Nostr notes by Bitcoin Optech

Bitcoin Optech newsletter #428 is here: - describes a design for ...

2026-10-23T11:19:18Z

Bitcoin Optech newsletter #428 is here:

- describes a design for a single-issuer layer 2 whose users can redeem their bitcoin onchain without the issuer’s cooperation
- summarizes a proposal for including hash preimages in output script descriptors.
- summarizes changes to services/client software
- Optech Newsletter #428 Podcast
https://bitcoinops.org/en/newsletters/2026/10/23/

Adam Gibson posted to the Bitcoin-Dev mailing list a paper and proof-of-concept code for Lichen, a design in which a single issuer, which Gibson calls a hub, mints tokens redeemable one-to-one for bitcoin on a layer 2 ledger run by a server called the sequencer...
https://bitcoinops.org/en/newsletters/2026/10/23/#trust-minimized-exits-from-a-single-issuer-layer-2

João Dias posted to Delving Bitcoin a proposal for extending BIP379 to add a private form for hash fragments to miniscript...
https://bitcoinops.org/en/newsletters/2026/10/23/#descriptor-syntax-for-hash-preimages

Changes to services and client software:

- Ibis Wallet v5.0-beta released
- Landfall wallet for Lightning mining payouts
- rbitcoin 0.8.0 released
https://bitcoinops.org/en/newsletters/2026/10/23/#changes-to-services-and-client-software

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

Bitcoin Optech newsletter #427 is here: - summarizes the ...

2026-10-16T09:19:55Z

Bitcoin Optech newsletter #427 is here:

- summarizes the disclosure of two denial-of-service vulnerabilities in older versions of Eclair
- describes a proposed scheme for running complex multi-round contracts inside Lightning channels
- Optech Newsletter #427 Podcast
https://bitcoinops.org/en/newsletters/2026/10/16/

Erick Cestari posted to Delving Bitcoin the responsible disclosure of two denial-of-service (DoS) vulnerabilities in the channel opening process of Eclair v0.14.0 and earlier...
https://bitcoinops.org/en/newsletters/2026/10/16/#disclosure-of-two-dos-vulnerabilities-fixed-in-eclair-v0-14-1

Adam Gibson posted to the Bitcoin-Dev mailing list about a proposal for protocol, called LN-GAP, to run complex, multi-round, two-party contracts inside a Lightning channel while settling disputes onchain in a constant number of transactions...
https://bitcoinops.org/en/newsletters/2026/10/16/#offchain-contracts-in-lightning-channels

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

Clara Shikhelman and Elias Rohrer joined Optech to discuss ...

2026-10-14T07:35:54Z

Clara Shikhelman and Elias Rohrer joined Optech to discuss Newsletter #426:

- Dynamic one-byte message type IDs for BIP324
- Discussion of conventions for tagged hash tags in BIPs
- Proposal for onchain, private bitcoin transfers with no consensus changes
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/10/13/

Fountain:
https://fountain.fm/episode/0Uw8C5KJbsAg4EvffBP6

Spotify:
https://open.spotify.com/episode/0TEq742yJpt46OPuWoCTJB

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-426-recap/id1674626983?i=1000796265109

Bitcoin Optech newsletter #426 is here: - links to a draft BIP ...

2026-10-09T12:56:40Z

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
https://bitcoinops.org/en/newsletters/2026/10/09/

Anthony Towns posted to the Bitcoin-Dev mailing list a draft BIP that lets each peer choose its own one-byte message type IDs for the messages it sends over the v2 P2P transport...
https://bitcoinops.org/en/newsletters/2026/10/09/#dynamic-one-byte-message-type-ids-for-bip324

Fabian Jahr posted to the Bitcoin-Dev mailing list asking whether BIPs that use BIP340 tagged hashes should include the BIP number in the tag...
https://bitcoinops.org/en/newsletters/2026/10/09/#discussion-of-conventions-for-tagged-hash-tags-in-bips

Misha Komarov posted to Delving Bitcoin about a proposal for a new metaprotocol built on top of Bitcoin, called Shielded Bitcoin, that would enable private transfers while requiring no changes in consensus...
https://bitcoinops.org/en/newsletters/2026/10/09/#proposal-for-onchain-private-bitcoin-transfers-with-no-consensus-changes

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

Matt Morehouse joined Optech to discuss Newsletter #425: - ...

2026-10-08T20:46:45Z

Matt Morehouse joined Optech to discuss Newsletter #425:

- Disclosure of two DoS vulnerabilities in Eclair
- Proposal for wallet label synchronization
- Continued discussion of PQC output types
- Block-wide signature aggregation via SNARKs
- Bounds on chain length with BIP54 time warp fixes
- Comparing covenant proposals for vaults
- Depots for probabilistic Lightning channels
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/10/06/

Fountain:
https://fountain.fm/episode/akIi1roC9AJICkFNTuPm

Spotify:
https://open.spotify.com/episode/2y7hgUUKli87HYJ59Zsvkq

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-425-recap/id1674626983?i=1000793920910

Bitcoin Optech newsletter #425 is here: - summarizes the ...

2026-10-02T14:48:57Z

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
https://bitcoinops.org/en/newsletters/2026/10/02/

Matt Morehouse posted to Delving Bitcoin the responsible disclosure of two denial-of-service (DoS) vulnerabilities affecting Eclair v0.13.1 and earlier...
https://bitcoinops.org/en/newsletters/2026/10/02/#disclosure-of-two-dos-vulnerabilities-in-eclair

Jakub posted to the Bitcoin-Dev mailing list to gauge interest in standardizing synchronization of wallet labels between wallets through a shared, untrusted store before writing a specification...
https://bitcoinops.org/en/newsletters/2026/10/02/#proposal-for-wallet-label-synchronization

Discussion continued following last month’s summary of Pieter Wuille’s Delving Bitcoin thread on post-quantum output types...
https://bitcoinops.org/en/newsletters/2026/10/02/#continued-discussion-of-pqc-output-types

Conduition posted to Delving Bitcoin a design sketch for compressing many post-quantum signatures in a block into a single SNARK...
https://bitcoinops.org/en/newsletters/2026/10/02/#block-wide-signature-aggregation-via-snarks

Pieter Wuille posted to Delving Bitcoin a proof that the two timestamp rules in the consensus cleanup proposal (BIP54) suffice to bound how many blocks can be mined in a chain of given work...
https://bitcoinops.org/en/newsletters/2026/10/02/#bounds-on-chain-length-with-bip54-time-warp-fixes

Lillian Wang posted to Delving Bitcoin and cross-posted to the Bitcoin-Dev mailing list a report comparing simplified vault constructions...
https://bitcoinops.org/en/newsletters/2026/10/02/#comparing-covenant-proposals-for-vaults

John Law posted to Delving Bitcoin a protocol in which an operator funds a single time-limited taproot output (a depot) that can host Lightning channels for many thousands or millions of users...
https://bitcoinops.org/en/newsletters/2026/10/02/#depots-for-probabilistic-lightning-channels

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

Ahmet Kurt and Jan B joined Optech to discuss Newsletter #424: - ...

2026-10-01T20:36:53Z

Ahmet Kurt and Jan B joined Optech to discuss Newsletter #424:

- Proposal for a post-quantum Lightning Network
- Selected Q&A from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/09/29/

Fountain:
https://fountain.fm/episode/mxW0PZYRkV5fEtgR5vKB

Spotify:
https://open.spotify.com/episode/2iRE3ZQdsImDbkCIVHHxjh

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-424-recap/id1674626983?i=1000792615968

Bitcoin Optech newsletter #424 is here: - describes a proposal ...

2026-09-25T13:17:43Z

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
https://bitcoinops.org/en/newsletters/2026/09/25/

Ahmet Kurt posted to Delving Bitcoin about a new proposal for upgrading the offchain surfaces of the Lightning Network to be quantum-secure, called PQLN...
https://bitcoinops.org/en/newsletters/2026/09/25/#proposal-for-a-post-quantum-lightning-network

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?
- Post-BIP110 fork is it necessary to resync from block 0?
- Can a Bitcoin node build a partial UTXO set from only the most recent blocks and use it to validate new transactions?
https://bitcoinops.org/en/newsletters/2026/09/25/#selected-qa-from-bitcoin-stack-exchange

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

Adam Gibson and Rob Segers joined Optech to discuss Newsletter ...

2026-09-16T13:20:14Z

Adam Gibson and Rob Segers joined Optech to discuss Newsletter #422:

- A protocol for probabilistic coinjoin and covert betting
- Update on silent payments light clients
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/09/15/

Fountain:
https://fountain.fm/episode/Xv9mnZeu3OmzOL7FC4Yk

Spotify:
https://open.spotify.com/episode/1UZS3VGb9VQMOI4eO7t6He

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-422-recap/id1674626983?i=1000789835229

Bitcoin Optech newsletter #422 is here: - describes a proposed ...

2026-09-11T15:00:29Z

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
https://bitcoinops.org/en/newsletters/2026/09/11/

Adam Gibson posted to Delving Bitcoin about Babilonia, a proposal for a new probabilistic coinjoin and covert betting protocol...
https://bitcoinops.org/en/newsletters/2026/09/11/#a-protocol-for-probabilistic-coinjoin-and-covert-betting

Rob Segers posted to the Bitcoin-Dev mailing list providing specifications for silent payments light clients and measuring performance of different ways to retrieve data from blocks...
https://bitcoinops.org/en/newsletters/2026/09/11/#update-on-silent-payments-light-clients

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

Bitcoin Optech newsletter #421 is here: - describes an idea for ...

2026-09-04T14:42:31Z

Bitcoin Optech newsletter #421 is here:

- describes an idea for pools to pay miners using silent payments in the coinbase transaction
- summarizes the responsible disclosure of a denial-of-service vulnerability affecting older versions of Core Lightning
- continues discussion of PQC output types
- summarizes the DropKick commit/reveal PQC rescue idea
- links to the SHRINCS draft BIP
- examines several BIP448 and CSFS/CTV demos and applications
- Optech Newsletter #421 Podcast
https://bitcoinops.org/en/newsletters/2026/09/04/

average_gary posted to Delving Bitcoin about his idea for how pools could pay miners to different addresses directly in the coinbase transaction...
https://bitcoinops.org/en/newsletters/2026/09/04/#using-silent-payments-for-miner-payouts-in-coinbase-transaction

Erick Cestari posted to Delving Bitcoin the responsible disclosure of a critical denial-of-service (DoS) vulnerability affecting CLN nodes running versions prior to 25.09...
https://bitcoinops.org/en/newsletters/2026/09/04/#responsible-disclosure-of-a-denial-of-service-vulnerability-in-cln

Following last month’s summary of Pieter Wuille’s Delving Bitcoin thread on post-quantum output types, Wuille replied to Conduition’s argument that pairing CISA with P2TRv2 would strongly incentivize migration...
https://bitcoinops.org/en/newsletters/2026/09/04/#continued-discussion-of-pqc-output-types

Conduition posted to the Bitcoin-Dev mailing list a sketch of DropKick, a commit/reveal post-quantum rescue protocol for users who have not moved coins to PQC-enabled outputs by Q-day...
https://bitcoinops.org/en/newsletters/2026/09/04/#dropkick-commit-reveal-pqc-rescue

Conduition posted to the Bitcoin-Dev mailing list, on behalf of the SHRINCS working group, a first draft specifying SHRINCS as a semi-stateful hash-based signature scheme for Bitcoin...
https://bitcoinops.org/en/newsletters/2026/09/04/#shrincs-draft-bip

Work around BIP448 continues with new sites aggregating demos, implementations, and proofs of concept...
https://bitcoinops.org/en/newsletters/2026/09/04/#bip448-and-csfs-ctv-demos-and-applications

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

Bitcoin Optech newsletter #420 is here: - relays advance notice ...

