# Execute

The execute function is responsible for applying changes from a successfully approved and queued proposal to the designated target contracts within the Onyx protocol. Once a proposal has passed the governance process and completed the Timelock delay period, it can be executed, implementing the proposed modifications.

#### Function Implementation in CHNGovernance

The `execute()` function ensures that only successful and properly queued proposals can be executed, enforcing governance integrity and protocol security.

#### Function Signature

<pre><code><strong>function execute(uint proposalId) public payable returns (uint)
</strong></code></pre>

#### Parameters

* `proposalId`: The unique identifier of the proposal to be executed. This proposal must have successfully passed governance voting, been queued, and completed the Timelock delay period.
* `RETURN`: The function does not return a value. If execution fails due to an invalid or non-queued proposal, it will revert with an error.

#### Example Solidity Implementation

To execute a proposal using Solidity, the `execute()`function can be called from an instance of the `CHNGovernance` contract:

```
CHNGovernance gov = CHNGovernance(0x123...); // Contract address of CHNGovernance
gov.execute(proposalId).value(999).gas(999)();
```

#### Web3.js Implementation (v1.2.6)

For interacting with the `CHNGovernance` contract using Web3.js, the following example demonstrates how to execute a proposal:

```javascript
const tx = await gov.methods.execute(proposalId).send({ from: sender, value: 1 });
```

#### Technical Considerations

* The execute() function is state-modifying and will incur gas costs.
* A proposal must have been successfully queued and completed the Timelock delay period before it can be executed.
* The function is payable, allowing the Timelock to invoke functions that require ETH transfers.
* If an attempt is made to execute an invalid, unqueued, or pending proposal, the transaction will revert with an error.
* The Timelock contract ensures security and decentralization, preventing immediate execution after proposal approval.


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