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1374 indexed events in 55 months

2018 | 2019 | 2020 | 2021

December 2022

• Channel jamming attacks
  • CircuitBreaker add-on software to partly mitigate jamming attacks without protocol changes 🔗
  • 2022 year-in-review: channel jamming 🔗
• Replace-by-fee (RBF)
  • Website to monitor unsignaled transaction replacements 🔗
  • 2022 year-in-review: replace-by-fee 🔗
• Version 3 transaction relay
  • Ephemeral anchors implementation as proposed extension to v3 transaction relay policy 🔗
  • 2022 year-in-review: v3 transaction relay 🔗
• Anchor outputs
  • Implementation of ephemeral anchors built on v3 transactions 🔗
• Channel factories
  • Proposed new channel construction to improve compatibility with channel factories 🔗
• Dual funding
  • 2022 year-in-review: interactive and dual funding 🔗
• Fee sponsorship
  • 2022 year-in-review: fee sponsorship 🔗
• Just-in-time (JIT) routing
  • LDK #1835 adds support for JIT channel opens by LN service providers 🔗
• Miniscript
  • 2022 year-in-review: miniscript descriptors in Bitcoin Core 🔗
• MuSig
  • 2022 year-in-review: MuSig2 🔗
• Onion messages
  • 2022 year-in-review: onion messages 🔗
• Output script descriptors
  • 2022 year-in-review: miniscript descriptors in Bitcoin Core 🔗
• Package relay
  • 2022 year-in-review: package relay 🔗
• Quantum resistance
  • 2022 year-in-review: quantum-safe key exchange 🔗
• Reproducible builds
  • New website to monitor the current status of various Bitcoin project’s reproducible builds 🔗
• Silent payments
  • 2022 year-in-review: silent payments 🔗
• Stateless invoices
  • 2022 year-in-review: stateless invoices 🔗
• Transaction pinning
  • Implementation of proposed ephemeral anchors to help prevent pinning attacks 🔗
• Version 2 P2P transport
  • 2022 year-in-review: encrypted v2 transport protocol 🔗
• Zero-conf channels
  • 2022 year-in-review: zero-conf channels 🔗

November 2022

• Channel jamming attacks
  • Paper suggesting solutions to jamming attacks based on local reputation and upfront fees 🔗
  • Reputation credentials proposal to mitigate LN jamming attacks 🔗
• Offers
  • Core Lightning #5646 updates the implementation of offers to remove x-only public keys 🔗
  • Eclair #2499 allows specifying a blinded route to use when using a BOLT12 offer 🔗
• Partially signed bitcoin transactions
  • Rust Bitcoin #957 adds an API for signing PSBTs 🔗
  • LND #7122 adds support for importing PSBTs from binary files 🔗
• Replace-by-fee (RBF)
  • Discussion about mempoolfullrbf option’s effect on mempool consistency 🔗
  • Continued discussion about enabling full-RBF in Bitcoin Core 🔗
• Anchor outputs
  • Proposal to use multiple pre-committed fees to avoid needing anchor outputs in many cases 🔗
• Compact block filters
  • Bitcoin Core #25957 improves the performance of wallet rescans using local block filters 🔗
• Compact block relay
  • Discussion about inconsistent mempools and how that could affect compact block relay 🔗
• Covenants
  • Proposal to use covenants and merkle trees to enable generalized smart contracts 🔗
• Child pays for parent (CPFP)
  • Suggestion for LN to provide an alternative to using CPFP for most HTLC fee bumping 🔗
• CVEs (various)
  • CVE-2017-12842: Bitcoin Core PR Review Club discussion about lowering min relayable tx size 🔗
• Erlay
  • Discussion about inconsistent mempools and how that could affect Erlay 🔗
• Hardware wallet interface (HWI)
  • Bitcoin Core #23578 using HWI to add support for externally signing taproot keypath spends 🔗
• Low-r grinding
  • BDK #779 adds support for creating low-r signatures 🔗
• Multipath payments
  • BOLTs #1031 allows paying slightly more than the requested amount when using multipath 🔗
• Rendez-vous routing
  • Core Lightning #5646 adds support for forwarding blinded payments 🔗
• Responsible disclosures
  • Anthony Towns disclosed a DoS and potential funds loss bug in BTCD and LND 🔗
• Version 2 P2P transport
  • Request for feedback on message identifiers for v2 P2P encrypted transport 🔗
• Version 3 transaction relay
  • Comparing disabling non-replaceable transactions to disabling special v3 transaction relay rules 🔗

October 2022

• Replace-by-fee (RBF)
  • Proposal for relay of v3 transactions allows replacement 🔗
  • Concerns raised about configuration option allowing full replace by fee in Bitcoin Core 🔗
  • History of the term “full RBF” 🔗
  • Continued discussion about mempoolfullrbf option for enabling full RBF 🔗
• Package relay
  • New proposed v3 transactions designed for use with package relay 🔗
  • Suggest to use CPFP with package relay to address RBF-related free option problem 🔗
  • CoreDev.tech transcript of discussion about package relay and v3 transactions 🔗
• Block explorers
  • Idea to use transaction lookup servers to serve unused wallet addresses 🔗
  • Launch of block explorer with private information retrieval capability 🔗
• Erlay
  • BIPs #1370 updates the BIP330 specification of Erlay 🔗
  • Bitcoin Core #23443 adds the sendtxrcncl negotiation message for Erlay 🔗
• Transaction pinning
  • Proposed relay of v3 transactions designed to avoid pinning attacks 🔗
  • Proposed ephemeral anchors to help mitigate pinning attacks 🔗
• Version 2 P2P transport
  • Update on BIP324 v2 encrypted transport protocol 🔗
  • CoreDev.tech discussion of v2 P2P encrypted transport proposal 🔗
• Version 3 transaction relay
  • Proposed new transaction relay policies designed for LN-penalty 🔗
  • Ephemeral anchors proposal built on v3 transaction relay proposal 🔗
• Addr v2
  • BTCD v0.23.2 adds support for addr v2 🔗
• Anchor outputs
  • Proposed relay of v3 transactions attempts to improve on anchor outputs 🔗
• Compact block filters
  • Bitcoin Core #23549 adds scanblocks RPC to scan local compact block filters 🔗
• Countersign
  • CoreDev.tech transcripts: v2 P2P encrypted transport and countersign 🔗
• Child pays for parent (CPFP)
  • Suggestion to use CPFP to address RBF-related free option problem 🔗
• CVEs (various)
  • CVE-2017-12842: discussion of lowering minimum relayable transaction size 🔗
• Dual funding
  • Eclair #2463 and #2461 increase robustness of RBF fee bumping interactive funding 🔗
• Fee sniping
  • CoreDev.tech transcript of discussion about fees and fee sniping 🔗
• Fee sponsorship
  • Proposed ephemeral anchors relay policy to implement sponsorship-like behavior 🔗
• MuSig
  • Disclosure of security vulnerability in MuSig2 as described in a draft BIP 🔗
• Output linking
  • Recommendations for unique address servers 🔗
• Partially signed bitcoin transactions
  • BIPs #1293 adds BIP372 for including Pay-to-contract tweak fields in a PSBT 🔗
• Sidechains
  • Validity rollups research showing how trustless sidechains may be possible 🔗
• SIGHASH_ANYPREVOUT
  • BIPs #1367 simplifies BIP118’s description of SIGHASH_ANYPREVOUT 🔗
• Silent payments
  • BIPs #1349 adds BIP351 for a payment protocol inspired by silent payments 🔗
• Soft fork activation
  • History of how various soft fork proposals were tested prior to activation 🔗
• Tapscript
  • Discussion about lowering tapscript resource limits 🔗
• Threshold signature
  • Transcripts of talks about the FROST and ROAST threshold signature schemes 🔗
• Trampoline payments
  • Eclair #2435 adds support for basic async payments for trampoline relay 🔗
• Uneconomical outputs
  • Discussion about allowing uneconomical outputs that are part of a transaction package 🔗
• Utreexo
  • Launch of ZeroSync project using Utreexo 🔗

September 2022

• SIGHASH_ANYPREVOUT
  • Creating drivechains with APO and a trusted setup 🔗
  • New software fork of Bitcoin Core for testing to include support for APO 🔗
• Anonymity networks
  • Bitcoin Core #25355 adds support for transient I2P addresses 🔗
• Compact block filters
  • LDK #1706 adds support for using compact block filters for downloading confirmed transactions 🔗
• Dual funding
  • Eclair #2406 allows requiring confirmed inputs in the interactive funding protocol 🔗
• Hardware wallet interface (HWI)
  • BDK #682 adds signing capabilities for hardware signing devices using HWI and rust-hwi 🔗
• Offers
  • Eclair #2416 adds support for receiving payments requested using the offers protocol 🔗
• OP_CHECKTEMPLATEVERIFY
  • New software fork of Bitcoin Core for testing to include support for CTV 🔗
• Rendez-vous routing
  • Eclair #2418 and #2408 add support for receiving payments sent with blinded routes 🔗
• Sidechains
  • Creating drivechains with APO and a trusted setup 🔗
• Uneconomical outputs
  • BDK #689 allows a wallet to create a transaction that violates the dust limit 🔗

August 2022

• Output script descriptors
  • BIP proposed to allow multiple derivation paths in a descriptor 🔗
  • Bitcoin Core #23480 adds a rawtr() descriptor 🔗
  • New descriptor proposed for silent payments 🔗
  • How partial descriptors could help create tapleaf trees 🔗
• Zero-conf channels
  • LND #6816 adds documentation about how to use zero-conf channels 🔗
  • Core Lightning 0.12 adds support for zero-conf channels 🔗
  • LND 0.15.1-beta adds support for zero-conf channels 🔗
• Dual funding
  • Eclair #2273 implements the proposed interactive funding protocol 🔗
  • Eclair #2275 completes experimental support for the dual funding protocol 🔗
• Onion messages
  • LDK #1503 adds support for onion messages 🔗
  • LDK #1652 adds support for onion message reply paths 🔗
• Channel jamming attacks
  • Guide to channel jamming attacks and proposed solutions 🔗
• Coin selection
  • Bitcoin Core #24584 prefers input sets composed of a single output type for privacy 🔗
• Compact block relay
  • Rust Bitcoin #1088 adds structures and methods for compact blocks 🔗
• Default minimum transaction relay feerates
  • Discussion about lowering the default minimum transaction relay feerate 🔗
• Discreet Log Contracts (DLCs)
  • Using Bitcoin-compatible BLS signatures for DLCs 🔗
• HD key generation
  • BIP proposed to allow multiple BIP32 derivation paths in a descriptor 🔗
• Rendez-vous routing
  • Eclair #2253 adds support for relaying blinded payments 🔗
• Replace-by-fee (RBF)
  • Bitcoin Core #25610 opts-in the RPCs and -walletrbf to RBF by default 🔗
• Schnorr signatures
  • BDK #718 begins verifying schnorr signatures immediately after the wallet creates them 🔗
• Signet
  • Eclair #2387 adds support for signet 🔗
• Silent payments
  • Updated silent payments PR 🔗
• Splicing
  • BOLTs #1004 makes recommendations to support future detection of splices 🔗
• Static channel backups
  • Core Lightning 0.12 adds support for static channel backups 🔗

July 2022

• Fee sniping
  • BDK #611 begins using anti fee sniping by default 🔗
  • Discussion about fee sniping in relationship to block subsidy 🔗
• Payment probes
  • LDK #1555 now slightly prefers paying through channels which make balance probing harder 🔗
  • LDK #1567 adds support for a basic payment probing API 🔗
• Generic signmessage
  • Proposed BIP for multiformat single-sig message signing 🔗
• Miniscript
  • Bitcoin Core #24148 adds watch-only support for descriptors containing miniscript 🔗
• Onion messages
  • Proposals to either rate limit or charge for onion messages 🔗
• Output linking
  • Updated alternative to BIP47 reusable payment codes 🔗
• Output script descriptors
  • Bitcoin Core #24148 adds watch-only support for descriptors containing miniscript 🔗
• Package relay
  • Bitcoin Core #24836 adds a regtest-only RPC, submitpackage, to help test package relay 🔗
• Partially signed bitcoin transactions
  • Bitcoin Core #22558 adds support for BIP371’s additional PSBT fields 🔗
• Replace-by-fee (RBF)
  • Bitcoin Core fullrbf setting where the node always allows transaction replacement 🔗
• Schnorr signatures
  • LND #6722 adds support for signing arbitrary messages with schnorr signatures 🔗
• Silent payments
  • Updated alternative to BIP47 reusable payment codes compared to silent payments 🔗
• Splicing
  • Discussion about the best way to gossip channel splices 🔗
• Tapscript
  • Question: why do invalid OP_CHECKSIGADD signatures fail their script? 🔗
• Uneconomical outputs
  • Question about problems removing uneconomical outputs from UTXO set 🔗

June 2022

• Zero-conf channels
  • BOLTs #910 adds an option_zeroconf feature bit 🔗
  • LDK #1401 adds support for zero-conf channel opens 🔗
• Fee sniping
  • LDK #1531 begins using anti fee sniping for LN funding transactions 🔗
• Miniscript
  • PR Review Club about miniscript support for descriptors 🔗
• Multisignature
  • Question about the largest multisig quorum possible with different script types 🔗
• MuSig
  • Discussion about designing LN upgrades to support recursive MuSig2 🔗
• Output linking
  • Experimentation with silent addresses 🔗
• Output script descriptors
  • PR Review Club about miniscript support for descriptors 🔗
• Package relay
  • Continued discussion of proposed package relay BIP 🔗
• Payment probes
  • LN developer meeting summary: probing and balance sharing 🔗
• Rendez-vous routing
  • Discussion about the need for LNURL or offers for effective blinded paths 🔗
• Replace-by-fee (RBF)
  • Discussion about enabling full replace by fee in Bitcoin Core (off by default) 🔗
• Taproot
  • Why P2TR outputs should use the noscript commitments when only keypath spending is desired 🔗
• Trampoline payments
  • Discussion about combining trampoline routing with first-hop payment holds 🔗

May 2022

• Covenants
  • When would enabling OP_CAT allow recursive covenants? 🔗
  • Updated OP_TX opcode useful for constructing covenants 🔗
  • Discussion about Miner Extractable Value (MEV) risk from recursive covenants 🔗
• MuSig
  • MuSig2 implementation notes 🔗
  • LND #6361 adds support for MuSig2 signing 🔗
• OP_CHECKTEMPLATEVERIFY
  • Proposal to initially restrict OP_TX to the features provided by OP_CTV 🔗
  • BIPs #1309 updates BIP119’s example implementation to use pythonic pseudocode 🔗
• Coin selection
  • What is the coin selection ‘waste metric’? 🔗
• Compact block relay
  • Bitcoin Core #20799 disables v1 compact block relay; v2 still enabled 🔗
• Child pays for parent (CPFP)
  • BIP proposed for package relay that can make CPFP bumping more reliable 🔗
• Eltoo
  • Using transaction introspection to prevent pinning in eltoo channels 🔗
• Large channels
  • LDK #1425 adds support for large channels 🔗
• Miniscript
  • Adapting descriptors and miniscript for hardware signing devices 🔗
• Minisketch
  • Research into interaction between LN rate limiting and minisketch gossiping 🔗
• Output script descriptors
  • Adapting descriptors and miniscript for hardware signing devices 🔗
• Package relay
  • BIP proposed for package relay 🔗
• Partially signed bitcoin transactions
  • LND #6450 adds support for signing PSBTs that spend taproot outputs 🔗
• Responsible disclosures
  • Bastien Teinturier disclosed issue allowing funds loss from Core Lightning and LND 🔗
• Schnorr signatures
  • Why isn’t OP_CHECKMULTISIG compatible with batch verification of schnorr signatures? 🔗
• Soft fork activation
  • Proposal to use transaction signaling to measure support for consensus changes 🔗
• Taproot
  • LND #6450 adds support for signing PSBTs that spend taproot outputs 🔗
• Transaction pinning
  • Idea to use transaction introspection to prevent RBF pinning 🔗