2026-08-28T12:02:02Z

Bitcoin Optech newsletter #420 is here:

- relays advance notice of a planned Core Lightning security release
- summarizes a discussion about opt-in replay protection for potential future forks
- notes that the Hardware Wallet Interface (HWI) project will enter maintenance mode
- describes a request for comments on using block-range filters
- Optech Newsletter #420 Podcast
https://bitcoinops.org/en/newsletters/2026/08/28/

Christian Decker described a forthcoming CLN v26.06.7 point security release, noting no vulnerability is known to be actively exploited...
https://bitcoinops.org/en/newsletters/2026/08/28/#prepare-for-an-upcoming-core-lightning-security-release

Moonsettler posted to Delving Bitcoin to discuss the possibility of introducing an opt-in replay protection mechanism in case of future forks...
https://bitcoinops.org/en/newsletters/2026/08/28/#discussion-on-universal-opt-in-replay-protection

Ava Chow (achow101) announced that the Hardware Wallet Interface (HWI) project will scale back to maintenance-only work and eventually be archived...
https://bitcoinops.org/en/newsletters/2026/08/28/#hwi-repository-to-enter-maintenance-mode

Optout posted to Delving Bitcoin a request for comments (RFC) on a proposal to use block-range filters to reduce the total download size when using compact block filters...
https://bitcoinops.org/en/newsletters/2026/08/28/#request-for-comments-on-using-block-range-filters

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

Bastien Teinturier, Salvatore Ingala, and spacebear joined Optech ...

2026-08-26T14:19:31Z

Bastien Teinturier, Salvatore Ingala, and spacebear joined Optech to discuss Newsletter #419:

- Reorg vulnerability in LND channel closes
- Draft BIP for `rawtr()` output script descriptor
- Ledger Bitcoin app 2.5.0 adds human-readable policy descriptions
- Payjoin Dev Kit (rust-payjoin) 1.0.0 released
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/08/25/

Fountain:
https://fountain.fm/episode/eCyLsECYsnTuosdg9HxE

Spotify:
https://open.spotify.com/episode/4p15kurCtXcbuu1S51trRZ

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-419-recap/id1674626983?i=1000786057842

Michael Ford (fanquake) and Martin Zumsande joined Optech to ...

2026-08-18T20:04:06Z

Michael Ford (fanquake) and Martin Zumsande joined Optech to discuss Newsletter #418:

- Static Bitcoin Core binaries available for testing
- Replacing per-peer transaction rate-limiting with global rate limits
- Conditional message transfer contract to solve jamming
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/08/18/

Fountain:
https://fountain.fm/episode/2Qnr2qJdv4mJ5B4XZG0p

Spotify:
https://open.spotify.com/episode/1YdSHoN6QqpVkLnvh6cAWq

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-418-recap/id1674626983?i=1000784158766

Conduition, Ram, and Fabian Jahr joined Optech to discuss ...

2026-08-12T16:15:05Z

Conduition, Ram, and Fabian Jahr joined Optech to discuss Newsletter #417:

- Draft BIP for stale tip relay
- CISA for taproot keypath spends (BIP460)
- Segwit commitment to post-quantum witness data
- PQC output type discussion
- Input-triggered transaction expiry
- Layered quantum recovery of hashed addresses
- Segregated Data (SegData) BIP draft
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/08/11/

Fountain:
https://fountain.fm/episode/X3dpYvlQy2N6tO4DeQl3

Spotify:
https://open.spotify.com/episode/7wkE8AkAwXf7QIKlcO5cK4

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-417-recap/id1674626983?i=1000782982957

Bitcoin Optech newsletter #417 is here: - describes a draft BIP ...

2026-08-07T12:43:16Z

Bitcoin Optech newsletter #417 is here:

- describes a draft BIP for relaying stale block tips between peers
- summarizes a draft BIP for cross-input signature aggregation
- examines a design for attaching post-quantum witness data
- links to a discussion of post-quantum output types
- summarizes discussions around transaction expiry
- points to a proposal for layered quantum recovery of hashed addresses
- describes a proposal to add a prunable block region for arbitrary data
- Optech Newsletter #417 Podcast
https://bitcoinops.org/en/newsletters/2026/08/07/

Ram and w0xlt posted to the Bitcoin-Dev mailing list about the proposal for an opt-in P2P message for relaying stale tips between peers...
https://bitcoinops.org/en/newsletters/2026/08/07/#draft-bip-for-stale-tip-relay

Fabian Jahr posted to the Bitcoin-Dev mailing list a draft of BIP460 for transaction-wide cross-input signature aggregation (CISA) of taproot-style keypath spends...
https://bitcoinops.org/en/newsletters/2026/08/07/#cisa-for-taproot-keypath-spends-bip460

Pieter Wuille posted to Delving Bitcoin a design for attaching post-quantum witness data without repeating all of segwit’s deployment costs...
https://bitcoinops.org/en/newsletters/2026/08/07/#segwit-commitment-to-post-quantum-witness-data

Pieter Wuille opened a Delving Bitcoin thread to centralize discussion of post-quantum output types...
https://bitcoinops.org/en/newsletters/2026/08/07/#pqc-output-type-discussion

Josh Doman posted to Delving Bitcoin a construction for expiring HTLCs without free relay, then generalized it in a follow-up on input-triggered transaction expiry...
https://bitcoinops.org/en/newsletters/2026/08/07/#input-triggered-transaction-expiry

Shinobi posted to the Bitcoin-Dev mailing list and cross-posted to Delving Bitcoin a layered recovery plan for coins secured by hashed address types...
https://bitcoinops.org/en/newsletters/2026/08/07/#layered-quantum-recovery-of-hashed-addresses

MrHash posted to Delving Bitcoin companion BIP drafts for Segregated Data, a soft fork that would add a prunable, script-isolated block region for arbitrary data carriage...
https://bitcoinops.org/en/newsletters/2026/08/07/#segregated-data-segdata-bip-draft

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

Rob Hamilton, PortlandHODL, Chandra Pratap, and fabohax joined ...

2026-08-05T18:29:01Z

Rob Hamilton, PortlandHODL, Chandra Pratap, and fabohax joined Optech to discuss Newsletter #416:

- Move funds secured by COLDCARD-generated keys
- Wallets generated by COLDCARD at risk of theft
- Disclosure of two DoS vulnerabilities in Core Lightning
- Proof of concept for a zero-knowledge proof of reserves
- Selected Q&A from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/08/04/

Fountain:
https://fountain.fm/show/nnl3QRRuNyxBry8BBoH4

Spotify:
https://open.spotify.com/episode/3iTz1RULox5l93wkgqVtO9

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-416-recap/id1674626983?i=1000780099759

Bitcoin Optech newsletter #416 is here: - warns about a severe ...

2026-07-31T13:27:32Z

Bitcoin Optech newsletter #416 is here:

- warns about a severe vulnerability affecting wallets generated by COLDCARD signing devices
- summarizes the disclosure of two denial-of-service vulnerabilities in Core Lightning
- describes a proof of concept for a zero-knowledge proof of reserves
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #416 Podcast
https://bitcoinops.org/en/newsletters/2026/07/31/

If you used a COLDCARD to generate a wallet, any funds received by that wallet are at risk of theft and should be carefully moved to an unaffected wallet as soon as possible...
https://bitcoinops.org/en/newsletters/2026/07/31/#move-funds-secured-by-coldcard-generated-keys

On 30 July 2026, some Bitcoin users discovered that funds from their COLDCARD wallets had been stolen in a series of unexpected transactions on 29 July. Over the course of the day, a bug was identified in the firmware of the COLDCARD that causes wallets to be generated with insufficient entropy. As of this writing, estimated losses exceed 1,000 BTC, a figure that may continue to rise as the situation develops...
https://bitcoinops.org/en/newsletters/2026/07/31/#wallets-generated-by-coldcard-at-risk-of-theft

Chandra Pratap posted to Delving Bitcoin about two denial-of-service (DoS) vulnerabilities he found in Core Lightning...
https://bitcoinops.org/en/newsletters/2026/07/31/#disclosure-of-two-dos-vulnerabilities-in-core-lightning

fabohax posted about zkPoH (“zero-knowledge proof-of-hodl”), a proof of concept for a non-custodial proof of reserves system for Bitcoin...
https://bitcoinops.org/en/newsletters/2026/07/31/#proof-of-concept-for-a-zero-knowledge-proof-of-reserves

Selected Q&A from Bitcoin Stack Exchange
- What is Bitcoin’s objective definition of transaction neutrality?
- Why does BIP110’s decentralization benefit not outweigh its impact on transaction neutrality?
- Why does BIP110 require a 55% signaling threshold if its nodes reject non-signaling blocks?
- Why use ElligatorSwift encoding in BIP324?
- Was the OP_SUCCESSx reservation in BIP342 designed with specific opcode families in mind?
- What is the difference between the long-term feerate and the discard feerate?
- What is the quickest method for migrating a legacy wallet to a descriptor wallet on a pruned node?
- Is there historical data on orphan/stale block rates during high-fee periods?
https://bitcoinops.org/en/newsletters/2026/07/31/#selected-qa-from-bitcoin-stack-exchange

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

PSA: Wallets generated by Coldcard at risk! Wallets generated by ...

2026-07-31T01:22:21Z

PSA: Wallets generated by Coldcard at risk!

Wallets generated by Coldcard Mk3 using a firmware version 4.0.1 (March 2021) or later, up to the latest version may be vulnerable to theft, unless used in combination with a strong passphrase or entropy was generated externally.

Please see the Coinkite security advisory (https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/).

The attack is easy to reproduce with LLM assistance. There are reports that Mk2, Mk4, and Mk5 may be affected by (weaker) variants of the same vulnerability. If your wallet may be affected, please carefully move your funds to an unaffected wallet ASAP.

Fabian Jahr, Kruw, and Mojo joined Optech to discuss Newsletter ...

2026-07-28T20:12:46Z

Fabian Jahr, Kruw, and Mojo joined Optech to discuss Newsletter #415:

- Draft BIP for full aggregation of BIP340 signatures
- Changes to services and client software including Wasabi, Coinswap, Go secp256k1, an ASMap dashboard, Wavelength
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/07/28/

Fountain:
https://fountain.fm/episode/DwKaI4UBnN19MQJpcEPx

Spotify:
https://open.spotify.com/episode/6Dq72RsD8V9OxhdLc7UV7B

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-415-recap/id1674626983?i=1000778755233

Bitcoin Optech newsletter #415 is here: - describes a draft BIP ...

2026-07-24T12:35:35Z

Bitcoin Optech newsletter #415 is here:

- describes a draft BIP for full aggregation of BIP340 signatures
- summarizes changes to services/client software
- Optech Newsletter #415 Podcast
https://bitcoinops.org/en/newsletters/2026/07/24/

Fabian Jahr posted to the Bitcoin-Dev mailing list about a new draft BIP for full aggregation of BIP340 schnorr signatures, a standard for the DahLIAS aggregate signature scheme...
https://bitcoinops.org/en/newsletters/2026/07/24/#draft-bip-for-full-aggregation-of-bip340-signatures

Changes to services and client software:

- Wasabi Wallet 2.8.0 released
- Coinswap v0.2.2 released
- Go secp256k1 library announced
- ASMap dashboard announced
- Wavelength alpha released
https://bitcoinops.org/en/newsletters/2026/07/24/#changes-to-services-and-client-software

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

Keagan McClelland and Andrew Toth joined Optech to discuss ...

