# Smart Contracts

Everything Veilon does is enforced by smart contracts public, verifiable, and secure.

#### <mark style="color:yellow;">Features:</mark>

* Shielded Pools for each asset type
* zkVerifier Contracts for proof validation
* Bridge vaults for multi-chain flow
* Governance hooks for upgrades or parameter tuning

#### <mark style="color:yellow;">Security:</mark>

* Built-in fail safes
* Audit ready circuit logic
* Open source transparency with formal verification roadmap

```javascript
mapping(bytes32 => bool) public nullifiers;

function validateAndInsertNullifier(bytes32 nullifierHash) internal {
  require(!nullifiers[nullifierHash], "Nullifier already used");
  nullifiers[nullifierHash] = true;
}
```


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