April 2022

• OP_CHECKTEMPLATEVERIFY
  • Discussion about activating CTV 🔗
  • Implications of bare CTV not having an address format 🔗
• Soft fork activation
  • Discussion about when activating a soft fork is justified 🔗
  • Proposal for automatically reverting soft forks 🔗
• Stateless invoices
  • Core Lightning #5068 adds payer-side support for stateless invoices 🔗
  • LND #5810 implements sending support for payment metadata 🔗
• Channel commitment upgrades
  • Updating LN commitments 🔗
• Coinjoin
  • WabiSabi implemented in Wasabi 2.0 🔗
• Child pays for parent (CPFP)
  • Bitcoin Core #24152 begins accepting low-feerate transactions that are paid for by their children 🔗
• Low-r grinding
  • LDK #1388 adds default support for creating low-r signatures 🔗
• Miniscript
  • Bitcoin Core #24147 adds backend support for miniscript 🔗
• MuSig
  • Proposed BIP for MuSig2 🔗
• Output linking
  • Silent addresses for delinked reusable addresses 🔗
• Payjoin
  • Tradeoffs of WabiSabi as an alternative to payjoin 🔗
• Quantum resistance
  • Discussion about quantum-safe key exchange 🔗
• SIGHASH_ANYPREVOUT
  • Request to activate a slightly modified APO instead of (or before) CTV 🔗
• Signet
  • Analysis of transactions on the CTV signet 🔗
• Silent payments
  • Silent payments proposed 🔗
• Spontaneous payments
  • LND #5414 begins advertising support for previously-implemented keysend payments 🔗
• Taproot
  • Bitcoin Core #23536 begins enforcing taproot on all blocks (except one) with segwit active 🔗
• Vaults
  • Proposal to use simple vaults as one benchmark for comparing different covenant designs 🔗

March 2022

• Covenants
  • Proposed OP_EVICT opcode to make covenants more efficient 🔗
  • Discussion about the risks of allowing recursive covenants 🔗
• Replace-by-fee (RBF)
  • Summary of recent proposed changes to RBF policy 🔗
  • Discussion about allowing transaction witness replacement without a fee bump 🔗
• Channel factories
  • Proposed OP_EVICT opcode to make channel factories more efficient 🔗
• Coinswap
  • Teleport Transactions 0.1 implements routable coinswaps 🔗
• Child pays for parent (CPFP)
  • BTCPay Server 1.4.5 adds support for CPFP fee bumping 🔗
• Fee sniping
  • BIPs #1269 assigns BIP326 to a recommendation for default taproot anti fee sniping 🔗
• Joinpools
  • Proposed OP_EVICT opcode to make joinpools more efficient 🔗
• MuSig
  • Proposal to use MuSig2 in the LN gossip protocol 🔗
• Onion messages
  • Proposal to charge for onion message bandwidth 🔗
• OP_CHECKTEMPLATEVERIFY
  • Continued CTV discussion and the design for a CTV-based vault 🔗
• Output script descriptors
  • Bitcoin Core #24043 adds new multi_a and sortedmulti_a descriptors for taproot multisig 🔗
• Sidechains
  • Opcodes enabling recursive covenants may also permit drivechains 🔗
• Simplicity
  • BTC-Script (based on Chia Lisp) as an alternative to Simplicity 🔗
• Soft fork activation
  • Concern about Speedy Trial activation for controversial soft forks 🔗
• Transaction pinning
  • Idea to prevent pinning by allowing transaction to signal that descendant limits 🔗
• Vaults
  • Design and code for a CTV-based vault 🔗
• Zero-conf channels
  • LDK #1311 adds support for SCID alias field useful for zero-conf channels 🔗

February 2022

• OP_CHECKTEMPLATEVERIFY
  • Discussion about how CTV or other covenant features could make DLCs much more efficient 🔗
  • OP_TXHASH as a proposed alternative to CTV and APO 🔗
  • Parameters published for OP_CHECKTEMPLATEVERIFY signet 🔗
• SIGHASH_ANYPREVOUT
  • Discussion about how APO or other covenant features could make DLCs much more efficient 🔗
  • OP_TXHASH as a proposed alternative to CTV and APO 🔗
• Covenants
  • Proposal for composable OP_TX opcode useful for constructing covenants 🔗
• Discreet Log Contracts (DLCs)
  • Discussion about how CTV or other covenant features could make DLCs much more efficient 🔗
• Fee sponsorship
  • Fee bumping discussion with advocacy for fee sponsorship 🔗
• Generic signmessage
  • BIPs #1279 updates BIP322 with clarifications and test vectors 🔗
• Minisketch
  • New LN gossip wire protocol proposal designed for use with minisketch 🔗
• OP_CHECKSIGFROMSTACK
  • Proposal for OP_TX opcode composable with OP_CHECKSIGFROMSTACK 🔗
• Partially signed bitcoin transactions
  • HWI #549 adds support for PSBT version 2 🔗
• Replace-by-fee (RBF)
  • Discussion about RBF policy, including suggested changes 🔗
• Signet
  • Parameters published for OP_CHECKTEMPLATEVERIFY signet 🔗
• Stateless invoices
  • LDK #1199 uses stateless invoices to allow phantom node payments 🔗

January 2022

• Partially signed bitcoin transactions
  • Bitcoin Core #23718 adds support for displaying hashes and preimages contained in PSBTs 🔗
  • Bitcoin Core #17034 adds support for version 2 PSBTs and for preserving proprietary fields 🔗
  • Rust Bitcoin #681 adds support for BIP371’s additional PSBT fields for taproot 🔗
  • Rust Bitcoin #669 improves partial signature support with discussion about nulldummy vectors 🔗
  • BIPs #1270 updates the PSBT specification to discourage signature placeholders 🔗
• Onion messages
  • Eclair #2099 adds onion message configuration option for controling when to relay messages 🔗
  • Eclair #2117 adds onion message replies in preparation for supporting offers 🔗
  • Eclair #2133 begins relaying onion messages by default 🔗
• Stateless invoices
  • Rust-Lightning #1177 implements stateless payments using the payment secret field 🔗
  • BOLTs #912 adds a new optional field to BOLT11 invoices to enable stateless payments 🔗
  • Eclair #2063 adds support for the new option_payment_metadata invoice field 🔗
• OP_CHECKTEMPLATEVERIFY
  • Bi-weekly IRC meetings scheduled for reviewing and discussing OP_CHECKTEMPLATEVERIFY 🔗
  • Mailing list and IRC discussion of CTV, including criticism and rebuttals 🔗
• Anchor outputs
  • Eclair #2134 enables anchor outputs by default 🔗
• Bech32
  • Bitcoin Core GUI #459 allows users to choose to create bech32m addresses 🔗
• Compact block filters
  • Bitcoin Core #17631 adds new REST endpoint for compact block filters 🔗
• Erlay
  • PR Review Club: #23443 implementing Erlay support signaling 🔗
• Fee sponsorship
  • Fee accounts, an outgrowth from fee sponsorship 🔗
• Offers
  • Eclair #2117 adds onion message replies in preparation for supporting offers 🔗
• Output script descriptors
  • HWI #545 adds support for taproot tr() descriptors 🔗
• Package relay
  • Bitcoin Core #22674 adds logic for validating packages of transactions against relay policy 🔗
• Pay-to-Contract (P2C) protocols
  • PSBT extension for pay-to-contract fields 🔗
• Payment secrets
  • Rust-Lightning #1177 uses the payment secret field to store encrypted invoice information 🔗
• Replace-by-fee (RBF)
  • Proposal to briefly allow full RBF before using default opt-in RBF 🔗
• Taproot
  • Question: is it possible to convert a taproot address into a v0 native segwit address? 🔗

December 2021

• Onion messages
  • C-Lightning #4921 updates the implementation of onion messages 🔗
  • Eclair #2061 adds initial support for onion messages 🔗
  • 2021 year-in-review: onion messages 🔗
• Bech32
  • Bitcoin Core #16807 returns the location of typos in bech32/bech32m addresses 🔗
  • 2021 year-in-review: bech32m addresses 🔗
• Dual funding
  • 2021 year-in-review: dual-funded channels 🔗
  • 2021 year-in-review: liquidity advertisements 🔗
• Output script descriptors
  • Bitcoin Core #22364 adds support for creating taproot descriptors in the wallet 🔗
  • 2021 year-in-review: output script descriptors 🔗
• Point Time Locked Contracts (PTLCs)
  • Discussion about LN protocol changes necessary to support PTLCs 🔗
  • 2021 year-in-review: PTLCs for LN 🔗
• Replace-by-fee (RBF)
  • 2021 year-in-review: BIP125 opt-in replace-by-fee discrepency 🔗
  • 2021 year-in-review: default transaction replacement by fee 🔗
• Anchor outputs
  • Rust-Lightning #1176 adds initial support for anchor outputs-style fee bumping 🔗
• AssumeUTXO
  • Bitcoin Core #23155 extends the dumptxoutset RPC with new information 🔗
• Atomic multipath payments (AMPs)
  • 2021 year-in-review: atomic multipath payments 🔗
• Channel jamming attacks
  • 2021 year-in-review: channel jamming 🔗
• CPFP carve out
  • Research into alternatives to CPFP carve-out for fee bumping in multiparty contract protocols 🔗
• Hardware wallet interface (HWI)
  • HWI #475 adds support for the Blockstream Jade hardware signer 🔗
• Offers
  • 2021 year-in-review: offers 🔗
• Package relay
  • 2021 year-in-review: mempool package acceptance and package relay 🔗
• Partially signed bitcoin transactions
  • Bitcoin Core #22513 allows walletprocesspsbt to sign without finalizing 🔗
• SIGHASH_ANYPREVOUT
  • 2021 year-in-review: SIGHASH_ANYPREVOUT 🔗
• Signet
  • 2021 year-in-review: signet 🔗
• Soft fork activation
  • Analysis of treating taproot outputs as always usable post-activation 🔗
• Taproot
  • 2021 year-in-review: taproot 🔗
• Uneconomical outputs
  • Discussion about removing the dust limit for one particular case 🔗
• Zero-conf channels
  • 2021 year-in-review: zero-conf channel opens 🔗

November 2021

• Taproot
  • Expanded test vectors for taproot published 🔗
  • Taproot activated at block height 709,632 🔗
  • BIPs #1225 updates BIP341 with extended taproot test vectors 🔗
• Atomic multipath payments (AMPs)
  • LND #5803 allows multiple spontaneous payments to the same AMP invoice 🔗
  • LND 0.14.0-beta allows multiple spontaneous payments to the same AMP invoice 🔗
• Anonymity networks
  • Bitcoin Core #23077 enables address relay via CJDNS 🔗
• Bech32
  • Rust Bitcoin #691 adds an API to create bech32m addresses for a P2TR scriptPubKey 🔗
• Channel jamming attacks
  • Summary of LN developer conference, including discussion of channel jamming attacks 🔗
• Compact block filters
  • Discussion of additional compact block filter verification 🔗
• Discreet Log Contracts (DLCs)
  • Mailing list post about DLCs over LN 🔗
• Eclipse attacks
  • LND 0.14.0-beta includes additional eclipse attack protection by sharing block headers 🔗
• Eltoo
  • Summary of LN developer conference, including discussion of eltoo 🔗
• MuSig
  • Summary of LN developer conference, including discussion of MuSig2 🔗
• Offers
  • Summary of LN developer conference, including discussion of offers 🔗
• Onion messages
  • Eclair #1957 adds basic support for onion messages 🔗
• OP_CHECKTEMPLATEVERIFY
  • BIPs #1215 makes several updates to the BIP119 OP_CHECKTEMPLATEVERIFY proposal 🔗
• Point Time Locked Contracts (PTLCs)
  • Summary of LN developer conference, including discussion of PTLCs 🔗
• Spontaneous payments
  • LND #5803 allows multiple spontaneous payments to the same invoice 🔗
• Trampoline payments
  • Summary of LN developer conference, including discussion of trampoline payments 🔗
• Zero-conf channels
  • Rust-Lightning #1078 adds channel_type negotiation useful for zero-conf channels 🔗

October 2021

• Uneconomical outputs
  • Multiple implementations of BOLTs #894 which allow using a lower commitment tx dust limit 🔗
  • Multiple implementations of LN vulnerable to uneconomical spending CVEs 🔗
  • Bitcoin Core #22863 documents P2TR dust amount 🔗
  • BOLTs #894 specifies various checks related to uneconomical payments in LN 🔗
• Bech32
  • Rust Bitcoin #563 adds support for bech32m addresses for P2TR outputs 🔗
  • Instructions for creating bech32m addresses in Bitcoin Core 🔗
• Eltoo
  • Inherited identifiers proposal with an alternative channel commiment mechanism to eltoo 🔗
  • LN PTLC proposal providing some of the same benefits of eltoo without a soft fork 🔗
• Output linking
  • Preparing for taproot: impact of a new output script on output linkability 🔗
  • Bitcoin Core #23065 allows the wallet to persistently prevent spending of spam UTXOs 🔗
• Output script descriptors
  • Coldcard 4.1.3 adds support for descriptor-based wallets 🔗
  • Bitcoin Core #23002 makes descriptor-based wallets the default for new wallets 🔗
• Point Time Locked Contracts (PTLCs)
  • Proposal to upgrade LN to use PTLCs 🔗
  • Using PTLCs for non-custodial offline receiving 🔗
• Taproot
  • Preparing for taproot: is cooperation always an option? 🔗
  • Taproot triva: origins, naming, and related prior work 🔗
• Channel factories
  • Inherited identifiers proposal with an alternative channel factory design 🔗
• Channel jamming attacks
  • Making jamming attacks more expensive by lowering the cost of probing 🔗
• Coin selection
  • Bitcoin Core #17526 adds Single Random Draw coin selection algorithm 🔗
• Coinjoin
  • Sparrow 1.5.0 adds coinjoin suport 🔗
• Joinpools
  • Post-taproot soft fork ideas: OP_TAPLEAF_UPDATE_VERIFY 🔗
• Pay-to-Contract (P2C) protocols
  • Taproot history: pay to contract protocol 🔗
• Payment probes
  • Lowering the cost of probing to make attacks more expensive 🔗
• Partially signed bitcoin transactions
  • LND #5363 allows PSBTs to be finalized by external software 🔗
• SIGHASH_ANYPREVOUT
  • Inherited identifiers proposal as an alternative to SIGHASH_ANYPREVOUT 🔗
• Tapscript
  • Rust Bitcoin #644 adds support for tapscript’s new opcodes 🔗
• Vaults
  • Should vaults always have a cooperative taproot keypath spend? 🔗
• Watchtowers
  • Inherited identifiers proposal with alternative simplified watchtower design 🔗

