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Opcode number: 78
Byte representation: 0x4e
Short description: Read the next 4 bytes as N. Push the next N bytes as an array onto the stack.

The OP_PUSHDATA4 opcode will read the 4 bytes that follow it and interpret them as an integer. It will then push the next number of bytes this integer specifies onto the stack. Because it reads 4 bytes and inteprets them as a number, this opcode can push any number of bytes from 0 to 4,294,967,295. Since the largest data push allowed by consensus rules is 520 bytes for which it is more efficient (and required by standardness rules) to use OP_PUSHDATA2, this opcode is never used in practice (see minimal push operations).

OP_PUSHDATA4 is part of a group of 3 opcodes that push a custom, user-specified number of bytes onto the stack (its sibling opcodes are OP_PUSHDATA1 and OP_PUSHDATA2).