Bitcoin Optech - Nostr Hypermedia

Bitcoin Optech

_@bitcoinops.org

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

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #301 is here: - describes an idea for securing transactions with lamport signatures without requiring any consensus changes - recaps the "Index TxOrphanage by wtxid, allow entries with same txid" PR Review Meeting - Optech Newsletter #301 Recap on Twitter Spaces

Bitcoin Optech Newsletter #301

This week’s newsletter describes an idea for securing transactions with lamport signatures without requiring any consensus changes. Also included...

Ethan Heilman posted to the Bitcoin-Dev mailing list a method for requiring that a transaction be signed by a lamport signature in order to be valid...

Bitcoin Optech Newsletter #301

This week’s newsletter describes an idea for securing transactions with lamport signatures without requiring any consensus changes. Also included...

Index TxOrphanage by wtxid, allow entries with same txid is a PR by Gloria Zhao that allows multiple transactions with the same txid to exist in TxOrphanage at the same time by indexing them on wtxid instead of txid...

Bitcoin Optech Newsletter #301

This week’s newsletter describes an idea for securing transactions with lamport signatures without requiring any consensus changes. Also included...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Ethan Heilman and Gloria Zhao on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1RDGllvgewVGL

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #300 is here: - summarizes a CTV-like proposal that uses commitments embedded in public keys - examines the analysis of a contract protocol with Alloy - announces the arrests of Bitcoin developers - links to summaries of a CoreDev.tech developer meetup - Optech Newsletter #300 Recap on Twitter Spaces

Bitcoin Optech Newsletter #300

This week’s newsletter summarizes a CTV-like proposal that uses commitments embedded in public keys, examines the analysis of a contract protocol...

Tadge Dryja posted to Delving Bitcoin a proposal for a slightly more efficient version of the core idea of OP_CHECKTEMPLATEVERIFY (CTV)...

Bitcoin Optech Newsletter #300

This week’s newsletter summarizes a CTV-like proposal that uses commitments embedded in public keys, examines the analysis of a contract protocol...

Dmitry Petukhov posted to Delving Bitcoin a specification he had created using the Alloy specification language for the simple OP_CAT-based vault. Petukhov used Alloy to find several useful modifications and to highlight important constraints that any potential implementors should observe...

Bitcoin Optech Newsletter #300

This week’s newsletter summarizes a CTV-like proposal that uses commitments embedded in public keys, examines the analysis of a contract protocol...

As widely reported elsewhere, two developers of the Samourai privacy-enhanced Bitcoin wallet were arrested last week in relation to their software, based on charges by U.S. law enforcement...

Bitcoin Optech Newsletter #300

This week’s newsletter summarizes a CTV-like proposal that uses commitments embedded in public keys, examines the analysis of a contract protocol...

Many Bitcoin Core contributors met in person for a periodic CoreDev.tech event last month in Berlin. Transcripts for some of the sessions from the event have been provided by attendees...

Bitcoin Optech Newsletter #300

This week’s newsletter summarizes a CTV-like proposal that uses commitments embedded in public keys, examines the analysis of a contract protocol...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Tadge Dryja on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1LyxBnyAnnjxN

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #299 is here: - newsletter describes a proposal to relay weak blocks to improve compact block performance in a network with multiple divergent mempool policies - announces the addition of five BIP editors - summarizes popular Q&A from Stack Exchange - Optech Newsletter #299 Recap on Twitter Spaces

Bitcoin Optech Newsletter #299

This week’s newsletter describes a proposal to relay weak blocks to improve compact block performance in a network with multiple divergent mempoo...

Greg Sanders posted to Delving Bitcoin about using weak blocks to improve compact block relay, particularly in the presence of divergent policies for transaction relay and mining. A weak block is a block with insufficient proof-of-work (PoW) to become the next block on the blockchain but which otherwise has a valid structure and set of valid transactions...

Bitcoin Optech Newsletter #299

This week’s newsletter describes a proposal to relay weak blocks to improve compact block performance in a network with multiple divergent mempoo...

After public discussion, the following contributors have been made BIP editors: Bryan “Kanzure” Bishop, Jon Atack, Mark “Murch” Erhardt, Olaoluwa “Roasbeef” Osuntokun, and Ruben Somsen.

Bitcoin Optech Newsletter #299

This week’s newsletter describes a proposal to relay weak blocks to improve compact block performance in a network with multiple divergent mempoo...

Selected Q&A from Bitcoin Stack Exchange: - Where exactly is the “off-by-one” difficulty bug? - How is P2TR different than P2PKH using opcodes from a developer perspective? - Are replacement transactions larger in size than their predecessors and than non-RBF transactions? - Are Bitcoin signatures still vulnerable to nonce reuse? - How do miners manually add transactions to a block template?

