The OPCAT token is the first CAT20 token deployed on Fractal Bitcoin. OPCAT is an innovative Bitcoin token protocol that combines the advanced features of the CAT protocol with the scalability solutions provided by Fractal Bitcoin. By using the OP_CAT opcode, OPCAT achieves complete on-chain token issuance and management, while also supporting complex smart contract functionality and cross-chain interoperability. This article will delve into the technical principles, token economics, and potential use cases of OPCAT, demonstrating its enormous potential in driving smart contract and token innovation within the Bitcoin ecosystem.