2026-07-21T20:15:34Z

Keagan McClelland and Andrew Toth joined Optech to discuss Newsletter #414:

- Formal verification of the Bitcoin protocol
- Bitcoin Core 30.3, Bitcoin Core 29.4
- Parallel input fetching in Bitcoin Core
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/07/21/

Fountain:
https://fountain.fm/episode/CvNXTopIBoxJuLpmT8Sg

Spotify:
https://open.spotify.com/episode/3sUFnSFebB8Ff3takKKqVZ

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-414-recap/id1674626983?i=1000777771807

Bitcoin Optech newsletter #414 is here: - describes a new project ...

2026-07-17T12:15:33Z

Bitcoin Optech newsletter #414 is here:

- describes a new project to apply formal verification to the Bitcoin protocol
- Bitcoin Core 30.3, Bitcoin Core 29.4
- Optech Newsletter #414 Podcast
https://bitcoinops.org/en/newsletters/2026/07/17/

Keagan McClelland posted to the Bitcoin-Dev mailing list and Delving Bitcoin about his effort to formally verify the Bitcoin protocol...
https://bitcoinops.org/en/newsletters/2026/07/17/#formal-verification-of-the-bitcoin-protocol

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

Sjors Provoost joined Optech to discuss Newsletter #413: - Using ...

2026-07-14T18:58:32Z

Sjors Provoost joined Optech to discuss Newsletter #413:

- Using fountain codes for IBD
- Bitcoin Core's IPC Mining Interface and Stratum v2
- Bitcoin Core 31.1, LND v0.20.2-beta
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/07/14/

Fountain:
https://fountain.fm/episode/Mr4DojGzekgbOrxFhJWN

Spotify:
https://open.spotify.com/episode/32i7t5aubUiGnu0GEOsxsa

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-413-recap/id1674626983?i=1000776800852

Bitcoin Optech newsletter #413 is here: - describes research into ...

2026-07-10T11:18:42Z

Bitcoin Optech newsletter #413 is here:

- describes research into using fountain codes to allow pruned nodes to contribute to initial block download
- Bitcoin Core 31.1, LND v0.20.2-beta
- Optech Newsletter #413 Podcast
https://bitcoinops.org/en/newsletters/2026/07/10/

Lucas Lima posted to Delving Bitcoin about his latest research on using fountain codes to allow pruned nodes to contribute to Initial Block Download (IBD), without significantly increasing their storage requirements...
https://bitcoinops.org/en/newsletters/2026/07/10/#using-fountain-codes-for-ibd

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

Conduition and Jeremy Rubin joined Optech to discuss Newsletter ...

2026-07-08T15:29:34Z

Conduition and Jeremy Rubin joined Optech to discuss Newsletter #412:

- Benchmarking SLH-DSA STARK aggregation
- Bird of Prey 2 (BoP-2) non-malleable schnorr and PQ signatures
- Lattice-based signatures
- Public key recovery for P2MR EC leaves
- Aligning privacy incentives in P2MR
- Prohibit merkle internal node preimages that encode minimal 64-byte transactions
- Triggering EC disabling with a NUMS point spend or hashrate majority
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/07/07/

Fountain:
https://fountain.fm/episode/y6XkElTaP2wZFzmAsY8n

Spotify:
https://open.spotify.com/episode/3tHQacI9FTEYW3J2uLDX4d

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-412-recap/id1674626983?i=1000775973839

Bitcoin Optech newsletter #412 is here: - links to benchmarking ...

2026-07-03T12:28:04Z

Bitcoin Optech newsletter #412 is here:

- links to benchmarking around SLH-DSA STARK aggregation
- points to discussion of a paper on constructing hybrid strongly-unforgeable signature schemes
- examines lattice-based PQ signatures
- describes a proposal for public key recovery for P2MR EC leaves
- summarizes a thread on aligning privacy incentives in P2MR
- describes and alternative to banning all 64-byte transactions
- summarizes a proposal to trigger EC disabling with a NUMS point spend or hashrate majority
- Optech Newsletter #412 Podcast
https://bitcoinops.org/en/newsletters/2026/07/03/

Remix7531 posted to the Bitcoin-Dev mailing list his benchmark results for aggregating many SPHINCS signature verifications into a single STARK proof...
https://bitcoinops.org/en/newsletters/2026/07/03/#benchmarking-slh-dsa-stark-aggregation

Pieter Wuille posted to Delving Bitcoin about a EuroCrypt 2026 paper on constructing hybrid strongly-unforgeable signature schemes from a schnorr-like scheme and an arbitrary post-quantum signature scheme...
https://bitcoinops.org/en/newsletters/2026/07/03/#bird-of-prey-2-bop-2-non-malleable-schnorr-and-pq-signatures

Nikita Karetnikov posted to Delving Bitcoin and cross-posted to the Bitcoin-Dev mailing list about a Blockstream blog post comparing post-quantum signature families, where lattice-based schemes appear favorable on size and functionality...
https://bitcoinops.org/en/newsletters/2026/07/03/#lattice-based-signatures

starius posted to Delving Bitcoin a proposal to add a recoverable elliptic curve (EC) key leaf type to BIP360 (P2MR). The idea is to recover the EC public key from the schnorr signature...
https://bitcoinops.org/en/newsletters/2026/07/03/#public-key-recovery-for-p2mr-ec-leaves

Conduition posted to the Bitcoin-Dev mailing list a proposed BIP360 (P2MR) change to require every P2MR control block to include at least one 32-byte merkle authentication path (i.e. ban depth-zero script trees)...
https://bitcoinops.org/en/newsletters/2026/07/03/#aligning-privacy-incentives-in-p2mr

Jeremy Rubin posted to the Bitcoin-Dev mailing list a draft BIP proposing an alternative to the consensus cleanup (BIP54) rule making 64-byte witness-stripped transactions consensus-invalid...
https://bitcoinops.org/en/newsletters/2026/07/03/#prohibit-merkle-internal-node-preimages-that-encode-minimal-64-byte-transactions

Pieter Wuille wrote to the Bitcoin-Dev mailing list about codifying the expected future disabling of elliptic curve (EC) spending paths within new post-quantum output types such as BIP360 (P2MR) and P2TRv2...
https://bitcoinops.org/en/newsletters/2026/07/03/#triggering-ec-disabling-with-a-nums-point-spend-or-hashrate-majority

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

Nishant Bansal and Matthew Zipkin joined Optech to discuss ...

2026-07-01T16:49:13Z

Nishant Bansal and Matthew Zipkin joined Optech to discuss Newsletter #411:

- LND zero-timestamp gossip DoS disclosure
- Removal of the libevent library in Bitcoin Core
- Selected Q&A from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/06/30/

Spotify:
https://open.spotify.com/episode/2A7v5pARVJ01i7gXxDxyun

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-411-recap/id1674626983?i=1000775030980

Bitcoin Optech newsletter #411 is here: - describes the ...

2026-06-26T11:48:32Z

Bitcoin Optech newsletter #411 is here:

- describes the responsible disclosure of a denial-of-service vulnerability that affected older versions of LND
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #411 Podcast
https://bitcoinops.org/en/newsletters/2026/06/26/

Nishant Bansal posted to Delving Bitcoin disclosing a denial-of-service vulnerability he discovered through state-machine fuzzing of LND’s gossip handling...
https://bitcoinops.org/en/newsletters/2026/06/26/#lnd-zero-timestamp-gossip-dos-disclosure

Selected Q&A from Bitcoin Stack Exchange
- Is it a bug that OP_IF is part of the tapscript opcodes?
- Why would forbidding OP_IF in tapscript be a problem?
- Does a softfork always succeed?
- How to set up Bitcoin Core to mine a valid block after the BIP110 activation in August 2026?
- Are BIP110 blocks on a branch with lower difficulty valid?
- What is the story behind Bitcoin test networks?
- Why was -datacarriersize redefined in 2022, and why was the 2023 proposal to expand it not merged?
- Are chains of 26 unconfirmed transactions prohibited by the wallet in Bitcoin Core 31.0?
- Are there changes in Bitcoin Core 29.0 that affect memory usage?
- What is Bitcoin Core’s release schedule?
https://bitcoinops.org/en/newsletters/2026/06/26/#selected-qa-from-bitcoin-stack-exchange

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

rkrux, Roland Bewick, and Steven Roose joined Optech to discuss ...

2026-06-24T10:59:31Z

rkrux, Roland Bewick, and Steven Roose joined Optech to discuss Newsletter #410:

- Discussion of removing RBF signaling from wallet transactions
- Changes to services and client software including Sparrow, Alby, JoinMarket NG, Bark, Arké, Noah
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/06/23/

Spotify:
https://open.spotify.com/episode/47quyifrpjUmeqHoZcm308

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-410-recap/id1674626983?i=1000773932392

Bitcoin Optech newsletter #410 is here: - summarizes a discussion ...

2026-06-19T12:15:26Z

Bitcoin Optech newsletter #410 is here:

- summarizes a discussion about wallets removing opt-in replace-by-fee signaling from the transactions they create
- summarizes changes to services/client software
- Optech Newsletter #410 Podcast
https://bitcoinops.org/en/newsletters/2026/06/19/

rkrux posted to the Bitcoin-Dev mailing list proposing that wallets stop signaling opt-in RBF in the transactions they create...
https://bitcoinops.org/en/newsletters/2026/06/19/#discussion-of-removing-rbf-signaling-from-wallet-transactions

Changes to services and client software:

- Sparrow Wallet 2.5.0 adds silent payments receiving
- Bark live on Bitcoin mainnet
- Arké Ark wallet announced
- Noah Ark wallet announced
- Alby Hub v1.23.0 released
- JoinMarket NG 0.32.0 released
https://bitcoinops.org/en/newsletters/2026/06/19/#changes-to-services-and-client-software

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

Vasil Dimov joined Optech to discuss Newsletter #409: - Draft BIP ...

2026-06-17T16:43:50Z

Vasil Dimov joined Optech to discuss Newsletter #409:

- Draft BIP for testnet5
- The bug in private transaction broadcast
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/06/16/

Spotify:
https://open.spotify.com/episode/1sOOad7jS2bJan4pIQXjlb

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-409-recap/id1674626983?i=1000773137157

Bitcoin Optech newsletter #409 is here: - describes a draft BIP ...

2026-06-12T11:58:28Z

Bitcoin Optech newsletter #409 is here:

- describes a draft BIP to replace the testnet4 test network with a successor
- Optech Newsletter #409 Podcast
https://bitcoinops.org/en/newsletters/2026/06/12/

Pol Espinasa posted to the Bitcoin-Dev mailing list a draft BIP, co-authored with Fabian Jahr, to replace testnet4 with testnet5...
https://bitcoinops.org/en/newsletters/2026/06/12/#draft-bip-for-testnet5

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

Pyth and Ademan joined Optech to discuss Newsletter #408: - ...

2026-06-10T15:28:27Z

Pyth and Ademan joined Optech to discuss Newsletter #408:

- Post-quantum BIP324
- QR signing payloads for miniscript wallets
- CTV-only vault proof of concept
- Post-quantum Lightning discussion
- Quantum attack game theory
- BIP54 64-byte transactions and potential legitimate uses
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/06/09/

Spotify:
https://open.spotify.com/episode/67RadnujhmE0AIZbfBDjJ0

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-408-recap/id1674626983?i=1000772045814

Bitcoin Optech newsletter #408 is here: - summarizes ideas to ...

