Overview

Operation codes originate from the Bitcoin Script language which pushes data or performs functions within a pubkey script or signature script.

Details

Pubkey Script

A pubkey script is included in transaction outputs and sets the conditions that must be fulfilled for those satoshis to be spent. Data for fulfilling the conditions can be provided in a signature script. Pubkey Scripts are called a scriptPubKey in code.

Signature Script

A signature script is generated by a spender. Signature scripts are almost always used as variables to satisfy a pubkey script. Signature Scripts are called scriptSig in code.

Resources

​Op codes list​

References

[1] https://bitcoin.org/en/glossary/op-code​