Bitcoin Optech Newsletter #299

This week’s newsletter describes a proposal to relay weak blocks to improve compact block performance in a network with multiple divergent mempoo...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Gregory Sanders on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1nAKEaQWybkKL

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #298 is here: - summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in 2023 - Bitcoin Core 27.0 release - summarizes changes to services/client software - Optech Newsletter #298 Recap on Twitter Spaces

Bitcoin Optech Newsletter #298

This week’s newsletter summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in...

Suhas Daftuar posted to Delving Bitcoin that he recorded every transaction his node received in 2023 and has now run them through a development version of Bitcoin Core with cluster mempool enabled to quantify differences between the existing version and the development version...

Bitcoin Optech Newsletter #298

This week’s newsletter summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in...

Changes to services and client software: - Phoenix for server announced - Mercury Layer adds Lightning swaps - Stratum V2 Reference Implementation v1.0.0 released - Teleport Transactions update - Bitcoin Keeper v1.2.1 released - BIP-329 label management software - Key agent Sigbash launches

Bitcoin Optech Newsletter #298

This week’s newsletter summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in...

Bitcoin Core 27.0 is the release of the next major version of the network’s predominant full node implementation...

Bitcoin Optech Newsletter #298

This week’s newsletter summarizes an analysis of how a node with cluster mempool behaved when tested with all transactions seen on the network in...

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1OyJAWNAezaKb

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #297 is here: - announces a new domain-specific language for experimenting with contract protocols - summarizes a discussion about modifying BIP editor responsibilities - describes proposals to reset and modify testnet - recaps the "Implement 64 bit arithmetic op codes in the Script interpreter" PR Review Meeting - Optech Newsletter #297 Recap on Twitter Spaces

Bitcoin Optech Newsletter #297

This week’s newsletter announces a new domain-specific language for experimenting with contract protocols, summarizes a discussion about modifyin...

Kulpreet Singh posted to Delving Bitcoin about a domain-specific language (DSL) he’s working on for Bitcoin. The language makes it easy to specify the operations that should be performed as part of a contract protocol...

Bitcoin Optech Newsletter #297

This week’s newsletter announces a new domain-specific language for experimenting with contract protocols, summarizes a discussion about modifyin...

Tim Ruffing posted to the Bitcoin-Dev mailing list about updating BIP2, which specifies the current process for adding new BIPs and updating existing BIPs...

Bitcoin Optech Newsletter #297

This week’s newsletter announces a new domain-specific language for experimenting with contract protocols, summarizes a discussion about modifyin...

Jameson Lopp posted to the Bitcoin-Dev mailing list about problems with the current public Bitcoin testnet (testnet3) and suggested restarting it, potentially with a different set of special-case consensus rules...

Bitcoin Optech Newsletter #297

This week’s newsletter announces a new domain-specific language for experimenting with contract protocols, summarizes a discussion about modifyin...

'Implement 64 bit arithmetic op codes in the Script interpreter' is a PR by Chris Stewart (GitHub Christewart) that introduces new opcodes allowing users to perform arithmetic operations on larger (64-bit) operands in Bitcoin Script than is currently allowed (32-bit)...

Bitcoin Optech Newsletter #297

This week’s newsletter announces a new domain-specific language for experimenting with contract protocols, summarizes a discussion about modifyin...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Kulpreet Singh, Jameson Lopp, and Joost Jager on Twitter Spaces Thursday at 16:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1YpKkwWomVMKj

Bitcoin Optech 2 years ago

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

Bitcoin Optech Newsletter #296

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

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

Bitcoin Optech Newsletter #296

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

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

Bitcoin Optech Newsletter #296

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

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

Accidental confiscation

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

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

Duplicate transactions

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

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

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

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

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

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Antoine Poinsot on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1vOxwjOPWrdJB?s=20

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #295 is here: - announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes - describes several improvements to the idea for transaction fee sponsorship - summarizes a discussion about using live mempool data to improve Bitcoin Core’s feerate estimation - summarizes popular Q&A from Stack Exchange - Bitcoin Core 27.0rc1 testing guide - adds a free relay topic - Optech Newsletter #295 Recap on Twitter Spaces

Bitcoin Optech Newsletter #295

This week’s newsletter announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes, describes several improve...

A bandwidth-wasting attack was described to the Bitcoin-Dev mailing list. In short, Mallory broadcasts one version of a transaction to Alice and a different version of the transaction to Bob...

Bitcoin Optech Newsletter #295

This week’s newsletter announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes, describes several improve...

Martin Habovštiak posted to the Bitcoin-Dev mailing list an idea for allowing one transaction to boost the priority of an unrelated transaction...

