Exchange total loss money by hacked is about
$ 4,537,169,839.39
Exchange : 74 hack event(s)
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2020-08-04
Hacked target: Opyn
Description of the event: On-chain options platform Opyn disclosed that its Ethereum put options were maliciously used by external participants. Opyn pointed out that all other Opyn contracts except Ethereum put options are not affected by this vulnerability. The attacker doubled the use of oToken and stole the pledged assets of the put option seller. According to Opyn statistics, a total of 371,260 USDC has been stolen so far. The Opyn team conducted a white hat hacking attack based on the Convexity Protocol and successfully recovered 439,170 USDC from the unpaid vault to further reduce the loss. Currently, the Opyn team has withdrawn its liquidity from Uniswap's Ethereum bearish capital pool and is investigating the situation.
Amount of loss: 371,260 USDC Attack method: Double use oToken -
2020-07-31
Hacked target: 2gether
Description of the event: Spanish cryptocurrency payment application and credit card issuer 2gether announced that hackers stole $ 1.4 million last Friday (July 31) and the company could not immediately repay users affected by the attack. This trading platform will use the native token 2GT to compensate users.
Amount of loss: $ 1,400,000 Attack method: Unknown -
2020-07-12
Hacked target: Cashaa
Description of the event: Cashaa, a UK-based cryptocurrency exchange, said hackers stole 336 Bitcoins from a wallet on the exchange. The company has now stopped all transactions related to cryptocurrency.
Amount of loss: 336 BTC Attack method: Unknown -
2020-06-10
Hacked target: DeversiFi
Description of the event: The new version of DeversiFi encountered a vulnerability in less than a week after it was launched. The official said that it would be fixed as soon as possible. The cause of this vulnerability was that a trader tried to submit an order larger than the limit, and the logic of why the system designed order limit is to avoid user's misoperation. After that, the system still repeatedly submitted the order, but it was continuously rejected by the system, which affected the processing of other orders.
Amount of loss: - Attack method: System design defect -
2020-05-07
Hacked target: Loopring
Description of the event: Loopring has appeared a serious front-end error, the private key material is set within a range of 32-bit integer, you can find all user private key pairs by brute force method, due to the user's EdDSA key pair is actually limited to a space of 32-bit integer, the hacker can find out the EdDSA key pair of all users by brute force method. Affected by this, Loopring Exchange shut down for half a day for maintenance and upgrade.
Amount of loss: - Attack method: System design defect -
2020-05-06
Hacked target: Youbi
Description of the event: According to the official news from Youbi Exchange, Youbi has encountered heavy network-traffic DDOS attacks for three consecutive days since the platform coin subscription was launched on May 06, which caused the server to be inaccessible in a short time.
Amount of loss: - Attack method: DDOS attack -
2020-05-01
Hacked target: 币星
Description of the event: -The official announcement of BitSG Exchange stated that its websites bitsg and app suffered from uninterrupted DDOS continues attacks, resulting in the inability to log in normally during certain periods.
Amount of loss: - Attack method: DDOS attack -
2020-04-08
Hacked target: Bisq
Description of the event: Hacker Exploits Flaw in Decentralized Bitcoin Exchange Bisq to Steal $250K
Amount of loss: $250,000 Attack method: Unknown -
2020-02-17
Hacked target: VBITEX
Description of the event: VBITEX platform was hacked, resulting in malicious manipulation of platform data and theft of virtual assets.
Amount of loss: - Attack method: Unknown -
2020-02-05
Hacked target: Altsbit
Description of the event: Altsbit, a small cryptocurrency exchange that lost “almost all funds” in hack on Feb. 5. Altsbit lost about $70,000 in Bitcoin and Ether
Amount of loss: $70,000 Attack method: Unknown -
2019-11-27
Hacked target: Upbit
Description of the event: Crypto Exchange UpBit Confirms Theft of 342,000 Ether — $50M
Amount of loss: 342,000 ETH Attack method: Unknown -
2019-11-08
Hacked target: VinDAX
Description of the event: The cryptocurrency exchange VinDAX was hacked and lost at least $5 million in cryptocurrency
Amount of loss: $5,000,000 Attack method: Unknown -
2019-11-01
Hacked target: BitMEX
Description of the event: BitMEX Compromises User Data in Email Gaffe.
