According to @BitMEXResearch, Satoshi’s OP_RETURN was a different opcode that terminated script execution and returned pass or fail based on the top stack element, not the data-carrier used today. source: BitMEX Research on X, Sep 25, 2025. @BitMEXResearch adds that the original OP_RETURN has nothing to do with today’s OP_RETURN used to place data in a prunable transaction output on Bitcoin (BTC), a distinction relevant to policy debates around current data-carrier usage. source: BitMEX Research on X, Sep 25, 2025.