September 2021

• Taproot
  • Updating LN for taproot: P2TR channels 🔗
  • BTCPay server #2830 adds support for P2TR receiving and spending 🔗
  • Specter v1.6.0 adds support for single-key taproot 🔗
  • Fully Noded v0.2.26 adds support for P2TR receiving and spending 🔗
• Anchor outputs
  • BOLTs #824 adds a variation on the anchor outputs protocol that prevents a fee-stealing attack 🔗
  • Eclair #1932 implements the zero HTLC fee anchor outputs protocol 🔗
  • Complications for HD wallet recovery in zero HTLC fee anchor outputs protocol 🔗
• Partially signed bitcoin transactions
  • BIP174.org simplifies decoding and modifying PSBTs 🔗
  • MIME type proposed for PSBTs 🔗
• Signet
  • Discussion about adding regular reorgs to the default signet 🔗
  • Preparing for taproot: testing on signet 🔗
• Vaults
  • Updating vaults for taproot 🔗
  • OP_TAPLEAF_UPDATE_VERIFY opcode proposed that would simplify some vault designs 🔗
• Anonymity networks
  • Bitcoin Core 22.0 adds support for I2P connections and removes v2 Tor connections 🔗
• Coin selection
  • Bitcoin Core #22009 introduces new heuristic to compare the effectiveness of coin selection results 🔗
• Compact block relay
  • Disabling compact block relay for -blocksonly nodes 🔗
• Covenants
  • OP_TAPLEAF_UPDATE_VERIFY opcode proposed with a taproot-native covenant design 🔗
• Child pays for parent (CPFP)
  • Proposal of initial CPFP rules for mempool package acceptance before implementing package relay 🔗
• Discreet Log Contracts (DLCs)
  • Discussion about DLC specification breaking changes 🔗
• Eltoo
  • Eltoo demo implementation with new blog post overview 🔗
• Generic signmessage
  • Preparing for taproot: generic signmessage still needed 🔗
• HD key generation
  • Complications for HD wallet recovery in zero HTLC fee anchor outputs protocol 🔗
• Hash Time Locked Contract (HTLC)
  • Updating LN for taproot: from HTLCs to PTLCs 🔗
• Joinpools
  • OP_TAPLEAF_UPDATE_VERIFY proposal to simplify covenant and joinpool implementation 🔗
• Output script descriptors
  • BIPs #1143 introduces BIPs 380-386 specifying output script descriptors 🔗
• Package relay
  • Proposal of initial rules for mempool package acceptance before implementing package relay 🔗
• Point Time Locked Contracts (PTLCs)
  • Updating LN for taproot: from HTLCs to PTLCs 🔗
• Replace-by-fee (RBF)
  • Proposal of initial RBF rules for mempool package acceptance before implementing package relay 🔗
• Responsible disclosures
  • Ajmal Aboobacker and Abdul Muhaimin disclose cross-site scripting vulnerabilities in BTCPay Server 🔗
• Stateless invoices
  • Stateless invoices to avoid tracking unused payment requests 🔗
• Transaction bloom filtering
  • Rust Bitcoin #580 adds support for the BIP37 P2P network messages 🔗

August 2021

• Multisignature
  • Preparing for taproot: multisignature overview 🔗
  • Preparing for taproot: challenges with multisignature nonces 🔗
• Offers
  • C-Lightning 0.10.1 updates the experimental implementation of offers 🔗
  • Spark Lightning Wallet adds partial support for offers 🔗
• Uneconomical outputs
  • Discussion about removing the dust limit 🔗
  • Rust-Lightning #1009 adds a max_dust_htlc_exposure_msat channel configuration option 🔗
• Adaptor signatures
  • Preparing for taproot: signature adaptors 🔗
• Coinjoin
  • JoinMarket 0.9.0 released with implementation of fidelity bonds for coinjoin sybil resistance 🔗
• Dual funding
  • C-Lightning 0.10.1 updates the experimental implementation of dual funding 🔗
• Hash Time Locked Contract (HTLC)
  • Privacy problems with HTLCs 🔗
• Liquidity advertisements
  • Question: Will liquidity ads allow for third-party purchased liquidity (‘sidecar channels’)? 🔗
• Multipath payments
  • Discussion about the effect of base fees on multipath payment costs 🔗
• MuSig
  • Overview of MuSig1, MuSig2, and MuSig-DN 🔗
• Package relay
  • Bitcoin Core #21800 implements ancestor and descendant limits for mempool package acceptance 🔗
• Payment secrets
  • BOLTs #887 updates BOLT11 to require that spenders specify the payment secret 🔗
• Point Time Locked Contracts (PTLCs)
  • Preparing for taproot: PTLCs 🔗
• Reproducible builds
  • Bitcoin Core #22642 allows concatenation of Guix-based attestations for batch verification 🔗
• Spontaneous payments
  • Rust-Lightning #967 adds support for sending keysend-style spontaneous payments 🔗
• Transaction bloom filtering
  • History of the mempool P2P message being deprecated along with BIP37 bloom filters 🔗

July 2021

• Output script descriptors
  • Seven BIPs proposed for standardized output script descriptors 🔗
  • Preparing for taproot: output script descriptors 🔗
  • Bitcoin Core #19651 adds support for updating descriptors via importdescriptor 🔗
  • Output script descriptors versus versioned and unversioned BIP32 seeds 🔗
• Bech32
  • Wiki page for tracking wallet & service support of bech32m 🔗
  • Sparrow wallet adds support for bech32m addresses 🔗
• Taproot
  • BIPs #1137 adds BIP86 with a key derivation scheme for single key P2TR outputs 🔗
  • Sparrow wallet adds support for P2TR keypath spends on regtest and signet 🔗
• Addr v2
  • BIPs #1134 clarifies BIP155 usage of `sendaddr2’ P2P feature negotiation message 🔗
• Anonymity networks
  • Bitcoin Core #22112 changes the assumed port for I2P addresses to be 0 instead of 8333 🔗
• Block explorers
  • BTCPay Server #2655 improves privacy by not sending HTTP referer field to explorers 🔗
• Discreet Log Contracts (DLCs)
  • Alpha release of Suredbits’s DLC wallet 🔗
• Dual funding
  • C-Lightning #4639 adds experimental support for liquidity advertisments based on dual funding 🔗
• HD key generation
  • No changes to BIP32 derivation needed to implement taproot receiving support 🔗
• Liquidity advertisements
  • C-Lightning #4639 adds experimental support for liquidity advertisements 🔗
• Offers
  • Offers specification updated to no longer require a signature 🔗
• OP_CHECKSIGFROMSTACK
  • Call for OP_CHECKSIGFROMSTACK design suggestions 🔗
• Payment secrets
  • C-Lightning #4646 makes payment secrets required 🔗
• Partially signed bitcoin transactions
  • BIPs #1139 adds BIP371 specifying new fields for using PSBTs with P2TR spends 🔗
• Reproducible builds
  • Question: what’s the purpose of Guix within Gitian? 🔗
• Schnorr signatures
  • Libsecp256k1 #844 updates schnorr API to allow signing arbitrary length messages 🔗
• SIGHASH_ANYPREVOUT
  • BIPs #943 updates BIP118 to be named SIGHASH_ANYPREVOUT rather than SIGHASH_NOINPUT 🔗
• Unannounced channels
  • C-Lightning #4611 updates the keysend RPC to support unannounced channels 🔗
• Zero-conf channels
  • Discussion about standardizing zero-conf channel opens 🔗

June 2021

• Taproot
  • Bitcoin Core #22051 adds support for importing descriptors for taproot outputs 🔗
  • Taproot locked in; activation to occur at block 709,632 🔗
  • Bitcoin Core #21365 allows the wallet to create signatures for P2TR spends 🔗
  • Proposed BIP to standardize a wallet path for single-sig P2TR addresses 🔗
• Bech32
  • C-Lightning 🔗
  • Preparing for taproot #1: bech32m sending support 🔗
  • Rust Bitcoin #601 adds support for parsing bech32m addresses 🔗
• Atomic multipath payments (AMPs)
  • LND #5336 adds the ability for users to reuse AMP invoices non-interactively 🔗
  • LND 0.13.0-beta allows receiving and sending payments using AMP 🔗
• HD key generation
  • Bitcoin Core #22095 adds test to ensure BIP32 derived keys are correctly padded 🔗
  • Proposed BIP32 key derivation path for single-sig P2TR 🔗
• Replace-by-fee (RBF)
  • Proposal to allow any mempool transaction to be replaced by default 🔗
  • Trezor wallet software defaults to enabling BIP125 RBF 🔗
• Adaptor signatures
  • Question: Why does blockwide signature aggregation prevent adaptor signatures? 🔗
• Anchor outputs
  • LND 0.13.0-beta begins using anchor outputs by default for all new channels 🔗
• Anonymity networks
  • Bitcoin Core #22050 drops support for deprecated version 2 Tor onion services 🔗
• Channel commitment upgrades
  • C-Lightning #4532 adds experimental support for upgrading a channel 🔗
• Coinjoin
  • Candidate set based block templates may help fee bumping large coinjoins 🔗
• Child pays for parent (CPFP)
  • Candidate set block templates may make some CPFP fee bumps more effective 🔗
• Fee sniping
  • BIP proposed for wallets to set nSequence by default on taproot transactions 🔗
• Hardware wallet interface (HWI)
  • Bitcoin Core GUI #4 adds initial support for using HWI external signers via the GUI 🔗
• Large channels
  • BOLTs #877 removes the protocol-level per-payment amount limit 🔗
• MuSig
  • Benchmark: 1 million signers with MuSig 🔗
• Output script descriptors
  • Bitcoin Core #22051 adds support for importing descriptors for taproot outputs 🔗
• Package relay
  • Bitcoin Core #20833 allows testmempoolaccept to evaluate descendant transaction chains 🔗
• Payjoin
  • BTCPay Server #2450 makes generating payjoin-compatible invoices the default for new hot wallets 🔗
• Payment batching
  • Candidate set based block templates may help fee bumping batched payments 🔗
• Payment secrets
  • LND #5336 allows non-interactive reuse of AMP invoices by changing the payment secret 🔗
• Partially signed bitcoin transactions
  • PSBT extensions for taproot 🔗
• Signet
  • LND #5025 adds basic support for using signet 🔗
• Tapscript
  • Bitcoin Core #21365 allows the wallet to create signatures for tapscript spends 🔗

May 2021

• Taproot
  • Miners encouraged to start signaling readiness for taproot 🔗
  • Bitcoin Core 0.21.1 released ready to activate taproot 🔗
  • BIPs #1104 adds activation parameters to the BIP341 taproot specification 🔗
  • Rust Bitcoin #589 starts implementing support for taproot and schnorr signatures 🔗
• HD key generation
  • Closing lost LN channels with only a BIP32 seed 🔗
  • BIPs #1089 assigns BIP87 to proposal for standardized BIP32 paths for multisig wallets 🔗
  • BIPs #1097 assigns BIP129 to proposal for exchange of xpubs during multisig wallet set up 🔗
• Soft fork activation
  • Miners encouraged to start signaling readiness for taproot 🔗
  • Bitcoin Core 0.21.1 released ready to activate taproot 🔗
  • BIPs #1104 adds activation parameters to the BIP341 taproot specification 🔗
• Atomic multipath payments (AMPs)
  • LND #5159 adds support for making spontaneous AMPs 🔗
  • LND #5253 adds support for Atomic Multipath Payment (AMP) invoices 🔗
• Bech32
  • Blockchain.com adds support for bech32 receiving and spending 🔗
  • Electrum 4.1.0 adds support for bech32m 🔗
• Child pays for parent (CPFP)
  • Bitcoin Core #21359 allows CPFP fee bumping incoming payments 🔗
  • Sparrow 1.4.0 adds support for CPFP fee bumping from transaction list 🔗
• Output script descriptors
  • Bitcoin Core #20867 increases the maximum multisig keys for descriptors to 20 🔗
  • BIPs #1089 assigns BIP87 to a multisig wallet standard using descriptors 🔗
• Payment secrets
  • Rust-Lightning #893 requires payment secrets to prevent multipath probing 🔗
  • Eclair #1810 makes it mandatory for peers to signal and comply with the payment_secret feature 🔗
• Partially signed bitcoin transactions
  • LND #5291 improves the way it ensures PSBTs use segwit inputs 🔗
  • BlueWallet v6.1.0 adds support for using PSBTs with watch-only wallets 🔗
• Replace-by-fee (RBF)
  • CVE-2021-31876 discrepancy between BIP125 and Bitcoin Core implementation 🔗
  • Continued discussion about CVE-2021-31876’s impact on protocols using RBF 🔗
• Anchor outputs
  • LND #5274 limits the maximum funds reserved for fee bumping anchor outputs 🔗
• AssumeUTXO
  • Bitcoin Core #19521 simplifies generating UTXO set hashes for old blocks 🔗
• CVEs (various)
  • CVE-2021-31876: discrepancy between BIP125 and Bitcoin Core implementation 🔗
• Dual funding
  • C-Lightning #4489 adds plugin for configuring dual-funding behavior 🔗
• Multipath payments
  • Electrum 4.1.0 adds support for multipath payments 🔗
• Reproducible builds
  • Bitcoin Core #21462 adds tooling for attesting to Guix-based builds 🔗
• Responsible disclosures
  • Antoine Riard disclosed CVE-2021-31876 enhanced pinning against LN due to BIP125 discrepancy 🔗
• Schnorr signatures
  • Rust Bitcoin #589 starts implementing support for taproot and schnorr signatures 🔗
• Segregated witness
  • Bitcoin Core #21009 removes logic needed to upgrade a pre-segwit node to segwit 🔗
• Static channel backups
  • Closing lost channels with only a BIP32 seed and option_data_loss_protect 🔗
• Trampoline payments
  • Electrum 4.1.0 adds support for trampoline payments 🔗
• Transaction pinning
  • CVE-2021-31876 reduces expected cost of some pinning attacks 🔗

April 2021

• Soft fork activation
  • Compromise proposed to use MTP to activate taproot with speedy trial 🔗
  • PR Review Club discussion about burying past soft fork deployments 🔗
  • Bitcoin Core #21377 and #21686 add taproot activation mechanism and params 🔗
• Anonymity networks
  • Bitcoin Core #21594 adds a network type field to the getnodeaddresses RPC 🔗
  • Bitcoin Core #20197 updates eviction logic to keep long-running onion peers 🔗
• Dual funding
  • C-Lightning 0.10.0 includes experimental support for dual funding 🔗
  • Dual funding’s interactive construction used in splicing proposal 🔗
• Taproot
  • Compromise proposed to use MTP to activate taproot with speedy trial 🔗
  • Bitcoin Core #21377 and #21686 add taproot activation mechanism and params 🔗
• Adaptor signatures
  • Libsecp256k1-zkp #117 adds support for simplified ECDSA signature adaptors 🔗
• Anchor outputs
  • Request for feedback on using anchor outputs by default in LND 🔗
• ASICBoost
  • Question about block templates versus actual blocks: ASICBoost explains one difference 🔗
• Atomic multipath payments (AMPs)
  • LND #5108 adds support for spontaneous multipath payments using AMP 🔗
• Child pays for parent (CPFP)
  • Challenges of using CPFP fee bumps for LN commitment transactions 🔗
• Fee sponsorship
  • Call for topics in layer-crossing workshop, including fee sponsorship 🔗
• Miniscript
  • Specter-DIY v1.5.0 adds support for miniscript 🔗
• Multisignature
  • Signature adaptors without requiring support for multisignatures 🔗
• Offers
  • Offers specification updated to partly address stuck payments 🔗
• OP_CHECKTEMPLATEVERIFY
  • Public launch of Sapio with support for using OP_CHECKTEMPLATEVERIFY 🔗
• Output script descriptors
  • Specter-DIY v1.5.0 adds full descriptor support 🔗
• Package relay
  • Upcoming relay policy workshop to discuss package relay and other topics 🔗
• Pay-to-Contract (P2C) protocols
  • Question: Can Taproot commit arbitrary data to chain without any additional footprint? 🔗
• Payjoin
  • BTCPay Server #2425 allows receiving payjoin payments without an inovice 🔗
• Replace-by-fee (RBF)
  • Upcoming relay policy workshop to discuss RBF and other topics 🔗
• Side channels
  • Libsecp256k1 #906 reduces iterations when using a constant-time signing algorithm 🔗
• Signet
  • Discussion about multiple signet compatibilty with soft fork activation 🔗
• Splicing
  • Draft specification for LN splicing based on interactive funding protocol 🔗
• Spontaneous payments
  • LND #5108 adds support for spontaneous multipath payments using AMP 🔗
• Timelocks
  • Challenges related to timelocks when using CPFP fee bumping in LN 🔗

