Announcements

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Mailing Lists, Meetings and Bitcoin Optech

Mailing Lists

bitcoin-dev

• (BIP Proposal) Removal of BIP 125 RBF signalling in wallet transactions
• Aligning privacy incentives in P2MR
• (BIP Proposal) Informational BIP on Low-R Signature Grinding
• (BIP Draft) Testnet 5
• Prohibit Merkle Internal Node Preimages That Encode Minimal 64-Byte Transactions
• A look at SHRINCS
• (BIP) P2WOTS: 64 Slot Winternitz UTXO’s (witness version three)
• One Time Signatures as an Advantage?
• Weak Quantum Bounty Ceremony
• BIP 3 and issues on BIPs
• Testnet 4 difficulty/hashrate
• Knowledge Gathering: SPV Proof Applications In the Wild and Proposed
• (BIP127) announcements: removal of Proof File Format and update status to Complete
• PQC: Lattice-based signatures
• Mapping the design space of sibling-aware covenants
• (BIP Proposal) Hybrid SPHINCS+ / secp256k1 Key Derivation for Quantum-Resistant Paper Wallets
• Notice: Can BIP52 be moved to Closed?
• A “Quantum-Agile” Bitcoin address proposal

Delving Bitcoin

• Encoding art into the satoshi value field, and the unfilterable floor
• Public key recovery for EC leaves in P2MR (BIP-360)
• Default signet reorg history — was the fork at height 287766 (depth 19) deliberate?
• P2WOTS: Live Signet & Interactive Wallet Demo
• PQC: Google’s result on improving Shor’s algorithm reconstructed
• A Bitcoin-native LLM: dataset, architecture and open questions
• Regular signet reorgs
• CTV-only Vault Concept v0.1.0 release
• P2WOTS: Post Quantum UTXO Winternitz Signatures
• New Post Quantum Bitcoin Proposal using WInternitz + Lamport auth chains
• Quantum Attack Game Theory
• PQC: Lattice-based signatures
• Bird of Prey 2: non-malleable Schnorr + PQ signatures
• Add optional UltrafastSecp256k1 backend (opt-in, default unchanged)
• UltrafastSecp256k1 v4.0 — Verification, Performance, and the Cost of Engineering Truth
• Vulnerability Disclosure: Assertion DoS in Core Lightning
• Replay protection conditions/solutions
• QCAP: A Bitcoin-Native Quantum Canary Alert
• TCP hole punching for Bitcoin nodes behind home NATs?

Bitcoin Network Operations Collective

• Brainstorming: What data to collect and monitor during the BIP-110 & BIP-300 forks in August 2026?
• High CPU usage on Knots node causing connections to drop
• Electrum Server Monitoring
• Request: How many mempool transactions are evicted by time?
• Temporary increase in number of Tor addresses
• Addrman age distribution
• Addresses with multiple ports
• How similar are addrman of different nodes
• Back-to-back fork at height 949203 and 949204
• Request: Bitnodes historic datasets (or similar)
• Logs of “Mempool in non-optimal ordering after block/additions(s)”

Meetings

• Bitcoin Core general developer meetings
  • May 14
  • May 21
  • May 28
  • June 4
  • June 11
• Bitcoin Core Dev bi-annual meeting
  • Bitcoin Core Dev Tech Transcripts (May 2026)
• Lightning Specification meeting
  • Lightning Specification Meeting 2026/06/29

Optech

• Bitcoin Optech Newsletter #409
• Bitcoin Optech Newsletter #408 - Recap Podcast
• Bitcoin Optech Newsletter #407 - Recap Podcast
• Bitcoin Optech Newsletter #406 - Recap Podcast
• Bitcoin Optech Newsletter #405 - Recap Podcast

