Bitcoin Optech
@bitcoinoptech
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We provide weekly newsletters, workshops, case studies, and research for the #Bitcoin community.
Joined June 2018
Bitcoin Optech newsletter #95 is here:. - summarizes disclosure of issue affecting the safety of routed LN payments.- announces new presigned vault proposal.- popular StackExchange Q&A.- announcements of RCs.- notable code changes in popular Bitcoin repos.
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Bitcoin Optech newsletter #274 is here:. - describes the replacement cycling attack against HTLCs used in LN and other systems, examines deployed mitigations, and summarizes additional mitigation proposals.- notes a bug affecting a Bitcoin Core RPC.
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Bitcoin Optech newsletter #231: 2022 Year-in-Review Special is here:. - notes Bitcoin developments during each month of 2022.- feature: Replace-By-Fee.- feature: Major releases of popular projects.- feature: Bitcoin Optech .- feature: Soft fork proposals.
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Bitcoin Optech newsletter #78 Year-in-Review Special is here:. - summarizes developments in Bitcoin during 2019.- major releases of infrastructure projects.- notable technical conferences / events.- new open source infrastructure.- Bitcoin Optech efforts.
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Over the past 18 months, we've published the equivalent of about 350 printed pages worth of Bitcoin news and documentation. Today, we’re pleased to announce a new index that organizes that content by topic.
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The Bitcoin Optech 2018 Year-in-Review summary is here! We've rounded up the most important technical developments of the year in one newsletter. This newsletter contains lots of graphs and tables, so is best viewed on the website with a larger screen.
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Bitcoin Optech newsletter #129 Year-in-Review Special is here:. - summarizes developments in Bitcoin during 2020.- outlines taproot, tapscript, and schnorr signatures.- notes major releases of infrastructure projects.- reviews Bitcoin Optech efforts.
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We're proud to announce the launch of Bitcoin Optech today. We're here to help Bitcoin businesses integrate scaling technology.
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Announcing the Bitcoin Optech Podcast!. The last few months we've had the pleasure of hosting Twitter Spaces discussions with prominent Bitcoin/Lightning developers & researchers who author the software and mail list posts covered in our newsletters.
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Last month, we held two workshops on the schnorr/taproot proposal. We're releasing all content (videos, slides, transcripts, jupyter notebooks) from those workshops so anyone can learn about the proposals and play with the technology:.
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Bitcoin Optech newsletter #180: 2021 Year-in-Review is here:. - notes developments in Bitcoin during each month of 2021.- featured summary: taproot .- featured summary: major releases of popular infrastructure projects .- featured summary: Bitcoin Optech.
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Bitcoin Optech newsletter #101 is here:. - links to a post/paper about eclipse attacks to steal from LN channels.- describes history of a fee overpayment attack affecting hardware wallets.- summary of Connection eviction logic tests PR Review Club meeting.
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Bitcoin Optech newsletter #69 is here:. - invites participation in a structured taproot proposal review.- highlights updates to two Bitcoin wallets.- requests C-Lightning & Bitcoin Core RC testing.- lists changes to popular Bitcoin infrastructure projects.
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We're excited to launch our Compatibility Matrix!. The site provides documentation of wallets' and services' support for scaling technologies (initially bech32 & RBF). The data will help Bitcoin users make informed decisions about supporting scaling tech.
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Bitcoin Optech newsletter #102 is here:. - summarizes the CoinPool payment pool proposal.- summarizes the WabiSabi coordinated coinjoin protocol.- notable changes to ecosystem services and client software.
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Bitcoin Optech newsletter #136 is here:. - describes a new constant-time algorithm for generating/verifying transaction signatures.- mentions proposal to stop processing unsolicited txs.- summarizes proposed BIP for setting up multisig wallets.- .
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Bitcoin Optech newsletter #282: 2023 Year-in-Review Special is here:. - notes Bitcoin developments during each month of 2023.- feature: Soft forks.- feature: Security disclosures.- feature: Major releases of infrastructure projects.- feature: Optech.
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Happy New Year from Bitcoin Optech! . Here's to another great year of technical developments in Bitcoin and Lightning. We'll be here with newsletters, workshops and other resources to help bitcoin businesses integrate scalable Bitcoin technology.
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Bitcoin Optech newsletter #77 is here:. - LND 0.8.2-beta.- C-Lightning RC testing.- LN multipath payment support.- bech32 error detection.- bip-ctv changes.- LN eclipse attacks.- Bitcoin projects changes.- Client software changes.- Stack Exchange Q&A.
