Opcodes · stack · enabled

OP_DUP (0x76)

Duplicates the top item. Most famous as the first step of a P2PKH lock.

Verified
Stack in → out
x → x x
Since
Original Bitcoin script
Cost
Base instruction cost 100 plus bytes pushed (2025 VM limits).
Bitcoin status
Same in Bitcoin (BTC)

Example

OP_DUP OP_HASH160 <pkh> OP_EQUALVERIFY OP_CHECKSIG

Step through it opcode by opcode in Bitauth IDE, the in-browser BCH VM debugger.

Sources

  1. Libauth BCH_2023_05 opcodes (bch-2023-opcodes.ts)