Bitcoin Optech Newsletter #295

This week’s newsletter announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes, describes several improve...

Abubakar Sadiq Ismail posted to Delving Bitcoin about improving Bitcoin Core’s feerate estimation using data from a node’s local mempool...

Bitcoin Optech Newsletter #295

This week’s newsletter announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes, describes several improve...

Selected Q&A from Bitcoin Stack Exchange: - What are the risks of running a pre-SegWit node (0.12.1)? - When is OP_RETURN cheaper than OP_FALSE OP_IF? - Why does BIP-340 use secp256k1? - What criteria does Bitcoin Core use to create block templates? - How does the initialblockdownload field in the getblockchaininfo RPC work?

Bitcoin Optech Newsletter #295

This week’s newsletter announces the disclosure of a bandwidth-wasting attack affecting Bitcoin Core and related nodes, describes several improve...

Bitcoin Core 27.0rc1 has a brief overview to suggested testing topics and a scheduled meeting of the Bitcoin Core PR Review Club dedicated to testing today (March 27th) at 15:00 UTC.

Bitcoin Core PR Review Club

Testing Bitcoin Core 27.0 Release Candidates

https://github.com/bitcoin-core/bitcoin-devwiki/wiki/27.0-Release-Candidate-Testing-Guide Free relay was a policy on early Bitcoin full nodes to allow some unconfirmed transactions to be relayed even if they didn’t pay transaction fees. That policy allowed an attacker to waste the bandwidth of full nodes without paying any cost, so modern full nodes generally try to forbid operations which don’t allow miners to claim fees that are proportionate to the amount of relay bandwidth used...

Free relay was a policy on early Bitcoin full nodes to allow some unconfirmed transactions to be relayed even if they didn’t pay transaction fees...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Dave Harding, Peter Todd, Abubakar Sadiq Ismail, David Gumberg, and Jeffrey Czyz on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1ZkKzjyQPNRKv

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #294 is here: - announces a project to create a BIP324 proxy for light clients - summarizes discussion about a proposed BTC Lisp language - summarizes changes to services/client software - adds a Kindred replace by fee topic - Optech #294 Recap

Bitcoin Optech Newsletter #294

This week’s newsletter announces a project to create a BIP324 proxy for light clients and summarizes discussion about a proposed BTC Lisp languag...

Sebastian Falbesoner posted to Delving Bitcoin to announce a TCP proxy for translating between the version 1 (v1) Bitcoin P2P protocol and the v2 protocol defined in BIP324. This is especially intended to allow light client wallets written for v1 to take advantage of v2’s traffic encryption...

Bitcoin Optech Newsletter #294

This week’s newsletter announces a project to create a BIP324 proxy for light clients and summarizes discussion about a proposed BTC Lisp languag...

Anthony Towns posted to Delving Bitcoin about his experiments over the past couple of years creating a variant of the Lisp language for Bitcoin, called BTC Lisp. See Newsletters #293 and #191 for previous discussions...

Bitcoin Optech Newsletter #294

This week’s newsletter announces a project to create a BIP324 proxy for light clients and summarizes discussion about a proposed BTC Lisp languag...

Changes to services and client software: - BitGo adds RBF support - Phoenix Wallet v2.2.0 released - Bitkey hardware signing device released - Envoy v1.6.0 released - VLS v0.11.0 released - Portal hardware signing device announced - Braiins mining pool adds Lightning support - Ledger Bitcoin App 2.2.0 released

Bitcoin Optech Newsletter #294

This week’s newsletter announces a project to create a BIP324 proxy for light clients and summarizes discussion about a proposed BTC Lisp languag...

Kindred replace by fee is the ability for a transaction to replace a related transaction in the mempool even if there’s no conflict between the two transactions...

Kindred replace by fee

Kindred replace by fee is the ability for a transaction to replace a related transaction in the mempool even if there’s no conflict between the t...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Sebastian Falbesoner, Anthony Towns, and Russell O’Connor on Twitter Spaces Thursday at 14:30 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1ZkKzjEzkjyKv

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #293 is here: - summarizes a post about trustless onchain betting for potential soft forks - links to a detailed overview of Chia Lisp for Bitcoiners - recaps the "Re enable OP_CAT" PR Review Meeting - Core Lightning v24.02.1, Bitcoin Core 26.1rc1, Bitcoin Core 27.0rc1 release candidates

Bitcoin Optech Newsletter #293

This week’s newsletter summarizes a post about trustless onchain betting for potential soft forks and links to a detailed overview of Chia Lisp f...

ZmnSCPxj posted to Delving Bitcoin a protocol for giving control over a UTXO to a party that correctly predicts whether or not a particular soft fork will activate...

