Is it safe to set a lock period for the purchase of digital curr
Yin Zhentao, deputy director of the law and Finance Research Office of the Financial Research Institute of the Chinese Academy of Social Sciences, said that digital currency faces two risks. The first is the technical level. Digital currency relies on blockchain technology and a system, which will make it suffer from security impact, such as hacker attacks on computer systems. We have seen many practical problems in this process
Zhao Zhanzhan, a special researcher of intellectual property research center of China University of political science and law, believes that digital currency has anonymity, quickness and irrevocability. In addition, bitcoin and other digital currencies have high circulation in the world, so many criminals use digital currency as a new money laundering channel. Moreover, there are many different ways to realize money laundering through digital currency. Generally speaking, the probability of new money laundering being found and investigated is lower than before. Many countries have no effective means and technology to combat money laundering through digital currency. These factors lead to criminals prefer this way of money laundering
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 are the following six kinds:
1. Denial of service attack
denial of service attack is the most important attack against the digital currency trading platform at present. Through denial of service attack, the attacker makes the trading platform unable to access normally, Because users can not accurately distinguish the degree of attack, it often causes panic asset transfer, which brings some loss
2. Phishing incident
even the best technical measures at present can not make the digital currency trading platform avoid phishing attacks. Some hackers and criminals can confuse digital currency investors by means of fake domain names or fake pages, while ordinary investors can't identify the authenticity, so it's easy to cause asset losses
Many digital currency trading platforms use a single private key to protect the hot wallet. If hackers can access a single private key, they can crack the hot wallet related to the private key. For example, in the attack on yapizon of Seoul stock exchange in 2017, the attackers stole hot wallets from the trading platform twice in a year, resulting in a total loss of nearly 50% of the assets of the trading platform and eventually leading to the bankruptcy of the trading platform Fourth, e to the lack of perfect risk isolation measures, or ineffective supervision on the rights of employees, some employees who have the operation rights of the platform use internal trust to seek unjust wealth for themselves. For example, in 2016, the event of employees stealing bitcoin on shapeshift caused a total loss of US $230000 to the trading platform by stealing and reselling sensitive information to others Fifth, the software vulnerability of digital currency trading platform includes single sign on vulnerability, OAuth protocol vulnerability and so on. At present, all countries have laws requiring banks or other financial institutions to implement information security measures to protect customers' deposits. However, e to the fact that the blockchain field is still in its infancy, there is a lack of such specifications for encrypting digital assets. Therefore, it is not accidental that many trading platforms have a large number of loopholes in the absence of security constraints 6. Transaction malleability the technical supporters of blockchain often think that blockchain transactions are highly secure because they are recorded on records that are said to be unchangeable, but each transaction needs to have a corresponding signature, and the records can be forged temporarily before the final confirmation of the transaction
extended data:
rules of contract transaction
1. Transaction time
contract transaction is 7 * 24 hours transaction, which will be interrupted only ring the settlement or delivery period of 16:00 (UTC + 8) every Friday. In the last 10 minutes before delivery, the contract can only be closed, not opened
Transaction types are divided into two types, opening and closing. Opening and closing positions are divided into two directions: buying and selling:buying open long (bullish) refers to buying a certain number of contracts when users are bullish and bullish on the index. Carry out "buy open more" operation, match success will increase long position
selling pingo (multi order closing) refers to the selling contract that the user makes up for when he is no longer bullish on the future index, offsets with the current buying contract and exits the market. Carry on "sell flat much" operation, match after success, will rece long position
short selling (bearish) refers to the new sale of a certain number of certain contracts when the user is short or bearish on the index. Carry out the operation of "sell short" and increase the short position after successful matching
buy close (short single close) refers to the buy contract that the user will not be bearish on the future index market and make up for, offset with the current sell contract and exit the market. Carry out "buy short" operation, after matching successfully, short position will be reced
3. Order method
limit order: the user needs to specify the price and quantity of the order. Limit order can be used for opening and closing positions
order at opposite price: if you choose to order at opposite price, you can only enter the order quantity, not the order price. The system will read the latest competitor price at the moment of receiving the entrustment (if the user buys, the competitor price is the selling price of 1); If it is a sell, then the counter price is buy 1 price). Issue a price limit order for this counter price
4. Position
the user owns the position after opening and trading, and the positions in the same direction of the same contract will be merged. In a contract account, there can only be 6 positions at most, that is, multiple positions of current week contract, short positions of current week contract, multiple positions of next week contract, short positions of next week contract, multiple positions of quarterly contract and short positions of quarterly contract
5. Order restriction
the platform will restrict the number of single user's positions in a certain period of contract and the number of single open / close positions, so as to prevent users from manipulating the market
when the number of positions or entrustments of users is too large, the platform has the right to require users to take risk control measures, including but not limited to cancellation of orders, closing positions, etc. The platform has the right to adopt measures including but not limited to limiting the total number of positions, limiting the total number of consignments, limiting the opening of positions, withdrawing orders, forcibly closing positions, etc. for risk control
