Bitcoin Optech #274: Replacement Cycling Vulnerability Against HTLCs

This issue:

Describes the replacement cycling attack against HTLCs used in LN  and other systems, examines the mitigations deployed, and summarizes proposals for additional mitigations.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.Summarizes popular Q&A from Stack Exchange.Bitcoin Core 26.0rc1 is a release candidate for the next major version of the predominant full node implementation…”Bitcoin Optech will host an audio recap discussion of this newsletter with special guests Fabian Jahr and Ethan Heilman on Twitter Spaces Thursday at 15:00 UTC. Join us to discuss or ask questions!”

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