Outbox Execute

Check out this tutorial on GitHub: outbox_execute

The outbox contract is responsible for receiving and executing all “outgoing” messages; i.e., messages passed from a chain to its parent chain (for example, from Arbitrum to Ethereum).

The (expected) most-common use-case is withdrawals (of, i.e., Ether or tokens), but the outbox handles any arbitrary contract call, as this tutorial illustrates.

See exec.py for inline comments / explanation.

Click here for more information on child-to-parent message passing.

Set environment variables

Set the values shown in .env-sample as environmental variables. To copy it into a .env file:

cp .env-sample .env

You’ll still need to edit some variables, i.e., PRIVATE_KEY, CHAIN_RPC and PARENT_CHAIN_RPC.

Note that you can also set the environment variables in an .env file in the root of the monorepo, which will be available in all tutorials.

Run

Install dependencies:

pip install -r requirements.txt

Run the script:

python3 exec.py 0xmytxnhash

• 0xmytxnhash is expected to be the transaction hash of a transaction in the child chain that triggered a child-to-parent message.