OP_CAT, short for "Operation Concatenate," is a proposed opcode in Bitcoin's scripting language that aims to enhance the network's functionality by allowing users to combine two data values on the stack during transaction execution. Originally included in Bitcoin's early implementation, OP_CAT was disabled by Satoshi Nakamoto due to security concerns, particularly the potential for denial-of-service (DoS) attacks. However, recent discussions within the Bitcoin developer community have revived...