Amount of loss: - Attack method: Unknown -
2019-09-14
Hacked target: Coinhouse
Description of the event: Coinhouse Suffers Phishing Attack, User Names and Emails Accessed.
Amount of loss: - Attack method: phishing attack -
2019-08-17
Hacked target: CoinTiger
Description of the event: Cold wallets stolen from the CoinTiger exchange, 400 million PTT's in the wallet disappeared.
Amount of loss: 401,981,748 PTT Attack method: Unknown -
2019-08-13
Hacked target: Bitstamp
Description of the event: There is a vulnerability in Bitstamp, which can be used by attackers to view a large number of sensitive information such as user IDs and bank CARDS, seriously threatening the information security of users.
Amount of loss: - Attack method: Unknown -
2019-07-25
Hacked target: YouHodler
Description of the event: The cryptocurrency lending company YouHodler was affected by a data leak that contained information about users on its platform. Some of the data that was released to the market includes bank accounts, passport numbers, card numbers and many other things.
Amount of loss: - Attack method: Unknown -
2019-07-24
Hacked target: QuickBit
Description of the event: According to QuickBit, the breach resulted in data of users such as names, emails, physical addresses and even card information was exposed. The exchange has said it has estimated about 2% user data was left unprotected. The exchange has claimed that although data was bare and accessible to anyone who had the knowledge on how to access it, none of the data has been affected or copied.
Amount of loss: - Attack method: Unknown -
2019-07-11
Hacked target: BitPoint
Description of the event: Bitpoint, a licensed cryptocurrency exchange based in Japan, has been hacked for $32 million in crypto assets.
Amount of loss: 1,225 BTC, 1,985 BCH, 1,169 ETH, 5,108 LTC, 28,106,343 XRP Attack method: Unknown -
2019-07-08
Hacked target: Bitmarket
Description of the event: On July 8, the Polish-based exchange Bitmarket abruptly shut down due to liquidity issues. The shutdown allegedly cost users a total of 2300 bitcoin (approximately $23 million) according to Polish prosecutors. The exchange’s official site was replaced with the following message: “We regret to inform you that due to the loss of liquidity, from 08/07/2019, Bitmarket.pl/net was forced to cease its operations. We will inform you about further steps.” Two weeks later, one of the exchange's co-owners was found shot dead
Amount of loss: 2300 BTC Attack method: Unknown -
2019-07-04
Hacked target: Soxex
Description of the event: Soxex exchange has been exposed to abscond with the funds. At present, the website of the exchange has been unable to open, and hundreds of millions of funds of investors have been swept away, involving BTC, ETH, HT, OKB and other mainstream currencies. Over 1 million USDT has been flowing into other exchanges.
Amount of loss: - Attack method: Unknown -
2019-06-27
Hacked target: Bitrue
Description of the event: At approximately 1am June 27 (GMT+8), a hacker exploited a vulnerability in Bitrue's Risk Control team's 2nd review process to access the personal funds of about 90 Bitrue users. The hacker used what they learned from this breach to then access the Bitrue hot wallet and move 9.3 million XRP and 2.5 million ADA to different exchanges.
Amount of loss: 9,300,000 XRP; 2,500,000 ADA Attack method: Unknown -
2019-06-27
Hacked target: Bitsane
Description of the event: According to Forbes on June 27, Bitsane, an Irish cryptocurrency exchange, disappeared without a trace last week, had lied to as many as 246000 users.
Amount of loss: - Attack method: Unknown -
2019-06-25
Hacked target: Synthetix
Description of the event: Synthetix, a synthetic asset issuance platform built on Ethereum, experienced an oracle attack which netted the attacker over 37 million sETH, according to Etherscan. However, the true dollar value is difficult to calculate at this time given the relative illiquidity of sETH on secondary markets.