construction site: ares square, Paris, France
commencement time: January 27, 1887
completion time: March 31, 1889
floor area: 10000 square meters
building height: 324.79m
total building weight: about 10100t
building storey: 4 floors
number of light bulbs: 20000
structural form: steel frame hollow structure
Construction cost: 7.457 million francs
investment unit: French government
Designer: staff Eiffel
construction purpose: restaurant, sightseeing
English Name: Eiffel Tower
French name: La Tour Eiffel
nickname: Paris tower
Eiffel Tower has been built since 1887, which is divided into three floors, 57.6 meters above the ground, 57.6 meters above the ground, 57.6 meters above the ground, 57.6 meters below the ground, 57.6 meters above the ground, 57.6 meters above the ground, 57.6 meters above the ground, 57.6 meters above the ground, 57.6 At 115.7m and 276.1m, there are restaurants on the first and second floors, and a viewing platform on the third floor. There are 1711 steps from the tower base to the top of the tower, with 7000 tons of steel, 12000 metal parts and 2.5 million rivets. On May 15, 1889, in order to cut the ribbon for the opening ceremony of the world exposition, the designer of the iron tower, Gustav; Eiffel personally raised the French flag to the height of 300 meters above the tower. In order to commemorate his contribution to France and Paris, people especially created a bust for him under the tower
until January 16, 2004, in order to bid for the 2012 Summer Olympic Games, the Paris municipal government of France specially introced its preparations for the Olympic bid on the Eiffel Tower, and the Eiffel Tower has become a "natural advertisement" for the country's Olympic bid
this metal building, completed for the World Expo, was the tallest building in the world for 45 years until the emergence of the Empire State Building in New York
it is connected and fixed by 1.5 million rivets. It is said that its pressure on the ground is only as great as that of a person sitting in a chair. On the four sides of the tower, 72 scientists' names are engraved, all of which are engaged in research to protect the tower from being destroyed
the Eiffel Tower is one of the symbols of Paris, which is called "Iron Lady" by the French. Together with the Empire State Building in New York and the TV Tower in Tokyo, it is known as the three most famous buildings in the world
in 1889, the 100th anniversary of the French Revolution, Paris held a large-scale international exposition to celebrate. The most eye-catching exhibit of the Eiffel Tower in the Expo is the Eiffel Tower. It became the symbol of the instrial revolution sweeping the world at that time
the designer of the Eiffel Tower is French architect Gustav Eiffel. In his early years, he was famous as a drybridge expert. In his life, he has many outstanding works all over the world, but it is the tower named after him that makes him famous all over the world. In his own words, the Eiffel Tower "drowned me, as if I had just built her all my life.". At the beginning, although the French government decided to build the world's tallest tower in Paris, it provided only one fifth of the cost. In order to realize his design, Eiffel mortgaged his construction engineering company and all his property to the bank as project investment
on January 28, 1887, the Eiffel Tower was officially started. 250 workers worked 8 hours a day in winter and 13 hours a day in summer. Finally, on March 31, 1889, the steel tower was completed. The Eiffel Tower is made up of a lot of scattered pieces - it looks like a bunch of model components. However, these fragments are not plastic, but metal. There are 18038 pieces, weighing 7000 tons. During the construction, 7 million holes were drilled and 2.5 million rivets were used. Because each part of the tower is strictly numbered in advance, there is no mistake in the assembly. The construction is carried out in accordance with the design completely, and no changes are made ring the construction. It can be seen that the design is reasonable and the calculation is accurate. According to statistics, there are more than 5300 design sketches of the tower alone, including 1700 full drawings
the Eiffel Tower is 300 meters high after its completion. Until 1930, it was the tallest building in the world. Today, radio and television antennas are added to the tower, with a total height of 320 meters. Standing on the tower, the whole of Paris is at your feet. Every day, tourists from all over the world come to visit. By 1988, "Iron Lady" had welcomed 123 million tourists from five continents< On March 31, 1989, the Eiffel Tower was 100 years old. For this reason, the Paris tower management company specially presided over a grand commemorative activity, which reproced the historical scene of Eiffel leading the people to the summit 100 years ago: wearing a black dress, wearing a wide brimmed hat, holding a national flag, "Eiffel" and 30 "celebrities" and "construction workers" Rose to the top in the grand drum music. When he put the tricolor flag on the top of the tower, 21 gun salutes, pigeons flying around the tower, and colored balloons floating into the blue sky. On the fence of the platform on the second floor of the iron tower, there is a colorful banner of "Celebrating the 100 year old of the iron tower" written in the words of all countries in the world. Countless tourists have been looking forward to the spectacle. The Eiffel Tower has experienced a hundred years of wind and rain. After the overhaul in the early 1980s, it still stands on the Seine River. It is the pride of all the French people
the Eiffel Tower, covering an area of one hectare, stands on the Ares square by the Seine River in downtown Paris. In addition to the four feet are made of reinforced concrete, the whole body is made of steel, with a total weight of 7000 tons. The tower is divided into three layers, the first layer is 57 meters high, the second layer is 115 meters, and the third layer is 274 meters. Except that there is no gap in the third floor platform, all other parts are permeable. There are 1711 steps from the tower base to the top of the tower. Now the elevator is installed, so it is very convenient. There are bars and restaurants on each floor for tourists to take a rest and enjoy the unique panoramic view of Paris: when the sky is clear, you can see the scenery as far as 70 km. Eiffel, the designer of the tower, said when he delivered the drawings: "only proper paint can guarantee the life of the metal building." This sentence is very suitable for the maintenance of iron lady. Is it more suitable for the maintenance of people's emotions: meticulous care, good beginning and good ending, which is the beauty of the world.