token-withdraw

token-withdraw Tutorial

token-withdraw shows how to move ERC20 tokens from Arbitrum (Layer 2) into Ethereum (Layer 1).

Note that this repo covers initiating a token withdrawal; for a demo on (later) releasing the funds from the Outbox, see outbox-execute

How it works (Under the hood)

To withdraw a token from Arbitrum, a message is send from a Gateway contract which burns the token on L2, and sends a message to L1, which allow the token to be released from escrow once the dispute period is expired. For more info, see Outgoing messages documentation.

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Standard ERC20 Withdrawal

In this demo, we deploy a fresh token and then deposit some to L2. Then, we use these new tokens to trigger a withdrawal back to L1.

We use our Arbitrum SDK library for the token bridge interactions.

See ./exec.js for inline explanation.

Config 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., DEVNET_PRIVKEY)

Run

yarn withdraw-token