A smart contract is program logic deployed to a network and executed under that network's rules.
Code is only one layer
User interfaces, administrators, oracles, bridges, libraries and governance processes can influence outcomes around the deployed program.
Composability joins risk surfaces
One application may call several contracts and depend on external state. A failure in a dependency can propagate even when the calling contract behaves as designed.
Review evidence has boundaries
Testing, audits, formal methods and monitored operation can improve confidence. Each covers a defined scope and time, so changes and new conditions deserve renewed review.