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Bitcoin Optech newsletter #57 is here:. - describes fidelity bonds for JoinMarket-style decentralized coinjoin.- mentions a PR for BIP322 signmessage support (including the ability to sign for bech32 addresses).- summarizes a discussion about bloom filters.
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Bitcoin Optech newsletter #120 is here:. - provides an overview of the new MuSig2 paper.- summarizes additional discussion about upfront fees in LN.- describes a proposal to simplify management of LN payments.- lists notable clients and services updates.
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Bitcoin Optech newsletter #96 is here:. - links to discussion about enhanced QR codes for communicating large txs.- includes a field report from Suredbits about building a high-availability LN node.- summarizes recently transcribed talks and conversations.
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Bitcoin Optech newsletter #61 is here:. - asks for comments on the miniscript language.- publishes our final bech32 sending support section.- includes popular Q&A from the Bitcoin StackExchange.- describes notable changes to popular Bitcoin projects.
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Bitcoin Optech Newsletter #22 is here. This week’s wumbo-sized newsletter provides a note about Bitcoin hash rate related to forks on other coins and summarizes changes for the Lightning Network protocol version 1.1 specification.
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Bitcoin Optech newsletter #185 is here:. - describes an analysis of the proposed OP_CHECKTEMPLATEVERIFY (CTV) opcode’s effect on discreet log contracts.- summarizes a discussion about alternative changes to tapscript to enable CTV and SIGHASH_ANYPREVOUT.
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Bitcoin Optech newsletter #172 is here:. - summarizes popular questions and answers from the Bitcoin Stack Exchange.- continues the 'how to prepare for taproot' series: future consensus changes.- Rust-Lightning 0.0.102, C-Lightning 0.10.2rc1 releases.
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Bitcoin Optech newsletter #79 is here:. - summarizes the final week of the taproot review.- describes a discussion of coinjoin mixing without equal value inputs or outputs.- mentions a proposal to encode output script descriptors in end-user interfaces.
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Bitcoin Optech newsletter #128 is here:. - describes two suggested improvements to LN static backups.- links to a proposal for a new version of PSBTs.- summarizes changes to services/client software.- lists popular Bitcoin StackExchange q&a.
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Earlier today @hrdng & @bitschmidty spoke with Gregory Sanders (@theinstagibbs), Antoine Poinsot (@darosior), & Max Edwards (@max3dwards) about:. - Ephemeral anchors & malleability.- Miniscript adoption.- Bitcoin Core 26.0rc2 testing guide. Catch up here:.
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Bitcoin Optech newsletter #200 is here:. - summarizes discussion of recursive covenants Script changes.- examines a revised OP_TX proposal.- reviews descriptors for hardware signers research.- summarizes client software changes.- celebrates newsletter 200.
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Bitcoin Optech newsletter #97 is here:. - describes proposal that taproot signatures make an additional commitment to spent scriptPubKeys.- summary of a Bitcoin Core PR Review Club meeting.- lists latest releases / RCs.- descriptions of notable commits.
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Bitcoin Optech newsletter #108 is here:. - describes proposal to upgrade LN channel commitment tx formats w/o new channels.- includes a River Financial field report about PSBTs/descriptors.- Q&A.- C-Lightning 0.9.0rc3.- Bitcoin Core 0.20.1rc1.- notable PRs.
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Bitcoin Optech newsletter #90 is here:. - summarizes several questions and answers from the Bitcoin StackExchange.- describes notable changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #171 is here:. - summarizes paying frequently-offline LN nodes thread.- describes proposals for lowering LN payment path probing costs.- creating signet and testnet taproot txs.- describes clients/services changes.- taproot trivia.
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Bitcoin Optech newsletter #91 is here:. - describes proposal to make statechains deployable on Bitcoin w/o consensus changes.- discusses schnorr nonce generation that protects against differential power analysis.- links to updated BIP322 proposal.
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Bitcoin Optech newsletter #30 is out now. Describes a proposed LN feature to allow making spontaneous payments and provides our longest-ever list of notable code changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech Newsletter #9 is out!. Including a request to help test the next version of Bitcoin Core, short descriptions of projects Bitcoin Core contributors are working on, and a list of notable merges during the past week.
