Redeem Pending Retryable

Check out this tutorial on GitHub: redeem_pending_retryable

Retryable tickets are the Arbitrum protocol’s canonical method for passing generalized messages from the parent chain to a child chain (for example, from Ethereum to Arbitrum). A retryable ticket is a message for a chain, encoded and delivered by its parent chain; if gas is provided, it will be executed immediately. If no gas is provided or the execution reverts, it will be placed in the chain’s retry buffer, where any user can re-execute for some fixed period (roughly one week).

You can use exec_create_failed_retryable script to create a failed retryable ticket and then use exec_redeem which shows you how to redeem (re-execute) a ticket that is sitting in the chain’s retry buffer.

See exec_redeem.py for inline explanation.

Click here for more info on retryable tickets.

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 and build the contracts:

chmod +x build.sh && ./build.sh

To create a failed retryable ticket:

python3 scripts/exec_create_failed_retryable.py

To redeem a pending retryable ticket:

python3 scripts/exec_redeem.py --txhash 0xmytxnhash

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