March 2021

• Taproot
  • Alternative methods of activating taproot discussed 🔗
  • Documenting the intention to use and build upon taproot 🔗
  • Discussion of quantum computer attacks on taproot 🔗
  • Regular meetings scheduled to help activate taproot 🔗
• Bech32
  • BTCPay Server #2181 uppercases bech32 addresses in QR codes 🔗
  • Bitcoin Core #20861 implements support for bech32m addresses 🔗
  • BitMEX exchange announces support for bech32 deposit addresses 🔗
• Anonymity networks
  • Question: how to use I2P with Bitcoin Core? 🔗
  • Bitcoin Core #20685 adds support for the I2P privacy network 🔗
• Hardware wallet interface (HWI)
  • Significantly updated and extended HWI documentation 🔗
  • Bitcoin Core #16546 adds external signer interface compatible with HWI 🔗
• Partially signed bitcoin transactions
  • C-Lightning #4428 switches an RPC to accepting PSBTs for enhance validation 🔗
  • BIPs #1059 publishes the draft specification for v2 PSBTs as BIP370 🔗
• Soft fork activation
  • BIPs #1069 makes BIP8 signal threshold configurable and reduces default 🔗
  • Taproot activation mailing list discussion; Speedy Trial attempt proposed 🔗
• Addr v2
  • Bitcoin Core #20685 Adds I2P support, including addrv2 gossiping 🔗
• Anchor outputs
  • Eclair 0.5.1 adds and updates features preparing for anchor outputs 🔗
• BIP70 payment protocol
  • Mailing list discussion about a BIP70 replacement 🔗
• Discreet Log Contracts (DLCs)
  • Discussion of fraud proofs in DLC v0 specification 🔗
• Dual funding
  • C-Lightning #4410 updates experimental implementation dual funding 🔗
• Erlay
  • PR Review Club: #18261 implementing Erlay 🔗
• Hash Time Locked Contract (HTLC)
  • Eclair #1738 combines multiple HTLC enforcements into a single transaction 🔗
• Just-in-time (JIT) routing
  • Paper analyzes effect of JIT rebalancing on payment success rate 🔗
• Multipath payments
  • New paper analyzes benefit of multipath payments on routing success 🔗
• Output linking
  • Reused hash-based addresses provide no quantum resistance 🔗
• Output script descriptors
  • Specter v1.2.0 includes support for Bitcoin Core descriptor wallets 🔗
• Quantum resistance
  • Discussion of quantum computer attacks on taproot 🔗
• Replace-by-fee (RBF)
  • Recovering lost LN funding transactions after RBF fee bumping 🔗
• Side channels
  • Libsecp256k1 #831 implements SafeGCD algorithm which speeds up side-channel resistant signing 🔗
• Signer delegation
  • Signing delegation under existing consensus rules 🔗
• Spontaneous payments
  • C-Lightning #4404 allows keysending to nodes that don’t advertise support 🔗
• Tapscript
  • Using backup tapscript spending paths to recover from crypto breaks 🔗

February 2021

• Soft fork activation
  • Taproot activation meeting summary and follow-up meeting schedule 🔗
  • BIPs #1021 eases BIP8 LockinOnTimeout=True signaling requirements 🔗
  • BIPs #1020 updates BIP8 to no longer require signaling during lockin period 🔗
  • Summary of second taproot activation meeting and mailing list discussion 🔗
• Compact block filters
  • New Rust-Language light client released using compact block filters 🔗
  • Question about high bandwidth requirements for serving BIP157 filters 🔗
  • Bitcoin Core #15946 allows retaining filters on a pruned node 🔗
• Output script descriptors
  • Bitcoin Core #20226 adds new listdescriptors RPC for its wallet 🔗
  • Bitcoin Dev Kit v0.2.0 released with descriptor support 🔗
  • Bitcoin Core #19136 extends getaddressinfo to return parent descriptors 🔗
• Compact block relay
  • Bitcoin Core PR Review Club about dropping support for v1 compact blocks 🔗
  • Bitcoin Core #20764 adds BIP152 high bandwidth indicator to bitcoin-cli 🔗
• Partially signed bitcoin transactions
  • BIPs #988 updates BIP174 to require output fields be initialized 🔗
  • BIPs #1055 updatse BIP174 with new versioning information 🔗
• Taproot
  • Summary of taproot activation discussion & additional meeting scheduled 🔗
  • Summary of taproot activation discussion regarding BIP8 LOT parameter 🔗
• Bech32
  • BIPs #1056 adds BIP350 for bech32m 🔗
• Channel jamming attacks
  • Renewed discussion about bidirectional upfront LN fees 🔗
• Covenants
  • Replicating the OP_CSFS covenant-enabling opcode with OP_CAT and schnorr signatures 🔗
• Discreet Log Contracts (DLCs)
  • New mailing list for discussion of DLC protocol development 🔗
• Exfiltration resistant signing
  • Description of anti-exfiltration technique being used in BitBox02 and Jade hardware wallets 🔗
• Generic signmessage
  • BIPs #1048 rewrites BIP322 to simplify implementation 🔗
• HD key generation
  • Proposal for secure exchange of BIP32 xpubs during multisig wallet set up 🔗
• OP_CHECKSIGFROMSTACK
  • Replicating OP_CHECKSIGFROMSTACK with schnorr signatures and OP_CAT 🔗
• Point Time Locked Contracts (PTLCs)
  • Technique for implementing logical OR on LN using PTLCs 🔗
• Schnorr signatures
  • Comparison of SSS to OP_CHECKMULTISIG to schnorr multisignatures 🔗
• Side channels
  • New SafeGCD algorithm can speed up signing while remaining side-channel resistant 🔗
• SIGHASH_ANYPREVOUT
  • Using schnorr signatures plus OP_CAT to simulate SIGHASH_ANYPREVOUT 🔗
• Vaults
  • Using schnorr signatures plus OP_CAT to create vaults 🔗

January 2021

• Output script descriptors
  • Bitcoin Core 0.21.0 released with experimental native descriptor wallets 🔗
  • BTCPay Server #2169 adds functions for importing some descriptors 🔗
  • BTCPay Server 1.0.6.7 released with support for descriptors in wallet setup 🔗
• Addr v2
  • Bitcoin Core 0.21.0 released with version 2 addr support 🔗
  • Rust Bitcoin 0.26.0 released with version 2 addr support 🔗
• Anchor outputs
  • LND 0.12.0-beta adds watchtower support for channels using anchor outputs 🔗
  • LND #4908 reserves a balance for fee bumping when using anchor outputs 🔗
• Anonymity networks
  • Bitcoin Core GUI #162 adds network type information to the GUI Peers window 🔗
  • Bitcoin Core 0.21.0 released with support for Tor v3 onion addresses 🔗
• Compact block filters
  • Bitcoin Core 0.21.0 released with support for serving compact block filters 🔗
  • Question: how do clients using BIP157 receive unconfirmed transactions? 🔗
• Payjoin
  • Discussion about how to increase payjoin adoption 🔗
  • Coldcard hardware wallet adds support for paying payjoin 🔗
• Signet
  • Bitcoin Core 0.21.0 released with support for signets 🔗
  • Bitcoin Core #19937 adds utilities for mining signet blocks 🔗
• AssumeUTXO
  • MuHash function added in preparation for tracking UTXO state hashes 🔗
• Bech32
  • Draft BIP for bech32m 🔗
• Dual funding
  • Preventing UTXO probing in dual funded channels; PoDLE tradeoffs 🔗
• Eclipse attacks
  • Proposed disabletx message to help allow more block-relay-only peers 🔗
• Generic signmessage
  • Proposed rewrite of BIP322 to simplify implementation 🔗
• Offers
  • C-Lightning 0.9.3 released with experimental offers support 🔗
• Payment probes
  • Preventing UTXO probing in dual funded channels 🔗
• Partially signed bitcoin transactions
  • LND 0.12.0-beta adds a new psbt wallet subcommand for PSBTs 🔗
• Replace-by-fee (RBF)
  • Question: would first-seen-safe prevent confirmed RBF double spends? 🔗
• Reproducible builds
  • Bitcoin Core #17920 adds Guix support for macOS builds 🔗
• Soft fork activation
  • Meeting scheduled to discuss taproot activation 🔗
• Taproot
  • Meeting to discuss taproot activation mechanisms 🔗
• Vaults
  • Making hardware wallets compatible with advanced features, like vaults 🔗

December 2020

• Anchor outputs
  • LND #4782 adds watchtower client support for channels using anchor outputs 🔗
  • LND #4779 allows sweeping HTLCs from anchor outputs 🔗
  • BOLT5 updated to prevent a pinning attack against anchor outputs 🔗
  • 2020 year in review: anchor outputs 🔗
• Bech32
  • Bech32 algorithm revision research and proposal 🔗
  • Problems with QR-encoded bech32 BIP21 invoices with uppercase schema 🔗
  • Q&A: What is the difference between ‘native segwit’ and ‘bech32’? 🔗
  • 2020 year in review: taproot’s need for a modified bech32 address format 🔗
• Addr v2
  • Bitcoin Core #20564 only sends addrv2 to protocol version 70016 peers 🔗
  • BIP155 updated to require sendaddrv2 message be sent before verack 🔗
  • 2020 year in review: version 2 addr message 🔗
• Eclipse attacks
  • Review Club chat about PR #19858 to make eclipse attacks more difficult 🔗
  • Bitcoin Core PR #19858 improves partition resistance to eclipse attacks 🔗
  • 2020 year in review: fast eclipse attacks against LN nodes 🔗
• Channel jamming attacks
  • Fidelity bonds to prevent channel jamming attacks 🔗
  • 2020 year-in-review: LN channel jamming attacks 🔗
• Coinswap
  • 2020 year-in-review: succinct atomic swaps 🔗
  • 2020 year-in-review: routed coinswap discussion and implementation 🔗
• Hash Time Locked Contract (HTLC)
  • 2020 year in review: switching LN from HTLCs to PTLCs 🔗
  • 2020 year in review: HTLC mining incentives 🔗
• Offers
  • C-Lightning #4255 is the first of a series of PRs for offers 🔗
  • 2020 year in review: LN offers 🔗
• Partially signed bitcoin transactions
  • A new backwards-incompatible version of PSBT is proposed 🔗
  • New PSBT Toolkit software provides GUI for working with PSBTs 🔗
• Soft fork activation
  • Q&A comparison of different soft fork activation mechanisms 🔗
  • 2020 year-in-review: soft fork activation mechanisms 🔗
• Adaptor signatures
  • 2020 year in review: signature adaptors for LN channel commitments 🔗
• Anonymity networks
  • Year-in-review: support for Tor v3 onion addresses 🔗
• Compact block filters
  • 2020 year in review: compact block filters 🔗
• Compact block relay
  • Bitcoin Core #19776 updates getpeerinfo RPC with BIP152 peer status 🔗
• CVEs (various)
  • CVE-2020-26896: LND #4752 updates preimage revelation code 🔗
• Discreet Log Contracts (DLCs)
  • 2020 year-in-review: four compatible implementations of DLCs 🔗
• Dual funding
  • 2020 year-in-review: LN dual funding and interactive funding 🔗
• Generic signmessage
  • 2020 year in review: generic signmessage 🔗
• Large channels
  • 2020 year in review: large channels 🔗
• Miniscript
  • Formal specification of miniscript 🔗
• MuSig
  • 2020 year in review: MuSig2 🔗
• Output linking
  • 2020 year in review: transaction origin privacy 🔗
• Output script descriptors
  • Bitcoin Wallet Tracker (BWT) adds descriptor support 🔗
• Payjoin
  • 2020 year in review: payjoin 🔗
• Payment batching
  • BOLTs #803 adds recommendations for securely using batches to settle HTLCs 🔗
• Payment secrets
  • LND #4752 prevents the node from releasing a local payment preimage without a payment secret 🔗
• Point Time Locked Contracts (PTLCs)
  • 2020 year in review: switching LN from HTLCs to PTLCs 🔗
• Replace-by-fee (RBF)
  • Sparrow wallet adds support for RBF fee bumping 🔗
• Schnorr signatures
  • 2020 year in review: Taproot, tapscript, and schnorr signatures 🔗
• Signet
  • 2020 year in review: signet 🔗
• Taproot
  • 2020 year in review: Taproot, tapscript, and schnorr signatures 🔗
• Tapscript
  • 2020 year in review: Taproot, tapscript, and schnorr signatures 🔗
• Timelocks
  • BOLTs #803 updates BOLT5 with recommendations for handling timelocks near maturity 🔗
• Transaction pinning
  • BOLT5 updated to prevent a transaction pinning attack 🔗
• Vaults
  • 2020 year in review: vaults 🔗
• Watchtowers
  • LND #4782 adds watchtower client support for channels using anchor outputs 🔗

November 2020

• CVEs (various)
  • CVE-2020-26896: BOLTs #808 adds warning about improper preimage revelation 🔗
  • CVE-2020-26895: BOLTs #807 adds warning about non-standard signatures 🔗
• Output script descriptors
  • C-Lightning #4171 allows retrieving the wallet’s onchain descriptors 🔗
  • Q&A about migration from legacy wallets to descriptor wallets 🔗
• Soft fork activation
  • Survey released with developer preferences for soft fork activations 🔗
  • Website listing miner support for taproot activation 🔗
• Taproot
  • Summary of results from surveying developers about taproot activation 🔗
  • Website tracking miner support for taproot before signaling begins 🔗
• AssumeUTXO
  • Review Club summary of MuHash implementation for quickly hashing UTXO set 🔗
• Channel jamming attacks
  • Bi-directional upfront fees to mitigate jamming attacks 🔗
• Eclipse attacks
  • Eclair #1545 adds multiple header sources to make eclipse attacks harder 🔗
• Hold invoices
  • Discussion about bi-directional fees to allow charging for hold invoices 🔗
• Multipath payments
  • Eclair #1599 improves multipath spending to direct channel counterparties 🔗
• Payjoin
  • Sparrow Wallet 0.9.7 adds support for BIP78 payjoin 🔗
• Payment batching
  • Sparrow wallet adds support for payment batching 🔗
• Signet
  • Bitcoin Core #20145 adds script for requesting signet coins 🔗

