How A Bitcoin ATM Works. Coinbase lets you sell Bitcoins for cash which you can then withdraw into your bank account. Pin On Bitcoin Atm The recipient then has several options on how to convert the Bitcoin they received to cash if thats what they want. How to get cash from bitcoin atm . The fastest way to do this is by using a Coinsource Bitcoin ATM to convert the Bitcoin to cash and withdraw it. You need to log in to your account on the Bitcoin ATM select the withdrawal cash option then enter the amount of cash and send Bitcoin to the wallet address QR code indicated. Buy Bitcoins with cash through the mail. Head to the Bitcoin ATM. Wallet update of Robocoin ATMs required customers to wait for 6 confirmations before they can get cash. 4 Options for buying Bitcoin with Cash. Depending on the settings you will either get cash out of the machine immediately may be set for small amounts or you will be given the redeem code and need to wait for bitcoin transaction con