👉 Bitcoin Optech #274

  • Describes the replacement cycling attack against HTLCs used in LN and other systems, examines the mitigations deployed, and summarizes proposals for additional mitigations.
    • Deployed mitigations in LN nodes for replacement cycling
      • Frequent rebroadcasting
      • Longer CLTV expiry deltas
      • Mempool scanning
      • Discussion of mitigation effectiveness
    • Proposed additional mitigations for replacement cycling
      • Incrementing fees towards scorched earth
      • Automatic retrying of past transactions
      • Presigned fee bumps
      • OP_EXPIRE
  • Notes a bug affecting a Bitcoin Core RPC.
  • Describes research into covenants with minimal changes to Bitcoin Script.
  • Announces a proposed BIP for an OP_CAT opcode.
  • Popular questions and answers from the Bitcoin StackExchange
  • Bitcoin Core 25.1
  • Bitcoin Core 24.2
  • Bitcoin Core 26.0rc1
  • Notable code and documentation changes
  • Bitcoin Optech Newsletter #274 Recap Podcast