October 2020

• Channel jamming attacks
  • Eclair #1539 implements a simple measure to reduce channel jamming attacks 🔗
  • Incremental routing as an alternative to upfront fees 🔗
  • Trusted upfront fees to mitigate jamming attacks 🔗
  • More upfront fees discussion 🔗
• Anonymity networks
  • Bitcoin Core #19954 completes the BIP155 addr v2 implementation 🔗
  • Bitcoin Core #19991 enables tracking inbound connections from onion peers 🔗
• CVEs (various)
  • CVE-2020-26895: full disclosure of on-standard signature acceptance 🔗
  • CVE-2020-26896: full disclosure of improper preimage revelation 🔗
• Generic signmessage
  • Alternative proposal for generic signmessage using virtual transactions 🔗
  • BIP322 updated to use virtual transactions 🔗
• Soft fork activation
  • Changes ‘unexpected version’ warnings implemented as part of BIP8 🔗
  • Bitcoin Core #19953 adds taproot code; activation still under discussion 🔗
• Adaptor signatures
  • Revised witness asymmetric channels proposal with signature adaptors 🔗
• Addr v2
  • Bitcoin Core #19954 implements BIP155 and Tor v3 support 🔗
• Anchor outputs
  • Eclair 0.4.2 adds experimental support for anchor outputs 🔗
• Bech32
  • Discussion about updates to BIP173 bech32 to address mutability concerns 🔗
• Hash Time Locked Contract (HTLC)
  • CVE-2020-26896: premature preimage revelation in LND 🔗
• MAST
  • What are Merklized Alternative Script Trees? 🔗
• MuSig
  • MuSig2 paper published 🔗
• Payjoin
  • BlueWallet 5.6.1 adds support for BIP78 payjoin 🔗
• Payment probes
  • Upfront fees discussion and its ability to make probing more expensive 🔗
• Payment secrets
  • CVE-2020-26896 could have been prevented by payment secrets 🔗
• Partially signed bitcoin transactions
  • LND #4389 adds a new psbt wallet subcommand for creating & signing PSBTs 🔗
• Point Time Locked Contracts (PTLCs)
  • Updated witness asymmetric channels proposal for move from HTLCs to PTLCs 🔗
• Responsible disclosures
  • Antoine Riard disclosed CVE-2020-26895 and CVE-2020-26896 allowing funds theft from LND 🔗
• Schnorr signatures
  • Bitcoin Core #19953 merged with consensus implementation of BIP340 🔗
• Signet
  • Summary of Bitcoin Core PR Review Meeting on adding signet support 🔗
• Spontaneous payments
  • Eclair 0.4.2 adds support for keysend-style spontaneous payments 🔗
• Taproot
  • Bitcoin Core #19953 merged with consensus implementation of BIP341 🔗
• Tapscript
  • Bitcoin Core #19953 merged with consensus implementation of BIP342 🔗

September 2020

• Anchor outputs
  • LND #4558 updates LND to the latest anchor outputs specification 🔗
  • LND #4606 & #4592 improve LND’s effectiveness at fee bumping anchor outputs 🔗
  • Why do anchor outputs need to enforce an nSequence of 1? 🔗
  • Eclair #1501 adds support for unilateral closes of channels using anchors 🔗
  • LND #4576 starts adding support for anchor outputs to LND’s watchtower 🔗
• Signet
  • Discussion about the parameters for a default signet 🔗
  • Discussion about the design decisions for signet 🔗
  • BIPs #983 updates BIP325 to omit signet commitments when unnecessary 🔗
  • Bitcoin Core #18267 and #19993 add support for signet 🔗
  • C-Lightning #4068 and #4078 update C-Lightning’s signet implementation 🔗
• Payment batching
  • C-Lightning #3812 adds batching support to its onchain wallet 🔗
  • C-Lightning #3763 adds new RPC to batch open channels 🔗
  • Bitcoin Core #16378 adds a new RPC to the wallet with batching support 🔗
• Eclipse attacks
  • Bitcoin Core #19670 reserves inbound slots for block-relay-only peers 🔗
  • CVE-2018-17145 InvDoS attack could’ve been used to eclipse nodes 🔗
• Hash Time Locked Contract (HTLC)
  • LND #4527 allows users to limit the maximum number of pending HTLCs 🔗
  • Stealing fees included in HTLCs created using SIGHASH_SINGLE 🔗
• Schnorr signatures
  • BIPs #982 updates BIP340 to consistently use evenness tiebreaker 🔗
  • Libsecp256k1 #558 implements schnorr signature verification and signing 🔗
• Timelocks
  • One-block relative timelocks to prevent pinning issues in coinswaps 🔗
  • Research into conflicts between timelocks and heightlocks 🔗
• Transaction pinning
  • Pinning attacks against a coinswap protocol 🔗
  • Transaction fee sponsorship proposal to attempt to eliminate pinning 🔗
• Adaptor signatures
  • Using signature adaptors for witness asymmetric payment channels 🔗
• Addr v2
  • BIPs #907 updates BIP155 messages to allow addresses up to 512 bytes 🔗
• Coinswap
  • Continued coinswap discussion focused on potential weaknesses 🔗
• CVEs (various)
  • CVE-2018-17145: full disclosure of inv out-of-memory DoS attack 🔗
• Dual funding
  • C-Lightning #3973 adds the accepter side of dual-funded channels 🔗
• Fee sponsorship
  • Transaction fee sponsorship proposal 🔗
• Hardware wallet interface (HWI)
  • HWI #363 adds support for Bitbox02 hardware wallet 🔗
• Large channels
  • LND #4567 adds a new --maxchansize parameter for large channels 🔗
• Miniscript
  • Miniscript to warn or fail for safety when mixed time/height locks used 🔗
• Payjoin
  • Joinmarket 0.7.0 adds support for BIP78 payjoin 🔗
• Partially signed bitcoin transactions
  • Joinmarket 0.7.0 adds support for PSBTs 🔗
• Point Time Locked Contracts (PTLCs)
  • Using witness asymmetric payment channels for move from HTLCs to PTLCs 🔗
• Replace-by-fee (RBF)
  • C-Lightning #3870 implements RBF scorched earth for penalty transactions 🔗
• Responsible disclosures
  • Braydon Fuller and Javed Khan report CVE-2018-17145 DoS vulnerability to devs of full nodes 🔗
• Soft fork activation
  • Conversation about segwit activation history and ideas for taproot 🔗
• Statechains
  • Transcript of discussion about multiple topics, including statechains 🔗
• Taproot
  • Discussion about taproot activation parameters 🔗

August 2020

• Anchor outputs
  • Discussion of solutions for attacks against LN, including anchor outputs 🔗
  • Eclair #1491 adds support for anchor outputs 🔗
  • C-Lightning #3830 adds experimental support for anchor outputs 🔗
  • BOLTs #688 adds support for anchor outputs to the LN protocol 🔗
• Partially signed bitcoin transactions
  • BIP174 specification of PSBT updated in response to fee overpayment attack 🔗
  • Bitcoin Core #18654 adds new RPC specifically for RBF fee bumping PSBTs 🔗
  • BIPs #955 updates BIP174 PSBT to standardize supplying hash preimages 🔗
• Miniscript
  • Minsc: a new spending policy language based on miniscript 🔗
  • PSBT specification updated to improve miniscript compatibility 🔗
• Package relay
  • Discussion of solutions for attacks against LN, including package relay 🔗
  • Change to orphan parent fetching, may be replaced by package relay 🔗
• Payment batching
  • Specter Desktop adds payment batching support 🔗
  • Field Report: How batching could have saved millions of dollars in fees 🔗
• Signet
  • BIP325 updated for new signet block signing method 🔗
  • Will the availability of signet eliminate the need for a new testnet? 🔗
• Transaction pinning
  • Discussion of attacks against LN, including transaction pinning 🔗
  • Using attacks such as transaction pinning against eltoo 🔗
• Addr v2
  • Summary of Bitcoin Core PR Review Club discussion about an addr v2 PR 🔗
• Anonymity networks
  • Bitcoin Core PR Review Club on a proposed implementation of BIP155 addr v2 🔗
• Coinswap
  • Discussion about routed coinswaps 🔗
• Compact block filters
  • Bitcoin Core #19070 allows advertising support for serving BIP157 filters 🔗
• Covenants
  • Discussion about how Simplicity could be used for covenants 🔗
• Discreet Log Contracts (DLCs)
  • Beta application announced for creating test DLC derivatives 🔗
• Dual funding
  • C-Lightning #3954 adds locktime support to PSBT RPCs for dual funding 🔗
• Eltoo
  • Using attacks like transaction pinning and selective relay against eltoo 🔗
• Large channels
  • LND 0.11.0-beta released with support for large channels by default 🔗
• MAST
  • Discussion about the evolution of MAST (and other things) into taproot 🔗
• Multipath payments
  • LND #4521 improves invoice routing hints for multipath payments 🔗
• OP_CHECKTEMPLATEVERIFY
  • Sapio: a new language for building contracts with OP_CHECKTEMPLATEVERIFY 🔗
• Payjoin
  • Wasabi adds support for BIP78 payjoin 🔗
• Schnorr signatures
  • Proposal to update BIP340 schnorr signatures to use evenness tiebreaker 🔗
• Segregated witness
  • BIPs #947 updates the BIP325 specification of signet to allow segwit-style virtual transactions 🔗
• SIGHASH_ANYPREVOUT
  • Discussion of various topics, including SIGHASH_ANYPREVOUT 🔗
• Simplicity
  • Transcript on implementing Simplicity as a taproot leaf version 🔗
• Taproot
  • Discussion of various topics, including taproot activation 🔗

July 2020

• Partially signed bitcoin transactions
  • Bitcoin Core #19215 adds additional data to PSBTs for segwit inputs 🔗
  • C-Lightning #3775 adds RPCs for creating and using PSBTs 🔗
  • Electrum 4.0.1 replaces their partial transactions format with PSBTs 🔗
  • Initial release of Lily Wallet supports PSBTs 🔗
  • Field Report: Using PSBT at River Financial 🔗
  • LND #4455 makes it safe to batch open channels using PSBTs 🔗
• Taproot
  • New chatroom for discussing taproot activation 🔗
  • Upgrading LN commitment formats, including for taproot 🔗
  • Question about leaf versions in taproot 🔗
  • Question about the different features in taproot for upgrading 🔗
  • Discussion about backporting wtxid relay for taproot activation 🔗
• Multipath payments
  • Eclair #1427 and #1439 add support to Eclair for sending multipath payments 🔗
  • Eclair 0.4.1 adds support for sending multipath payments 🔗
  • Zap 0.7.0 Beta adds support for multipath payments 🔗
  • C-Lightning #3809 adds support for sending of multipath payments 🔗
• Spontaneous payments
  • LND #4167 allows spontaneous payments made using keysend to be held 🔗
  • Zap 0.7.0 Beta adds support for spontaneous payments 🔗
  • C-Lightning #3792 adds support for sending keysend spontaneous payments 🔗
  • Eclair #1485 adds support for keysend spontaneous payments 🔗
• Coinswap
  • Presentation about coinswaps 🔗
  • Presentation about succinct atomic swaps 🔗
• Segregated witness
  • BIPs #933 adds BIP339 for transaction relay announcement using segwit wtxids 🔗
  • Bitcoin Core #18044 adds support for announcing and requesting transactions by their segwit wtxid 🔗
• Soft fork activation
  • BIPs #550 revises BIP8 to allow use without initial mandatory lock-in 🔗
  • Taproot activation discussion on mailing list and in new IRC room 🔗
• Watchtowers
  • Service proposed for storing presigned watchtower transactions 🔗
  • Presentation about watchtower protocol development 🔗
• Anchor outputs
  • Eclair #1484 adds basic support for anchor outputs 🔗
• Bech32
  • Proposed updates to BIP173 bech32 to address mutability concerns 🔗
• Channel commitment upgrades
  • Upgrading channel commitment formats 🔗
• Compact block relay
  • Consequences of not backporting taproot relay on compact block efficiency 🔗
• Eltoo
  • Upgrading LN commitment formats, including for eltoo 🔗
• HD key generation
  • Proposed BIP for BIP32 path templates 🔗
• Hold invoices
  • Zap 0.7.0 Beta adds support for hold invoices 🔗
• Hash Time Locked Contract (HTLC)
  • Discussion about the incentives to mine HTLCs 🔗
• Hardware wallet interface (HWI)
  • Initial release of Lily Wallet supports HWI 🔗
• Large channels
  • LND #4429 enables support for large channels by default 🔗
• Multisignature
  • Discussion of multisignatures and threshold signatures 🔗
• MuSig
  • Presentations and discussions about musig-style multiparty signatures 🔗
• Output script descriptors
  • Field Report: Using descriptors at River Financial 🔗
• Package relay
  • New BIP339 wtxid transaction announcements simplifies package relay 🔗
• Payjoin
  • New BIP78 specification of payjoin 🔗
• Schnorr signatures
  • Presentations and discussions about schnorr signatures 🔗
• SIGHASH_ANYPREVOUT
  • Request to replace BIP118 with the SIGHASH_ANYPREVOUT proposal 🔗
• Simplicity
  • Question about implementing taproot with Simplicity 🔗
• Statechains
  • Transcript about watchtowers and their usefulness for statechains 🔗
• Threshold signature
  • Discussion about digital signatures schemes, including threshold signatures 🔗
• Vaults
  • Service proposed for storing presigned vault transactions 🔗

June 2020

• Taproot
  • Taproot eliminates vulnerability related to segwit fee overpayment attack 🔗
  • BIP341 transaction digest amended with extra commitment to scriptPubKeys 🔗
  • Coinpool: using taproot to help create payment pools 🔗
• Coinjoin
  • Comparison of coinjoin privacy to coinswap privacy 🔗
  • WabiSabi: a protocol for coordinated coinjoins with arbitrary output values 🔗
• Eclipse attacks
  • Time dilation attack: using eclipse attacks to steal money from LN nodes 🔗
  • Bitcoin Core 0.20 released with asmap feature to improve eclipse resistance 🔗
• Payjoin
  • Comparison of payjoin privacy to coinswap privacy 🔗
  • Discussion about payjoin and its history 🔗
• Responsible disclosures
  • Saleem Rashid disclosed to Trezor an issue previously identified by Greg Sanders 🔗
  • René Pickhardt disclosed fee ransom attack affecting multiple LN implementations 🔗
• SIGHASH_ANYPREVOUT
  • Impact of SIGHASH_NOINPUT and eltoo on LN backups 🔗
  • Coinpool: using SIGHASH_NOINPUT to help create payment pools 🔗
• Adaptor signatures
  • Paying for a PTLC pointlock using an signature adaptors 🔗
• Anchor outputs
  • Anchor outputs may help mitigate LN fee ransom attack 🔗
• Anonymity networks
  • Desktop version of Blockstream Green released with Tor support 🔗
• Coinswap
  • Design for a coinswap implementation 🔗
• Compact block filters
  • Bitcoin Core #19010 & #19044 add additional messages from BIP157 🔗
• Dual funding
  • Sydney meetup discussion about LN, including dual funding 🔗
• Eltoo
  • Impact of SIGHASH_NOINPUT and eltoo on LN backups 🔗
• HD key generation
  • BIPs #910 Assigns BIP85 to the Deterministic Entropy From BIP32 Keychains proposal 🔗
• Hash Time Locked Contract (HTLC)
  • LN fee ransom attack against channels that accept too many HTLCs 🔗
• Hardware wallet interface (HWI)
  • Fix for segwit fee overpayment attack affects HWI compatibility 🔗
• Joinpools
  • CoinPool generalized privacy for identifiable onchain protocols 🔗
• Multisignature
  • Warning about using 160-bit addresses for naive multiparty multisignatures 🔗
• Partially signed bitcoin transactions
  • Bitcoin Core #18027 adds GUI support for signing & broadcasting PSBTs 🔗
• Segregated witness
  • Fee overpayment attack on multi-input segwit transactions 🔗
• Soft fork activation
  • Meetup discussion including potential soft fork activation mechanisms 🔗
• Transaction bloom filtering
  • Bitcoin Core #19260 disconnects peers who inappropriately send filterclear 🔗
• Vaults
  • Presentation of the Revault multiparty vault architecture 🔗