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It's been a busy week in Bitcoin. A new c-lightning release, updated S-9 firmware from Bitmain and Braiins, a Lightning residency and hack day in New York, and much more. Too much to take in? Bitcoin Optech Newsletter #19 has you covered:
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Bitcoin Optech newsletter #98 is here:. - relays request for comment on a proposed change to the BIP341 taproot transaction digest.- summarizes discussion about new and more concise protocol for atomic swaps.- describes changes to services/client software.
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Newsletter #5 is out!. This week’s newsletter includes information about a new language to describe output scripts, an update on Bitcoin Core’s support for partially-signed Bitcoin transactions, and news on several other notable Bitcoin Core merges.
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Bitcoin Optech newsletter #72 is here:. - announces a Bitcoin Core security disclosure.- describes new developments related to taproot.- mentions a potential LN payment data format privacy leak .- describes two proposed changes to the LN specification.
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Welcome to the newest Optech member, . @SwanBitcoin . We appreciate your support of our efforts!.
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Bitcoin Optech newsletter #89 is here:. - summarizes an update to a proposed watchtower standard for LN.- includes sections about changes to services and client software.- provides notable updates to popular Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #109 is here:. - describes the new Minsc policy language.- summarizes transcribed talks and conversations.- C-Lightning 0.9.0, Bitcoin Core 0.20.1, LND 0.11.0-beta.rc1.- notable changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #132 is here:. - summarizes Bitcoin-Dev mailing list post about payjoin adoption.- discusses post about making hardware wallets compatible with more advanced Bitcoin features.- reviews changes to services and client software.
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Bitcoin Optech newsletter #85 is here:. - summarizes discussion of taproot vs MAST+schnorr.- describes PoDLEs in LN channels.- highlights privacy-enhanced payments to unannounced LN channels.- announces C-Lightning 0.8.1.- requests Bitcoin Core RC testing.
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Bitcoin Optech newsletter #113 is here:. - describes proposed change to LN commitment transactions.- summarizes discussion of a default signet.- links to proposal for standardizing temporarily trusted LN channels.- recently transcribed talks/conversations.
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Bitcoin Optech Newsletter #43 is here. This week:. - Lightning Labs releases LND 0.6 beta.- Bitcoin Core merges support for a BIP 158 filter index.- Optech highlights some top-voted bech32 Q&As from Bitcoin Stack Exchange.
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Bitcoin Optech newsletter #94 is here:. - links to a prototype for creating vaults using pre-signed transactions.- notes changes to services, client software.- Bitcoin Core, LND, C-Lightning RCs.- notable changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #99 is here:. - summarizes a discussion about the minimum allowed transaction size.- includes popular questions and answers from the Bitcoin StackExchange.- releases and RCs.- notable merges from Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #164 is here:. - describes a tool for decoding and modifying PSBTs .- links to a blog and proof-of-concept implementation of an eltoo-based LN payment channel.- continues the 'how to prepare for taproot' series: LN with taproot.
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Bitcoin Optech newsletter #138 is here:. - describes discussion about a desired replacement for some BIP70 payment protocol features.- summarizes proposals for a standardized way to exchange fraud proofs for DLCs.- notes updated HWI docs and other PRs.
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Bitcoin Optech newsletter #83 is here:. - announces Eclair 0.3.3.- links to tool for experimenting with taproot/tapscript.- summarizes talk about schnorr signatures w/ precomputed public keys.- describes interactive LN funding tx construction proposal.
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Bitcoin Optech newsletter #133 is here:. - announces a meeting to discuss taproot activation mechanisms.- includes a link to a Bitcoin Core usage survey.- lists top questions and answers from the Bitcoin StackExchange.
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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 list.
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Bitcoin Optech newsletter #82 is here:. - announces LND 0.9.0-beta.- asks for help testing Bitcoin Core 0.19.1rc1.- describes proposal to break linkability between UTXOs and unannounced LN channels.- summarizes a SIGHASH_ANYPREVOUTANYSCRIPT sighash change.
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Bitcoin Optech newsletter #67 is here:. - requests help testing Bitcoin Core and LND release candidates.- tracks discussion about proposed noinput and anyprevout sighash flags.- describes several notable changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech newsletter #159 is here:. - includes questions & answers from the Bitcoin Stack Exchange.- continues the 'how to prepare for taproot' series: learn taproot by using it (Optech Workshop).- announces Rust Bitcoin 0.27.0, C-Lightning 0.10.1rc1.