Bitcoin Optech Newsletter #293

This week’s newsletter summarizes a post about trustless onchain betting for potential soft forks and links to a detailed overview of Chia Lisp f...

Anthony Towns posted to Delving Bitcoin a detailed overview of the Lisp variant used by the Chia cryptocurrency...

Bitcoin Optech Newsletter #293

This week’s newsletter summarizes a post about trustless onchain betting for potential soft forks and links to a detailed overview of Chia Lisp f...

'Re enable OP_CAT' is a PR by Armin Sabouri (GitHub 0xBEEFCAF3) that reintroduces the OP_CAT opcode but only on signet Bitcoin Inquisition and only for tapscript (taproot script)...

Bitcoin Optech Newsletter #293

This week’s newsletter summarizes a post about trustless onchain betting for potential soft forks and links to a detailed overview of Chia Lisp f...

Bitcoin Core 27.0rc1 is a release candidate for the next major version of the network’s predominant full node implementation.

Bitcoin Optech Newsletter #293

This week’s newsletter summarizes a post about trustless onchain betting for potential soft forks and links to a detailed overview of Chia Lisp f...

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Thursday at 14:00 UTC (new time!). Join us to discuss or ask questions! https://twitter.com/i/spaces/1ynKOyNnAprJR

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #292 is here: - summarizes a discussion about updating the specification for BIP21 bitcoin: URIs - describes a proposal to manage multiple concurrent MuSig2 signing sessions with a minimum of state - links to a thread about adding editors for the BIPs repository - discusses a set of tools that allow quickly porting the Bitcoin Core GitHub project to a self-hosted GitLab project - Optech Newsletter #292 Recap on Twitter Spaces

Bitcoin Optech Newsletter #292

This week’s newsletter summarizes a discussion about updating the specification for BIP21 bitcoin: URIs, describes a proposal to manage multiple ...

Josie Baker posted to Delving Bitcoin to discuss how BIP21 URIs are specified to be used, how they’re used today, and how they can be used in the future...

Bitcoin Optech Newsletter #292

This week’s newsletter summarizes a discussion about updating the specification for BIP21 bitcoin: URIs, describes a proposal to manage multiple ...

Salvatore Ingala posted to Delving Bitcoin about minimizing the amount of state needed to perform multiple MuSig2 signing sessions in parallel...

Bitcoin Optech Newsletter #292

This week’s newsletter summarizes a discussion about updating the specification for BIP21 bitcoin: URIs, describes a proposal to manage multiple ...

Ava Chow posted to the Bitcoin-Dev mailing list to suggest the addition of BIP editors to help the current editor...

Bitcoin Optech Newsletter #292

This week’s newsletter summarizes a discussion about updating the specification for BIP21 bitcoin: URIs, describes a proposal to manage multiple ...

Fabian Jahr posted to Delving Bitcoin about maintaining a backup of the Bitcoin Core project’s GitHub account on a self-hosted GitLab instance. In case the project ever needed to leave GitHub suddenly, this would make all existing issues and pull requests accessible on GitLab within a short amount of time, allowing work to continue with only a brief interruption...

Bitcoin Optech Newsletter #292

This week’s newsletter summarizes a discussion about updating the specification for BIP21 bitcoin: URIs, describes a proposal to manage multiple ...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Josie Baker, Salvatore Ingala, and Fabian Jahr on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1mnxepjZboAJX

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #291 is here: - describes a proposed contract for trustless miner feerate futures, - links to a coin selection algorithm for LN nodes providing dual funding liquidity - details a prototype for a vault using OP_CAT - discusses sending and receiving ecash using LN and ZKCPs - summarizes popular Q&A from Stack Exchange - adds an Ecash topic - Optech Newsletter #291 Recap on Twitter Spaces

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

ZmnSCPxj posted to Delving Bitcoin a set of scripts that will allow two parties to conditionally pay each other based on the marginal feerate to include a transaction in a future block...

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

Richard Myers posted to Delving Bitcoin about creating a coin selection algorithm that is optimized for LN nodes offering liquidity via liquidity advertisements...

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

Developer Rijndael posted to Delving Bitcoin about a Rust-language proof-of-concept implementation he’s written for a vault that only depends on the current consensus rules plus the proposed OP_CAT opcode...

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

Anthony Towns posted to Delving Bitcoin about linking “ecash mints to the lightning network without losing ecash’s anonymity or adding any additional trust”...

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

Selected Q&A from Bitcoin Stack Exchange: - Why can’t nodes have the relay option to disallow certain transaction types? - What is the circular dependency in signing a chain of unconfirmed transactions? - How does Ocean’s TIDES payout scheme work? - What data does the Bitcoin Core wallet search for during a blockchain rescan? - How does transaction rebroadcasting for watch-only wallets work?

