Bitcoin Optech #274: Replacement Cycling Vulnerability Against HTLCs

This issue describes the replacement cycling attack against HTLCs used in LN and other systems and examines its mitigations. Also described are a notable bug affecting a Bitcoin Core RPC, research into covenants with minimal changes to Bitcoin Script, and a proposed BIP for an OP_CAT opcode.

https://www.nobsbitcoin.com/bitcoin-optech-274/