2026-06-05T11:31:43Z

Bitcoin Optech newsletter #408 is here:

- summarizes ideas to make BIP324 transport encryption quantum secure
- describes a proposal to standardize QR-based signing payloads for miniscript wallets
- links to a CTV-only vault proof of concept
- outlines points from a post-quantum Lightning thread
- summarizes a quantum attack game theory post
- points to discussion of 64-byte transactions and potential uses
- Optech Newsletter #408 Podcast
https://bitcoinops.org/en/newsletters/2026/06/05/

Olaoluwa Osuntokun posted to the Bitcoin-Dev mailing list his thoughts on possible upgrades needed to make BIP324 quantum secure...
https://bitcoinops.org/en/newsletters/2026/06/05/#a-post-quantum-path-for-bip324

Pyth posted to Delving Bitcoin a proposal to standardize the data payloads exchanged between wallet coordinators and air-gapped signing devices over QR codes when using miniscript-based spending policies...
https://bitcoinops.org/en/newsletters/2026/06/05/#discussion-of-qr-signing-payloads-for-miniscript-wallets

Ademan announced on Delving Bitcoin the 0.1.0 release of his CTV (BIP119) vault project called MCCV (More Complicated CTV Vault)...
https://bitcoinops.org/en/newsletters/2026/06/05/#ctv-only-vault-proof-of-concept

Olaoluwa Osuntokun (roasbeef) posted to Delving Bitcoin a breakdown of how a post-quantum Lightning Network might look...
https://bitcoinops.org/en/newsletters/2026/06/05/#post-quantum-lightning-discussion

Jameson Lopp posted to Delving Bitcoin his blog post about the game theory of a quantum attack...
https://bitcoinops.org/en/newsletters/2026/06/05/#quantum-attack-game-theory

Jeremy Rubin wrote to the Bitcoin-Dev mailing list about potential legitimate uses for 64-byte witness-stripped transactions...
https://bitcoinops.org/en/newsletters/2026/06/05/#bip54-64-byte-transactions-and-potential-legitimate-uses

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

Chandra Pratap joined Optech to discuss Newsletter #407: - Core ...

2026-06-02T19:59:13Z

Chandra Pratap joined Optech to discuss Newsletter #407:

- Core Lightning assertion DoS disclosure
- Bitcoin Core developer meeting transcripts
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/06/02/

Spotify:
https://open.spotify.com/episode/3FXtYki8QCcpj3fQQP12y6

Apple:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-407-recap/id1674626983?i=1000770819043

Bitcoin Optech newsletter #407 is here: - announces the ...

2026-05-29T10:57:26Z

Bitcoin Optech newsletter #407 is here:

- announces the responsible disclosure of a vulnerability that allowed a remote peer to crash Core Lightning nodes
- links to transcripts from a recent Bitcoin Core developer meeting
- Optech Newsletter #407 Podcast
https://bitcoinops.org/en/newsletters/2026/05/29/

Chandra Pratap posted to Delving Bitcoin disclosing a denial-of-service vulnerability discovered during a Summer of Bitcoin 2025 internship...
https://bitcoinops.org/en/newsletters/2026/05/29/#core-lightning-assertion-dos-disclosure

Many Bitcoin Core developers met in person in May, and transcripts from the meeting have been published...
https://bitcoinops.org/en/newsletters/2026/05/29/#bitcoin-core-developer-meeting-transcripts

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

Oliver Gugger and 0xB10C joined Optech to discuss Newsletter ...

2026-05-26T18:57:23Z

Oliver Gugger and 0xB10C joined Optech to discuss Newsletter #406:

- Updates to BIP322's generic signed message format
- TCP hole punching to help Bitcoin nodes behind home routers accept inbound connections
- Changes to services and client software including Ibis Wallet, LDK Server, Mempool.space v3.3.0, and peer-observer P2P monitoring tooling
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/05/26/

Spotify:
https://open.spotify.com/episode/6dZrINmR28FeFeiyX6E6gr

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-406-recap/id1674626983?i=1000769691092

Bitcoin Optech newsletter #406 is here: - links to a discussion ...

2026-05-22T11:10:32Z

Bitcoin Optech newsletter #406 is here:

- links to a discussion of updates to BIP322’s generic signed message format
- describes an idea to use TCP hole punching to help Bitcoin nodes behind NATs accept inbound connections
- summarizes changes to services/client software
- Optech Newsletter #406 Podcast
https://bitcoinops.org/en/newsletters/2026/05/22/

Oliver Gugger posted to the Bitcoin-Dev mailing list about his ideas on how to round out BIP322...
https://bitcoinops.org/en/newsletters/2026/05/22/#significant-updates-to-bip322-generic-signed-message-format

0xB10C posted to Delving Bitcoin about an idea to make more nodes behind a home router NAT accept inbound connections...
https://bitcoinops.org/en/newsletters/2026/05/22/#tcp-hole-punching-for-bitcoin-nodes-behind-nats

Changes to services and client software:

- Ibis Wallet announced
- LDK Server announced
- Mempool.space v3.3.0 released
- peer-observer P2P monitoring tooling
https://bitcoinops.org/en/newsletters/2026/05/22/#changes-to-services-and-client-software

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

Fabian Jahr joined Optech to discuss Newsletter #405: - Bitcoin ...

2026-05-20T09:35:52Z

Fabian Jahr joined Optech to discuss Newsletter #405:

- Bitcoin Core script interpreter remote crash disclosure
- BIP proposal for UTXO set sharing over P2P network
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/05/19/

Spotify:
https://open.spotify.com/episode/2iFHsxvNugwC1ZRr4FbubC

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-405-recap/id1674626983?i=1000768710633

Bitcoin Optech newsletter #404 is here: - announces the ...

2026-05-15T14:59:18Z

Bitcoin Optech newsletter #404 is here:

- announces the responsible disclosure of a vulnerability that could allow an attacker with sufficient proof-of-work to crash Bitcoin Core nodes
- describes a draft BIP proposal for sharing the UTXO set over the P2P network
- Optech Newsletter #405 Podcast
https://bitcoinops.org/en/newsletters/2026/05/15/

Niklas Gögge posted to the Bitcoin-Dev mailing list disclosing CVE-2024-52911, a vulnerability affecting versions of Bitcoin Core after version 0.14.0 and before 29.0...
https://bitcoinops.org/en/newsletters/2026/05/15/#bitcoin-core-script-interpreter-remote-crash-disclosure

Fabian Jahr posted to the Bitcoin-Dev mailing list about a draft BIP for sharing the UTXO set over the P2P layer...
https://bitcoinops.org/en/newsletters/2026/05/15/#bip-proposal-for-utxo-set-sharing-over-p2p-network

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

Bitcoin Optech newsletter #404 is here: - describes possible ...

2026-05-08T07:22:10Z

Bitcoin Optech newsletter #404 is here:

- describes possible solutions to node fingerprinting
- links to discussion of using public fraud proofs to improve incentives around just-in-time channels
- Optech Newsletter #404 Podcast
https://bitcoinops.org/en/newsletters/2026/05/08/

Naiyoma posted to Delving Bitcoin about possible solutions to the node fingerprinting issue that uses the addr message timestamp to identify the same node on multiple networks...
https://bitcoinops.org/en/newsletters/2026/05/08/#possible-solutions-to-node-fingerprinting

Thomas Voegtlin posted to Delving Bitcoin about a new proposal for improving the game theory behind just-in-time (JIT) channels by using public fraud proofs to demonstrate that an LSP is misbehaving...
https://bitcoinops.org/en/newsletters/2026/05/08/#public-fraud-proof-for-just-in-time-channels

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

Toby Sharp joined Optech to discuss Newsletter #402: - Hornet ...

2026-05-01T21:19:48Z

Toby Sharp joined Optech to discuss Newsletter #402:

- Hornet Node's declarative executable specification of Bitcoin consensus rules
- Onion message jamming in the Lightning Network
- Selected Q&A from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/04/28/

Spotify:
https://open.spotify.com/episode/6FMbkM46QhnGJYh064JhwA

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-402-recap/id1674626983?i=1000765658933

Bitcoin Optech newsletter #403 is here: - describes research ...

2026-05-01T13:45:30Z

Bitcoin Optech newsletter #403 is here:

- describes research around using binary fuse filters as an alternative to the GCS used in compact block filters
- links to an idea for post-quantum HD wallets with fallback SPHINCS keys
- summarizes discussion of a post-quantum output type
- examines a proposal to embed post-quantum keys in tapscript without consensus changes
- summarizes results of a BIP54 demonstration of slow blocks on signet
- links to work on post-quantum BIP86 recovery using zk-STARK proofs of BIP32 seeds
- Optech Newsletter #403 Podcast
https://bitcoinops.org/en/newsletters/2026/05/01/

Csaba Purszki posted to Delving Bitcoin his research on finding a better alternative to Golomb-Rice Coded Sets (GCS) used for compact block filters as defined in BIP158...
https://bitcoinops.org/en/newsletters/2026/05/01/#binary-fuse-filters-as-an-alternative-to-bip158-s-gcs

In a post on the Bitcoin-Dev mailing list, Conduition described a design for post-quantum BIP32 congruent hierarchical deterministic wallets with fallback SPHINCS keys...
https://bitcoinops.org/en/newsletters/2026/05/01/#post-quantum-hd-wallets-with-fallback-sphincs-keys

Antoine Poinsot wrote to the Bitcoin-Dev mailing list defending a plain post-quantum output type (as opposed to a P2TR-like output type which allows quantum-vulnerable key spending to be disabled by a later soft fork)...
https://bitcoinops.org/en/newsletters/2026/05/01/#discussion-of-a-post-quantum-output-type

Daniel Buchner sent a proposal to the Bitcoin-Dev mailing list which describes a potential path to enabling flexible post-quantum wallet designs without fully describing the signature validation parameters...
https://bitcoinops.org/en/newsletters/2026/05/01/#proposal-to-embed-post-quantum-keys-in-tapscript-without-consensus-changes

On Delving Bitcoin, Antoine Poinsot wrote about a demonstration of the types of slow-to-validate blocks that BIP54 (consensus cleanup) prevents...
https://bitcoinops.org/en/newsletters/2026/05/01/#bip54-demonstration-of-slow-blocks-on-signet

Olaoluwa Osuntokun (roasbeef) posted on the Bitcoin-Dev mailing list his project to demonstrate zk-STARK recovery of quantum-vulnerable coins secured by keys derived using BIP32...
https://bitcoinops.org/en/newsletters/2026/05/01/#post-quantum-bip86-recovery-using-zk-stark-proofs-of-bip32-seeds

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

Bitcoin Optech newsletter #402 is here: - describes work on a ...

2026-04-24T15:12:51Z

Bitcoin Optech newsletter #402 is here:

- describes work on a declarative executable specification of consensus rules
- summarizes a discussion about onion message jamming in the Lightning Network
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #402 Podcast
https://bitcoinops.org/en/newsletters/2026/04/24/

Toby Sharp posted to Delving Bitcoin and the Bitcoin-Dev mailing list an update on the Hornet node project...
https://bitcoinops.org/en/newsletters/2026/04/24/#hornet-node-s-declarative-executable-specification-of-bitcoin-consensus-rules

Erick Cestari posted to Delving Bitcoin about the onion message jamming problem affecting the Lightning Network...
https://bitcoinops.org/en/newsletters/2026/04/24/#onion-message-jamming-in-the-lightning-network

Selected Q&A from Bitcoin Stack Exchange
- Why did BIP342 replace CHECKMULTISIG with a new opcode, instead of just removing FindAndDelete from it?
- Does SIGHASH_ANYPREVOUT commit to the tapleaf hash or the full taproot merkle path?
- What does the BIP86 tweak guarantee in a MuSig2 Lightning channel, beyond address format?
https://bitcoinops.org/en/newsletters/2026/04/24/#selected-qa-from-bitcoin-stack-exchange

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

Remix7531 and Luis Schwab joined Optech to discuss Newsletter ...