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Bitcoin Optech newsletter #47 is here:. - describes the bip-anyprevout soft fork proposal.- summarizes a few technical talks from the Magical Crypto Friends conference .- our regular section on bech32 sending support.
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Bitcoin Optech newsletter #174 is here:. - notes ways of integrating DLCs in LN.- summarizes LN dev conference.- describes additional compact block filters verification.- recaps "Add ChainstateManager::ProcessTransaction" Review.- taproot series: thank you.
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Bitcoin Optech newsletter #117 is here:. - describes a compiler bug that casts doubt on the safety of secure systems.- explains a technique that can be used to more efficiently verify ECDSA signatures in Bitcoin.- popular Q&A from the Bitcoin StackExchange.
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Bitcoin Optech newsletter #150 is here:. - announces a change of networks for IRC channels.- celebrates Optech’s 150th newsletter.- includes popular Q&A from the Bitcoin Stack Exchange.- announces Eclair 0.6.0.- announces LND 0.13.0-beta.rc3.
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Earlier today @murchandamus and @bitschmidty spoke with Olaoluwa Osuntokun (@roasbeef), Greg Sanders (@theinstagibbs), and Pieter Wuille (@pwuille) about: . - taproot assets.- PTLCs.- BIP324 Encrypted Transport. Catch up here:.
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Bitcoin Optech newsletter #84 is here:. - seeks help testing a Bitcoin Core release candidate.- summarizes some discussion about the BIP119 OP_CHECKTEMPLATEVERIFY proposal.- includes regular section about notable code and documentation changes.
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Bitcoin Optech newsletter #141 is here:. - describes a technique for signature delegation under Bitcoin’s existing consensus rules.- summarizes discussion about taproot’s effect on Bitcoin’s quantum resistance.- announces weekly taproot activation meetings.
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Bitcoin Optech newsletter #131 is here:. - describes proposed Bitcoin P2P message.- outlines BIP for the bech32 modified address format.- covers idea for preventing dual-funded channel UTXO probing.- summary of 'Add unit testing of node eviction logic' PR.
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Bitcoin Optech newsletter #130 is here:. - describes proposed update to BIP322 generic message signing.- links to a LN trampoline routing spec.- begins coverage of Bitcoin Core GUI ( and Rust Bitcoin ( repos.
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Bitcoin Optech newsletter #158 is here:. - describes changes to services/client software.- continues the 'how to prepare for taproot' series: why wallets should wait before generating taproot addresses.- LND 0.13.1-beta, Rust-Lightning 0.0.99, Eclair 0.6.1.
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Bitcoin Optech newsletter #115 is here:. - recommends checking for nodes vulnerable to the InvDoS attack.- describes the InvDoS attack.- summarizes "Stealing onchain fees from LN HTLC" attack.- links to announcement of the Crypto Open Patent Alliance.
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Bitcoin Optech newsletter #119 is here:. - relays LND security warning.- summarizes LN upfront payments discussion.- describes taproot bech32 addresses thread.- links to proposal for alternate way to secure LN payments.- details the signet PR Review Club.
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Bitcoin Optech newsletter #92 is here:. - describes work on simplified ECDSA adaptor signatures.- Eclair 0.3.4 release.- Bitcoin Core PR Review Club "Retry notfounds with more urgency" coverage.- notable changes to popular Bitcoin infrastructure projects.
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Bitcoin Optech Newsletter #37 is here:. - Asks for help testing Bitcoin Core 0.18.0 RC1.- Describes recent discussions from the Bitcoin-Dev mailing list.- Links to a chapter about payment batching in Optech’s work-in-progress scaling techniques book.
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Bitcoin Optech newsletter #170 is here:. - describes LN implementations vulnerabilities.- summarizes an LN protocol using taproot.- recaps "Extract RBF logic into policy/rbf" PR.- continues 'how to prepare for taproot': is cooperation always an option?.
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Bitcoin Optech newsletter #86 is here:. - announces the 2020 Chaincode Residency program.- describes two proposed routing improvements for LN.- summarizes three talks from the Stanford Blockchain Conference.- links to Q&A from the Bitcoin StackExchange.
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Bitcoin Optech Newsletter #34 is here:. - Discussion on BIP118 SIGHASH_NOINPUT_UNSAFE output tagging.- Progress towards Bitcoin Core hardware wallet integration.- Bitcoin Core v0.18 feature freeze.