Network Data

• Bitnod.es — Reachable Bitcoin Nodes

CVEs and Research

Research

• ChainQuery: Quantum Exposure Tracker

InfoSec

• 1-Click GitHub Token Stealing via a VSCode Bug

Pull Requests and repo updates

Bitcoin Core

• btcsignals: delete broken scoped_connection move assignment
• node: allocate index caches proportional to usage patterns
• BIP 434 Support: Peer feature negotiation
• validation: Don’t add pruned blocks to m_blocks_unlinked on startup
• p2p: Prevent integer overflow in LocalServiceInfo::nScore
• crypto: cleanse HMAC stack buffers after use and ChainCode
• p2p: Release m_peer_mutex early in InitiateTxBroadcastToAll
• rpc: make getprivatebroadcastinfo and abortprivatebroadcast fail if privatebroadcast is not enabled
• blockstorage: Remove cs_LastBlockFile recursive mutex
• net: use the proxy if overriden when doing v2->v1 reconnections
• coinselection: Optimize BnB exploration
• Make deployment configuration available outside of regtest in unit tests
• BIP 323: reserve version bits 5-28 as extra nonce space
• Bugfix: GUI/Intro: Handle errors from SelectParams the same as if during InitConfig
• musig: Include pubnonce in session id
• wallet: allow anti-fee-sniping in sendall RPC while not relying on RBF default
• kernel: assert invalid buffer preconditions in btck_*_create functions
• wallet: mark bip125-replaceable RPC key and walletrbf startup option as deprecated
• cli: Replace libevent usage with simple http client
• Run feature_bind_port_(discover|externalip).py in CI
• wallet, test: optinrbf deprecation followups
• wallet: Construct ScriptPubKeyMans with all data rather than loaded progressively
• wallet: fix ancient wallets migration
• mining: add submitBlock to IPC Mining interface
• validation: fix misleading VerifyDB summary log
• bitcoin-cli: note -rpcclienttimeout is not implemented for IPC connections
• wallet: Fix for duplicate external signers case
• kernel: improve BITCOINKERNEL_WARN_UNUSED_RESULT usage
• mempool: remove all subsequent tx in pkg on failure
• musig: Reject empty pubkey list in GetMuSig2KeyAggCache
• coinselection: Tiebreak SRD eviction by weight
• wallet: use outpoint when estimating input size
• kernel: Refactor process_block_header to return btck_BlockValidationState
• psbt, test: remove address type restrictions in test
• ArgsManager: support command-specific options
• psbt: preserve proprietary fields when combining PSBTs
• mining: always pad scriptSig at low heights, drop include_dummy_extranonce
• refactor, key: move CreateMuSig2{Nonce,PartialSig} functions to musig.{h,cpp} module
• wallet: addhdkey RPC to add just keys to wallets via new unused(KEY) descriptor
• rpc: combinerawtransaction now rejects unmergeable transactions
• wallet: remove outdated arguments from chain scanning methods
• guix: Split manifest into build and codesign manifests
• ci: switch to warp runners
• doc: Remove good_first_issue.yml, Reword “Getting started” section

BDK

• feat(core): add skiplist to CheckPoint for faster traversal

rust-bitcoin

• crypto: Introduce new errors to remove secp256k1::Error
• primitives: Simplify and optimize witness decoder
• key_expression: bip32 seed length validation follow-up
• Change Command String to 12 byte Array
• witness: Allocate in reserve_batch if capacity < MIN_VECTOR_ALLOCATE
• bitcoin: validate master key seed length
• Explicitly don’t support ficticious architectures
• Introduce signing functions on sighash types
• p2p: Replace decoder definitions with decoder_newtype macro
• p2p: error on CommandString inner nul bytes
• crypto: Improve sighash errors
• consensus_encoding: hex encoding/decoding support
• primitives: Avoid allocating claimed size when decoding witness length
• refactor(bip32): split relative and absolute bip32 derivation paths
• primitives: add minimum allocation size
• bip158: reject malformed filter counts
• taproot-primitives: Remove crypto dependency
• crypto: Remove XOnlyPublicKey::as_inner and make to_inner private for public keys
• p2p: calculate v1 checksum on original payload
• hashes: process multiple sha256 blocks per call

libsecp

• Add exhaustive test for ECDH module
• tests: compare full MuSig aggregate nonce

secp256k1-zkp

• ecdsa_adaptor: make DLEQ nonce generation pluggable

Core Lightning

• lightningd: add watchman module
• xpay tweaks and fixes
• gossipd: be more robust against channel_update spamming.
• Fix payer proofs to match latest spec
• Improving currencyrate plugin
• xpay: add sendamount
• askrene: askrene-remove-channel-update
• lightningd: include offer_id in invoice_creation notification
• fix: release txprepare reservations on send failure
• splice: Make feerate opening + feerate_offset
• Add bwatch as a standalone plugin
• setconfig: fix crash on dynamic multi-value plugin options
• add xpay user layers
• config: change message-padding to false by default.
• graceful shutdown
• Deprecate pay, keysend, renepay and getroute
• Payer proofs
• Askrene: Reservation leak under load
• contrib: add daywalker90’s signing key
• security: remove rustcorp.com contact
• contrib: add Lagrang3’s signing key

eclair

• Send splice_locked if necessary while reconnecting
• Fix Bolt12 path fee hiding
• Add support for zero-fee commitment format
• Change RBF feerate bump rule to match BIP125
• Update features early on reconnection
• Fix edge case in availableBalanceForSend/Receive

