The withdrawal flow
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Before withdrawal can occur, Starkware requires transferring the funds from your tanX 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 tanX transfers the funds to the user in a trust-less way.