Bitcoin Optech Newsletter #291

This week’s newsletter describes a proposed contract for trustless miner feerate futures, links to a coin selection algorithm for LN nodes provid...

Ecash is a type of centralized digital currency that uses blind signatures to prevent the centralized controlling party (the mint) from knowing the balance of any particular user or from learning which users were involved in any transactions...

Ecash is a type of centralized digital currency that uses blind signatures to prevent the centralized controlling party (the mint) from knowing the...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Richard Myers and Rijndael on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1RDGllLMreoGL

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #290 is here: - describes a proposal for providing DNS-based human-readable Bitcoin payment instructions - summarizes a post with thoughts about mempool incentive compatibility - links to a thread discussing the design of Cashu and other ecash systems - looks at continuing discussion about 64-bit arithmetic - gives an overview of an improved reproducible ASMap creation process - summarizes changes to services/client software - Optech #290 Recap

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Following previous discussions, Matt Corallo posted to Delving Bitcoin a draft BIP that will allow a string like example@example.com to resolve to DNS address such as example.user._bitcoin-payment.example.com...

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Suhas Daftuar posted to Delving Bitcoin several insights into the criteria full nodes can use to select which transactions to accept into their mempools, relay to other nodes, and mine for maximal revenue...

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Several weeks ago, developer Thunderbiscuit posted to Delving Bitcoin a description of the blind signature scheme behind the Chaumian ecash system used in Cashu, which denominates balances in satoshis and allows sending and receiving money using Bitcoin and LN...

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Several developers have continued discussing a potential future soft fork that could add 64-bit arithmetic operations to Bitcoin. This week, Chris Stewart created a new discussion thread for a draft BIP for an opcode originally proposed as part of OP_TAPLEAF_UPDATE_VERIFY, OP_INOUT_AMOUNT...

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Fabian Jahr posted to Delving Bitcoin about advancements in creating a map of autonomous systems (ASMap) that each control the routing for large parts of the internet...

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Changes to services and client software: - Multiparty coordination protocol NWC announced - Mutiny Wallet v0.5.7 released - GroupHug transaction batching service - Boltz announces taproot swaps

Bitcoin Optech Newsletter #290

This week’s newsletter describes a proposal for providing DNS-based human-readable Bitcoin payment instructions, summarizes a post with thoughts ...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests callebtc, Chris Stewart, and Fabian Jahr on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1kvJpvpWjwwKE

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #289 is here: - summarizes ideas for relay enhancements after cluster mempool is deployed - describes research into the topologies and sizes of LN-style anchor outputs in 2023 - announces a new host for the Bitcoin-Dev mailing list - encourages readers to celebrate I Love Free Software Day by thanking free software contributors - recaps the "Add maxfeerate and maxburnamount args to submitpackage" PR Review Meeting - Newsletter #289 Recap

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

Gregory Sanders posted to Delving Bitcoin several ideas for allowing individual transactions to opt-in to certain mempool policies after cluster mempool support has been fully implemented, tested, and deployed...

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

Suhas Daftuar posted to Delving Bitcoin about his research into the idea of automatically applying v3 transaction relay policy to anchors-style LN commitment and fee-bumping transactions...

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

The Bitcoin protocol development discussion mailing list is now hosted on a new server with a new email address. Everyone who wishes to continue receiving posts needs to resubscribe...

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

Every year on February 14th, organizations such as FSF and FSFE encourage users of free and open source software (FOSS) to “reach out and say ‘Thank you!’ to all the people maintaining and contributing to Free Software”...

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

'Add maxfeerate and maxburnamount args to submitpackage' is a PR by Greg Sanders (GitHub instagibbs) that adds functionality to the submitpackage RPC that is already present in the single-transaction RPCs sendrawtransaction and testmempoolaccept...

Bitcoin Optech Newsletter #289

This week’s newsletter summarizes ideas for relay enhancements after cluster mempool is deployed, describes results of research into the topologi...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Gregory Sanders on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1DXxyjlmXrbKM

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #288 is here: - announces the disclosure of a block stalling bug in Bitcoin Core affecting LN - relays a concern about how to securely open new zero-conf channels with version 3 relay - describes a contract protocol rule when allowing an external party to contribute an input to a tx - summarizes discussions about a proposal for new tx replacement rules to avoid pinning - provides a brief update on the mailing list - #288 Recap on Twitter Spaces

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

Eugene Siegel announced to Delving Bitcoin a bug in Bitcoin Core he had responsibly disclosed almost three years ago. Bitcoin Core 22 and higher contain fixes for the bug, but many people are still running affected versions...

