70000btc stolen
According to several okex and okcoin users, their accounts were stolen, with losses ranging from tens of thousands to millions. According to preliminary statistics, nearly 10 users have reported losing about 600 bitcoins, worth about 20 million yuan
On September 1, some users said that they had 468 okcoin accounts, only 125 of them were left, 343 less. The user said that there is no need for any password or verification to transfer the okcoin contract account to the spot account. The developed currency to currency transaction has no depth at all and is easy to be used by the number stealing personnel. Okcoin does not provide corresponding protectionon September 16, another user transferred 30 BCC tokens stored in okex to okcoin, and on September 23, the account was invaded again, buying and selling between bitcoin, Leyte, Ethereum and RMB for many times, exhausting 30 BCCs and 27 bitcoins, trading nearly 1000 pieces in two hours, and the abnormal IP addresses were Russia and the Netherlands
"if the virtual currency property is changed into legal currency for cash withdrawal, the account is required to have real name authentication, so it is necessary to withdraw the profit in one stroke by knocking or exploding the position." Liu Chaoqun thinks that several problems of okex platform include: there is basically no trading volume of currency trading at ordinary times, and the trading volume suddenly increases a hundred times, so the platform does not do any risk control on this; There is no email or SMS verification for remote login; After the remote login reminder, immediately contact the platform, and the platform does not respond at the first time; The withdrawal speed of profit account is obviously abnormal, much higher than the normal speed
at present, the vast majority of digital currency transactions are concted in exchanges. Among the numerous exchanges, bitfinex, binance, okex and so on are well-known
However, bitcoin and other digital currencies, as decentralized assets, have to be traded in a centralized exchange, which seems to have hidden contradictions and dangers1. Problems and challenges of stock exchanges=“ //www.yuanxue365.com/en/img_fd039245d688d43fdf16c83b761ed21b0ff43bbf ">
in February 2014, Mt. GOx, the world's largest bitcoin exchange at that time, was stolen 850000 bitcoins, and the price of bitcoin suffered a" cliff "crash on that day. Later, it was revealed that Mt. GOx was in fact a thief, and only 7000 bitcoins were actually stolen
in August 2016, bitfinex, the largest U.S. dollar bitcoin trading platform, suffered a security vulnerability, resulting in the theft of 120000 bitcoins, which was worth $65 million at that time. If converted into the price in December 2017, it would be worth nearly $2 billion
on December 19, 2017, South Korea's youbit exchange was attacked by hackers and lost 4000 bitcoins, and the exchange declared bankruptcy
on December 21, 2017, the Ukrainian liqui exchange was stolen 60000 bitcoins, and the unit price of bitcoin plummeted by US $2000
in 2018, such a drama will only continue
in addition to the threat of hackers, traditional exchanges also have some inherent shortcomings, such as lack of supervision and inefficiency. The security of the exchange for investors can only rely on its own credit, and the cost of running is very low. The stock exchange is regulated at the national level, but there is no such sword of Damocles on the top of the digital currency exchange. Moreover, in an exchange, the same order can only be submitted to one exchange. After the user places an order, the funds used for the transaction will be frozen and can only wait for the completion or cancellation of the transaction. These are undoubtedly inefficient
All in all, the problems of exchanges are the problems of centralization2. Decentralization of exchanges=“ //www.yuanxue365.com/en/img_86d6277f9e2f070889a173c9e224b899a801f257 ">
(1) the progress of the exchange itself
the upgrade of security means is various. At present, the best use is cold wallet, that is, to keep the digital currency in the offline U disk. At the end of 2017, when the YouTube exchange was attacked, 75% of its assets were withdrawn into the cold purse in time to avoid greater losses. However, it seems to be a helpless way to protect the online assets by offline means. Of course, there should be many other methods, which will not be repeated here
(2) the representative of cross ledger transaction is ripple network, and the operating company is ripple labs, which is a semi centralized system. Ripple is a decentralized clearing agreement. In order to solve the high cost and delay of inter-bank clearing, its base currency is XRP. Ripple network can connect all kinds of assets, such as US dollar, RMB, Japanese yen, bitcoin, etc. to its own network. In this system, U.S. dollars or bitcoin can be converted into reborn currency, and then reborn currency can circulate freely in the network, just as a highway is built between various assets. Due to the support of major banking institutions, the reborn currency achieved nearly 300 times growth in 2017
(3) decentralized exchange
some teams try to use blockchain technology to build a decentralized exchange. This kind of decentralized exchange, to some extent, is an extension of cross ledger trading
bitshares is the most representative of early rising projects. It builds a blockchain development platform with servers scattered all over the world. Even if some of them are attacked, the system will not collapse. Anyone can transfer money and borrow money freely on this platform, and can also quickly build a centralized exchange based on this platform. In order to ensure stable value, bitstocks also require three times of digital assets as collateral. At present, bitstocks are running fairly well
