Before withdrawal can occur, Starkware requires transferring the funds from your Brine User vault to another off-chain vault that is identified with the same user’s Ethereum address instead of their Stark key.
The `add_transaction` API with the `TransferRequest` transaction type registers the Ethereum address.
You can enable registration in your off-chain application’s logic in one of the following ways:
* Your user enters a request to transfer the funds from the vault with their Stark key to a vault that they identify with their Ethereum address.
* When your application prompts the user for the information required to send a `WithdrawalRequest` transaction to the Starkware gateway, it also prompts them to enter the parameters necessary to execute a `TransferRequest` transaction, and your application executes the transfer as a seamless step in the withdrawal process.
The basic withdrawal flow takes place as detailed here, as Brine transfers the funds to the user in a trust-less way.
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