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

Matt Corallo posted to Delving Bitcoin to discuss how to securely allow zero-conf channel opening when the proposed v3 transaction relay policy is being used...

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

Bastien Teinturier posted to Delving Bitcoin to describe an easy-to-overlook requirement for protocols where a third party contributes an input to a transaction whose txid must not change after a different user contributes a signature to the transaction...

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

Peter Todd posted to the Bitcoin-Dev mailing list a proposal for a set of transaction replacement policies that can be used even when existing replace-by-fee (RBF) policies won’t allow a transaction to be replaced...

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

As of this writing, the Bitcoin-Dev mailing list is no longer accepting new emails as part of the process of migrating it to a different list server. Optech will provide an update when the migration is complete.

Bitcoin Optech Newsletter #288

This week’s newsletter announces the public disclosure of a block stalling bug in Bitcoin Core affecting LN, relays a concern about how to secure...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Bastien Teinturier on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1OyKAWlAaewJb

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #287 is here: - describes a proposal to allow replacement of v3 transactions using RBF rules to ease the transition to cluster mempool - summarizes an argument against OP_CHECKTEMPLATEVERIFY based on it commonly requiring exogenous fees - summarizes popular Q&A from Stack Exchange - adds a Fee sourcing topic - adds a Simple taproot channels topic - Optech Newsletter #287 Recap on Twitter Spaces

Bitcoin Optech Newsletter #287

This week’s newsletter describes a proposal to allow replacement of v3 transactions using RBF rules to ease the transition to cluster mempool and...

Gloria Zhao posted to Delving Bitcoin about allowing a transaction to replace a related transaction in the mempool even if there’s no conflict between the two transactions...

Bitcoin Optech Newsletter #287

This week’s newsletter describes a proposal to allow replacement of v3 transactions using RBF rules to ease the transition to cluster mempool and...

Peter Todd posted to the Bitcoin-Dev mailing list an adaptation of his argument against exogenous fees (see Newsletter #284) applied to the OP_CHECKTEMPLATEVERIFY proposal...

Bitcoin Optech Newsletter #287

This week’s newsletter describes a proposal to allow replacement of v3 transactions using RBF rules to ease the transition to cluster mempool and...

Selected Q&A from Bitcoin Stack Exchange: - How does block synchronization work in Bitcoin Core today? - How does headers-first prevent disk-fill attack? - Is BIP324 v2transport redundant on Tor and I2P connections? - What’s a rule of thumb for setting the maximum number of connections? - Why isn’t the upper bound (+2h) on the block timestamp set as a consensus rule? - Sigop count and its influence on transaction selection?

Bitcoin Optech Newsletter #287

This week’s newsletter describes a proposal to allow replacement of v3 transactions using RBF rules to ease the transition to cluster mempool and...

Fee sourcing refers to the decisions made by designers of committed transactions (such as presigned transactions) about what sources of funds they’ll use for paying transaction fees...

Fee sourcing refers to the decisions made by designers of committed transactions (such as presigned transactions) about what sources of funds they�...

Simple taproot channels are LND funding and commitment transactions that use taproot (P2TR) with support for MuSig2 scriptless multisignature signing when both parties are cooperating...

Simple taproot channels

Simple taproot channels are LND funding and commitment transactions that use taproot (P2TR) with support for MuSig2 scriptless multisignature signi...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Gloria Zhao and Brandon Black on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1lPJqblBqMexb

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #285 is here: - discloses a past vulnerability affecting Core Lightning - announces two new soft fork proposals - provides an overview of the cluster mempool proposal - relays information about an updated specification and implementation of transaction compression - summarizes a discussion about Miner Extractable Value (MEV) in non-zero ephemeral anchors - adds an Ark topic - Optech Newsletter #285 Recap on Twitter Spaces

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Matt Morehouse used Delving Bitcoin to announce a vulnerability he had previously responsibly disclosed that affected Core Lightning versions 23.02 through 23.05.2...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Brandon Black posted to Delving Bitcoin details about a soft fork that combines previous proposals for OP_CHECKTEMPLATEVERIFY (CTV) and OP_CHECKSIGFROMSTACK (CSFS) with a new proposal for an OP_INTERNALKEY that places the taproot internal key on the stack...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Chris Stewart posted a draft BIP to Delving Bitcoin for enabling 64-bit arithmetic operations on Bitcoin in a future soft fork. Bitcoin currently only allows 32-bit operations...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Suhas Daftuar posted a summary of the cluster mempool proposal to Delving Bitcoin. Optech attempted to summarize the current state of cluster mempool discussion in Newsletter #280 but we would strongly recommend reading the overview by Daftuar, who is one of the architects of the proposal...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Tom Briar posted to the Bitcoin-Dev mailing list an updated draft specification and proposed implementation of compressed Bitcoin transactions...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Gregory Sanders posted to Delving Bitcoin to discuss concerns about ephemeral anchor outputs that contain more than 0 satoshis...

