Announcements

Please join us for our next Socratic Seminar. This Socratic Seminar is sponsored by Ben Delo. Please speak to the hosts if you’re interested in supporting London BitDevs.

General Links

• Bitcoin Optech
• Bitcoin Core PR Review Club
• bitcoin-dev Mailing List
• lightning-dev Mailing List

Delving Bitcoin, Mailing Lists, Meetings and Bitcoin Optech

Delving Bitcoin

• Zawy’s Alternating Timestamp Attack
• Non interactive anti-exfil (airgap compatible)
• Optimistic ZK verification using MATT
• Stats on compact block reconstructions
• Bolt 12 Trusted Contacts
• Onion Messaging DoS Threat Mitigations

Mailing Lists

bitcoindev

• Bitcoin Core’s migration to the CMake buildsystem
• Public disclosure of 2 vulnerabilities affecting Bitcoin Core < v22.0

Meetings

• Bitcoin PR Review Club
  • #30352 Add PayToAnchor(P2A), OP 1 <0x4e73> as standard output script for spending

Optech

• Newsletter #314, audio recap
• Newsletter #315, audio recap
• Newsletter #316, audio recap
• Newsletter #317, audio recap

CVEs and Research

Research

• New multiplication algorithm for Circle STARK
• Engineering a backdoored bitcoin wallet

InfoSec

• Dark Skippy (and some related discussion)

Pull Requests and repo updates

Bitcoin Core

• Don’t empty dbcache on prune flushes: >30% faster IBD
• cluster mempool: cluster linearization algorithm
• Testnet4 including PoW difficulty adjustment fix
• policy: Add PayToAnchor(P2A), OP_1 <0x4e73> as a standard output script for spending
• blockstorage: XOR blocksdir *.dat files
• policy: enable full-rbf by default
• assumeutxo: Drop block height from metadata
• validation: assumeutxo params mainnet
• Have miner account for timewarp mitigation, activate on regtest, lower nPowTargetTimespan to 144 and add test
• Move maximum timewarp attack threshold back to 600s from 7200s

New Releases

• ARK v0.2
• Floresta Update: Simplifying Bitcoin Node Integration for Wallets
• BDK 1.0.0-beta.1

Miscellaneous

• “OP_CAT alone and the Great Script Restoration enable exactly the same constructions on bitcoin.”
• “Prevent the CATastrophe”