The Outbox contract is responsible for receiving and executing all "outgoing" messages; i.e., messages passed 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 demo illustrates.

See ./exec.js for inline comments / explanation.

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., DEVNET_PRIVKEY)

 yarn hardhat outbox-exec --txhash 0xmytxnhash

• 0xmytxnhash is expected to be the transaction hash of an L2 transaction that triggered an L2 to L1 message.

See our developer documentation on messaging between layers.