May 2020

• Large channels
  • C-Lightning 0.8.2 released with support for large channels 🔗
  • LND 0.10.0-beta released with the ability to create invoices over 0.043 BTC 🔗
  • C-Lightning fixes incompatibility when opening large channels with Eclair 🔗
• Multipath payments
  • LND 0.10 presentation: multipath payments 🔗
  • LND 0.10.0-beta released with support for multipath payments 🔗
  • Lightning Loop adds support for multipath payments 🔗
• Partially signed bitcoin transactions
  • LND 0.10 presentation: funding channels using PSBTs 🔗
  • LND 0.10.0-beta released with support for funding channels using PSBTs 🔗
  • C-Lightning #3738 adds initial support for creating PSBTs 🔗
• Spontaneous payments
  • C-Lightning 0.8.2 released with a plugin for sending spontaneous payments 🔗
  • Juggernaut uses spontaneous payments for messaging and instant payments” 🔗
  • Breez wallet adds support for spontaneous payments 🔗
• Taproot
  • Request for additional signature commitment to previous scriptPubKeys 🔗
  • Request for comments on amending BIP341 taproot transaction digest 🔗
  • Example sizes of multisig taproot transactions 🔗
• Schnorr signatures
  • BIP340 schnorr updated with alternative tiebreaker & nonce recommendation 🔗
  • RFC6979 nonce generation versus BIP340’s recommended procedure 🔗
• Anchor outputs
  • LND 0.10 presentation: anchor outputs 🔗
• Anonymity networks
  • Presentation on enhancements in LND 0.10, including better Tor support 🔗
• Coinjoin
  • Allowing hardware wallets to safely sign automated coinjoin transactions 🔗
• Coinswap
  • Two-transaction cross chain atomic swap or same-chain coinswap 🔗
• Compact block filters
  • Bitcoin Core #18877 adds getcfcheckpt and cfcheckpt messages 🔗
• Consensus cleanup soft fork
  • Discussion of minimum safe transaction sizes 🔗
• Child pays for parent (CPFP)
  • Copay adds support for CPFP fee bumping incoming transactions 🔗
• CVEs (various)
  • CVE-2017-12842: discussion about minimum transaction size 🔗
• Dual funding
  • C-Lightning #3738 adds initial support for PSBTs, part of dual funding 🔗
• Eclipse attacks
  • Presentation about attacking Bitcoin Core, including using eclipse attacks 🔗
• Generic signmessage
  • Simplified BIP322, only allowing signatures from one script per proof 🔗
• Output script descriptors
  • Bitcoin Core #16528 adds support for native output descriptor wallets 🔗
• Signet
  • BIP325 updated: all signets to use same genesis block but different magic 🔗
• Simplicity
  • Transcript on next generation smart contracting with Simplicity 🔗
• Timelocks
  • New cross-chain coinswap construction that only requires timelocks on one chain 🔗
• Watchtowers
  • C-Lightning #3659 adds support for watchtowers 🔗

April 2020

• Multipath payments
  • LND #3970 adds support for multipath payments to its payment lifecycle 🔗
  • LND #3967 adds support for sending multipath payments 🔗
  • Rust-Lightning #441 adds support for simplified multipath payments 🔗
• Multisignature
  • Mitigating power analysis attacks, including against multisignature schemes 🔗
  • Alternative to ECDSA multisignatures for signature adaptors 🔗
  • Implementing statechains for ECDSA using multisignatures 🔗
• Adaptor signatures
  • ECDSA signature adaptors for statechains with secure multiparty computation 🔗
  • Work on PTLCs for LN using simplified ECDSA signature adaptors 🔗
• Covenants
  • Vault prototype using pre-signed transactions 🔗
  • Demo implementation of a multisig vaults covenant prototype 🔗
• Large channels
  • C-Lightning #3612 adds support for option_support_large_channel 🔗
  • LND #4075 allows creating invoices over 0.043 BTC 🔗
• Partially signed bitcoin transactions
  • LND #4079 adds support for funding channels with PSBTs 🔗
  • Bitcoin Core #17509 allows saving and loading PSBTs from files 🔗
• Rendez-vous routing
  • C-Lightning #3600 adds experimental support for onion messages using blinded paths 🔗
  • C-Lightning #3623 adds a minimal implementation for spending payments using blinded paths 🔗
• Schnorr signatures
  • Implementing statechains without schnorr signatures 🔗
  • Mitigating differential power analysis in schnorr signatures 🔗
• Unannounced channels
  • C-Lightning #3600 adds blinded paths to improve unannounced channel privacy 🔗
  • C-Lighting #3623 improves unannounced channel privacy when routing payments 🔗
• Vaults
  • Vault prototype written in Python 🔗
  • Revault: an implementation of multiparty vaults 🔗
• Anchor outputs
  • Using anchor outputs to ensure HTLC sends can be fee bumped 🔗
• Eltoo
  • Implementing statechains without eltoo 🔗
• Generic signmessage
  • Proposed update to BIP322 generic signmessage 🔗
• HD key generation
  • Proposal for using one BIP32 keychain to seed multiple child keychains 🔗
• Hash Time Locked Contract (HTLC)
  • Using inconsistencies in node mempools to attack HTLC atomicity 🔗
• Onion messages
  • C-Lightning #3600 adds experimental support for onion messages using blinded paths 🔗
• OP_CHECKTEMPLATEVERIFY
  • Vault prototype with sample implementation using OP_CHECKTEMPLATEVERIFY 🔗
• Package relay
  • New LN attack; full solution requires package relay 🔗
• Payjoin
  • BTCPay adds support for sending and receiving payjoined payments 🔗
• Point Time Locked Contracts (PTLCs)
  • Simplified ECDSA adaptor signatures for PTLCs in LN channels 🔗
• Quantum resistance
  • Question about paying public keys directly versus hash indirection 🔗
• Reproducible builds
  • Bitcoin Core #17595 adds Guix support for Windows builds 🔗
• Signer delegation
  • Implementing statechain delegation without schnorr or eltoo 🔗
• Simplicity
  • Question about Simplicity and static analysis 🔗
• Spontaneous payments
  • C-Lightning #3611 adds a keysend plugin to support spontaneous payments 🔗
• Statechains
  • Discussion about implementing statechains without schnorr or eltoo 🔗
• Timelocks
  • Using decrementing locktimes instead of eltoo for statechains 🔗

March 2020

• Exfiltration resistant signing
  • Proposal to standardize an exfiltration resistant nonce protocol 🔗
  • Overview of anti-covert-channel signing techniques 🔗
• Schnorr signatures
  • Proposed update to schnorr key selection and signature generation 🔗
  • BIP340 schnorr signature recommendations updated for improved security 🔗
• Anchor outputs
  • LND #3821 adds draft anchor commitments support 🔗
• Anonymity networks
  • BOLTs #751 updates BOLT7 to better handled multi-network node announcements 🔗
• Eclipse attacks
  • Review club discussion of Bitcoin Core #17428 anchor connections 🔗
• Generic signmessage
  • Additional request for feedback on BIP322 generic signmessage 🔗
• Large channels
  • Eclair #1323 advertise support for channel opens over ~0.17 BTC 🔗
• Miniscript
  • Question about a specification for miniscript 🔗
• Payment batching
  • Withdrawal transactions from Coinbase now use payment batching 🔗
• Partially signed bitcoin transactions
  • Bitcoin Core #17264 includes HD derivation path in PSBTs by default 🔗
• Reproducible builds
  • Eclair #1307 updates packaging to also reproducibly build Eclair GUI 🔗
• Taproot
  • Security analysis: taproot in the generic group model 🔗
• Tapscript
  • Bitcoin Core #16902 fixes an inefficiency in OP_IF related opcodes 🔗
• Watchtowers
  • Updated watchtower BOLT specification proposal 🔗

February 2020

• Schnorr signatures
  • Safety of precomputed public keys used with schnorr signatures 🔗
  • BIP340 alternative x-only pubkey tiebreaker and tagged hash 🔗
  • Discussion about taproot versus other schnorr-enabling proposals 🔗
• Taproot
  • btcdeb adds tap command for experimenting with taproot and tapscript 🔗
  • Discussion about taproot versus alternatives 🔗
  • Taproot security from quantum computing threats 🔗
• Adaptor signatures
  • Taproot privacy gains, including those from signature adaptors 🔗
  • Boomerang contracts using signature adaptors for LN latency & throughput 🔗
• Anonymity networks
  • CKBunker allows specifying spending conditions for a Tor-enabled Coldcard 🔗
  • Eclair #1278 allows users to skip using SSL when using an onion service 🔗
• Dual funding
  • Interactive construction of funding transactions 🔗
  • Using PoDLE in LN for dual funding privacy protection 🔗
• Fee sniping
  • Suggestion to use anti fee sniping for interactive LN funding transactions 🔗
  • C-Lightning #3465 implements anti fee sniping for withdrawal transactions 🔗
• Multipath payments
  • Eclair 0.3.3 adds support for multipath payments 🔗
  • Boomerang: improving latency and throughput with multipath payments 🔗
• Atomic multipath payments (AMPs)
  • LND #3957 adds code useful for Atomic Multipath Payments (AMP) support 🔗
• Channel jamming attacks
  • Reverse upfront fees to mitigate jamming 🔗
• Covenants
  • OP_CHECKTEMPLATEVERIFY workshop report 🔗
• Eclipse attacks
  • Bitcoin Core #16702 chooses peers based on ASN instead of IP address 🔗
• Hold invoices
  • Reverse up-front payments could improve hold invoice cost spreading 🔗
• Hardware wallet interface (HWI)
  • BTCPay Vault using HWI for signing 🔗
• Large channels
  • BOLTs #596 updates BOLT2 to allow channel opens over ~0.17 BTC 🔗
• MAST
  • Discussion about taproot versus alternative MAST-enabling proposals 🔗
• Offers
  • New direct messages protocol to be used for offers 🔗
• Onion messages
  • Proposal for LN direct messages 🔗
• OP_CHECKTEMPLATEVERIFY
  • OP_CHECKTEMPLATEVERIFY workshop summary 🔗
• Output script descriptors
  • Bitcoin Core #18032 add descriptor field to multisig address RPCs 🔗
• Payment batching
  • OP_CHECKTEMPLATEVERIFY discussion about compressed payment batching 🔗
• Payment probes
  • Discussion about preventing UTXO probing in interactively constructed LN funding transactions 🔗
• Partially signed bitcoin transactions
  • CKBunker using PSBTs for an HSM 🔗
• Quantum resistance
  • Question about whether taproot create security risk from quantum threats? 🔗
• Rendez-vous routing
  • Decoy nodes and lightweight rendez-vous routing (blinded paths) 🔗
• Reproducible builds
  • Eclair #1295 allows the eclair-core module to be reproducibly built 🔗
• Side channels
  • Presentation: Remote Side-Channel Attacks on Anonymous Transactions 🔗
• Soft fork activation
  • OP_CHECKTEMPLATEVERIFY workshop discussion about activation mechanisms 🔗
• Spontaneous payments
  • Eclair 0.3.3 adds experimental support for trampoline payments 🔗
• Tapscript
  • btcdeb adds tap command for experimenting with taproot and tapscript 🔗
• Vaults
  • OP_CHECKTEMPLATEVERIFY (CTV) workshop discussion: using CTV with vaults 🔗

January 2020

• Unannounced channels
  • C-Lightning #3351 enhances invoice RPC for private channels 🔗
  • Eclair #1283 allows multipath payments to traverse unannounced channels 🔗
  • Breaking the link between UTXOs and unannounced channels 🔗
• Coinjoin
  • Evaluation of coinjoins without equal value inputs or outputs 🔗
  • Wormhole: a protocol for sending payments as part of a chaumian coinjoin 🔗
• Multipath payments
  • Eclair #1283 allows multipath payments to traverse unannounced channels 🔗
  • LND 0.9.0-beta adds support for receiving multipath payments 🔗
• Output linking
  • Bitcoin Core #17621 fixes potential privacy leak in the avoid_reuse flag 🔗
  • Bitcoin Core #17843 fixes balance discrepancy related to avoid_reuse flag 🔗
• Partially signed bitcoin transactions
  • Bitcoin Core #16373 allows the bumpfee RPC used for RBF to return a PSBT 🔗
  • Bitcoin Core #17492 allows the wallet GUI to place a PSBT in the clipboard 🔗
• Anchor outputs
  • LND #3829 updates code & documentation to simplify adding anchor outputs 🔗
• Discreet Log Contracts (DLCs)
  • Drafting of an interoperability specification for DLCs 🔗
• Eltoo
  • Modification to SIGHASH_ANYPREVOUTANYSCRIPT to improve eltoo flexibility 🔗
• HD key generation
  • Question: why was the BIP32 fingerprint used for BIP174 PSBT? 🔗
• Multisignature
  • BIPs #876 assigns BIP340 to new multisignature compatible scheme 🔗
• OP_CHECKTEMPLATEVERIFY
  • BIPs #875 assigns BIP119 to the OP_CHECKTEMPLATEVERIFY proposal 🔗
• Output script descriptors
  • Encoded descriptors (e.g., with base64) 🔗
• Payment batching
  • Non-equal value coinjoins could look like batching for improved privacy 🔗
• Replace-by-fee (RBF)
  • Bitcoin Core #16373 allows the bumpfee RPC used for RBF to return a PSBT 🔗
• SIGHASH_ANYPREVOUT
  • Modification to SIGHASH_ANYPREVOUTANYSCRIPT to improve eltoo flexibility 🔗
• Soft fork activation
  • Mailing list discussion of soft fork activation methods 🔗
• Taproot
  • Final organized review, presentation slides, and LN integration ideas 🔗
• Uneconomical outputs
  • LND #3809 adds a force parameter to the BumpFee RPC so that it can spend uneconomical UTXOs 🔗

December 2019

• Bech32
  • LND #3767 rejects malformed BOLT11 invoices with a valid bech32 checksum 🔗
  • Proposed plan to deal with bech32 malleability in variable-length addresses 🔗
  • Analysis of bech32 error detection capability 🔗
  • 2019 year-in-review: bech32 mutability 🔗
• Covenants
  • OP_CHECKOUTPUTSHASHVERIFY renamed OP_CHECKTEMPLATEVERIFY and updated 🔗
  • Suggested changes to OP_CHECKTEMPLATEVERIFY proposal 🔗
  • 2019 year-in-review: OP_CHECKTEMPLATEVERIFY 🔗
• Multipath payments
  • Multiple LN implementations add multipath payment support 🔗
  • Basic multipath payment support added to LN specification 🔗
  • 2019 year-in-review: multipath payments 🔗
• Payment secrets
  • C-Lightning #3259 adds payment secrets to prevent multipath probing 🔗
  • LND #3788 adds support for “payment addresses” (payment secrets) 🔗
  • BOLTs #643 adds payment secrets to LN specification 🔗
• Watchtowers
  • Watchtower BOLT specification proposed 🔗
  • Discussion about watchtowers for eltoo payment channels 🔗
  • 2019 year-in-review: watchtowers 🔗
• Eclipse attacks
  • Discussion of eclipse attacks on LN nodes 🔗
  • 2019 year-in-review: erlay and other P2P improvements 🔗
• OP_CHECKTEMPLATEVERIFY
  • OP_CHECKTEMPLATEVERIFY (CTV) replaces COSHV proposal; concerns restated 🔗
  • 2019 year-in-review: OP_CHECKTEMPLATEVERIFY 🔗
• Tapscript
  • Discussion about position commitments using signature-checking opcodes 🔗
  • 2019 year-in-review: taproot and tapscript 🔗
• Anchor outputs
  • 2019 year-in-review: anchor outputs 🔗
• Anonymity networks
  • C-Lightning #3155 adds option to use a static onion service address 🔗
• AssumeUTXO
  • 2019 year-in-review: AssumeUTXO 🔗
• BIP70 payment protocol
  • 2019 year-in-review: Bitcoin Core BIP70 deprecation and disablement 🔗
• Coinjoin
  • 2019 year-in-review: SNICKER 🔗
• Consensus cleanup soft fork
  • 2019 year-in-review: consensus cleanup soft fork proposal 🔗
• Erlay
  • 2019 year-in-review: erlay 🔗
• HD key generation
  • Question: what is the max allowed depth for BIP32 derivation paths? 🔗
• Hash Time Locked Contract (HTLC)
  • Using eclipse attacks against nodes to prevent correct HTLC processing 🔗
• Hardware wallet interface (HWI)
  • 2019 year-in-review: HWI 🔗
• Miniscript
  • 2019 year-in-review: miniscript 🔗
• Multisignature
  • Discussion about nested and composable multisignature schemes 🔗
• MuSig
  • Composable MuSig—concerns about safely using signer sub-groups 🔗
• OP_CODESEPARATOR
  • Discussion of OP_CODESEPARATOR design for proposed tapscript soft fork 🔗
• Payment probes
  • C-Lightning #3259 adds support for payment secrets designed to resist recipient probing 🔗
• Reproducible builds
  • 2019 year-in-review: reproducible builds 🔗
• SIGHASH_ANYPREVOUT
  • 2019 year-in-review: SIGHASH_ANYPREVOUT 🔗
• Signet
  • 2019 year-in-review: signet 🔗
• Taproot
  • 2019 year-in-review: taproot 🔗
• Trampoline payments
  • 2019 year-in-review: trampoline payments 🔗
• Vaults
  • 2019 year-in-review: vaults without covenants 🔗