Amount of loss: 35,759,524 sETH Attack method: oracle attack -
2019-06-03
Hacked target: Coinroom
Description of the event: Polish Coinroom exchange shuts down and disappears with customers funds
Amount of loss: - Attack method: Unknown -
2019-06-02
Hacked target: Kraken
Description of the event: On June 2, Bitcoin flash-crashed on a major Bitcoin trading platform Kraken. The near vertical drop from $11,200 CAD to $100 CAD within moments initially appeared to have resulted from a technical glitch or a fat-fingered trading error by a whale. In this case, the available evidence suggests a hacker compromised a whale’s account, stole 1200 BTC worth $10.45 million on that date, and then dumped this huge amount of BTC into a highly illiquid BTC/CAD marke.
Amount of loss: 1200 BTC Attack method: Flash Crashes -
2019-05-29
Hacked target: Remitano
Description of the event: False XRP deposit.
Amount of loss: - Attack method: Unknown -
2019-05-22
Hacked target: Coinbase
Description of the event: Hackers steal $100,000+ worth of BTC from engineering manager at Crypto Custodian BitGo. Sean Coonce, engineering manager at cryptocurrency custodian BitGo. According to the post, Coonce had over $100,000 siphoned out of his account on cryptocurrency exchange Coinbase in under 24 hours. Coone details SIM swapping, a practice that sees the attacker maliciously requesting a telecommunications carrier to redirect the traffic of a mobile phone number to a device over which they have control.
Amount of loss: $100,000 Attack method: SIM hijacking -
2019-05-08
Hacked target: Binance
Description of the event: Binance has discovered a large scale security breach today, May 7, 2019 at 17:15:24 (UTC). Hackers were able to obtain a large number of user API keys, 2FA codes, and potentially other info. The hackers used a variety of techniques, including phishing, viruses and other attacks. And the hackers were able to withdraw 7000 BTC. Link: https://binance.zendesk.com/hc/en-us/articles/360028031711-Binance-Security-Breach-Update
Amount of loss: 7074 BTC Attack method: Unknown -
2019-05-02
Hacked target: BitoPro
Description of the event: Taiwan exchange BitoPro's XRP suffered an attack that caused a price crash and is thought to have lost about 7m XRPS.
Amount of loss: 7,000,000 XRP Attack method: False top-up -
2019-04-26
Hacked target: Bitfinix
Description of the event: Bitfinix transferred about $1 billion of its own and client money to Crypto Capital, which is also said to hold funds from other exchanges such as QuadrigaCX. However, starting from August last year, Crypto Capital refused to provide withdrawal service for customers and refused to return funds to Bitfinix exchange. So far, Crypto Capital has a total of $851 million of funds has not been returned to Bitfinex.
Amount of loss: 851,000,000 USD Attack method: Unknown -
2019-03-29
Hacked target: Bithumb
Description of the event: According to a report from CoinDesk Korea, the exchange was hacked for a total of 3.1 million EOS, which was withdrawn from the exchange’s “hot” (internet connected) wallet through a series of transactions. Based on the data from CoinMarketCap, EOS is currently trading at $4.22, making the total value of the coins lost around $13 million. The company said in its statement that it suspects the hack was conducted by an insider, since no evidence of external exploit has been found.
Amount of loss: 3,132,672 EOS Attack method: Unknown -
2019-03-29
Hacked target: Bithumb
Description of the event: According to a report from CoinDesk Korea, Bithumb may have also lost 20.2 million XRP in the recent breach. The XRP was moved from Bithumb’s wallet on March 29 in transactions that can be seen on XRPSCAN.
