Blockchain time

1. The time limit for developing a blockchain application app, such as starting technology, is estimated according to the functionality of the app. Generally, the development time is about 2-3 months, and the specific time is estimated according to the needs of customers, mainly the development time. If the functions are multiple and more complex, there will be more things to develop and design, and the time will be longer. For example, in another case, the existing source code can meet the requirements, and only need to add or modify some functions will be very fast.

2. It mainly depends on the personal foundation. It's less than three months fast.

3. If it refers to the first block g up, on January 3, 2009, Nakamoto Cong g up the first block on a small server in Helsinki, the Netherlands, which is the so-called "Genesis block". For information about blockchain, you can learn more about it in mimacaijing.

4. The most important thing of blockchain is to solve the problem of intermediary credit. In the past, it was difficult for two people who didn't know and trust each other to reach cooperation, and they had to rely on a third party. For example, in the past, there must be a bank or an institution such as Alipay. However, through the blockchain technology, bitcoin is the first time for human beings to complete the transfer behavior that can be trusted by both parties without the participation of any intermediary. This is a major breakthrough in blockchain
Yao Yudong, director of the Financial Research Institute of the people's Bank of China, once bluntly said: "he was born on the Internet and died on the blockchain." In order to warn those traditional financial institutions and Internet giants who are not sensitive to blockchain technology.

5. digital currency will not be stolen in general. If you use a regular wallet and invest in a regular digital currency, there will be no problem!

6. In order to prevent the double spending problem, the system will automatically time stamp the transaction information of each block and mark it with time brand. How much money you spend at this time is spent. It has been recorded and can't be used to buy other things
how to record it? In fact, the time stamp and other transaction information on the block are calculated to obtain an encrypted value, which is called "hash value". Each new block contains the hash value of the previous block, thus forming a blockchain
so we say: bitcoin system is actually a layer by layer nested, never-ending, very powerful timestamp system, which uses timestamps to ensure that each block is linked into a "chain" (that is, block chain) in chronological order
from this point of view, time stamp literally means to time stamp a block. Its practical function is to provide an important parameter for later hash value calculation, which is an essential and very important information in the process of calculation and verification
finally, we summarize the content of this section. This section mainly introces two terms: utxo and timestamp. These two concepts are important means to solve the "double flower problem", which can ensure that bitcoin can not be used many times without a third party organization.

7. A timestamp, usually a sequence of characters, uniquely identifies the time of a moment. Digital time stamp technology is a variant of digital signature technology
time stamp refers to the total number of seconds from 00:00:00 GMT on January 1, 1970 (Beijing time: 08:00:00 GMT on January 1, 1970) to now
to put it simply, a time stamp in a blockchain means that whatever happens at a certain time will be recorded on the blockchain. For example, the blockchain content publishing platform decent, when someone publishes some information on it, the information will be recorded from the moment of release, which can't be changed. The time of occurrence is fixed and can't be changed.

8.

Vpay, full name is visual payments, Chinese means virtual payment. It was first established in the United States as a platform for digital currency trading, such as bitcoin, quark coin, Leyte coin, etc

vpay is a payment platform for the circulation of digital currency, which was created by Mark & Chen 9642, a former technology executive of Google; Created by Milo. Vpay is a platform without borders, digital trading platform, international shopping mall platform, like Alipay and WeChat. The difference is that Vpay is developed by the most popular block chain technology in the financial circle since 2017. It can achieve cross border transfer without any spot, and there is no fee. p>

extended data

digital currency is short for digiccy, which is the abbreviation of "digital currency" in English, and is the alternative currency in the form of electronic currency. Both digital gold coin and cryptocurrency belong to digiccy

digital currency is an unregulated and digital currency, which is usually issued and managed by developers and accepted and used by members of a specific virtual community. The European Banking authority defines virtual currency as a digital representation of value, which is not issued by the central bank or authorities, nor linked with legal currency. However, because it is accepted by the public, it can be used as a means of payment, or it can be transferred, stored or traded in electronic form

9. All day trading... The website has no rest

10. How many weeks is the go full stack + blockchain course? How many stages? How long does each stage last? What is the degree of completion of each stage<
22 weeks in total, divided into five stages,
the first stage is four weeks, go language foundation and network concurrency, after learning the introctory go language,
the second stage is four weeks, go language practical web development, crawler development, cryptography, consensus algorithm, implementation of lightweight public chain, after learning the website and crawler that can develop golang, Achieve lightweight blockchain
stage 3, 4-week Ethereum source code analysis and smart contract DAPP development, master Ethereum core and smart contract development, as well as blockchain,
stage 4, 4-week super ledger, bitcoin EOS, source code analysis and smart contract practice, master super ledger development, cat bitcoin, bifurcated EOS after learning, And the intelligent contract DAPP development
phase V 6-week project actual combat, 5 enterprise level projects, after learning, you can have 1 year of blockchain project experience