Is bitcoin on QQ
the problem of double spending is that a sum of money can be spent twice, three times and many times. Why has the double flower problem become such an important issue in the bitcoin system
the reason is that bitcoin is a virtual currency. It is virtual, presented in the form of code, and can be copied. Once the code vulnerability is broken, the same bitcoin can be recycled. In this way, the "money" of bitcoin will become very weak
let's think about it. If a sum of money can be spent many times, and you have 500 yuan, you can buy a 500 yuan dress, which can be recycled, and then buy a pair of 500 yuan shoes. In this way, can money be called money
therefore, when Nakamoto set up the bitcoin system, all his technical means are basically around solving the "double flower problem" of
, to protect bitcoin as a kind of currency, its own function as a means of payment
in fact, the problem of double spending is not a problem in our present centralized world, because with banks, the settlement of money transactions is through banks, which is very safe. If you have problems, you can go to the bank directly
however, in the decentralized world, without such a central institution as banks, it is necessary to ensure that a sum of money can only be spent once. How to eliminate the "double spending problem" under the premise of decentralization is a difficult problem
let's just say, why is Nakamoto so persistent in pursuing "decentralization" and asking for trouble? No, he hopes to solve some social problems through decentralization, the most important of which is the inflation caused by the excessive issuance of money by the authority
so, let's sum up his logic: centralized currency issuance leads to inflation - so we need to achieve Decentralization - decentralization will face many problems, the biggest problem is the double flower problem - so we need to solve the double flower problem - how to solve the double flower problem
here, Nakamoto introces the concepts of utxo and "timestamp" to solve the double flower problem
in forging, you can choose to forge Demon Armor and spirit armor (no matter which branch is forged, Dragon Armor will be forged in the end). When skill points are added, as long as there are enough materials, these high armor can be forged
to forge a good equipment, you need to enchant it, as long as you have soul stone and enchant skills
help with forging: an old man in the backyard of the comrades in arms group can help with forging as long as he is given money. Or melt the equipment you don't need to make iron blocks for forging
Enchantment: you can learn the corresponding enchantment methods and improve the enchantment ability after resolving magic weapons.
1. If it's a spot purchase, you can see how much the handling charge is, so you can work out how much the selling price is to keep the principal
2. If it's a contract play, it may be related to the leverage ratio, which will also be displayed on the platform, some will automatically calculate, some may need to calculate by themselves, very simple
investment skills of bitcoin price trend analysis
Since Xiaolu entered the circle, people often ask Xiaolu what is the difference between q-coin and bitcoin. Emmm, although the answer to this question is very simple, it's a bit troublesome to explain it. So Xiaolu should write an article today to explain it well
I don't know what fawn said. Do you understand? If you have any questions, please leave a message and communicate with Xiaolu
Shared travel refers to a new mode of transportation in which people do not need to own the ownership of the vehicle, share the vehicle with other people in the way of sharing and carpooling, and pay the corresponding toll according to their own travel requirements
including a large number of innovative models represented by taxi software and bike sharing. On the one hand, the mode of shared travel meets the self driving demand of consumers
on the other hand, it avoids the waste caused by the inefficient use of idle vehicle resources, which shows that shared travel has graally become the public's travel choice
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extended data
with the rapid spread of bike sharing in major cities across the country, the concept of "sharing economy" is rapidly popularized, and car sharing has also quietly entered people's vision
these car sharing platforms are also like the development mode of bike sharing. They are first distributed in Beijing, Shanghai, Guangzhou and other large cities. Although the number of vehicles and outlets put on each platform is small, they have caused certain repercussions in the market
However, the birth of new things still needs to adapt to the actual social situationon June 1, 2017, the Ministry of transport, together with the Ministry of housing and urban rural development, formulated the guidance on promoting the healthy development of the car rental instry (Exposure Draft) (hereinafter referred to as the exposure draft) to solicit public opinions for a period of two weeks
the draft clearly states that it encourages the development of time-sharing rental cars, and puts forward corresponding regulatory requirements and incentive policies for operating enterprises and users. Compared with the pace of the previous regulatory policies on online car hailing and bike sharing, the regulatory authorities responded more quickly to car sharing this time. The policy is coming, and the instry is developing towards a more standardized direction
However, e to the high operating costs and the difficulty of making profits, the capital boom in the field of shared automobile has not yet arrived. Under the background of the initial policy, whether sharing car can successfully attract capital inflow or still face the dilemma of "cooking without rice"< br />