Amount of loss: 20,172,060 XRP Attack method: Unknown -
2019-03-26
Hacked target: BiKi
Description of the event: BiKi.com announced that at 0:08:23 on March 26, the BiKi.com community received a user feedback that his password has been tampered with and need to bind the new Google verification code.At around 5 in the morning, 28 users had the same problem, and the risk control system received an alarm. After investigation, it is because some users are not bound to Google verification code and third-party verification code service provider SMS is hijacked and caused. At present, the number of of accounts that have been tampered with passwords is 37, and the account involved in asset transfer is 18, and the loss amount is 12.33 million USDT, the BiKi.com will bear the full amount of the loss.
Amount of loss: 123,300 USDT Attack method: unknown -
2019-03-26
Hacked target: CoinBene
Description of the event: Crypptocurrency expert Nick Schteringard said on Twitter yesterday, that the hacker appears to have stolen roughly $6 million in Coinbene Coin and $39 million in Maximine Coin, which it later dumped on the market.
Amount of loss: 45,000,000 USD Attack method: Unknown -
2019-03-24
Hacked target: DragonEx
Description of the event: DragonEx announced the news on its official Telegram channel on Monday, stating that, on Sunday, March 24, it had suffered a cyberattack that saw cryptocurrency funds owned by users and the exchange “transferred and stolen.” In updates on the hack today, DragonEx’s Telegram admin provided wallet addresses for 20 cryptocurrencies to which the stolen funds had apparently been transferred. The list included the top five cryptos by market capitalization: bitcoin (BTC), ether (ETH), XRP, litecoin (LTC) and EOS, as well as the tether stablecoin (USDT) for which six destination addresses were provided.
Amount of loss: ~ 6,028,283 USD Attack method: Unknown -
2019-03-24
Hacked target: Etbox
Description of the event: The Etbox platform wallet was hacked, causing the platform’s digital assets to be stolen
Amount of loss: 132,000 USD Attack method: unknown -
2019-03-15
Hacked target: Mercatox
Description of the event: The attacker launched a hard_fail attack on the exchange and profited thousands of EOS.
Amount of loss: - Attack method: Hard_fail attack -
2019-02-20
Hacked target: Coinbin
Description of the event: Coinbin, a south Korean cryptocurrency exchange, is filing for bankruptcy with losses equivalent to more than $26 million after its debts grew after employees embezzled money.
Amount of loss: 26,000,000 USD Attack method: Employee Embezzlement -
2019-02-04
Hacked target: QuadrigaCX
Description of the event: Canada's largest cryptocurrency exchange is seeking creditor protection after losing about $190 million worth of cryptocurrency after the sudden death of its founder and chief executive in December.
Amount of loss: 195,000,000 Attack method: Founder and CEO suddenly died -
2019-01-26
Hacked target: LocalBitcoins
Description of the event: LocalBitcoins has detected a security vulnerability - an unauthorised source was able to access and send transactions from a number of affected accounts.It was related to a feature powered by a third party software, and stop the attack. At the moment, we are determining the correct number of users affected - so far six cases have been confirmed.
Amount of loss: $27,000 Attack method: Unknown -
2019-01-04
Hacked target: Cryptopia
Description of the event: Cryptopia is a cryptocurrency exchange based out of New Zealand. On January 14th, 2019, they suffered a breach:14th January 2019, the Cryptopia Exchange suffered a security breach which resulted in significant losses. Once identified by staff, the exchange was put into maintenance while we assessed damages. Estimates put the losses at $2.5m-$13m USD in Ethereum and ERC20 tokens being stolen. Two law enforcement press releases were issued. Funds were seen to be exfiltrated to several exchanges for laundering, as noted in this Binance tweet.
Amount of loss: 16,000,000 USD Attack method: Unknown -
2018-11-07
Hacked target: GATE.IO
Description of the event: Hackers successfully sandwiched crypto-stealing code into the middle of a popular web traffic-measuring plugin from StatCounter, which is now used on more than two million websites, including government sites. They have determined, however, that the rather wide swath of infections may have been designed to eventually infect cryptocurrency trading sites, and that the scheme did, in fact, infect popular crypto-trading site Gate.io. By situating the code in the middle of StatCounter’s downloadable javascript web traffic analysis tool, hackers made it harder to detect.