Bitcoin Optech Newsletter #285

This week’s newsletter discloses a past vulnerability affecting Core Lightning, announces two new soft fork proposals, provides an overview of th...

Ark is a trustless joinpool-style protocol where a large number of users share a UTXO by accepting a counterparty as a co-signer on all transactions within a certain time period. This spreads the cost of onchain fees from using that UTXO across many users, minimizing their individual costs...

In the Ark protocol, a large number of users trustlessly share onchain UTXOs using trees of pre-signed, offchain transactions. By sharing UTXOs and...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Brandon Black, Chris Stewart, and Gregory Sanders on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1ypKdkjOkoYxW

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #284 is here: - summarizes discussion about LN anchors and elements of the v3 transaction relay proposal - announces a research implementation of LN-Symmetry - recaps the "Nuke adjusted time (attempt 2)" PR Review Meeting - adds an Out-of-band fees topic - Optech Newsletter #284 Recap on Twitter Spaces

Bitcoin Optech Newsletter #284

This week’s newsletter summarizes discussion about LN anchors and elements of the v3 transaction relay proposal and announces a research implemen...

Antoine Poinsot posted to Delving Bitcoin to foster discussion about the proposals for v3 transaction relay policy and ephemeral anchors. We’ve divided the discussion into several parts...

Bitcoin Optech Newsletter #284

This week’s newsletter summarizes discussion about LN anchors and elements of the v3 transaction relay proposal and announces a research implemen...

Gregory Sanders posted to Delving Bitcoin about a proof-of-concept implementation he made of the LN-Symmetry protocol (originally called eltoo) using a software fork of Core Lightning...

Bitcoin Optech Newsletter #284

This week’s newsletter summarizes discussion about LN anchors and elements of the v3 transaction relay proposal and announces a research implemen...

Nuke adjusted time (attempt 2) is a PR by Niklas Gögge that modifies a block validity check related to the block’s timestamp...

Bitcoin Optech Newsletter #284

This week’s newsletter summarizes discussion about LN anchors and elements of the v3 transaction relay proposal and announces a research implemen...

Out-of-band fees are payments made directly to a specific miner (or group of miners) in exchange for confirming one or more transactions. They can be contrasted with standard in-band fees that are paid using the fee implied by the difference in a transaction’s input and output value...

Out-of-band fees

Out-of-band fees are payments made directly to a specific miner (or group of miners) in exchange for confirming one or more transactions. They can ...

Bitcoin Optech will host an audio recap discussion of this newsletter on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1mnxepPqnmQJX

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #283 is here: - shares the disclosure of past vulnerabilities in LND - summarizes a proposal for fee-dependent timelocks - describes an idea for improving fee estimation using transaction clusters - discusses how to specify unspendable keys in descriptors - examines the cost of pinning in the v3 transaction relay proposal - mentions a proposed BIP to allow descriptors to be included in PSBTs - announces a tool that can be used with the MATT proposal to prove a program executed correctly - looks at a proposal for allowing highly efficient group exits from a pooled UTXO - points to new coin selection strategies being proposed for Bitcoin Core - Optech Newsletter #283 Recap on Twitter Spaces

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Niklas Gögge posted to Delving Bitcoin about two vulnerabilities he had previously responsibly disclosed, which led to fixed versions of LND being released...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

John Law posted to the Bitcoin-Dev and Lightning-Dev mailing lists with a rough proposal for a soft fork that could allow transaction timelocks to optionally only unlock (expire) when median block feerates are below a user-chosen level...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Abubakar Sadiq Ismail posted to Delving Bitcoin about using some of the tools and insights from the design of cluster mempool to improve fee estimation in Bitcoin Core...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Salvatore Ingala started a discussion on Delving Bitcoin about how to allow descriptors, particularly those for taproot, to specify a key for which no private key is known (preventing spending from that key)...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Peter Todd posted to the Bitcoin-Dev mailing list an analysis of the proposed v3 transaction relay policy on transaction pinning for contract protocols such as LN...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

The SeedHammer team posted a draft BIP to the Bitcoin-Dev mailing list for including descriptors in PSBTs. The main intended use seems to be encapsulating descriptors in the PSBT format for transfer between wallets, as the proposed standard allows PSBTs to omit transaction data when a descriptor is enclosed...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Johan Torås Halseth posted to Delving Bitcoin about elftrace, a proof of concept program that can use the OP_CHECKCONTRACTVERIFY opcode from the MATT soft fork proposal to allow a party in a contract protocol to claim money if an arbitrary program executed successfully...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Salvatore Ingala posted to Delving Bitcoin a proposal that can improve multiparty contracts where several users share a UTXO, such as a joinpool or channel factory, and some of the users want to exit the contract at a time when other users are unresponsive (whether unintentionally or deliberately)...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Mark Erhardt posted to Delving Bitcoin about edge-cases users may have experienced with Bitcoin Core’s coin selection strategy and proposes two new strategies that address the edge cases by attempting to reduce the number of inputs used in wallet transactions at high feerates...