2026-04-22T11:06:35Z

Remix7531 and Luis Schwab joined Optech to discuss Newsletter #401:

- Nested MuSig2 for k-of-n multisignature Lightning nodes
- Formal verification of secp256k1 modular scalar multiplication
- Changes to services and client software including Utreexo software and others
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/04/21/

Spotify:
https://open.spotify.com/episode/4A7d3nR1mDvGi1zPA6pZZC

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-401-recap/id1674626983?i=1000763037535

Bitcoin Optech newsletter #401 is here: - describes an idea for ...

2026-04-17T13:33:07Z

Bitcoin Optech newsletter #401 is here:

- describes an idea for nested MuSig2 Lightning nodes
- summarizes a project formally verifying secp256k1’s modular scalar multiplication
- summarizes changes to services/client software
- Optech Newsletter #401 Podcast
https://bitcoinops.org/en/newsletters/2026/04/17/

ZmnSCPxj posted to Delving Bitcoin about the idea to create k-of-n multisignature Lightning nodes by leveraging nested MuSig2...
https://bitcoinops.org/en/newsletters/2026/04/17/#discussion-of-using-nested-musig2-in-the-lightning-network

Remix7531 posted to the Bitcoin-Dev mailing list about formally verifying secp256k1’s modular scalar multiplication...
https://bitcoinops.org/en/newsletters/2026/04/17/#formal-verification-of-secp256k1-modular-scalar-multiplication

Changes to services and client software:

- Coldcard 6.5.0 adds MuSig2 and miniscript
- Frigate 1.4.0 released
- Bitcoin Backbone updates
- Utreexod 0.5 released
https://bitcoinops.org/en/newsletters/2026/04/17/#changes-to-services-and-client-software

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

Julian Moik joined Optech to discuss Newsletter #400: - The ...

2026-04-14T18:44:54Z

Julian Moik joined Optech to discuss Newsletter #400:

- The ‘Testing Bitcoin Core 31.0 Release Candidates’ Bitcoin Core PR Review Club
- Great Script Restoration BIPs 440, 441
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/04/14/

Fountain:
https://fountain.fm/episode/eyMcRT2y0bMpoufODA23

Spotify:
https://open.spotify.com/episode/46ZPLlnesEjnxCZXhhi4zs

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-400-recap/id1674626983?i=1000761362599

Bitcoin Optech newsletter #400 is here: - recaps the "Testing ...

2026-04-10T10:36:11Z

Bitcoin Optech newsletter #400 is here:

- recaps the "Testing Bitcoin Core 31.0 Release Candidates" PR Review Club meeting
- Optech Newsletter #400 Podcast
https://bitcoinops.org/en/newsletters/2026/04/10/

'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...
https://bitcoinops.org/en/newsletters/2026/04/10/#bitcoin-core-pr-review-club

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

Armin Sabouri, Pyth, Conduition, and Jonas Nick joined Optech to ...

2026-04-07T19:39:07Z

Armin Sabouri, Pyth, Conduition, and Jonas Nick joined Optech to discuss Newsletter #399:

- Wallet fingerprinting risks for payjoin privacy
- A draft BIP for a wallet backup metadata format
- Compact isogeny post-quantum cryptography
- The SHRIMPS post-quantum signature construction
- Great Script Restoration BIPs 440, 441
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/04/07/

Spotify:
https://open.spotify.com/episode/3iVJWrMCGVQHziN3sUpxem

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-399-recap/id1674626983?i=1000760106835

Bitcoin Optech newsletter #399 is here: - describes how wallet ...

2026-04-03T10:58:57Z

Bitcoin Optech newsletter #399 is here:

- describes how wallet fingerprinting can damage payjoin privacy
- summarizes a proposal for a wallet backup metadata format
- links to post-quantum research using Isogenies
- points to the recently assigned BIPs for GSR
- examines SHRIMPS post-quantum signatures
- Optech Newsletter #399 Podcast
https://bitcoinops.org/en/newsletters/2026/04/03/

Armin Sabouri posted to Delving Bitcoin about how differences in payjoin implementations make it possible to fingerprint payjoin transactions and can damage payjoin’s privacy...
https://bitcoinops.org/en/newsletters/2026/04/03/#wallet-fingerprinting-risks-for-payjoin-privacy

Pythcoiner posted to the Bitcoin-Dev mailing list about a new proposal for a common structure for wallet backup metadata...
https://bitcoinops.org/en/newsletters/2026/04/03/#draft-bip-for-a-wallet-backup-metadata-format

Conduition wrote on Delving Bitcoin about his research into the suitability of Isogeny-Based Cryptography (IBC) as a post-quantum cryptosystem for Bitcoin...
https://bitcoinops.org/en/newsletters/2026/04/03/#compact-isogeny-pqc-can-replace-hd-wallets-key-tweaking-silent-payments

Rusty Russell wrote on the Bitcoin-Dev mailing list that the first two BIPs of the Great Script Restoration (or Grand Script Renaissance) have been submitted for BIP numbering...
https://bitcoinops.org/en/newsletters/2026/04/03/#varops-budget-and-tapscript-leaf-0xc2-aka-script-restoration-are-bips-440-and-441

Jonas Nick writes on Delving Bitcoin about a new semi-stateful hash-based signature construction for post-quantum Bitcoin...
https://bitcoinops.org/en/newsletters/2026/04/03/#shrimps-2-5-kb-post-quantum-signatures-across-multiple-stateful-devices

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

Dusty Daemon joined Optech to discuss Newsletter #398: - Selected ...

2026-03-31T19:04:24Z

Dusty Daemon joined Optech to discuss Newsletter #398:

- Selected Q&A from the Bitcoin Stack Exchange
- Splicing spec merged
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/03/31/

Spotify:
https://open.spotify.com/episode/4JyRC1yZAo79CjTTlYWa8b

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-398-recap/id1674626983?i=1000758484356

Bitcoin Optech newsletter #398 is here: - summarizes popular ...

2026-03-27T10:05:08Z

Bitcoin Optech newsletter #398 is here:

- summarizes popular Q&A from Stack Exchange
- Bitcoin Core 28.4, Core Lightning 26.04rc1
- Optech Newsletter #398 Podcast
https://bitcoinops.org/en/newsletters/2026/03/27/

Selected Q&A from Bitcoin Stack Exchange
- What is meant by “Bitcoin doesn’t use encryption”?
- When and why did Bitcoin Script shift to a commit–reveal structure?
- Does P2TR-MS (Taproot M-of-N multisig) leak public keys?
- Does OP_CHECKSIGFROMSTACK intentionally allow cross-UTXO signature reuse?
https://bitcoinops.org/en/newsletters/2026/03/27/#selected-qa-from-bitcoin-stack-exchange

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 ...

2026-03-24T19:41:14Z

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:
https://bitcoinops.org/en/podcast/2026/03/24/

Spotify:
https://open.spotify.com/episode/5Spre9stjgP0iiSjZPrNB7

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-397-recap/id1674626983?i=1000757113427

Bitcoin Optech newsletter #397 is here: - summarizes changes to ...

2026-03-20T11:46:01Z

Bitcoin Optech newsletter #397 is here:

- summarizes changes to services/client software including Cake, Sparrow, FIBRE, and more
- Bitcoin Core 31.0rc1
- Optech Newsletter #397 Podcast
https://bitcoinops.org/en/newsletters/2026/03/20/

Changes to services and client software:

- Cake Wallet adds Lightning support
- Sparrow 2.4.0 and 2.4.2 released
- Blockstream Jade adds Lightning via Liquid
- Lightning Labs releases agent tools
- Tether launches MiningOS
- FIBRE network relaunched
- TUI for Bitcoin Core released
https://bitcoinops.org/en/newsletters/2026/03/20/#changes-to-services-and-client-software

Bitcoin Core 31.0rc1 is a release candidate for the next major version of the predominant full node implementation. A testing guide is available...
https://bitcoinops.org/en/newsletters/2026/03/20/#bitcoin-core-31-0rc1

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

Jonathan Harvey-Buschel joined Optech to discuss Newsletter #396: ...

2026-03-17T19:34:14Z

Jonathan Harvey-Buschel joined Optech to discuss Newsletter #396:

- Collision-resistant hash function for Bitcoin Script
- Continued discussion of Gossip Observer traffic analysis tool
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/03/17/

Fountain:
https://fountain.fm/episode/kr8hTL0nldH8CQ7SCt5v

Spotify:
https://open.spotify.com/episode/4u9tGb93ZZxKWCsgnsa3Pb

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-396-recap/id1674626983?i=1000755815619

Bitcoin Optech newsletter #396 is here: - describes a ...

2026-03-13T13:49:32Z

Bitcoin Optech newsletter #396 is here:

- describes a collision-resistant hash function using Bitcoin Script
- summarizes continued discussion of Lightning Network traffic analysis
- Optech Newsletter #396 Podcast
https://bitcoinops.org/en/newsletters/2026/03/13/

Robin Linus posted to Delving Bitcoin about Binohash, a new collision-resistant hash function using Bitcoin Script…
https://bitcoinops.org/en/newsletters/2026/03/13/#collision-resistant-hash-function-for-bitcoin-script

Jonathan Harvey-Buschel posted updates about Gossip Observer, a tool for collecting LN gossip traffic and computing metrics to evaluate replacing message flooding with a set-reconciliation-based protocol…
https://bitcoinops.org/en/newsletters/2026/03/13/#continued-discussion-of-gossip-observer-traffic-analysis-tool

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

Jon McAlpine, Antoine Poinsot, Mike Casey, and Ethan Heilman ...

2026-03-11T17:59:23Z

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:
https://bitcoinops.org/en/podcast/2026/03/10/

Fountain:
https://fountain.fm/episode/662j7DIN0bkqLa4UPCyQ

Spotify:
https://open.spotify.com/episode/0rTY9h9m56q19wgPAjLax1

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-395-recap/id1674626983?i=1000754691086

Bitcoin Optech newsletter #395 is here: - describes a standard ...

2026-03-06T14:16:32Z

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
https://bitcoinops.org/en/newsletters/2026/03/06/

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...
https://bitcoinops.org/en/newsletters/2026/03/06/#a-standard-for-stateless-vtxo-verification

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...
https://bitcoinops.org/en/newsletters/2026/03/06/#draft-bip-for-expanded-nversion-nonce-space-for-miners

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...
https://bitcoinops.org/en/newsletters/2026/03/06/#extensions-to-standard-tooling-for-templatehash-csfs-ik-support

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...
https://bitcoinops.org/en/newsletters/2026/03/06/#hourglass-v2-update

Ethan Heilman wrote on the Bitcoin-Dev mailing list regarding the potential need for RFC7696 Cryptographic Algorithm Agility in Bitcoin...
https://bitcoinops.org/en/newsletters/2026/03/06/#algorithm-agility-for-bitcoin

Pieter Wuille wrote to the Bitcoin-Dev mailing list about the limitations of the cryptographic agility...
https://bitcoinops.org/en/newsletters/2026/03/06/#the-limitations-of-cryptographic-agility-in-bitcoin

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

Craig Raw and Fabian Jahr joined Optech to discuss Newsletter ...

