Is it possible to withdraw bitcoins to bank account
Certainly it's impossible. What you need to do is to convert it into a fiat money through coinbase for dollar, coin.ph if you are from Philippines. If you can't do both of that, you can convert fiat money directly to a person who trade btc-fiat money pairs vice versa
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Convert fiat money we have, anyway, you can with the help of intermediaries. There are exchange offices that help do it for not a large percentage. And I hope that soon it will be possible to convert in any outlet of the Bank