Bitcoin Optech Newsletter #283

This week’s newsletter shares the disclosure of past vulnerabilities in LND, summarizes a proposal for fee-dependent timelocks, describes an idea...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Niklas Gögge, Antoine Riard, Abubakar Sadiq Ismail, Salvatore Ingala, and Gloria Zhao on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1YqKDgrwgONxV

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #282: 2023 Year-in-Review Special is here: - notes Bitcoin developments during each month of 2023 - feature: Soft fork proposals - feature: Security disclosures - feature: Major releases of popular infrastructure projects - feature: Bitcoin Optech

Bitcoin Optech Newsletter #282: 2023 Year-in-Review Special

This special edition of the Optech Newsletter summarizes notable developments in Bitcoin during all of 2023.

This year saw much discussion and many proposals around potential soft forks...

Bitcoin Optech Newsletter #282: 2023 Year-in-Review Special

This special edition of the Optech Newsletter summarizes notable developments in Bitcoin during all of 2023.

Optech reported on three significant security vulnerabilities this year...

Bitcoin Optech Newsletter #282: 2023 Year-in-Review Special

This special edition of the Optech Newsletter summarizes notable developments in Bitcoin during all of 2023.

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

Bitcoin Optech Newsletter #282: 2023 Year-in-Review Special

This special edition of the Optech Newsletter summarizes notable developments in Bitcoin during all of 2023.

In Optech’s sixth year, we published 51 weekly newsletters, published a 10-part series about mempool policy, and added 15 new pages to our topics index. Optech published over 86,000 English words about Bitcoin research and development this year, the equivalent of a 250-page book. Every newsletter this year was accompanied by a podcast episode, totaling over 50 hours in audio form and 450,000 words in transcript form with a total of 62 different guests in 2023...

Bitcoin Optech Newsletter #282: 2023 Year-in-Review Special

This special edition of the Optech Newsletter summarizes notable developments in Bitcoin during all of 2023.

Bitcoin Optech will host an audio recap discussion of this special newsletter with special guest and Optech contributor Dave Harding on Twitter Spaces Thursday at 15:00 UTC. Join us to celebrate, discuss, or ask questions! https://twitter.com/i/spaces/1BRJjPaAMNeKw

Bitcoin Optech 2 years ago

Bitcoin Optech newsletter #281 is here: - summarizes a discussion about griefing liquidity advertisements - summarizes changes to services/client software - summarizes popular Q&A from Stack Exchange - Optech Newsletter #281 Recap on Twitter Spaces

Bitcoin Optech Newsletter #281

This week’s newsletter summarizes a discussion about griefing liquidity advertisements and includes our regular sections describing changes to se...

Bastien Teinturier posted to the Lightning-Dev mailing list about a potential problem with timelocks on dual-funded channels created from liquidity advertisements...

Bitcoin Optech Newsletter #281

This week’s newsletter summarizes a discussion about griefing liquidity advertisements and includes our regular sections describing changes to se...

Changes to services and client software: - Stratum v2 mining pool launches - Bitcoin network simulation tool warnet announced - Payjoin client for Bitcoin Core released - Call for community block arrival timestamps - Envoy 1.4 released - BBQr encoding scheme announced - Zeus v0.8.0 released

Bitcoin Optech Newsletter #281

This week’s newsletter summarizes a discussion about griefing liquidity advertisements and includes our regular sections describing changes to se...

Selected Q&A from Bitcoin Stack Exchange: - What are all the rules related to CPFP fee bumping? - How is the total number of RBF replaced transactions calculated? - What types of RBF exist and which one does Bitcoin Core support and use by default? - What is the Block 1,983,702 Problem? - What are hash functions used for in bitcoin?

Bitcoin Optech Newsletter #281

This week’s newsletter summarizes a discussion about griefing liquidity advertisements and includes our regular sections describing changes to se...

Bitcoin Optech will host an audio recap discussion of this newsletter with special guest Bastien Teinturier on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions! https://twitter.com/i/spaces/1YpJkwPgyBjJj

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