November 2019

• Multipath payments
  • LND #3499 extends several RPCs to support tracking multipath payments 🔗
  • Eclair #1153 adds experimental support for multipath payments 🔗
  • LND #3442 preparatory PR adding features necessary for multipath payments 🔗
• Bech32
  • How does the bech32 length-extension mutation weakness work? 🔗
  • Impact of bech32 length-change mutability on v1 segwit script length 🔗
• Coin selection
  • Bitcoin Core PR#17290 coin selection for customized transactions 🔗
  • Bitcoin Core 0.19 adds wallet flag to avoid address reuse privacy loss 🔗
• Compact block filters
  • Bitcoin Core 0.19 released with RPC support for BIP158 block filters 🔗
  • Maximum number of block filters per request increased from 100 to 1,000 🔗
• CPFP carve out
  • Continued discussion of LN anchor outputs using CPFP carve-out 🔗
  • Bitcoin Core 0.19 released with CPFP carve-out 🔗
• Taproot
  • Impact of bech32 length-change mutablity on v1 segwit script length 🔗
  • Blog post about x-only schnorr pubkeys 🔗
• Addr v2
  • Proposed per-node signaling for address relay with v2 addr messages 🔗
• Anchor outputs
  • Continued discussion of LN anchor outputs 🔗
• BIP70 payment protocol
  • Bitcoin Core 0.19 released with BIP70 support disabled by default 🔗
• Channel jamming attacks
  • Hashcash and refund-based upfront fees to mitigate jamming 🔗
• CVEs (various)
  • CVE-2017-18350: full disclosure of SOCKS proxy vulnerability 🔗
• Erlay
  • Erlay-compatible transaction reconciliation protocol published as BIP330 🔗
• Low-r grinding
  • C-Lightning #3220 begins always creating signatures with a low r value 🔗
• Multisignature
  • Work on schnorr multisignature schemes that require reduced interactivity 🔗
• MuSig
  • MuSig and attacks based on Wagner’s algorithm 🔗
• Offers
  • New proposed BOLT for offers protocol 🔗
• Output linking
  • Bitcoin Core 0.19 new feature: avoid_reuse wallet flag 🔗
• Partially signed bitcoin transactions
  • Range of identifiers allocated to proprietary PSBT extensions 🔗
• Schnorr signatures
  • Blog post about x-only pubkeys for use in schnorr signature schemes 🔗
• Signet
  • Signet protocol published as BIP325 🔗
• Trampoline payments
  • Eclair #1209 adds experimental support for trampoline onion format 🔗
• Transaction bloom filtering
  • Bitcoin Core 0.19 released with bloom filters disabled 🔗

October 2019

• Schnorr signatures
  • Update on changes to schnorr, taproot, and tapscript 🔗
  • Talk summary: the quest for practical threshold Schnorr signatures 🔗
  • Announcement of structured taproot review (including schnorr) 🔗
  • Bitcoin Optech schnorr/taproot workshop 🔗
• Taproot
  • Update on changes to schnorr, taproot, and tapscript 🔗
  • Announcement of structured taproot review 🔗
  • Bitcoin Optech schnorr/taproot workshop 🔗
• Tapscript
  • Update on changes to schnorr, taproot, and tapscript 🔗
  • Announcement of structured taproot review (including tapscript) 🔗
  • Bitcoin Optech schnorr/taproot workshop 🔗
• Anchor outputs
  • LN simplified commitments discussion 🔗
• Anonymity networks
  • Blockstream Green built-in Tor support for both iOS and Android 🔗
• BIP70 payment protocol
  • Bitcoin Core PR#17165 removes support for BIP70 payment protocol 🔗
• CPFP carve out
  • LN simplified commitments using CPFP carve-out 🔗
• CVE-2018-17144
  • Talk summary: Near misses: what could have gone wrong 🔗
• Default minimum transaction relay feerates
  • Bitcoin Core #16507 fixes a rounding issue related to the minimum relay feerate 🔗
• Erlay
  • Draft BIP for enabling Erlay compatibility 🔗
• MuSig
  • Schnorr signatures and musig 🔗
• Output script descriptors
  • Descriptors extended with sortedmulti 🔗
• Quantum resistance
  • Question about whether hashing pubkeys really provides quantum resistance? 🔗
• SIGHASH_ANYPREVOUT
  • Continued discussion of noinput/anyprevout 🔗
• Threshold signature
  • Talk summary: The quest for practical threshold Schnorr signatures 🔗

September 2019

• Adaptor signatures
  • Presentation: Blockchain design patterns: Layers and scaling approaches 🔗
• BIP70 payment protocol
  • Bitcoin Core PR#15584 disables support for BIP70 by default 🔗
• Coinjoin
  • Simple Non-Interactive Coinjoin with Keys for Encryption Reused (SNICKER) 🔗
• CPFP carve out
  • Bitcoin Core #16421 merged allowing carve outs to be RBF replaced 🔗
• Child pays for parent (CPFP)
  • Refactor preparing for ancestor relay 🔗
• Eclipse attacks
  • Preventing eclipse attacks using block-relay-only connections 🔗
• Eltoo
  • Eltoo demo implementation 🔗
• Hold invoices
  • LND #3390 simplifies hold invoice logic by separate HTLC tracking 🔗
• Multipath payments
  • LND #3390 separates tracking of HTLCs from invoices as necessary for SMP 🔗
• Multisignature
  • Talk about how taproot enables scaling when used with multisignatures 🔗
• Package relay
  • Bitcoin Core #16400 refactors code in anticipation of package relay 🔗
• Signet
  • Eltoo demo implementation using custom signet 🔗
• Taproot
  • Suggested removal of P2SH address wrapper from taproot proposal 🔗
• Tapscript
  • Tapscript resource limits 🔗
• Unannounced channels
  • Talk about LN topology and lack of public info about unannounced channels 🔗
• Watchtowers
  • Watchtower storage costs 🔗

August 2019

• Transaction bloom filtering
  • Bitcoin Core PR#16248 adds bloom filter whitelist option 🔗
  • BRD field report: using native segwit addresses with bloom filters 🔗
• Covenants
  • Bitcoin vaults without covenants 🔗
• Hash Time Locked Contract (HTLC)
  • C-Lightning #2858 limits the maximum number of pending HTLCs to limit costs 🔗
• Miniscript
  • Miniscript request for comments 🔗
• Payment probes
  • BOLTs #608 provides a privacy update to BOLT4 to probe channels for the ultimate recipient 🔗
• Partially signed bitcoin transactions
  • Modifying BIP174 for extensibility 🔗
• Replace-by-fee (RBF)
  • Compatibility matrix—Replace by Fee 🔗
• Schnorr signatures
  • Proposed change to schnorr pubkeys 🔗
• Signet
  • C-Lightning 0.7.2.1 released with support for signet 🔗
• Soft fork activation
  • Activation heights for previous soft forks hardcoded into Bitcoin Core 🔗
• Trampoline payments
  • BOLT PR and discussion about trampoline payments 🔗
• Vaults
  • Bitcoin vaults without covenants & weaknesses in previous vault proposals 🔗

July 2019

• Generic signmessage
  • Bitcoin Core PR opened for BIP322 signmessage support 🔗
  • Searching for a bech32 signmessage format 🔗
• HD key generation
  • BIPs #784 updates BIP174 PSBTs to include a BIP32 xpub 🔗
  • Question about BIP32 extended pubkeys (xpubs) versus ypubs and zpubs 🔗
• Just-in-time (JIT) routing
  • Free rebalancing for JIT routing 🔗
  • Additional JIT routing discussion 🔗
• Signet
  • Progress on signet 🔗
  • C-Lightning adds support for signet 🔗
• Transaction bloom filtering
  • Bitcoin Core PR#16152 disables bloom filter support by default 🔗
  • Mailing list discussion about disabling bloom filters in Bitcoin Core 🔗
• Addr v2
  • Version 2 addr message assigned BIP155 🔗
• Anonymity networks
  • BIPs #766 assigns BIP155 to the addr v2 proposal for v3 onion addresses 🔗
• Coinjoin
  • Fidelity bonds for imporoved sybil resistance in distributed coinjoin 🔗
• Compact block filters
  • BIP157 bandwidth higher than BIP37 bloom filters 🔗
• CPFP carve out
  • Bitcoin Core #15681 merged with CPFP carve out 🔗
• Hash Time Locked Contract (HTLC)
  • Stuckless Payments: idea for HTLCs that can be revoked prior to acceptance 🔗
• MuSig
  • LN gossip update proposal to use MuSig 🔗
• Partially signed bitcoin transactions
  • Update to the utxoupdatepsbt RPC in Bitcoin Core 🔗
• Reproducible builds
  • Merged PR for reproducible build of Bitcoin Core using GNU Guix 🔗
• Schnorr signatures
  • Executive briefing: the next soft fork 🔗
• Sidechains
  • Notable changes: BIP301 🔗
• Tapscript
  • BIP322 signmessage forward compatibility 🔗
• Timelocks
  • Fidelity bonds based on long-term timelocks 🔗
• Watchtowers
  • LND 0.7.0-beta release with initial watchtower support 🔗

June 2019

• Replace-by-fee (RBF)
  • Proposal to override some BIP125 RBF conditions 🔗
  • LND adds support for RBF fee bumping 🔗
  • Bitcoin Core removes mempoolreplacement configuration option 🔗
• MuSig
  • Optech executive briefing: the next soft fork 🔗
  • Breaking Bitcoin presentation: secure protocols on bip-taproot 🔗
• OP_CHECKTEMPLATEVERIFY
  • COSHV proposal replaced 🔗
  • Potential script changes, including new COSHV opcode 🔗
• Threshold signature
  • Talk summary: Secure Protocols on bip-taproot / threshold sigs with MuSig 🔗
  • Cryptographic Vulnerabilities in Threshold Wallets 🔗
• Anonymity networks
  • Bitcoin Core #15651 always binds to the default port when listening on Tor 🔗
• AssumeUTXO
  • CoreDev.tech demo and discussion of assumeutxo 🔗
• Coin selection
  • Bitcoin Core PR#13756 adds flag to avoid address reuse privacy loss 🔗
• Consensus cleanup soft fork
  • CoreDev.tech discussion: cleanup soft fork 🔗
• Countersign
  • CoreDev.tech meetings: v2 P2P transport and countersign 🔗
• Covenants
  • CoreDev.tech discussion: potential script changes 🔗
• CPFP carve out
  • Proposal to override some BIP125 conditions, alternative to carve out 🔗
• Child pays for parent (CPFP)
  • LND #3140 adds support for RBF and CPFP fee bumping sweep transactions 🔗
• Dandelion
  • Erlay compatible with BIP156 🔗
• Eclipse attacks
  • Differentiating peers based on ASN instead of address prefix 🔗
• Erlay
  • Erlay proposed 🔗
• Hardware wallet interface (HWI)
  • CoreDev.tech discussions: HWI integration into Bitcoin Core 🔗
• OP_CHECKSIGFROMSTACK
  • Discussion of potential script changes, including OP_CSFS 🔗
• Output linking
  • Bitcoin Core #13756 adds avoid_reuse wallet flag 🔗
• Quantum resistance
  • Bitcoin Core contributor meeting transcripts: taproot quantum discussion 🔗
• Reproducible builds
  • Breaking Bitcoin summaries: Bitcoin build system security 🔗
• Side channels
  • Presentation: Extracting Seeds from Hardware Wallets 🔗
• Signet
  • CoreDev.tech discussion: signet 🔗
• Spontaneous payments
  • Using ECDH for uncoordinated LN payments 🔗
• Statechains
  • Bitcoin Core contributor meeting discussion topic: blind statechains 🔗
• Taproot
  • Executive briefing: the next soft fork 🔗
• Tapscript
  • Executive briefing: Taproot and Tapscript 🔗
• Transaction pinning
  • Proposal to override some BIP125 RBF conditions to avoid pinning 🔗
• Utreexo
  • Utreexo Q&A session at CoreDev.Tech 🔗
• Version 2 P2P transport
  • CoreDev.tech discussion of v2 P2P transport proposal 🔗
• Watchtowers
  • LND PR #3133 adding support for altruist watchtowers 🔗

May 2019

• Taproot
  • Reducing taproot commitment size 🔗
  • Overview of Taproot and Tapscript 🔗
  • Extended summary of bip-taproot and bip-tapscript 🔗
• OP_CHECKTEMPLATEVERIFY
  • Proposed new opcode for transaction output commitments 🔗
  • Detailed summary: proposed transaction output commitments 🔗
• Payment batching
  • Presentation: A Return to Fees, covering techniques including batching 🔗
  • Proposed new opcode to make batching more efficient during fee spikes 🔗
• SIGHASH_ANYPREVOUT
  • New proposed SIGHASH_ANYPREVOUT mode 🔗
  • Criticism of SIGHASH_ANYPREVOUT and a generic alternative 🔗
• Tapscript
  • Extended summary of bip-taproot and bip-tapscript 🔗
  • Overview of Taproot and Tapscript 🔗
• Covenants
  • New proposed opcode: OP_CHECKOUTPUTSHASHVERIFY 🔗
• CVEs (various)
  • CVE-2012-2459: part of motivation for taproot tagged hashes 🔗
• Eltoo
  • SIGHASH_ANYPREVOUT proposal compatible with Eltoo 🔗
• HD key generation
  • Suggestion to include BIP32 derivation paths in BIP174 PSBTs 🔗
• Hash Time Locked Contract (HTLC)
  • Example of using taproot/tapscript with HTLCs 🔗
• Hardware wallet interface (HWI)
  • Bitcoin Core 0.18 with basic hardware signer support 🔗
• MAST
  • Overview of Taproot and it’s MAST-based encumbrances 🔗
• Miniscript
  • Final stack empty, insights from miniscript development 🔗
• OP_CHECKSIGFROMSTACK
  • Criticism of OP_COSHV and SIGHASH_ANYPREVOUT; OP_CSFS as alternative 🔗
• Pay-to-Contract (P2C) protocols
  • Eclair #965 allows specifying custom preimages, which can be used with pay-to-contract 🔗
• Partially signed bitcoin transactions
  • PSBT enhancements included in Bitcoin Core 0.18 🔗
• Reproducible builds
  • New reproducibly-build architecture and Snap packages for Bitcoin Core 🔗
• Soft fork activation
  • Draft taproot proposal deliberately omits activation mechanism 🔗