Amount of loss: - Attack method: Third-party JavaScript is hijacked -
2018-10-28
Hacked target: MapleChange
Description of the event: MapleChange, based in Canada, announced on Twitter the exchange "sustained a hack" and was investigating the issue. The post also said the exchange had turned off users' accounts temporarily. About refunding its customers, it opened a Discord server (a platform for users to chat) so customers could post there about their missing funds, based on which it would initiate refunds. The exchange's website was down.
Amount of loss: 913 BTC Attack method: Unknown -
2018-10-20
Hacked target: TRADE.IO
Description of the event: Trade.io confirmed via their Medium blog that someone or some entity gained access to the assets, resulting in over 50 million in Trade (TIO) tokens being stolen from the firm’s cold storage wallets. The 50 million tokens are valued at $7.5 million at the current $0.15 price per TIO. The ongoing investigation has revealed that some of the TIO tokens had made their way to cryptocurrency exchanges Bancor and Kucoin. Kucoin has suspended TIO transactions, while Bancor has permanently removed TIO.
Amount of loss: 50,000,000 TIO Attack method: Unknown -
2018-09-14
Hacked target: ZAIF
Description of the event: Hackers with unauthorized access to the exchange’s hot wallets had stolen roughly $60 million in bitcoin, bitcoin cash, and MonaCoin. That being said, the exact amount of bitcoin cash stolen remains unknown.
Amount of loss: ~ 59,000,000 USD Attack method: Unknown -
2018-07-26
Hacked target: KICKICO
Description of the event: KICKICO has experienced a security breach, which resulted in the attackers gaining access to the account of the KICK smart contract — tokens of the KICKICO platform. The team learned about this incident after the complaints of several victims, who did not find tokens worth 800 thousand dollars in their wallets. During the investigation, it was found that the total amount of stolen funds is 70,000,000 KICK, which at the current exchange rate is equivalent to $ 7.7 million.
Amount of loss: 7,000 KICK Attack method: Unknown -
2018-06-21
Hacked target: Bithumb
Description of the event: The attacker stole $30 million worth of cryptocurrency from Bithumb, Korea's largest cryptocurrency exchange. According to Japanese Cointelegraph, the attackers hijacked Bithumb's popular (online) wallet.
Amount of loss: 30,000,000 USD Attack method: Unknown -
2018-06-12
Hacked target: Coinrail
Description of the event: Coinrail acknowledged the existence of “network intrusion” in its system and estimated that 40 billion won ($37.2 million) worth of coins were stolen. The police are investigating violations but have not announced further details.
Amount of loss: 37,200,000 USD Attack method: Network intrusion -
2018-05-21
Hacked target: TAYLOR
Description of the event: TAYLOR’ve been hacked and all of our funds have been stolen. Not only the balance in ETH (2,578.98 ETH), but also the TAY tokens from the Team and Bounty pools. The only tokens that were not stolen are the ones from the Founders’ and Advisors’ pools, because there’s a vesting contract making them inaccessible for now.
Amount of loss: 2578.98 ETH Attack method: Unknown -
2018-04-12
Hacked target: COINSECURE
Description of the event: A failed cold storage restoration exercise seems to have exposed private keys intended for offline storage (effectively making them online). However, the CEO has expressed an insider’s involvement. Police found private keys exposed online for more than 12 hours.
Amount of loss: 438 BTC Attack method: Unknown -
2018-03-07
Hacked target: Binance
Description of the event: Binance security incident occurred in March 2018 when a phishing campaign impacted a large number of Binance users. At the time, Binance offered a $250,000 reward for any information that would have led to the arrest of those involved in the phishing campaign.
Amount of loss: - Attack method: Unknown -
2018-02-12
Hacked target: BitGrail
Description of the event: BitGrail claims that $195 million of customers have stolen cryptocurrencies in Nano (XRB).
