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OP_DATA_X

The OP_DATA_X op codes push bytes following the opcode from the script to the top of the stack. The number of bytes pushed by the op code is the value of the op code interpreted as a two's complement integer. For example, OP_DATA_4 (op code 0x04) pushes the next 4 bytes in the script as a single value on the stack.

Script Post-Execution Stack
0x04 0xFFFF001D
~~0x04~~ ~~0xFFFF001D~~ 0xFFFF001D