April 2019

• Segregated witness
  • Question: Are there still miners or mining pools which refuse to implement SegWit? 🔗
  • Bitcoin Core #14039 causes Bitcoin Core to reject legacy transactions encoded as segwit 🔗
  • Bitcoin Core #15846 relays and mines transactions paying any segwit address version 🔗
• Uneconomical outputs
  • Question: how does LN handle dust and uneconomical payments? 🔗
  • Question: how was the dust limit chosen? 🔗
• AssumeUTXO
  • Assume valid discussion 🔗
• Compact block filters
  • Basic BIP158 support merged into Bitcoin Core 🔗
• Hold invoices
  • C-Lightning #2540 adds hook allowing plugins to implement hold invoices 🔗
• Hash Time Locked Contract (HTLC)
  • Question about whether HTLCs are cost effective for micropayments 🔗
• Sidechains
  • Elements Project bech32-like addresses 🔗
• Trampoline payments
  • Trampoline payments for LN 🔗

March 2019

• Consensus cleanup soft fork
  • Cleanup soft fork proposal 🔗
  • Consensus cleanup background 🔗
  • Consensus cleanup discussion: codeseparator & sighash types 🔗
• CVEs (various)
  • CVE-2012-2459: related to new Bitcoin Core vulnerability disclosure 🔗
  • CVE-2017-12842: merkle tree fix proposed in consensus cleanup soft fork 🔗
  • CVE-2013-2292: poor tx verification performance inspires consensus cleanup 🔗
• OP_CODESEPARATOR
  • Proposed consensus cleanup soft fork: prevent use of OP_CODESEPARATOR 🔗
  • Consensus cleanup background: legacy transaction verification 🔗
  • Discussion about cleanup soft fork: concerns about OP_CODESEPARATOR 🔗
• Addr v2
  • Version 2 addr message proposed 🔗
• Anonymity networks
  • BIP for new address relay message to support Tor v3 onion addresses 🔗
• ASICBoost
  • Bitcoin Core #15471 removes warning falsely triggered by use of overt ASICBoost 🔗
• Bech32
  • Bech32 sending support (24-part series) 🔗
• Block explorers
  • Esplora updated 🔗
• Hold invoices
  • LND #2022 merged adding support for hold invoices 🔗
• Hash Time Locked Contract (HTLC)
  • Lightning Loop: new tool using HTLCs for onchain/offchain swaps 🔗
• MuSig
  • Extensions to PSBTs to help make them compatible with advanced protocols 🔗
• Output linking
  • Esplora block explorer updated with privacy warning against address reuse 🔗
• Pay-to-Contract (P2C) protocols
  • Proposal to add extension fields to PSBTs for pay-to-contract 🔗
• Partially signed bitcoin transactions
  • Discussion of PSBT extension fields 🔗
• SIGHASH_ANYPREVOUT
  • Discussion about increasing SIGHASH_NOINPUT_UNSAFE safety 🔗
• Signet
  • Feedback requested on signet 🔗
• Soft fork activation
  • Consensus cleanup soft fork proposal (plans for BIP9 activation) 🔗
• Timelocks
  • Lightning Loop announce, using submarine swaps with onchain timelocks 🔗
• Version 2 P2P transport
  • Announcement of v2 P2P transport proposal 🔗
• Watchtowers
  • LND PR #2618 implementing private watchtower support 🔗

February 2019

• Adaptor signatures
  • libsecp256k1-zkp library updated with support for signature adaptors 🔗
  • Q&A: what’s the difference between taproot and signature adaptors? 🔗
• Anonymity networks
  • Eclair #736 adds support for using and becoming an onion service 🔗
• BIP70 payment protocol
  • Bitcoin Core PR#15063 allows falling back to BIP21 parsing of BIP72 URIs 🔗
• Channel factories
  • Discussion of output tagging and its effect on eltoo and channel factories 🔗
• Dandelion
  • PRs that need more review or development 🔗
• Hardware wallet interface (HWI)
  • Bitcoin Core preliminary hardware wallet support 🔗
• MAST
  • It should be possible to upgrade miniscript for things like MAST 🔗
• Miniscript
  • Miniscript presentation 🔗
• MuSig
  • Libsecp256k1-zkp supports MuSig key and signature aggregation 🔗
• Output script descriptors
  • Descriptor checksum support added 🔗
• Partially signed bitcoin transactions
  • Three new Bitcoin Core RPCs for managing PSBTs 🔗
• Replace-by-fee (RBF)
  • RBF in the wild (survey of RBF usage) 🔗
• Reproducible builds
  • Notable Bitcoin Core PRs: reproducible builds using GNU Guix 🔗
• SIGHASH_ANYPREVOUT
  • Tagging outputs to increase safety of SIGHASH_NOINPUT_UNSAFE 🔗
• Soft fork activation
  • Presentation about probabilistic soft fork activation (“sporks”) 🔗
• Utreexo
  • Exploring accumulators 🔗

January 2019

• Unannounced channels
  • C-Lightning #2230 adds a private flag to the listpeers RPC 🔗
  • C-Lightning #2234 adds route hints for private channels to invoice RPC 🔗
• Watchtowers
  • LND PR #2448 adding a standalone watchtower 🔗
  • LND PR #2439 adding a default policy for the watchtower 🔗
• Dandelion
  • What’s the BIP156 hold-up in Bitcoin Core? 🔗
• Eltoo
  • Optimization for Eltoo-based payment channels 🔗
• MAST
  • Should OP_CODESEPARATOR be disabled in MAST scripts? 🔗
• OP_CODESEPARATOR
  • Should OP_CODESEPARATOR be included in future Script language upgrades? 🔗
• Output linking
  • Weak signature nonces discovered in reused addresses 🔗
• Payjoin
  • Mailing list discussion about BIP79 Bustapay 🔗
• Payment probes
  • Eclair 🔗
• Segregated witness
  • Bitcoin Core #14811 updates the getblocktemplate RPC to require that the segwit flag be passed 🔗
• SIGHASH_ANYPREVOUT
  • SIGHASH_NOINPUT_UNSAFE edge cases 🔗
• Spontaneous payments
  • LND PR for spontaneous LN payments 🔗
• Static channel backups
  • LND #2370 now updates a channel.backup file each time a new channel is opened or closed 🔗

December 2018

• Minisketch
  • 2018 year-in-review: research into reducing transaction relay data 🔗
  • Minisketch library released with implications for Bitcoin and LN 🔗
• Taproot
  • Taproot (major developments of 2018, January) 🔗
  • What a taproot soft fork might look like 🔗
• Block explorers
  • Modern open source block explorer 🔗
• Channel factories
  • 2018 year-in-review: eltoo lays groundwork for channel factories 🔗
• Countersign
  • 2018 year-in-review: untrackable authentication 🔗
• CPFP carve out
  • CPFP carve out proposal 🔗
• Child pays for parent (CPFP)
  • CPFP carve-out proposed 🔗
• CVE-2018-17144
  • 2018 year-in-review: CVE-2018-17144 🔗
• CVEs (various)
  • CVE-2017-12842: vulnerability in Bitcoin SPV proofs 🔗
• Dandelion
  • 2018 year-in-review notable developments: BIP156 Dandelion 🔗
• Eltoo
  • 2018 year-in-review: Eltoo 🔗
• Generic signmessage
  • 2018 year-in-review: initial discussion that became BIP322 🔗
• MAST
  • Taproot: an optimization for MAST 🔗
• MuSig
  • 2018 year-in-review: publication of MuSig protocol 🔗
• Package relay
  • CPFP carve out suggested but package relay needed for completeness 🔗
• Payjoin
  • 2018 year-in-review: Pay-to-EndPoint (P2EP) 🔗
• Payment batching
  • 2018 year-in-review: about 11% of payments used batching 🔗
• Replace-by-fee (RBF)
  • 2018 year-in-review: transaction statistics 🔗
• Responsible disclosures
  • Sergio Demian Lerner disclosed CVE-2017-12842 which allows stealing from SPV wallets 🔗
• SIGHASH_ANYPREVOUT
  • 2018 year-in-review: SIGHASH_NOINPUT 🔗
• Splicing
  • 2018 year-in-review: splicing 🔗
• Timelocks
  • Transaction pinning as a major challenge for protocols involving timelocks 🔗
• Transaction pinning
  • Eltoo may not be entirely reliable because of transaction pinning 🔗

November 2018

• Liquidity advertisements
  • Proposal for nodes to advertise liquidity 🔗
  • Allowing dual funding for liquidity management 🔗
• Segregated witness
  • Temporary reduction in segwit block production 🔗
  • Bitcoin Core #14454 adds support to the importmulti RPC for segwit addresses and scripts 🔗
• Adaptor signatures
  • Discussion about problems in LN solvable using signature adaptors 🔗
• Anchor outputs
  • Simplified fee bumping for LN 🔗
• Atomic multipath payments (AMPs)
  • LN protocol 1.1 goals: multipath payments 🔗
• Bech32
  • Bech32 security update for C implementations 🔗
• Child pays for parent (CPFP)
  • Simplified fee bumping for LN 🔗
• Dual funding
  • LN protocol specification 1.1 goals: dual funding 🔗
• Large channels
  • LN 1.1 specification meeting: wumbo channels and payments proposal 🔗
• Multipath payments
  • LN protocol 1.1 goals: multipath payments 🔗
• Payment probes
  • Making path probing more convenient 🔗
• Rendez-vous routing
  • Lightning Network protocol 1.1 goals: hidden destinations 🔗
• Responsible disclosures
  • Trezor team disclosed a bug in the C-language bech32 specification affecting multiple wallets 🔗
• SIGHASH_ANYPREVOUT
  • Proposal included additional data in sighashes 🔗
• Splicing
  • LN 1.1 protocol goals 🔗
• Transaction pinning
  • What is transaction pinning? 🔗
• Unannounced channels
  • LND #1944 tweaks sendtoroute RPC to allow routing via private channels 🔗
• Watchtowers
  • LND PR #2124 adding support for detecting and using onchain spends 🔗

October 2018

• Adaptor signatures
  • Multiparty ECDSA for scriptless LN channels 🔗
  • Fast multiparty ECDSA compatible with signature adaptors 🔗
• Multisignature
  • ECDSA multisignatures for scriptless Lightning Network payment channels 🔗
  • Two papers published on fast ECDSA multisignatures 🔗
• Threshold signature
  • Paper published about ECDSA threshold signatures 🔗
  • Pairing-based threshold signatures with signer auditability 🔗
• ASICBoost
  • Overt ASICBoost support for S9 miners 🔗
• BIP70 payment protocol
  • Bitcoin Core PR#14451 allows building Bitcoin-Qt without BIP70 support 🔗
• Covenants
  • Scaling Bitcoin Tokyo 2018, Script Roundtable: OP_CHECKSIGFROMSTACK 🔗
• CVE-2018-17144
  • CVE-2018-17144 exploited on testnet 🔗
• Fee sniping
  • LND #2063 updates sweeper to use nLockTime anti fee sniping 🔗
• HD key generation
  • Bitcoin Core #14150 adds key origin support to descriptors for tracking BIP32 xpubs 🔗
• OP_CHECKSIGFROMSTACK
  • Discussion: the evolution of Bitcoin Script, OP_CSFS discussion 🔗
• Output script descriptors
  • Key origin support 🔗
• Point Time Locked Contracts (PTLCs)
  • Talk about implementing 2p-ECDSA for LN funding and PTLCs 🔗
• SIGHASH_ANYPREVOUT
  • Discussion of the evolution of script: SIGHASH_NOINPUT_UNSAFE 🔗
• Splicing
  • Proposals for LN splicing 🔗
• Utreexo
  • CoreDev.Tech summaries: Utreexo 🔗
• Watchtowers
  • LND PRs #1535 and #1512 adding server-side communication for watchtowers 🔗

September 2018

• CVE-2018-17144
  • Upgrade to Bitcoin Core 0.16.3 to fix DoS vulnerability 🔗
  • Upgrade to Bitcoin Core 0.16.3 to fix CVE-2018-17144 🔗
  • Information about CVE-2018-17144 🔗
• Coinjoin
  • Sighash updates that can help hardware wallets participate in coinjoins 🔗
  • Question about Wasabi coinjoin mixing and exchange blacklisting 🔗
• Responsible disclosures
  • Awemany disclosed CVE-2018-17144 as a DoS vulnerability in Bitcoin Core 🔗
  • Bitcoin Core developers quietly fix bug allowing invalid bitcoins after DoS report from Awemany 🔗
• Anonymity networks
  • LND #1516 adds support for automatically setting up a v3 onion service 🔗
• Default minimum transaction relay feerates
  • Bitcoin Core #13987 adds info about peers’ minimum feerates to getpeerinfo 🔗
• Generic signmessage
  • BIP322 proposed 🔗
• Payjoin
  • Bustapay discussion (simplified alternative to P2EP) 🔗
• Quantum resistance
  • BIP151 discussion, including about NewHope quantum-resistant key exchange 🔗
• Timelocks
  • For BIP322 generic signed messages, unclear how to support timelocks 🔗
• Version 2 P2P transport
  • Criticism and defense of BIP151 choices 🔗

August 2018

• Version 2 P2P transport
  • Continuing work on P2P protocol encryption 🔗
  • PR opened for initial BIP151 support 🔗
• BIP70 payment protocol
  • Pay-to-EndPoint (P2EP) has elements similar to BIP70 🔗
• Coinjoin
  • BLS signatures library possibly useful for non-interactive coinjoins 🔗
• Compact block filters
  • Functions for generating BIP158 filters added to Bitcoin Core 🔗
• Dandelion
  • Dandelion DoS-resistant stem routing being researched 🔗
• Low-r grinding
  • Bitcoin Core wallet to begin only creating low-r signatures 🔗
• Minisketch
  • Researching bandwidth-efficient set reconciliation protocol 🔗
• MuSig
  • BLS signatures based on the MuSig construction 🔗
• Payjoin
  • Pay-to-EndPoint (P2EP) proposed 🔗
• Quantum resistance
  • PR opened for initial BIP151 support, NewHope quantum resistance to follow 🔗
• Responsible disclosures
  • Cory Fields disclosed a consensus failure vulnerability Bitcoin ABC (Bitcoin Cash) 🔗
• Static channel backups
  • C-Lightning #1854 partly implements option_data_loss_protect 🔗
• Watchtowers
  • LND PR #1543 adding watchtower version 0 encoding and encryption 🔗

July 2018

• Partially signed bitcoin transactions
  • PSBT discussion 🔗
  • Features included in Bitcoin Core 0.17 🔗
  • New Bitcoin Core RPCs for initial PSBT support 🔗
• Coin selection
  • Coin selection groups for privacy and consolidation 🔗
  • Bitcoin Core unlikely to add coin selection RPC 🔗
• Default minimum transaction relay feerates
  • Discussion about lowering the default minimum relay feerate 🔗
  • Accidentially creating transaction below the default min relay feerate 🔗
• Schnorr signatures
  • Proposed schnorr BIP 🔗
  • Continued bip-schnorr discussion 🔗
• Coinjoin
  • CoinjoinXT presentation 🔗
• Coinswap
  • Talk about using schnorr signatures for blind coinswaps 🔗
• Dandelion
  • Discussion of Dandelion route selection 🔗
• Output linking
  • Bitcoin Core #12257: new -avoidpartialspends configuration option 🔗
• Output script descriptors
  • First use of descriptors in Bitcoin Core 🔗
• SIGHASH_ANYPREVOUT
  • Renaming of SIGHASH_NOINPUT to SIGHASH_NOINPUT_UNSAFE 🔗
• Signer delegation
  • Continued discussion over graftroot delegation safety 🔗

June 2018

• Coin selection
  • Coin selection simulations 🔗
• Compact block filters
  • Discussion of what data should be included in BIP158 filters 🔗
• OP_CODESEPARATOR
  • Bitcoin Core 0.16.1 to cease relaying transactions using OP_CODESEPARATOR 🔗

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