# Example Usage and Deployment

## Example Usage and Deployment

1. **Deployment**: A script (e.g., `DeployGateway.sol`) deploys `Gateway.sol`, assigns `DEFAULT_ADMIN_ROLE` to a Gnosis Safe, plus `APPENDER_ROLE` to the aggregator account.
2. **Genesis Batch**: The aggregator calls `submitBatch` with `bytes32(0)` for `prevBatchHash`. This finalizes initialization.
3. **Normal Batches**: Each L2 block is compressed into a `BatchHeader`. The aggregator calls `submitBatch(header)` referencing the current `_lastCommitHash`.
4. **Fork Creation**: If needed, a user with `FORKER_ROLE` calls `forkChain(header, targetForkId)`. The system abandons irrelevant forks and increments `currentForkId`.
5. **Pause and Unpause**: If an emergency arises, an admin with `PAUSER_ROLE` calls `pause()`. No further commits/forks can happen. Once resolved, `unpause()` is invoked by the `UNPAUSER_ROLE`.


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