Bitcoin Optech - Hyper

Bitcoin Optech

🛡️ bitcoinops.org

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We provide weekly newsletters, workshops, case studies, and research for the #Bitcoin community.

Bitcoin Optech 2 days ago

Bitcoin Optech newsletter #387 is here: - warns of a wallet migration bug in Bitcoin Core - summarizes a post about using the Ark protocol as an LN channel factory - links to a draft BIP for silent payment descriptors - Optech Newsletter #387 Podcast

Bitcoin Optech Newsletter #387

This week’s newsletter warns of a wallet migration bug in Bitcoin Core, summarizes a post about using the Ark protocol as an LN channel factory, ...

Bitcoin Core posted a notice of a bug in the legacy wallet migration feature in versions 30.0 and 30.1...

Bitcoin Optech Newsletter #387

This week’s newsletter warns of a wallet migration bug in Bitcoin Core, summarizes a post about using the Ark protocol as an LN channel factory, ...

René Pickhardt wrote on Delving Bitcoin about his discussions and ideas around whether Ark’s best use case might be as a flexible channel factory rather than as an end-user payment solution...

Bitcoin Optech Newsletter #387

This week’s newsletter warns of a wallet migration bug in Bitcoin Core, summarizes a post about using the Ark protocol as an LN channel factory, ...

Craig Raw posted to the Bitcoin-Dev mailing list a proposal for a draft BIP, which defines a new top-level descriptor script expression sp() for silent payments...

Bitcoin Optech Newsletter #387

This week’s newsletter warns of a wallet migration bug in Bitcoin Core, summarizes a post about using the Ark protocol as an LN channel factory, ...

Bitcoin Optech will host an audio recap discussion of this newsletter on

Riverside: HD Podcast & Video Software | Free Recording & Editing

Riverside is your online studio for high-quality podcast and video recording and editing. Powered by AI, built for human conversations. Get started...

Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside.FM Studio

Bitcoin Optech 4 days ago

Anthony Towns and Mikhail Kudinov joined Optech to discuss Newsletter #386: - A notice about the wallet migration bug in Bitcoin Core - Building a vault using blinded co-signers - BIP for Peer feature negotiation - Year 2106 timestamp overflow - BIP54 timestamp restriction for a timestamp overflow soft fork - Mitigating a CTV footgun - CTV activation meeting - OP_CHECKCONSOLIDATION to enable cheaper consolidations - Hash-based signatures post-quantum Bitcoin - And more You can listen on our website:

Bitcoin Optech Newsletter #386 Recap Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Anthony Towns and Mikhail Kudinov to discuss Newsletter #386.

Fountain:

Bitcoin Optech Podcast • Bitcoin Optech: Newsletter #386 Recap • Listen on Fountain

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Anthony Towns and Mikhail Kudinov to discuss ⁠Newsletter #386⁠...

Spotify:

Bitcoin Optech: Newsletter #386 Recap

Bitcoin Optech Podcast · Episode

Apple Podcasts:

Bitcoin Optech: Newsletter #386 Recap

Podcast Episode · Bitcoin Optech Podcast · 01/06/2026 · 2h 2m

Bitcoin Optech 1 week ago

Bitcoin Optech newsletter #386 is here: - summarizes a vault-like scheme using blinded MuSig2 - describes a proposal for Bitcoin clients to announce and negotiate support for new P2P features - links to 2106 timestamp overflow discussion and considerations around BIP54 - notes a CTV activation meeting and CTV footgun discussion - summarizes the OP_CHECKCONSOLIDATION proposal - links to a report of hash-based post-quantum signature schemes - Optech Newsletter #386 Podcast

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Jonathan T. Halseth posted to Delving Bitcoin a prototype of a vault-like scheme using blinded co-signers. Unlike traditional setups using co-signers, this scheme uses a blinded version of MuSig2 to ensure the signers know as little as possible about the funds they are involved in signing...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Anthony Towns posted to the Bitcoin-Dev mailing list about a proposal for a new BIP to define a P2P message that would allow peers to announce and negotiate support for new features...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Asher Haim posted to the Bitcoin-Dev mailing list asking Bitcoin developers to act promptly to prepare for a migration from uint32 to uint64 block timestamps...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Josh Doman posted to the Bitcoin-Dev mailing list and Delving Bitcoin asking whether it’s might be worthwhile to modify the consensus cleanup proposal to be more permissive to odd block timestamp behavior to allow a potential soft fork solution to the 2106 block timestamp overflow issue...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Chris Stewart posted to Delving Bitcoin a discussion of a “footgun” with OP_CHECKTEMPLATEVERIFY (CTV)...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Developer 1440000bytes hosted a CTV (BIP119) activation meeting...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

billymcbip proposed an opcode specifically optimized for consolidations. OP_CHECKCONSOLIDATION (CC) would evaluate to 1 if and only if it’s executed on an input with the same scriptPubKey as an earlier input in the same transaction...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Mikhail Kudinov and Jonas Nick posted to the Bitcoin-Dev mailing list about their work on evaluating hash-based signatures for use in Bitcoin...

