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Retrieved on: 2018-03-18 23:00:00
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<div>Blockchain is a decentralized technology that can make transactions safe and secure, but <b>crypto</b>-<b>currency</b> exchanges that trade bitcoins and other <b>virtual</b> <b>currencies</b> that are based on this technology have been hacked because they are not working on secure networks. (AP Photo/Koji Sasahara).</div>
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