Inbound forwarding fees are fees charged by an LN node for accepting a payment for forwarding. The original LN protocol only specifies charging for...

Merkle tree vulnerabilities are a class of problems in the design of the merkle tree used by the Bitcoin consensus protocol...

Bitcoin Optech

Merkle tree vulnerabilities

Merkle tree vulnerabilities are a class of problems in the design of the merkle tree used by the Bitcoin consensus protocol.

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Bastien Teinturier on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!

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Bitcoin Optech newsletter #307 is here: - announces a draft BIP for a quantum-safe Bitcoin address format - recaps the "Don’t wipe indexes again when continuing a prior reindex" PR Review Meeting - Optech Newsletter #307 Recap on Twitter Spaces

Bitcoin Optech

Bitcoin Optech Newsletter #307

This week’s newsletter announces a draft BIP for a quantum-safe Bitcoin address format and includes our regular sections with the summary of a Bi...

Developer Hunter Beast posted to both Delving Bitcoin and the mailing list a “rough draft” BIP for assigning version 3 segwit addresses to a quantum-resistant signature algorithm...

Bitcoin Optech

Bitcoin Optech Newsletter #307

This week’s newsletter announces a draft BIP for a quantum-safe Bitcoin address format and includes our regular sections with the summary of a Bi...

'Don’t wipe indexes again when continuing a prior reindex' is a PR by TheCharlatan that can improve startup time when a user restarts their node before an ongoing reindex has completed...

Bitcoin Optech

Bitcoin Optech Newsletter #307

This week’s newsletter announces a draft BIP for a quantum-safe Bitcoin address format and includes our regular sections with the summary of a Bi...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Hunter Beast on Twitter Spaces Tuesday at 14:30 UTC. Join us to discuss or ask questions!

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Bitcoin Optech newsletter #296 is here: - summarizes discussion about a new push for a consensus cleanup soft fork - announces a plan to choose additional BIP editors - adds an accidental confiscation topic - adds a duplicate transactions topic - adds a gap limit topic - adds a time warp topic - Optech Newsletter #296 Recap on Twitter Spaces

Bitcoin Optech

Bitcoin Optech Newsletter #296

This week’s newsletter summarizes discussion about a new push for a consensus cleanup soft fork and announces a plan to choose additional BIP edi...

Antoine Poinsot posted to Delving Bitcoin about revisiting Matt Corallo’s consensus cleanup proposal from 2019...

Bitcoin Optech

Bitcoin Optech Newsletter #296

This week’s newsletter summarizes discussion about a new push for a consensus cleanup soft fork and announces a plan to choose additional BIP edi...

Mark “Murch” Erhardt continued the thread about adding new BIP editors by proposing everyone express “their arguments for and against any candidates in this thread until Friday end-of-day (April 5th)...

Bitcoin Optech

Bitcoin Optech Newsletter #296

This week’s newsletter summarizes discussion about a new push for a consensus cleanup soft fork and announces a plan to choose additional BIP edi...

Accidental confiscation can occur if a poorly designed soft fork permanently prevents a user from being able to get a transaction confirmed...

Bitcoin Optech

Accidental confiscation

Accidental confiscation can occur if a poorly designed soft fork permanently prevents a user from being able to get a transaction confirmed.

Duplicate transactions are more than one transaction that are identical and have identical txids. Bitcoin’s consensus rules use txids to uniquely identify transactions, so duplicate transactions can cause unwanted behavior...

Bitcoin Optech

Duplicate transactions

Duplicate transactions are more than one transaction that are identical and have identical txids. Bitcoin’s consensus rules use txids to uniquely...

Gap limits are the limits wallets set for how many addresses they’ll derive from an HD wallet without seeing any transactions related to those addresses...

Bitcoin Optech

Gap limits

Gap limits are the limits wallets set for how many addresses they’ll derive from an HD wallet without seeing any transactions related to those ad...

Time warp is an exploit of Bitcoin’s difficulty adjustment algorithm that allows miners controlling a large amount of hashrate to prevent difficulty from increasing even as the rate of block production increases...

Bitcoin Optech

Time warp

Time warp is an exploit of Bitcoin’s difficulty adjustment algorithm that allows miners controlling a large amount of hashrate to prevent difficu...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Antoine Poinsot on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions!

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