How to prevent hackers in digital currency

1.

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 dangers

1. 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 centralization

2. 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 At the end of 2017, when the YouTube exchange was attacked, 75% of its assets were withdrawn into the cold purse in time to avoid greater losses.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

2. At present, hackers are focusing on the digital currency exchange. In their eyes, it's all fat and the asset security of stealing customers' information. Many exchanges have more or less security risks. It's recommended to go to the coin exchange to transfer the property safely. The coin exchange has achieved a balance between the security system and the system efficiency. So far, there has been no major security risks

3. A decentralized digital currency storage scheme is provided for users. The wallet key and the address and private key information of all kinds of currencies are stored in the user's local system. At the same time, the wallet provides a convenient key backup scheme - users only need to backup once and save it in a safe place. Even if the types of digital currency are added subsequently, all types of digital currency assets can be recovered with backup. In addition to allowing users to fully control the key of the wallet, the wallet also provides multi signature technical support and two-step authorization verification for digital asset management of different scales. Users can choose mobile phone verification code, fingerprint, living body and other verification methods ring transfer transactions to ensure the security of digital currency assets in an all-round way.

4. The reason for the speculation of virtual currency is that it emphasizes that it has more "advantages" than traditional currencies, that is, US dollar, RMB, Japanese currency and euro. First of all, bitcoin is a kind of decentralized currency. There is no central bank to control the issuance. It is controlled by a precise computer system to achieve a stable issuance speed and a definite limited amount. It is claimed that anyone can participate in the proction. These "advantages" can be summed up as anti inflation, that is, the currency of the holder will not depreciate. If 10 bitcoin can buy a bicycle one year ago, then 10 bitcoin can still buy a bicycle one year later - sounds very attractive
although there are all kinds of new gimmicks behind bitcoin, they all adhere to the design features of bitcoin, such as decentralization, and take "anti inflation" as an important advantage. Virtual currency is not recommended

5.

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6. In fact, it's very simple. Using a kushenleng wallet to store digital currency can prevent hacker attacks. Its private key is completely not connected to the Internet, so its security is very high.

7.

The contract transaction of digital currency is not safe. There are still many loopholes in the digital currency trading platform, for example, the most common ones are as follows:

1. Denial of service attack

denial of service attack is the most important attack against the digital currency trading platform at present. Through the denial of service attack, the attacker makes the trading platform unable to access normally, while the user cannot accurately distinguish the attack degree, It often leads to panic asset transfer, which brings some loss

8. You can use procts such as kushenleng wallet to store digital currency, and use the two-dimensional code communication mode, which will not touch the network, so as to prevent hacker attacks.

9. Keep your key away from the Internet