Blockchain API hacker attack

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 At the end of 2017, when the YouTube exchange was attacked, 75% of its assets were withdrawn into the cold purse in time to avoid greater losses.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. Both indivials and enterprises can purchase alicloud servers and develop an app. However, real name authentication is required. Personal real name certification and enterprise real name certification, after passing the certification, you can easily choose cloud computing procts. Leave a message or see the content of the blog, Lao Wei has written many detailed articles, which can help you get started.

3.

Osmanthus fragrans doesn't belong to Osmanthus fragrans. Cigui, also known as Huaye tree, mouse thorn; It is a plant of Ilex family. Evergreen shrubs or small trees, landscaping tree species. It is mainly distributed in the middle and lower reaches of the Yangtze River in China

There are four groups of Osmanthus fragrans, namely Dangui, Jingui, Yingui and sijigui. Among them, Osmanthus fragrans, Osmanthus fragrans and Osmanthus fragrans all bloom in autumn and are collectively called August osmanthus. Generally, it takes at least 10 years for Osmanthus fragrans seedlings to bloom in open field. For newly transplanted seedlings, it is not allowed to apply fertilizer too early. Sowing seedlings, after two years of cultivation, the next spring can be transplanted, flowering period in ten years

4. Osmanthus fragrans is a variety with strong suitability. As long as the pruning is moderate, the water and fertilizer management is in place, and the light conditions are good, the flowering period of the year can be seen; Full flower depends on the planting conditions and management level, generally has two years of recovery period is almost
however, Osmanthus fragrans should not be planted on the roadside with poor st conditions, because the st will affect the photosynthesis of leaves and lead to non flowering
when transplanting Osmanthus fragrans, the mud head should not be scattered, and the seedlings should be planted within one day. After planting, the seedlings should be drenched in time, at least twice a day. Water should be inserted for the first time, that is, the roots should be filled with mud, pruned properly, new buds can be grown to prove survival, and fertilizer can be applied after one month, so that they can blossom in the same year

5. There is no logical relationship between impossibility and fraud and being stolen by hackers. It is not normal for hackers to steal your private key if it is placed in an unsafe place

6. 100m bandwidth has little to do with the connected computer
because the connected computers are controlled by the policy settings of the router
the most important thing is to allocate your bandwidth reasonably. In theory, if you download resources from a computer in your network segment, if your router does not allocate bandwidth, it may cause the computers in the whole network segment to get stuck on the Internet
if the distribution is reasonable and the router is powerful, then 200 computers can be easily handled.

7.

Help to confirm the rights of digital assets and stimulate innovation vitality

In the era of digital economy, data resources are becoming more and more important. In 2019, China has officially regarded data as one of the seven proction factors as important as labor, capital, land, knowledge, technology and management, and promoted the establishment of data factor market system. However, e to the difficulty of data right confirmation, data traceability and interest sharing, data can not be effectively allocated and circulated in an orderly way, which seriously restricts the development of digital economy

extended information:

precautions:

the trading volume is large, there is an undertaking in the plate, and the seal is strong. The winning rate is relatively higher as a seal. Tomorrow itself is a process of emotional weakness but secondary confirmation. Even if the market recognized seal is not the strongest turnover dragon, the possibility of premium the next day is also higher

the price performance ratio of tomorrow's sale. To put it most simply, if you wait to buy four stocks tomorrow, you only need to catch one that can change hands. Then at least we won't lose money

cognition of short-term players. For short-term trading, the biggest driving force is hot spot, which brings incremental funds. Even in the emotional game, the role played by the short runners is to blow up the bubbles so that they can be profitable. p>

8. Hackers as long as your wallet stolen, you can use your money, do not need any cattle break means

9. This requires access to professional advanced defense companies for protection. 1. It depends on whether it is DDoS traffic attack or CC attack. Traffic attack prevention is relatively rough and simple. Most companies compete with bandwidth resources for this kind of local protection. But in the event of CC attacks, few can be prevented and the protection effect is good. 2. Ruisu cloud professional network security company reserves 4T + high defense bandwidth resources. CC protection is based on the unique signature analysis technology, customized protection according to the characteristics of the attacked, and cloud protection. It is not limited to the source server area. It can quickly access our ruin protection system within 10 minutes, and can do the protection of various application systems, such as four layers and seven layers, to help a lot of chess and card Virtual currency exchange, payment, e-commerce and other well-known customers successfully resist hacker attacks. 3. Free access protection running in, protection effect is satisfied, and then the formal cooperation.