Amount of loss: 195,000,000 USD Attack method: Unknown -
2018-01-26
Hacked target: Coincheck
Description of the event: Unidentified assailants stole 523 million NEM coins (about $534 million) from the exchange's hot wallet. According to Coincheck, NEM coins are kept on a single-signature hot wallet instead of a more secure multi-signature wallet, and the stolen coins are confirmed to be Coincheck customers.
Amount of loss: 534,000,000 USD Attack method: Unknown -
2017-12-19
Hacked target: YOUBIT
Description of the event: In the wee hours of December 19, Youbit was dealt a death blow in the form of another hack. The exchange, which was also hit in April, is closing down in the fallout of the most recent attack. As revealed on its website, they had been forced to terminate its services after suffering another hack. The hackers ran off with 17% of Youbit’s funds, enough to drive the exchange into bankruptcy.
Amount of loss: - Attack method: Unknown -
2017-12-08
Hacked target: Nicehash
Description of the event: Nicehash appears to have shuttered their website with a notice saying “a security breach involving NiceHash website” and “our payment system was compromised and the contents of the NiceHash Bitcoin wallet have been stolen”.
Amount of loss: 4736.42 BTC Attack method: Unknown -
2017-11-21
Hacked target: Tether
Description of the event: Hacked, $10 million worth of bitcoin stolen.
Amount of loss: 31,000,000 USD Attack method: Hacker break-in -
2017-09-10
Hacked target: Control-Finance
Description of the event: On June 18,2019, the US Commodity Futures Trading Commission (CFTC) announced it had initiated a civil enforcement action against a now-defunct cryptocurrency trading and investment company for misappropriating $147 million worth of Bitcoin. The Complaint charges the defendants—Control-Finance Limited and its principal, Benjamin Reynolds—with exploiting public enthusiasm for crypto assets by fraudulently obtaining and misappropriating at least 22,858.822 Bitcoin from more than 1,000 customers through a classic (HYIP) Ponzi scheme called the Control-Finance Affiliate Program.
Amount of loss: 22,858.822 BTC Attack method: Unknown -
2017-07-26
Hacked target: BTC-e
Description of the event: 66,000 BTCs worth $990 million.
Amount of loss: 990,000,000 USD Attack method: Unknown -
2017-07-19
Hacked target: Coindash
Description of the event: Hacker steals $7.4 million in ethereum during CoinDash ICO launch. At the time of the ICO, in which CoinDash posted a string of characters which represented its wallet address for investors to send funds to, it appears that the hacker compromised the website and changed this text to a wallet they control. It was a matter of minutes before the platform realized the security breach had taken place and warned investors, but it was too late -- and now the stolen funds intended for CoinDash are simply sitting in a wallet awaiting collection.
Amount of loss: 7,400,000 USD Attack method: Destroy the website, replace the address. -
2017-06-21
Hacked target: Bithumb
Description of the event: Bithumb is one of the five largest bitcoin exchanges in the world. Hackers succeeded in grabbing the personal information of 31,800 Bithumb website users, including their names, mobile phone numbers and email addresses. The exchange claims that this number represents approximately three percent of customers. And the exchange further claims that the breach was made to a personal computer belonging to an employee, and not the exchange’s internal network, servers nor digital currency wallets. Attackers appear to have stolen enough credentials to begin a process of “voice phishing,” where the scammers call up victims one at a time and pose as representatives of Bithumb.
Amount of loss: 1,000,000 USD Attack method: Phishing -
2017-04-27
Hacked target: Yapizon
Description of the event: Yapizon, a South Korean Bitcoin exchange, announced last week it lost 3831 Bitcoin (over $5.5 million) after an unknown hacker breached its system and stole funds from its server.
Amount of loss: 3,831BTC Attack method: Unknown -
2016-08-03
Hacked target: Bitfinex
Description of the event: Nearly 120,000 units of digital currency bitcoin worth about $72 million was stolen from the exchange platform Bitfinex in Hong Kong. There is still unknown how did it happended.