2026-03-03T21:18:54Z

Craig Raw and Fabian Jahr joined Optech to discuss Newsletter #394:

- Draft BIP for output script descriptor annotations
- ASMap in Bitcoin Core
- Bitcoin Stack Exchange questions about BIP324 and spy mining
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/03/03/

Fountain:
https://fountain.fm/episode/ZSsrDWgcl4JV5lFgcmGv

Spotify:
https://open.spotify.com/episode/3HZ8S2MzqUesdXF9MlaR3G

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-394-recap/id1674626983?i=1000752939548

Bitcoin Optech newsletter #394 is here: - looks at a proposed BIP ...

2026-02-27T11:25:05Z

Bitcoin Optech newsletter #394 is here:

- looks at a proposed BIP for including supplemental information with output script descriptors
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #394 Podcast
https://bitcoinops.org/en/newsletters/2026/02/27/

Craig Raw posted to the Bitcoin-Dev mailing list about a new BIP idea to provide useful metadata in the form of annotations, expressed as key/value pairs, appended directly to the descriptor...
https://bitcoinops.org/en/newsletters/2026/02/27/#draft-bip-for-output-script-descriptor-annotations

Selected Q&A from Bitcoin Stack Exchange
- Is Bitcoin BIP324 v2 P2P transport distinguishable from random traffic?
- What if a miner just broadcasts the header and never gives the block?
https://bitcoinops.org/en/newsletters/2026/02/27/#selected-qa-from-bitcoin-stack-exchange

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

Misha Komarov, Erik De Smedt, and arbedout joined Optech to ...

2026-02-24T20:25:53Z

Misha Komarov, Erik De Smedt, and arbedout joined Optech to discuss Newsletter #393:

- Recent OP_RETURN output statistics
- Bitcoin PIPEs v2
- Changes to services and client software including: hArk-based Ark software, Sigbash v2 and others
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/02/24/

Fountain:
https://fountain.fm/episode/F0j1y6kbC1r7M0zINYM6

Spotify:
https://open.spotify.com/episode/7BT9NHtzQGFZegi2UC98OK

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-393-recap/id1674626983?i=1000751237921

Sebastian Falbesoner and Oleksandr Kurbatov joined Optech to ...

2026-02-24T17:10:40Z

Sebastian Falbesoner and Oleksandr Kurbatov joined Optech to discuss Newsletter #392:

- Proposal to limit the number of per-group silent payment recipients
- BLISK, Boolean circuit Logic Integrated into the Single Key
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/02/17/

Fountain:
https://fountain.fm/episode/cepxpUMU4sikCSbeUtDQ

Spotify:
https://open.spotify.com/episode/0EhHSmQZcDmBYZkTfzPdlT

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-392-recap/id1674626983?i=1000751215295

Bitcoin Optech newsletter #393 is here: - summarizes a discussion ...

2026-02-20T13:20:45Z

Bitcoin Optech newsletter #393 is here:

- summarizes a discussion about recent OP_RETURN usage
- describes a protocol to enforce covenant-like spending conditions without consensus changes
- summarizes changes to services/client software including Ark software, silent payment and submarine swap support, and more
- Optech Newsletter #393 Podcast
https://bitcoinops.org/en/newsletters/2026/02/20/

Anthony Towns posted to Delving about the recent OP_RETURN statistics since the release of Bitcoin Core v30.0 on October 10...
https://bitcoinops.org/en/newsletters/2026/02/20/#recent-op-return-output-statistics

Misha Komarov posted to Delving Bitcoin about Bitcoin PIPEs, a protocol that allows enforcement of spending conditions without the need for consensus changes or optimistic challenge mechanisms...
https://bitcoinops.org/en/newsletters/2026/02/20/#bitcoin-pipes-v2

Changes to services and client software:
- Second releases hArk-based Ark software
- Amboss announces RailsX
- Nunchuk adds silent payment support
- Electrum adds submarine swap features
- Sigbash v2 announced
https://bitcoinops.org/en/newsletters/2026/02/20/#changes-to-services-and-client-software

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

Bitcoin Optech newsletter #392 is here: - summarizes discussion ...

2026-02-13T09:10:24Z

Bitcoin Optech newsletter #392 is here:

- summarizes discussion of improving worst-case silent payment scanning performance
- describes an idea for enabling many spending conditions in a single key
- Optech Newsletter #392 Podcast
https://bitcoinops.org/en/newsletters/2026/02/13/

Sebastian Falbesoner posted to the Bitcoin-Dev mailing list the discovery and mitigation of a theoretical attack on silent payment recipients...
https://bitcoinops.org/en/newsletters/2026/02/13/#proposal-to-limit-the-number-of-per-group-silent-payment-recipients

Oleksandr Kurbatov posted to Delving Bitcoin about BLISK, a protocol designed to express complex authorization policies using boolean logic...
https://bitcoinops.org/en/newsletters/2026/02/13/#blisk-boolean-circuit-logic-integrated-into-the-single-key

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

Toby Sharp, Chris Hyunhum Cho, Jonas Nick, and Antoine Poinsot ...

2026-02-12T15:37:42Z

Toby Sharp, Chris Hyunhum Cho, Jonas Nick, and Antoine Poinsot joined Optech to discuss Newsletter #391:

- Work on a constant-time parallelized UTXO database
- A new higher level language for writing Bitcoin Script
- An idea to mitigate dust attacks
- Changing consensus including BIP54 consensus cleanup and post-quantum signature discussions including SHRINCS, Falcon, and SLH-DSA verification performance
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/02/10/

Fountain:
https://fountain.fm/episode/l0uUTumdZY0kAla2qy4v

Spotify:
https://open.spotify.com/episode/6tEcuY5BSywl3cacrpaOpP

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-391-recap/id1674626983?i=1000749307135

Bitcoin Optech newsletter #391 is here: - links to work on a ...

2026-02-06T11:46:04Z

Bitcoin Optech newsletter #391 is here:

- links to work on a constant-time parallelized UTXO database
- summarizes a new high-level language for writing Bitcoin Script
- describes an idea to mitigate dust attacks
- covers the SHRINCS 324-byte stateful post-quantum signatures with static backups paper
- highlights discussion to address remaining points on BIP54
- summarizes the Falcon post-quantum signature scheme proposal
- links to research showing SLH-DSA verification can compete with ECC
- Optech Newsletter #391 Podcast
https://bitcoinops.org/en/newsletters/2026/02/06/

Toby Sharp posted to Delving Bitcoin about his latest project, a custom, highly parallel UTXO database, with constant-time queries, called Hornet UTXO(1)...
https://bitcoinops.org/en/newsletters/2026/02/06/#a-constant-time-parallelized-utxo-database

Hyunhum Cho wrote on Delving Bitcoin about his work on Bithoven which is an alternative to miniscript...
https://bitcoinops.org/en/newsletters/2026/02/06/#bithoven-a-formally-verified-imperative-language-for-bitcoin-script

Bubb1es posted to Delving Bitcoin about a way to dispose of dust attacks in onchain wallets...
https://bitcoinops.org/en/newsletters/2026/02/06/#discussion-of-dust-attack-mitigations

Following-up on the Hash-based Signature Schemes for Bitcoin, Jonas Nick detailed on Delving Bitcoin a specific hash-based quantum-resistant signature algorithm with potentially useful properties for use in Bitcoin...
https://bitcoinops.org/en/newsletters/2026/02/06/#shrincs-324-byte-stateful-post-quantum-signatures-with-static-backups

Antoine Poinsot wrote about the remaining points of discussion for the consensus cleanup soft fork...
https://bitcoinops.org/en/newsletters/2026/02/06/#addressing-remaining-points-on-bip54

Giulio Golinelli posted on the mailing list proposing a fork to enable Falcon signature verification to Bitcoin...
https://bitcoinops.org/en/newsletters/2026/02/06/#falcon-post-quantum-signature-scheme-proposal

Conduition wrote about his ongoing work benchmarking his post-quantum SLH-DSA verification implementation against libsecp256k1...
https://bitcoinops.org/en/newsletters/2026/02/06/#slh-dsa-verification-can-compete-with-ecc

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

Liam Eagen joined Optech to discuss Newsletter #390: - The Argo ...

2026-02-04T20:06:58Z

Liam Eagen joined Optech to discuss Newsletter #390:

- The Argo garbled-circuits scheme
- An LN-Symmetry update
- 5 questions from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/02/03/

Fountain:
https://fountain.fm/episode/LCVHpTWDFbYJyG789W3L

Spotify:
https://open.spotify.com/episode/1RoYtObqP6LEN0HF6metMH

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-390-recap/id1674626983?i=1000748247314

Bitcoin Optech newsletter #390 is here: - summarizes a more ...

2026-01-30T09:02:21Z

Bitcoin Optech newsletter #390 is here:

- summarizes a more efficient approach to garbled circuits
- links to an LN-Symmetry update
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #390 Podcast
https://bitcoinops.org/en/newsletters/2026/01/30/

Robin Linus posted to Delving Bitcoin about a new paper by Liam Eagen and Ying Tong Lai describing a technique that will enable 1000 times more efficient garbled locks...
https://bitcoinops.org/en/newsletters/2026/01/30/#argo-a-garbled-circuits-scheme-with-more-efficient-off-chain-computation

Gregory Sanders posted an update to Delving Bitcoin about his previous work on LN-Symmetry...
https://bitcoinops.org/en/newsletters/2026/01/30/#ln-symmetry-update

Selected Q&A from Bitcoin Stack Exchange
- What is stored in dbcache and with what priority?
- Can one do a coinjoin in Shielded CSV?
- In Bitcoin Core, how to use Tor for broadcasting new transactions only?
- Brassard-Høyer-Tapp (BHT) algorithm and Bitcoin (BIP360)
- Why does BitHash alternate sha256 and ripmed160?
https://bitcoinops.org/en/newsletters/2026/01/30/#selected-qa-from-bitcoin-stack-exchange

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

René Pickhardt joined Optech to discuss Newsletter #389: - A ...

2026-01-27T20:04:22Z

René Pickhardt joined Optech to discuss Newsletter #389:

- A mathematical theory of payment channel networks
- 2 updates to services and client software
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/01/27/

Fountain:
https://fountain.fm/episode/QO5rMIVxPbZw1bO6abkj

Spotify:
https://open.spotify.com/episode/5KACVM4RzIGjsBrgXJ5aAv

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-389-recap/id1674626983?i=1000746907140

Bitcoin Optech newsletter #389 is here: - links to a paper on the ...

2026-01-23T11:18:18Z

Bitcoin Optech newsletter #389 is here:

- links to a paper on the study of payment channel networks
- summarizes changes to services/client software including an Electrum server for testing silent payments and a BDK WASM library
- Optech Newsletter #389 Podcast
https://bitcoinops.org/en/newsletters/2026/01/23/

René Pickhardt posted to Delving Bitcoin about the publication of his new paper called “A Mathematical Theory of Payment Channel Network”...
https://bitcoinops.org/en/newsletters/2026/01/23/#a-mathematical-theory-of-payment-channel-networks

Changes to services and client software:
- Electrum server for testing silent payments
- BDK WASM library
https://bitcoinops.org/en/newsletters/2026/01/23/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter on http://Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.com/studio/bitcoin-optech

More from our latest Optech Recap podcast: ...