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Bitcoin Optech newsletter #110 is here:. - summarizes discussion of SIGHASH_ANYPREVOUT and eltoo.- includes report showing how 57k BTC of fees could've been saved using segwit & batching.- summary of the 'Implement ADDRv2 support' PR Review Club meeting.
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Bitcoin Optech Newsletter #39 is here:. - a proposal to encrypt P2P communication.- Lightning Loop: withdrawing LN funds to an onchain transaction.- links to resources about bech32 adoption.- popular answers from Bitcoin StackExchange.
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Bitcoin Optech newsletter #80 is here:. - requests help testing the next version of LND.- summarizes a discussion about soft fork activation mechanisms.- describes a few notable changes to popular Bitcoin infrastructure software.
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Bitcoin Optech newsletter #111 is here:. - describes possible update to BIP340 schnorr signatures spec.- details BIP that specifies how nodes should handle P2P protocol feature negotiation in a forward compatible way.- changes to services/client software.
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Bitcoin Optech newsletter #184 is here:. - describes proposal to extend PSBTs with fields for spending outputs constructed using a pay-to-contract protocol.- summarizes Q&As from the Bitcoin Stack Exchange.- adds a "Pay-to-Contract (P2C) protocols" topic.
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Bitcoin Optech newsletter #175 is here:. - provides information about the activation of taproot.- summarizes changes to services and client software.- LND 0.14.0-beta.rc4 release candidate.
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Bitcoin Optech newsletter #88 is here:. - links to methods for preventing hardware wallets from leaking information through signatures.- provides updates on the BIP322 generic signmessage protocol.- summarizes a meeting of the Bitcoin Core PR Review Club.
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Bitcoin Optech newsletter #155 is here:. - summarizes two proposed BIPs related to wallet support for taproot .- describes selected Stack Exchange Q&A.- continues the 'how to prepare for taproot' series: Advantages to using P2TR outputs for single-sigs.
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Bitcoin Optech newsletter #68 is here:. - announces the latest LND.- requests RC testing of Bitcoin Core & C-Lightning.- relays taproot BIP updates.- describes proposed increase in default LN routing fees.- summarizes 3 Cryptoeconomic Systems Summit talks.
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Bitcoin Optech Newsletter #16 is out. This week's newsletter is a special summary of notable talks at the recent @ScalingBitcoin conference.
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Bitcoin Optech newsletter #49 is here:. - describes the proposed Erlay protocol.- summarizes an executive briefing by Bitrefill CEO Sergej Kotliar about LN.- lists some recent changes to the COSHV proposal.
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Bitcoin Optech newsletter #135 is here:. - links to last week’s taproot activation meeting summary.- announces new taproot activation meeting.- describes discreet log contracts progress + mailing list.- "Only support compact blocks with witnesses" Review .
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Bitcoin Optech newsletter #73 is here:. - announces a new minor version release of LND.- notes downtime on the development mailing lists.- describes recent updates to Bitcoin services and clients.- summarizes Bitcoin infrastructure projects changes.
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Bitcoin Optech Newsletter #36 is here:. - Announcement of the C-Lightning 0.7 upgrade.- Describes a proposed soft fork to eliminate several old problems in the Bitcoin consensus protocol.
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Bitcoin Optech Newsletter #13 is out. Includes action items related to new security releases of Bitcoin Core, the newly-proposed BIP322, and Optech’s upcoming Paris workshop.
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Bitcoin Optech newsletter #103 is here:. - summarizes fee ransom attack against LN users.- links to discussion about attack against LN atomicity.- reminds about collision attacks on RIPEMD160-based addresses in multiparty protocols.- includes popular Q&A .
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Bitcoin Optech Newsletter #41 is here:. - New release candidates for Bitcoin Core and LND.- Discussion of a proposed 'assume UTXO' mode for Bitcoin Core for fast initial sync.- A demo of bech32 address error detection.
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In this week's Bitcoin Optech Newsletter:. - new version of LND (thanks @lightning).- a tool for generating bitcoin ownership proofs (thanks @Blockstream).- an Optech RBF usability study (thanks @BitSchmidty). (thanks as always to @hrdng!).
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Bitcoin Optech newsletter #66 is here:. - notes a proposed Erlay BIP.- announces vulnerability disclosure in previous LN software .- links to an Optech schnorr/taproot workshop transcript.- includes a BTSE field report on exchange use of Bitcoin tech.
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Bitcoin Optech newsletter #253 is here:. - describes a proposal for a new managed joinpool protocol.- summarizes an idea for relaying transactions using the Nostr protocol.
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