Amount of loss: 119,756 BTC Attack method: Unknown -
2016-05-14
Hacked target: Gatecoin
Description of the event: Gatecoin experienced a cyberattack on its hot wallets that resulted in the loss of funds. A new update from the exchange team indicated that as much as $2m was lost, confirming rumors that circulated soon after the hack became apparent. Gatecoin has claimed that it lost as much as 185,000 ethers and 250 bitcoins, an amount worth roughly $2.14m at press time.
Amount of loss: 2,000,000 USD Attack method: Server is hacked -
2015-02-18
Hacked target: KipCoin
Description of the event: KipCoin announced that the attacker gained access to the server in 2014 and downloaded the wallet.dat file. A few months later, the attacker stole more than 3,000 BTC.
Amount of loss: ~ 3000 BTC Attack method: Server is hacked -
2015-02-17
Hacked target: BTER
Description of the event: BTER announced that it lost 7,170 BTC (then worth $1.75 million). The company claims that BTC was stolen from a cold wallet.
Amount of loss: 1,750,000 USD Attack method: Cold wallet stolen -
2015-01-09
Hacked target: Bitstamp
Description of the event: Bitstamp reported that multiple operating wallets were damaged, resulting in the loss of 19,000 bitcoins. The company was hacked by multiple phishing attacks in the months before the attack. An employee downloaded a malicious file that allowed an attacker to access the password of the company's hot wallet and the server including the wallet.dat file.
Amount of loss: 19,000 BTC Attack method: Phishing -
2014-08-15
Hacked target: BTER
Description of the event: Managed server was attacked.
Amount of loss: 1,650,000 USD Attack method: Managed server was attacked -
2014-07-14
Hacked target: MintPal
Description of the event: MintPal announce that the attacker stole 8 million VeriCoins ($1.8 million) from the company's hot wallet. The attacker exploited a vulnerability in its system that allowed them to bypass the security controls to withdraw funds.
Amount of loss: 1,800,000 USD Attack method: Unknown -
2014-03-04
Hacked target: Poloniex
Description of the event: Digital currency exchange Poloniex, which trades bitcoin and other popular digital currencies such as litecoin, namecoin and dogecoin, has lost 12.3% of its total bitcoin supply in an attack. The exchange took to Bitcoin Forum on 4th March to report it had been compromised by a previously unknown vulnerability in its coding.
Amount of loss: 97 BTC Attack method: Unknown -
2014-02-24
Hacked target: Mt. Gox
Description of the event: The first one happened in June 2011 when the hacker was able to get ahold of Mt.Gox’s auditor’s credentials and transferred 2609 bitcoins to an address for which Mt. Gox had no keys. This led to the suspension of Mt. Gox operations for several days; but they sustained themselves in the market, and they were able to regain the trust of users. On 24 February 2014, the exchange suspended all trading and the website went offline. That same week, a leaked corporate document claimed that hackers had raided that Mt. Gox exchange and stole 744,408 bitcoins belonging to Mt. Gox customers, as well as an additional 100,000 bitcoins belonging to the company, resulting in the exchange being declared to be insolvent.
Amount of loss: 850,000 BTC Attack method: Unknown -
2014-02-07
Hacked target: MtGox
Description of the event: MtGox was hacked. Losses totalled 850,000 BTC, worth $470m at the time.
Amount of loss: 850,000 BTC Attack method: Unknown -
2012-09-05
Hacked target: Bitfloor
Description of the event: Bitfloor, the fourth largest exchange dealing in US dollars, has just announced[1]that it has been hacked, and the service has taken a loss of 24,000 BTC, worth about $250,000 at the time of the theft.
Amount of loss: 24,000 BTC Attack method: Unknown -
2012-05-14
Hacked target: Bitcoinica
Description of the event: Bitcoinica was hacked twice in 2012. Hackers stole a total of 61,000 BTC, leading to the bankruptcy of Bitcoinica.
Amount of loss: 61,000 BTC Attack method: Unknown