2026-01-21T16:08:18Z

In reply to nevent1q…5qsr
_________________________

More from our latest Optech Recap podcast:

https://primal.net/e/nevent1qqsy9tgwyfg3e96hd0tacsatvq7lh86t2euu363pehrnalnh2ccqxscepwx80

Bruno Garcia explains his vision for incremental mutation testing ...

2026-01-21T16:06:36Z

Bruno Garcia explains his vision for incremental mutation testing in Bitcoin Core:

Bruno Garcia joined Optech to discuss Newsletter #388: - ...

2026-01-20T21:28:34Z

Bruno Garcia joined Optech to discuss Newsletter #388:

- Incremental mutation testing in Bitcoin Core
- BIP process updated
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/01/20/

Fountain:
https://fountain.fm/episode/TsQ3V8lAG5hrYWMbmXbn

Spotify:
https://open.spotify.com/episode/65vfvLBYDXG6I7scbT5cyO

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-388-recap/id1674626983?i=1000745948643

Craig Raw (@craigraw) on silent payments. From Optech Recap #387 ...

2026-01-16T16:36:55Z

Craig Raw (@craigraw) on silent payments. From Optech Recap #387

Bitcoin Optech newsletter #388 is here: - links to a discussion ...

2026-01-16T12:00:40Z

Bitcoin Optech newsletter #388 is here:

- links to a discussion of incremental mutation testing in Bitcoin Core
- announces deployment of a new BIP process
- Optech Newsletter #388 Podcast
https://bitcoinops.org/en/newsletters/2026/01/16/

Bruno Garcia posted to Delving Bitcoin about his current work on improving mutation testing in Bitcoin Core. Mutation testing is a technique that allows developers to assess the effectiveness of their tests by intentionally adding systemic bugs, called mutants, to the codebase...
https://bitcoinops.org/en/newsletters/2026/01/16/#an-overview-of-incremental-mutation-testing-in-bitcoin-core

After more than two months of discussion on the mailing list and another round of amendments to the proposal, it became clear this week that BIP3 had achieved rough consensus...
https://bitcoinops.org/en/newsletters/2026/01/16/#bip-process-updated

Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.com/studio/bitcoin-optech

René Pickhardt and Craig Raw joined Optech to discuss Newsletter ...

2026-01-14T15:44:29Z

René Pickhardt and Craig Raw joined Optech to discuss Newsletter #387:

- Bitcoin Core wallet migration bug
- Using Ark as a channel factory
- Draft BIP for silent payment descriptors
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2026/01/13/

Fountain:
https://fountain.fm/episode/CxvwArgstb80HNzZWxiC

Spotify:
https://open.spotify.com/episode/6jn03puzikUjsuQD4Bmp21

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-387-recap/id1674626983?i=1000745147513

Bitcoin Optech newsletter #387 is here: - warns of a wallet ...

2026-01-09T11:05:56Z

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
https://bitcoinops.org/en/newsletters/2026/01/09/

Bitcoin Core posted a notice of a bug in the legacy wallet migration feature in versions 30.0 and 30.1...
https://bitcoinops.org/en/newsletters/2026/01/09/#bitcoin-core-wallet-migration-bug

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...
https://bitcoinops.org/en/newsletters/2026/01/09/#using-ark-as-a-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...
https://bitcoinops.org/en/newsletters/2026/01/09/#draft-bip-for-silent-payment-descriptors

Bitcoin Optech will host an audio recap discussion of this newsletter on http://Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.com/studio/bitcoin-optech

Anthony Towns and Mikhail Kudinov joined Optech to discuss ...

2026-01-06T22:36:08Z

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:
https://bitcoinops.org/en/podcast/2026/01/06/

Fountain:
https://fountain.fm/episode/LSYvA10Nd4ToHfmuKhvX

Spotify:
https://open.spotify.com/episode/21GFU6WOODEv2s9F2NvBtB

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-386-recap/id1674626983?i=1000744026375

Bitcoin Optech newsletter #386 is here: - summarizes a vault-like ...

2026-01-02T12:04:56Z

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
https://bitcoinops.org/en/newsletters/2026/01/02/

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...
https://bitcoinops.org/en/newsletters/2026/01/02/#building-a-vault-using-blinded-co-signers

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...
https://bitcoinops.org/en/newsletters/2026/01/02/#peer-feature-negotiation

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...
https://bitcoinops.org/en/newsletters/2026/01/02/#year-2106-timestamp-overflow-uint64-migration

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...
https://bitcoinops.org/en/newsletters/2026/01/02/#relax-bip54-timestamp-restriction-for-2106-soft-fork

Chris Stewart posted to Delving Bitcoin a discussion of a “footgun” with OP_CHECKTEMPLATEVERIFY (CTV)...
https://bitcoinops.org/en/newsletters/2026/01/02/#understanding-and-mitigating-a-ctv-footgun

Developer 1440000bytes hosted a CTV (BIP119) activation meeting...
https://bitcoinops.org/en/newsletters/2026/01/02/#ctv-activation-meeting

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...
https://bitcoinops.org/en/newsletters/2026/01/02/#op-checkconsolidation-to-enable-cheaper-consolidations

Mikhail Kudinov and Jonas Nick posted to the Bitcoin-Dev mailing list about their work on evaluating hash-based signatures for use in Bitcoin...
https://bitcoinops.org/en/newsletters/2026/01/02/#hash-based-signatures-for-bitcoin-s-post-quantum-future

Bitcoin Optech will host an audio recap discussion of this newsletter on http://Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.com/studio/bitcoin-optech

Bastien Teinturier, Rearden Code, and Pieter Wuille joined Optech ...

2025-12-24T19:19:43Z

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:
https://bitcoinops.org/en/podcast/2025/12/23/

Spotify:
https://open.spotify.com/episode/5zOXBAt2NHVWEVtESfFD5P

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-385-2025-year-in-review-special/id1674626983?i=1000742621959

Bitcoin Optech newsletter #385: 2025 Year-in-Review Special is ...

2025-12-19T15:30:32Z

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
https://bitcoinops.org/en/newsletters/2025/12/19/

In 2025, Optech summarized more than a dozen vulnerability disclosures...
https://bitcoinops.org/en/newsletters/2025/12/19/#vulns

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.
https://bitcoinops.org/en/newsletters/2025/12/19/#quantum

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…
https://bitcoinops.org/en/newsletters/2025/12/19/#softforks

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....
https://bitcoinops.org/en/newsletters/2025/12/19/#stratumv2

Optech covered major releases of popular infrastructure projects throughout the year...
https://bitcoinops.org/en/newsletters/2025/12/19/#releases

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
https://bitcoinops.org/en/newsletters/2025/12/19/#optech

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!
https://riverside.fm/studio/bitcoin-optech

Matt Morehouse and Salvatore Ingala joined Optech to discuss ...

2025-12-16T20:37:40Z

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:
https://bitcoinops.org/en/podcast/2025/12/16/

Fountain:
https://fountain.fm/episode/ISFK9esZAmFyJFGGdafW

Spotify:
https://open.spotify.com/episode/2nvIdmLhoJRWKNQkynBVG8

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-384-recap/id1674626983?i=1000741577702

Bitcoin Optech newsletter #384 is here: - discloses ...

2025-12-12T10:46:01Z

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
https://bitcoinops.org/en/newsletters/2025/12/12/

Matt Morehouse posted to Delving Bitcoin about critical vulnerabilities fixed in LND 0.19.0...
https://bitcoinops.org/en/newsletters/2025/12/12/#critical-vulnerabilities-fixed-in-lnd-0-19-0

Salvatoshi posted to Delving Bitcoin about Vanadium, a virtualized secure enclave for hardware signing devices...
https://bitcoinops.org/en/newsletters/2025/12/12/#a-virtualized-secure-enclave-for-hardware-signing-devices

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
https://bitcoinops.org/en/newsletters/2025/12/12/#changes-to-services-and-client-software

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?
https://bitcoinops.org/en/newsletters/2025/12/12/#selected-qa-from-bitcoin-stack-exchange

Bitcoin Optech will host an audio recap discussion of this newsletter on http://Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.fm/studio/bitcoin-optech

Moonsettler and Julian joined Optech to discuss Newsletter #383: ...

2025-12-09T20:45:10Z

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:
https://bitcoinops.org/en/podcast/2025/12/09/

Fountain:
https://fountain.fm/episode/hWoSXyZivt2VIK3sD2m5

Spotify:
https://open.spotify.com/episode/7xoG5U9JOs579CkQhc1G58

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-383-recap/id1674626983?i=1000740473439

Bitcoin Optech newsletter #383 is here: - describes a fixed ...

2025-12-05T13:02:31Z

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
https://bitcoinops.org/en/newsletters/2025/12/05/

Bruno Garcia posted to Delving Bitcoin about a theoretical consensus failure in NBitcoin that could occur when using OP_NIP...
https://bitcoinops.org/en/newsletters/2025/12/05/#consensus-bug-in-nbitcoin-library

Moonsettler proposes a soft fork for LNHANCE now that all four of its constituent opcodes have updated BIPs and reference implementations...
https://bitcoinops.org/en/newsletters/2025/12/05/#lnhance-soft-fork

Julian posted a call to action to benchmark Bitcoin script execution under the varops budget...
https://bitcoinops.org/en/newsletters/2025/12/05/#benchmarking-the-varops-budget

Continuing the discussions around hardening Bitcoin against quantum computing, conduition presented his work on optimizing the SPHINCS signing algorithm...
https://bitcoinops.org/en/newsletters/2025/12/05/#slh-dsa-sphincs-post-quantum-signature-optimizations

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!
https://riverside.fm/studio/bitcoin-optech

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt ...

2025-12-03T18:49:36Z

Mark “Murch” Erhardt, Gustavo Flores Echaiz, and Mike Schmidt discuss Newsletter #382:

- Updated stats on compact block reconstructions
- A motion to activate BIP3 and replace the current BIP process
- 3 questions from the Bitcoin Stack Exchange
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/12/02/

Fountain:
https://fountain.fm/episode/93Jhx6LCQCiZDKQYppJ8

Spotify:
https://open.spotify.com/episode/3RlXvoyRoZW5Rw1u3GcsIM

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-382-recap/id1674626983?i=1000739533949

Bitcoin Optech newsletter #382 is here: - provides an update on ...

2025-11-28T14:17:07Z

Bitcoin Optech newsletter #382 is here:

- provides an update on compact block reconstruction discussions
- relays a call to activate BIP3
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #382 Podcast
https://bitcoinops.org/en/newsletters/2025/11/28/

0xB10C posted an update to Delving Bitcoin about his statistics around compact block reconstruction...
https://bitcoinops.org/en/newsletters/2025/11/28/#stats-on-compact-block-reconstructions-updates

Murch posted to the Bitcoin-Dev mailing list a formal motion to activate BIP3...
https://bitcoinops.org/en/newsletters/2025/11/28/#motion-to-activate-bip3

Selected Q&A from Bitcoin Stack Exchange:
- Do pruned nodes store witness inscriptions?
- Increasing probability of block hash collisions when difficulty is too high
- What is the purpose of the initial 0x04 byte in all extended public and private keys?
https://bitcoinops.org/en/newsletters/2025/11/28/#selected-qa-from-bitcoin-stack-exchange

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!
https://riverside.fm/studio/bitcoin-optech

Antoine Poinsot and ZmnSCPxj joined Optech to discuss Newsletter ...