later, with the development of Ethereum and smart contract, the x x protocol came into being. This is an open protocol running in the Ethereum blockchain and a decentralized exchange in the Ethereum ecosystem. The agreement has attracted many investors. At present, it has completed financing and started to build open source software tools and infrastructure. Of course, there are many competitors. Ether Delta, IDEX and oasis DEX are trying to provide similar functions. Moreover, it is a smart contract system based on Ethereum, which only supports erc20 token. If other smart contract public chains start to rise, the demand will be reced
in addition, there are some teams that are entering, such as the domestic road seal agreement, looping (LRC) in English. They adopted a design similar to the X protocol, and also introced a fast payment function similar to the lightning network. It is characterized by trying to match multiple exchanges, the user's order can be broadcast to multiple exchanges, and completed by different exchanges. Moreover, the user can still use the account funds after placing an order, and the user's behavior of transferring part or all of the funds is equivalent to partial or total cancellation. To some extent, it improves the breadth and timeliness of the transaction. However, this system seems to have damaged the "power" of the existing exchanges. Whether we can persuade everyone to play together will be a difficult problem
At present, there is still a long way to go for the construction of decentralized exchange. In 3-5 years, traditional exchange will still be the main battlefield of digital currency However, in the future, it is worth looking forward to let the decentralized digital currency get rid of the shackles of centralization it's a surprise that bitcoin's market has plummeted in the past few days, and it has fallen by $7000 in seven days. A while ago, some experts said that it's not too late to buy bitcoin in the market, and they can continue to make a lot of money! However, the people who have entered the market these days have suffered heavy losses. Is bitcoin about to collapse < HR / > < blockquote > the sharp fall of bitcoin market is really surprising! It is also reasonable for the public to worry about the collapse of bitcoin! However, this is a prediction, and it is not accurate. Only time can tell us whether bitcoin will crash in the future! Of course, we can listen to the analysis of professional knowledge in the view of analysts, the sharp decline of bitcoin is closely related to the frequent theft incidents in recent years. On December 21, the media reported that the Ukrainian bitcoin exchange liqui was attacked by hackers, resulting in 60000 bitcoins being stolen and hackers madly shipping. On December 19, youtube, a bitcoin trading platform in South Korea, was also attacked by hackers, resulting in the theft of users' funds. Due to hacker attacks, the platform lost 17% of its assets, and yapian, the parent company of youtube, immediately filed for bankruptcy protection summary: it is understood that the circulation of wax coins in the announcement of the trading platform is 185 million, while the actual circulation in the official wax platform is 1.85 billion. Instry insiders said that this is also a major negative factor in the current digital money market. Xiao Lei said that the fall is a very important turning point, rather than the "bubble" of digital money being broken, but a process of squeezing the bubble in a big way. strong>
as early as February 28, 2014, Mt. GOx, once the world's largest bitcoin dealer, filed for bankruptcy, claiming that at least 850000 bitcoins had been lost e to hackers and that it was also in debt of $65 million
the price fluctuation, security and criminal use of bitcoin are the common disputes in the development process of bitcoin. The scarcity and borderless characteristics of bitcoin make it a natural investment. It is reported that 95% of the closed bitcoin related venture projects are e to the theft of bitcoin. Due to the anonymity of bitcoin, it can hardly be recovered after being stolen.
so far, more than 80% of the platforms in the world have been stolen. Bitcoin's piggy bank was shut down because more than 3000 coins were stolen. Biter once wanted to sell the website because more than 7000 coins were stolen. Stamps have also been stolen many times. Bitstream was also stolen. Mentougou, once the world's largest bitcoin trading platform, was shut down because of the stolen bitcoin. Before many trading platforms are mostly closed because of currency theft. Therefore, the security of the trading platform needs to be strengthened.
security problems. On May 8, 2019, coin security was attacked by hackers on a large scale. Hackers obtained a large number of API keys, Google verification 2fa code and other information, and picked up 7000 BTCs at a time. The news sent BNB down 20% on the day another attack occurred on July 4, 2018, when 7000 bitcoins were suspected to have been stolen. That's the same number that was stolen in May
although yuan an has always wanted to break this situation, since the centralized exchange is restricted in the United States, it should switch to the DEX track. In April, it launched DEX, a decentralized exchange< however, the exchange was found to have security loopholes, and its 11 nodes were all controlled by the currency security system, rather than distributed. And the instry rumors spread before, Li Xiaolai satirized Zhao CHANGPENG does not understand technology. Coin an's success was only e to his good luck. The underlying technology is actually very common