In this conversation with Udi Wertheimer, the discussion revolves around the significant buzz and potential impact of OPCAT, a previously disabled Bitcoin opcode from its initial release in 2009, which is being revived. The conversation explores how OPCAT could revolutionize Bitcoin by enabling various new functionalities, such as permissionless bridging to other chains, improved self-custody measures, enhanced security, and better scalability for protocols like Lightning Network and ZK rollups.