(Bloomberg) -- Investors’ shaky confidence in virtual currencies took another hit after crypto exchange Bithumb, ranked seventh in the world by traded value on Coinmarketcap.com, suffered a hack that saw about 35 billion won ($32 million) worth of coins stolen.
The South Korean exchange became the nation’s second venue in as many weeks to report a theft, triggering renewed fears about the safety of markets that trade and hold crypto assets.
Boosters still present a bullish picture about the future of digital assets. But the more than $1 billion in thefts -- most of which are unsolved -- is becoming a growing concern for would-be participants.
Here’s a look at some of the biggest thefts since 2012.
- Cryptocurrencies lost about $42 billion in market value in the days after South Korean venue Coinrail said some of its digital currency appeared to have been stolen by hackers, though it didn’t say how much. While Coinrail is relatively small, analysts said the news triggered knee-jerk selling.
- Japanese exchange Coincheck Inc. said it suffered a heist worth $500 million. In the wake of the hack, clients withdrew at least $540 million, and months later the company was sold to brokerage Monex Inc. for $34 million. Turnover on the exchange in April was about 95 percent lower than in December.
- NiceHash, a crypto-mining marketplace based in Slovenia, said on its Facebook page that its payment system was compromised and as much as $63 million worth of Bitcoin was stolen. The firm added extra security measures and sought the community’s help to analyze the breach.
- Youbit said it would file for bankruptcy hours after losing 17 percent of its assets in a cyberattack. The South Korean exchange had suffered what it called an “accident” in April and its owner encouraged clients to keep their tokens in a safer form. South Korean investigators are looking into North Korea’s possible involvement in the hack.
- A group calling itself the White Hat Group exploited a bug in the Parity Wallet software and attempted to launder stolen Ether, valued at about $30 million according to Security Week, through exchanges.
- Just minutes after CoinDash’s launch of an initial coin offering, hackers made off with as much as $6.6 million worth of Ether. The Israel-based firm terminated its token sale.
- A Bithumb contract worker’s personal computer that stored customers’ data files was hacked, resulting in the leak of personal and trading information of more than 30,000 users. The South Korean crypto-exchange was fined 58.5 million won ($55,000) by the local regulator for the breach.
- Decentralized Autonomous Organization, a leaderless venture-capital fund and what was then the highest-profile project using Ethereum, was hacked. About $50 million of members’ contributions to the fund were siphoned off.
- Hong Kong-based Gatecoin had about $2 million in Bitcoin and Ether stolen following a cyberattack.
- Two former U.S. federal agents who helped probe the illegal Silk Road Internet drug emporium were charged with wrongfully pocketing hundreds of thousands of dollars in Bitcoin.
- Mt. Gox, once the world’s biggest Bitcoin exchange, reported that tokens valued at about $480 million had gone missing. The firm filed for bankruptcy in Japan and the U.S., and said the disappearance was probably the result of a “massive theft.”
- BitFloor, based in New York, lost about $250,000 in Bitcoin after it was hacked. Months later in April 2013, the exchange announced it would shut and refund customer deposits, Bitcoin Magazine reported.
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