As regards Coinbase, it sends the requested amount of bitcoins to the specified wallet instantly, but funds don’t arrive once they are sent. You will have to wait few hours until your transaction will be confirmed by a Bitcoin node and added to the Bitcoin blockchain. This condition is valid not only for Coinbase withdrawals, but also for any other transfers. Any BTC transaction should be verified and incorporated to the blockchain before recipient gets funds to his wallet. For future, keep in mind that the best practice is to send a little amount of money through an unknown channel for the first time. If the first transfer is successful, you can go with bigger transactions.
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