Scince blockchain is known as the largest and the safest BITCOIN wallet ,but still it can be hacked also. As I know 'cause some of my knowns and me also were been hacked a couple of days before .I feel very stange,but the fact I consider is that no ones hard earn money secured in such wallet.
BEWARE OF SITE WHICH COMES WITH RUSSIAN SUBTITLE NAMED : "BLOCKCHAIN POOL".
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From @maddymaster