Bitcoin Optech Newsletter #386

This week’s newsletter summarizes a vault-like scheme using blinded MuSig2 and describes a proposal for Bitcoin clients to announce and negotiate...

Bitcoin Optech will host an audio recap discussion of this newsletter on

Riverside: HD Podcast & Video Software | Free Recording & Editing

Riverside is your online studio for high-quality podcast and video recording and editing. Powered by AI, built for human conversations. Get started...

Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside.FM Studio

Bitcoin Optech 2 weeks ago

Bastien Teinturier, Rearden Code, and Pieter Wuille joined Optech to discuss Newsletter #385: 2025 Year-in-Review Special. Catch up on Bitcoin developments in 2025. You can listen on our website:

Bitcoin Optech Newsletter #385 Recap Podcast

Mark “Murch” Erhardt and Mike Schmidt are joined by Bastien Teinturier, Rearden Code, and Pieter Wuille to discuss Newsletter #385: 2025 Year-i...

Spotify:

Bitcoin Optech: Newsletter #385: 2025 Year-in-Review Special Recap

Bitcoin Optech Podcast · Episode

Apple Podcasts:

Bitcoin Optech: Newsletter #385: 2025 Year-in-Review Special Recap

Podcast Episode · Bitcoin Optech Podcast · 12/24/2025 · 3h 43m

Bitcoin Optech 3 weeks ago

Bitcoin Optech newsletter #385: 2025 Year-in-Review Special is here: - notes Bitcoin developments during each month of 2025 - feature: Vulnerability disclosures - feature: Quantum - feature: Soft fork proposals - feature: Stratum v2 - feature: Major releases of popular infrastructure projects - feature: Optech

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

In 2025, Optech summarized more than a dozen vulnerability disclosures...

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

With the increased attention on the potential for a future quantum computer to weaken or break the Elliptic Curve Discrete Logarithm (ECDL) hardness assumption that Bitcoin relies on to prove the ownership of coins, several conversations and proposals were put forward throughout the year to discuss and mitigate the impact of such a development.

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

This year saw a bevy of discussions around soft fork proposals, ranging from the tightly scoped and minimally impactful, to the broadly scoped and powerful…

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

Stratum v2 is a mining protocol designed to replace the original Stratum protocol used between miners and mining pools. Throughout 2025, Bitcoin Core received several updates to better support Stratum v2 implementations....

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

Optech covered major releases of popular infrastructure projects throughout the year...

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

In Optech’s eighth year, we published: - 50 newsletters - over 80,000 words, a 225pg book equivalent - over 60hrs of podcasts, with 500,000 words of transcripts w/75 guests - 150+ non-English translations

Bitcoin Optech Newsletter #385: 2025 Year-in-Review Special

The eighth annual Bitcoin Optech Year-in-Review special summarizes notable developments in Bitcoin during all of 2025.

A special thank you After contributing as the primary author for 376 consecutive Bitcoin Optech newsletters, Dave Harding stepped back from contributing regularly this year. We cannot thank Harding enough for anchoring the newsletter for eight years and all of the Bitcoin education, elucidation, and understanding he brought the community. We are eternally grateful and wish him all the best. Bitcoin Optech will host an audio recap discussion of this special newsletter on Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside.FM Studio

Bitcoin Optech 3 weeks ago

Matt Morehouse and Salvatore Ingala joined Optech to discuss Newsletter #384: - Vulnerabilities fixed in LND 0.19.0 - A virtualized secure enclave for hardware signing devices - 7 updates to services and client software - 3 questions from the Bitcoin Stack Exchange - And More You can listen on our website:

Bitcoin Optech Newsletter #384 Recap Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Matt Morehouse and Salvatore Ingala to discuss Newsletter #384.

Fountain:

Bitcoin Optech Podcast • Bitcoin Optech: Newsletter #384 Recap • Listen on Fountain

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Matt Morehouse and Salvatore Ingala to discuss ⁠Newsletter #384�...

Spotify:

Bitcoin Optech: Newsletter #384 Recap

Bitcoin Optech Podcast · Episode

Apple Podcasts:

Bitcoin Optech: Newsletter #384 Recap

Podcast Episode · Bitcoin Optech Podcast · 12/16/2025 · 1h 13m

Bitcoin Optech 4 weeks ago

Bitcoin Optech newsletter #384 is here: - discloses vulnerabilities in LND - describes a project for running a virtual machine in an embedded secure element - summarizes changes to services/client software - summarizes popular Q&A from Stack Exchange - Optech Newsletter #384 Podcast

Bitcoin Optech Newsletter #384

This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also...

