What is Bitcoin OP_CAT?

OP_CAT, which stands for OPcode Concatenate, is a proposed Bitcoin opcode that would enable more efficient and flexible smart contract functionality on the Bitcoin blockchain. Opcodes are low-level instructions that define the operations that can be performed within a Bitcoin script. Bitcoin scripts are small programs that control the spending conditions of Bitcoin transactions. They determine how and when Bitcoin can be moved from one address to another.

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