Cryptocurrency can be lost in a variety of ways Bad Code Has Lost $500 Million of Cryptocurrency in Under a Year, from hacking to forgotten passwords and failed flash drives.

news.Bitcoin.com reported Bitgrail lose $170 million of nano crypto :

There are rumors that Bitgrail became insolvent following a withdrawal bug that was discovered by some users and then shared in Discord and other chat groups, causing the wallet balance to gradually diminish. One user explained: “There was a bug on Bitgrail where if you placed two orders you got double balance added to your account. You could then withdraw while the orders were up and steal the coins. You had negative balance in the end but you could just make a new account.”

aftermath of the incident, this theory has been bolstered by allegations that :

There was another bug, you could request a withdrawal to your address – from another user-id, from another user-account. That would cause the other users balance to have “missing funds” or “negative balance”. Bitgrail bomber solved this bug by manually entering the “correct” numbers in his database. This is what you get for using a PHP website coded by same skill-level as CfB of IDIOTA.

Interesting Read More : https://news.bitcoin.com/bad-code-has-lost-500-million-of-cryptocurrency-in-under-a-year/

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