# What is a smart contract? Code that runs exactly as written

> Canonical: https://blazephoenix.xyz/learn/what-is-a-smart-contract
> License: CC BY 4.0 (attribution + link) · © 2026 BlazePhoenix
> Updated: 2026-08-05



A smart contract is a program deployed to a blockchain. Once it is on chain, its code is public, it runs exactly as written, and it executes the same way for everyone who calls it. There is no back office deciding to treat your transaction differently. A swap, a stake, a token transfer, all of it is a call to a contract that either succeeds by its own rules or reverts.

## Powerful, but not magic

Runs-as-written cuts both ways: a bug is also executed faithfully, which is why audits and reproducible behaviour matter. The honest test of a contract is whether you can predict and reproduce what it does before you use it. BlazePhoenix leans into that by computing quotes with the same contract that settles them, so what you preview is what executes.

**Verify it yourself:** Read the verified source of any contract on a block explorer, then call one of its view functions and compare the result to what an app claims

Related: https://blazephoenix.xyz/learn/stateless-contracts · https://blazephoenix.xyz/learn/what-is-a-transaction · https://blazephoenix.xyz/learn/on-chain-quoting