Deep Web3 / Knowledge library · Foundations · 2 min read
Code executes specific rules
A smart contract is a program deployed to a blockchain execution environment. Transactions call its functions, read information, and can change stored state. The contract follows implemented logic, which may differ from a website’s description or a user’s intention.
The word “contract” does not automatically grant legal rights, correct market prices, or error-free software. Code can enforce a rule about onchain balances while depending on an outside actor for something else. The useful question is which exact outcome the program can verify for itself.
A hypothetical escrow
An escrow contract holds tokens until a deadline. It pays a seller only after an authorized buyer confirms delivery; otherwise, a timeout rule returns tokens. The blockchain can check signatures and time conditions, but cannot directly know whether a physical package arrived undamaged.
If a dispute requires an arbitrator, the arbitrator is part of the system’s authority model. If an oracle supplies a delivery signal, that input is another dependency. Calling the escrow “automatic” does not make those judgment calls disappear. Describe them alongside the code rather than hiding them beneath a trustless label.
| Claim | Concrete inspection |
|---|---|
| Funds are locked | Withdrawal and emergency functions |
| Rules cannot change | Proxy, upgrade authority, and timelock |
| Data is reliable | Oracle sources and failure behavior |
Source verification and upgrades
Verified source code helps readers compare published source with deployed bytecode using the verification system’s process. It does not prove that the design is safe or that every permission is appropriate. An audit likewise has a scope, date, version, and assumptions that must match the deployed arrangement.
An upgradeable proxy separates a stable interaction address from changeable implementation logic. This can enable repairs and new features, but creates authority capable of altering behavior. Inspect who can upgrade, whether changes are delayed, and how users learn about pending actions.
A protocol may also depend on libraries, other contracts, token behavior, and administrative roles. A small contract with few lines can have a large effective dependency surface. Map the calls and permissions relevant to the action you intend, especially when assets can move elsewhere.
An interaction checklist
- Confirm the network and contract address through independent project channels.
- Locate the functions that move assets and the conditions they enforce.
- Identify upgrade, pause, rescue, and privileged withdrawal roles.
- Read audit scope and version instead of relying on an audit badge.
- Test the complete deposit-to-withdrawal lifecycle with a limited amount.
Write a one-paragraph failure scenario before depositing: what happens if the website vanishes, an oracle stops, or an administrator is compromised? An answer requiring undocumented promises is a sign that more investigation is necessary.
Frequently asked questions
Can a contract act entirely on its own?
Execution generally needs an initiating transaction or another call. Automation systems can trigger actions, but introduce their own operational dependencies.
Is verified code the same as audited code?
No. Verification concerns correspondence with deployed code. An audit reviews particular behavior under a defined scope. Neither is a blanket safety guarantee.
