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While securities are in place, that does not mean cryptocurrencies are un-hackable. Several high-dollar hacks have cost cryptocurrency start-ups heavily. Hackers hit Coincheck to the tune of $534 million and BitGrail for $195 million, making them two of the biggest cryptocurrency hacks of 2018. Leading crypto wallet MetaMask rolls out real-time security alerts after ‘really encouraging’ trial Choose crypto or fiat currency to buy LINK with.