Matt Morehouse posted to Delving Bitcoin about critical vulnerabilities fixed in LND 0.19.0...

Bitcoin Optech Newsletter #384

This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also...

Salvatoshi posted to Delving Bitcoin about Vanadium, a virtualized secure enclave for hardware signing devices...

Bitcoin Optech Newsletter #384

This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also...

Changes to services and client software: - Interactive transaction visualization tool - BlueWallet v7.2.2 released - Stratum v2 updates - Auradine announces Stratum v2 support - LDK Node 0.7.0 released - BIP-329 Python Library 1.0.0 release - Bitcoin Safe 1.6.0 released

Bitcoin Optech Newsletter #384

This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also...

Selected Q&A from Bitcoin Stack Exchange: - Does a clearnet connection to my Lightning node require a TLS certificate? - Why do different implementations produce different DER signatures for the same private key and hash? - Why is the miniscript after value limited at 0x80000000?

Bitcoin Optech Newsletter #384

This week’s newsletter discloses vulnerabilities in LND and describes a project for running a virtual machine in an embedded secure element. Also...

Bitcoin Optech will host an audio recap discussion of this newsletter on

Riverside: HD Podcast & Video Software | Free Recording & Editing

Riverside is your online studio for high-quality podcast and video recording and editing. Powered by AI, built for human conversations. Get started...

Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside.FM Studio

Bitcoin Optech 4 weeks ago

Moonsettler and Julian joined Optech to discuss Newsletter #383: - A consensus bug in the NBitcoin library found with differential fuzzing - LNHANCE soft fork proposal updates - Benchmarking Bitcoin Script under the proposed varops budget - Optimizations to SLH-DSA (SPHINCS) post-quantum signatures - And More You can listen on our website:

Bitcoin Optech Newsletter #383 Recap Podcast

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Moonsettler and Julian to discuss Newsletter #383.

Fountain:

Bitcoin Optech Podcast • Bitcoin Optech: Newsletter #383 Recap • Listen on Fountain

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt are joined by Moonsettler and Julian to discuss Newsletter #383.News● Consensu...

Spotify:

Bitcoin Optech: Newsletter #383 Recap

Bitcoin Optech Podcast · Episode

Apple Podcasts:

Bitcoin Optech: Newsletter #383 Recap

Podcast Episode · Bitcoin Optech Podcast · 12/09/2025 · 1h 21m

Bitcoin Optech 1 month ago

Bitcoin Optech newsletter #383 is here: - describes a fixed vulnerability affecting the NBitcoin library - summarizes the LNHANCE soft fork proposal - relays a call to action to benchmark Bitcoin script execution under GSR's varops budget - highlights discussion of optimizations to SLH-DSA (SPHINCS) post-quantum signatures - Optech Newsletter #383 Podcast

Bitcoin Optech Newsletter #383

This week’s newsletter describes a fixed vulnerability affecting the NBitcoin library. Also included are our regular sections summarizing discuss...

Bruno Garcia posted to Delving Bitcoin about a theoretical consensus failure in NBitcoin that could occur when using OP_NIP...

Bitcoin Optech Newsletter #383

This week’s newsletter describes a fixed vulnerability affecting the NBitcoin library. Also included are our regular sections summarizing discuss...

Moonsettler proposes a soft fork for LNHANCE now that all four of its constituent opcodes have updated BIPs and reference implementations...

Bitcoin Optech Newsletter #383

This week’s newsletter describes a fixed vulnerability affecting the NBitcoin library. Also included are our regular sections summarizing discuss...

Julian posted a call to action to benchmark Bitcoin script execution under the varops budget...

Bitcoin Optech Newsletter #383

This week’s newsletter describes a fixed vulnerability affecting the NBitcoin library. Also included are our regular sections summarizing discuss...

Continuing the discussions around hardening Bitcoin against quantum computing, conduition presented his work on optimizing the SPHINCS signing algorithm...

Bitcoin Optech Newsletter #383

This week’s newsletter describes a fixed vulnerability affecting the NBitcoin library. Also included are our regular sections summarizing discuss...

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!

Riverside.FM Studio

Bitcoin Optech 4 months ago

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 Newsletter #369 Recap Podcast

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

Fountain:

Bitcoin Optech Podcast • Bitcoin Optech: Newsletter #369 Recap • Listen on Fountain

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

Spotify:

Bitcoin Optech: Newsletter #369 Recap

Bitcoin Optech Podcast · Episode

Apple Podcasts:

Bitcoin Optech: Newsletter #369 Recap

Podcast Episode · Bitcoin Optech Podcast · 09/02/2025 · 1h 8m

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