2025-11-25T20:54:22Z

Antoine Poinsot and ZmnSCPxj joined Optech to discuss Newsletter #381:

- Modeling stale rates by propagation delay and mining centralization
- Private key handover for collaborative closure
- Updates to services and client software
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/11/25/

Fountain:
https://fountain.fm/episode/3zDWx0jj8JOTj9ukAoC6

Spotify:
https://open.spotify.com/episode/0BsoRU9mZZiLLlDYFtLo0W

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-381-recap/id1674626983?i=1000738423632

Bitcoin Optech newsletter #381 is here: - looks at an analysis of ...

2025-11-21T14:54:53Z

Bitcoin Optech newsletter #381 is here:

- looks at an analysis of how block propagation times may affect miner revenue
- describes a new approach for resolving protocols where multiple parties share funds
- summarizes changes to services/client software
- Optech Newsletter #381 Podcast
https://bitcoinops.org/en/newsletters/2025/11/21/

Antoine Poinsot posted to Delving Bitcoin about modeling stale block rates and how block propagation time affects a miner’s revenue as a function of its hashrate...
https://bitcoinops.org/en/newsletters/2025/11/21/#modeling-stale-rates-by-propagation-delay-and-mining-centralization

ZmnSCPxj posted to Delving Bitcoin about private key handover, an optimization that protocols can implement when funds, previously owned by two parties, need to be refunded to a single entity...
https://bitcoinops.org/en/newsletters/2025/11/21/#private-key-handover-for-collaborative-closure

Changes to services and client software:
- Arkade launches
- Mempool monitoring mobile application
- Web-based policy and miniscript IDE
- Phoenix Wallet adds taproot channels
- Nunchuk 2.0 launches
- LN gossip traffic analysis tool announced
https://bitcoinops.org/en/newsletters/2025/11/21/#changes-to-services-and-client-software

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!
https://riverside.fm/studio/bitcoin-optech

TheCharlatan joined Optech to discuss Newsletter #380: - The ...

2025-11-19T16:19:33Z

TheCharlatan joined Optech to discuss Newsletter #380:

- The Bitcoin Kernel
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/11/18/

Fountain:
https://fountain.fm/episode/Qmqqq6fCDHTZt1SL0xxi

Spotify:
https://open.spotify.com/episode/5qGvgMkll7x3KQviU8Vm65

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-380-recap/id1674626983?i=1000737307431

Sebastian Falbesoner, PortlandHODL, Tadge Dryja, and Antoine ...

2025-11-12T16:12:51Z

Sebastian Falbesoner, PortlandHODL, Tadge Dryja, and Antoine Poinsot joined Optech to discuss Newsletter #379:

- ECDSA signature validation in OpenSSL vs. libsecp256k1
- Multiple discussions about restricting data
- Post-quantum signature aggregation
- Native STARK proof verification in Bitcoin Script
- BIP54 implementation and test vectors
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/11/11/

Fountain:
https://fountain.fm/episode/6cQbKPDwMKQ2qu4HA14r

Spotify:
https://open.spotify.com/episode/26JrUei66sLjcgXHMzmsTU

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-379-recap/id1674626983?i=1000736447881

Bitcoin Optech newsletter #379 is here: - shares an analysis ...

2025-11-07T12:52:26Z

Bitcoin Optech newsletter #379 is here:

- shares an analysis comparing the historical performance of the OpenSSL and libsecp256k1 libraries
- highlights multiple discussions about restricting data
- summarizes a proposed post-quantum signature aggregation opcode
- summarizes an idea for STARK proof verification in Bitcoin Script
- updates progress on BIP54's consensus cleanup
- Optech Newsletter #379 Podcast
https://bitcoinops.org/en/newsletters/2025/11/07/

Sebastian Falbesoner posted to Delving about comparing the performance of ECDSA signature validation between OpenSSL and libsecp256k1 over the last decade...
https://bitcoinops.org/en/newsletters/2025/11/07/#comparing-performance-of-ecdsa-signature-validation-in-openssl-vs-libsecp256k1

Multiple conversations examined ideas to change the limits of various fields in consensus...
https://bitcoinops.org/en/newsletters/2025/11/07/#multiple-discussions-about-restricting-data

Tadge Dryja posted to the Bitcoin-Dev mailing list a proposal for an OP_CHECKINPUTVERIFY (OP_CIV) opcode that enables a locking script to commit to a specific UTXO being spent in the same transaction...
https://bitcoinops.org/en/newsletters/2025/11/07/#post-quantum-signature-aggregation

Abdelhamid Bakhta posted to Delving Bitcoin a detailed proposal for a new tapscript opcode OP_STARK_VERIFY which would enable the verification of a specific variant of STARK proof in Bitcoin Script...
https://bitcoinops.org/en/newsletters/2025/11/07/#native-stark-proof-verification-in-bitcoin-script

Antoine Poinsot posted to the Bitcoin-Dev mailing list an update on his consensus cleanup work on BIP54...
https://bitcoinops.org/en/newsletters/2025/11/07/#bip54-implementation-and-test-vectors

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!
https://riverside.fm/studio/bitcoin-optech

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter ...

2025-11-04T19:46:00Z

Mark “Murch” Erhardt and Mike Schmidt discuss Newsletter #378:

- Disclosure of four low-severity vulnerabilities in Bitcoin Core
- Q&A from Bitcoin Stack Exchange including questions on datacarriersize, OP_TEMPLATEHASH and others
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/11/04/

Fountain:
https://fountain.fm/episode/52iLDnzzU5I7rxb8coJT

Spotify:
https://open.spotify.com/episode/3gvj03rHM7qT0jTnQcMnfH

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-378-recap/id1674626983?i=1000735256317

Bitcoin Optech newsletter #378 is here: - announces four ...

2025-10-31T13:53:33Z

Bitcoin Optech newsletter #378 is here:

- announces four vulnerabilities affecting older versions of the Bitcoin Core full node
- summarizes popular Q&A from Stack Exchange
- Optech Newsletter #378 Podcast
https://bitcoinops.org/en/newsletters/2025/10/31/

Antoine Poinsot recently posted to the Bitcoin-Dev mailing list four Bitcoin Core security advisories for low-severity vulnerabilities that were fixed in Bitcoin Core 30.0...
https://bitcoinops.org/en/newsletters/2025/10/31/#disclosure-of-four-low-severity-vulnerabilities-in-bitcoin-core

Selected Q&A from Bitcoin Stack Exchange:
- Why was -datacarriersize redefined in 2022, and why was the 2023 proposal to expand it not merged?
- What is the smallest valid transaction that can be included in a block?
- Why does Bitcoin Core continue to give witness data a discount even when it is used for inscriptions?
- The ever-growing Bitcoin blockchain size?
- I read that OP_TEMPLATEHASH is a variant of OP_CTV. How do they differ?
https://bitcoinops.org/en/newsletters/2025/10/31/#selected-qa-from-bitcoin-stack-exchange

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!
https://riverside.fm/studio/bitcoin-optech

Abubakar Sadiq Ismail and Carla Kirk-Cohen joined Optech to ...

2025-10-29T14:38:50Z

Abubakar Sadiq Ismail and Carla Kirk-Cohen joined Optech to discuss Newsletter #377:

- Detecting block template feerate increases using cluster mempool
- Channel jamming mitigation simulation results and updates
- BULL wallet launches, Sparrow 2.3.0 released
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/28/

Fountain:
https://fountain.fm/episode/8ax8Sb0R5uFGbVnvja6L

Spotify:
https://open.spotify.com/episode/0tCMF2SY7a0RIBj0OPaoqM

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-377-recap/id1674626983?i=1000734046586

Francesco Madonna and supertestnet joined Optech to discuss ...

2025-10-28T19:38:38Z

Francesco Madonna and supertestnet joined Optech to discuss Newsletter #376:

- Continued discussion of block template sharing
- B-SSL a Secure Bitcoin Signing Layer
- Bitcoin Core 30.0
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/21/

Fountain:
https://fountain.fm/episode/uYvjTVDINCV7N95sriNu

Spotify:
https://open.spotify.com/episode/2aZv1l0GhSlUSoerkK0rgs

Apple Podcasts:
https://podcasts.apple.com/us/podcast/bitcoin-optech-newsletter-376-recap/id1674626983?i=1000733913844

Sindura Saraswathi, ZmnSCPxj and Eugene Siegel joined Optech to ...

2025-10-17T14:25:56Z

Sindura Saraswathi, ZmnSCPxj and Eugene Siegel joined Optech to discuss Newsletter #375:

- Optimal Threshold Signatures
- Flattening certain nested threshold signatures
- Theoretical limitations on embedding data in the UTXO set
- The ‘Compact block harness’ Bitcoin Core PR Review Club
- And more

You can listen on our website:
https://bitcoinops.org/en/podcast/2025/10/14/

Fountain:
https://fountain.fm/episode/chMU3zQSD9f2tyCuzW4P

Spotify:
https://open.spotify.com/episode/2PykH77AZa2zugekSKsTPb

Bitcoin Optech newsletter #376 is here: - shares an update on the ...

2025-10-17T11:26:28Z

Bitcoin Optech newsletter #376 is here:

- shares an update on the proposal for nodes to share their current block template
- summarizes a paper outlining a covenant-less vault construction
- Bitcoin Core 30.0 release
- Optech Newsletter #376 Podcast
https://bitcoinops.org/en/newsletters/2025/10/17/

Discussion continued around the proposal for full node peers to occasionally send each other their current template for the next block using compact block relay encoding...
https://bitcoinops.org/en/newsletters/2025/10/17/#continued-discussion-of-block-template-sharing

Francesco Madonna posted to Delving Bitcoin about a concept which is a covenant-less vault model using taproot, OP_CHECKSEQUENCEVERIFY, and OP_CHECKLOCKTIMEVERIFY...
https://bitcoinops.org/en/newsletters/2025/10/17/#b-ssl-a-secure-bitcoin-signing-layer

Bitcoin Core 30.0 is the latest version release of the network’s predominant full node. Its release notes describe several significant improvements...
https://bitcoinops.org/en/newsletters/2025/10/17/#bitcoin-core-30-0

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!
https://riverside.fm/studio/bitcoin-optech

Bitcoin Optech newsletter #375 is here: - describes research into ...

2025-10-10T13:49:38Z

Bitcoin Optech newsletter #375 is here:

- describes research into tradeoffs between usability and security in threshold signatures
- summarizes an approach to convert nested threshold signatures into a single-layer signing group
- examines the extent to which data could be embedded in the UTXO set under a restrictive set of rules
- recaps the "Compact block harness" PR Review Meeting
- Optech Newsletter #375 Podcast
https://bitcoinops.org/en/newsletters/2025/10/10/

Sindura Saraswathi posted research, co-authored by her and Korok Ray, to Delving Bitcoin about determining the optimal threshold for a multisignature scheme...
https://bitcoinops.org/en/newsletters/2025/10/10/#optimal-threshold-signatures

ZmnSCPxj posted to Delving Bitcoin to describe how to avoid using nested schnorr signatures in some cases that have not been proven safe...
https://bitcoinops.org/en/newsletters/2025/10/10/#flattening-certain-nested-threshold-signatures

Adam “Waxwing” Gibson started a discussion on the mailing list about the extent to which data could be embedded in the UTXO set under a restrictive set of rules for Bitcoin transactions...
https://bitcoinops.org/en/newsletters/2025/10/10/#theoretical-limitations-on-embedding-data-in-the-utxo-set

'Compact block harness' is a PR by Crypt-iQ that increases the fuzz test coverage by adding a test harness for the compact block relay logic...
https://bitcoinops.org/en/newsletters/2025/10/10/#bitcoin-core-pr-review-club

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!
https://riverside.fm/studio/bitcoin-optech