Commonly used opcodes

All opcodes are declared in the script.h file in the Bitcoin reference client source code.

This can be accessed from the link at https://github.com/bitcoin/bitcoin/blob/master/src/script/script.h under the following comment: /** Script opcodes */

A description of the most commonly used opcodes is listed here. This table is taken from the Bitcoin developer's guide:

Opcode

Description

OP_CHECKSIG

This takes a public key and signature and validates the signature of the hash of the transaction. If it matches, then TRUE is pushed onto the stack; otherwise, FALSE is pushed.

OP_EQUAL

This returns 1 if the inputs are exactly equal; otherwise, 0 is returned.

OP_DUP

This duplicates the top item in the stack. ...

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