LDK

• Splice fixes for chanmon_consistency fuzz target
• Reject quantity of 0 for offers with bounded quantity
• Return P2WSH script pubkey for keyed anchor prevouts
• Account for UTXO base weight in anchor reserve checks
• Release LSPS2 intercepted HTLCs on open failure
• splice_locked + channel_reestablish bug fixes
• Fix missing PaymentSent::fee_paid_msat
• Prefer outbound SCID alias over real SCID when routing
• Enforce that node_ids are sorted in channel_announcements
• Persist negotiated splice candidates on reload
• Add async variant of MigratableKVStore
• Don’t validate a splice if updates are pending
• Restore splice coverage in chanmon_consistency fuzz target
• Encrypt payment_metadata when we build the payment secret
• Avoid splice checks when responding to stfu
• Gate interactive commitment_signed on user approval during reestablish
• Validate next_splice_out_maximum_sat and reserved fees on both commitments
• Locked splice bug fixes during channel reestablishment
• Add a payment_metadata map in blinded * path contexts
• Disallow holders from selecting 0-reserve in legacy channels
• Support manually selecting inputs consuming their entire value
• Don’t persist inbound committed onions in prod
• Reset LSPS5 persistence_in_flight counter on persist errors
• Drop QuiescentError::with_negotiation_failure_reason
• Enforce min_funding_satoshis after splices
• Attempt to unblock blocked monitor updates on startup
• Support async signing of splice shared input
• Commit to payment_metadata in inbound payment HMAC
• Include NegotiationFailureReason in InteractiveTxMsgError
• Produce FundingInfo::Contribution variants in ChannelMonitor
• Avoid repeated refreshes for persisted async invoices
• Stop using an introduction node in blinded message paths
• Speed up TLV serialization length accounting
• Don’t trim HTLCs when calculating the commit tx fee including the fee spike multiple

lnd

• payments: Add FetchInFlightPayments Benchmarks
• Drop tor v2 onion production, keep wire codec faithful
• contractcourt: insta-dispatch CLOSED_CHANNEL on first conf of coop close
• neutrino: add fast initial sync via header import
• funding: require explicit taproot channel negotiation
• chancloser: don’t set ChanStatusCoopBroadcasted before close tx exists
• rpcserver: filter backup subscription events
• routerrpc: pass outgoing channels to probe requests
• routerrpc: isolate LSP route fee probes
• lnwallet/rpcwallet: keep zero-value prev outputs in remote-sign PSBT
• Remove deprecated Send* / TrackPayment RPCs and outgoing_chan_id field
• routerrpc: add outgoing_chan_ids to EstimateRouteFee
• multi: bump pgx/v4 -> pgx/v5, jackc/pgconn -> jackc/pgx/v5/pgconn
• chainreg: use getnetworkinfo to count outbound peers (bitcoind backend)
• chanstate: migrate consumers to Store interface (PR 2 of channel-state decomposition)
• autopilot+graph/db: drop unused address loading from cached node iteration
• onionmessage: graph-based pathfinding for onion messages
• chanstate: introduce Store interface (PR 1 of channel-state decomposition)
• funding: enforce BOLT-02 push_msat bound on fundee

BIPs

• BIP 77: Specify v1-fallback response mechanism
• BIP-0322: use MAJOR version for address optionality
• BIP-0322: remove address optionality for PoF
• BIP449: OP_TWEAKADD
• BIP450: Formosa—Seed Encoding per Themed Mnemonic Stories
• BIP 54: clarify 64-byte transactions item description and rationale
• BIP323: 24 nVersion bits for general purpose use

BLIPs

• blip-0042: Bolt 12 Contacts

BOLTs

• bolt04: Fix requirements of failure message for final node
• BOLT 2: Don’t channel_ready if the miner created the funding tx using coinbase transacion
• BOLT 4: remove incorrect assertion about intermediary nodes handling onion messages.

Miscellaneous

• Introducing Cube — Bitcoin-Native Layer 2
• Please Do Not Vibe Fuck Up This Software
• A Plebslop LLM Small Enough to Fit in a Bitcoin Transaction
• Cornell Bitcoin Club Research Repository
• Surveillance Is Not Safety — Statement on the UK’s Latest Threat to Privacy
• Anthropic Statement on US Government Directive to Suspend Access to Fable 5, Mythos 5
• Matching Hashes: Reproducing the Guix-built Bitcoin Core release binary with Nix
• Quantum-Safe Bitcoin Transactions — GitHub (avihu28)
• Introducing Majorana 2 — Microsoft’s Topological Qubit Processor
• Disclosure: PrivateBroadcast IP Address Leak (Bitcoin Core)
• (ZCash) The Orchard Counterfeiting Vulnerability — and Next Steps (ECC)
• The first public reverse-engineering of Canaan’s A3197S Bitcoin mining ASIC