Full text of blockchain 94

2. Blockchain is a technology, and the underlying technology of bitcoin is blockchain. Blockchain features: decentralization, anonymity, security, transparency, traceability, irreversibility, etc
according to the development of blockchain, it can be divided into three stages:
blockchain 1.0 stage: when the digital currency represented by bitcoin first appeared, it was probably from 2008 to 2014
blockchain 2.0 stage: from the birth of Ethereum to the eve of "94 event" in 2017, this is the development era of smart contract and blockchain
blockchain stage 3.0: after the "94 event", we began to pay attention to the exploration and development of blockchain applications and reshape the technology and value of blockchain

although blockchain technology has been widely recognized, people still cannot do without digital currency. After all, the underlying technology of digital currency is blockchain. Even though the non currency blockchain on the alliance chain can be advocated by mainstream regulators, it is much more difficult than the real decentralized blockchain such as public chain projects. What technology geeks pursue are often more difficult decentralized projects

therefore, digital currency will not be destroyed, which is the development trend. As for how you say to play, maybe you are asking how to play digital currency instead of blockchain? If you really want to deepen the understanding, you may as well go to Citex (big C network) to have a look, hope to adopt, thank you.

3. The general classification of Chongqing jinwowo analysis blockchain technology is as follows:
1 - Open blockchain
2 - Collaborative blockchain
3 - private blockchain.

4. Blockchain 94 refers to that on September 4, 2017, the central bank, together with seven ministries and commissions, stopped the ICO event in the blockchain and defined ICO as illegal fund-raising. At the beginning, fire coin, coin an, Bitai, OK, Bitai and so on moved abroad

5. IOS Gift Pack:

mu77 novice Gift Pack: 202sbpabw

6. The formal expression of Byzantine general problem (hereinafter referred to as "consensus problem") is: how to reach a consensus on information in a distributed network that is not based on trust? This statement sounds obscure, but its essence is not complicated. Although the following examples are not completely consistent with the consensus issue, they are helpful for our understanding [9]

imagine that in Byzantine times, there was a rich city-state with all kinds of gold, silver, jewelry, silk and satin, and its Lord Doraemon enjoyed all the luxury and glory. On the outskirts of the city-state, four Byzantine Generals, Daxiong, panghu, Xiaofu and Jingxiang, coveted Doraemon's wealth, so they decided to join hands to capture Doraemon's city-state. According to the strength comparison between the two sides, more than half of the generals must attack at the same time to defeat the enemy, so the winning condition is that at least three of the four can agree on the attack time. What are the odds of the four generals

the answer to this question depends on the cooperation mode of the four people. If it is a centralized system and there is an alliance leader, such as panghu (equivalent to a central server), then there is no doubt about their victory, because it is very easy to reach an agreement on the attack time. As long as panghu calls Daxiong, Xiaofu and Jingxiang to have a meeting to discuss it, Even if we have different opinions, panghu can make a final decision. Now let's go back to the assumption of Byzantine Generals. In a distributed network without trust, what are the odds of four generals winning< br />
?

first of all, e to the lack of trust between the four generals, the possibility of gathering in a small dark room for a conspiracy meeting is ruled out (what if they are kidnapped by panghu in a small dark room?); Secondly, since there is no leader, the opinions of all four people will be equally valued. In this case, the four generals could only negotiate the attack time by sending messages between their camps by messenger. For example, if Daxiong thinks 6 a.m. is a good time to launch an attack, he will send messengers to tell panghu, Xiaofu and Jingxiang their opinions. At the same time, panghu may think it's better to launch a surprise attack at 9 p.m., Xiaofu prefers to launch an attack at 3 p.m., and Jingxiang hopes that it will be 10 a.m., and the three of them will send their own messengers at the same time. In this way, after the first round of communication, each of the four generals had four attack times to choose from, and each of them had to inform the other three of their chosen time in the next round of communication. Because four people make decisions independently, there are 256 possible final choices. Only when more than three people choose the same time can consensus be reached, and there are only 64 such results, that is to say, the probability of reaching consensus is only 1 / 4. This is only the case of four generals. What if the number of generals is 10, 100 or 1000? With a little calculation, we can see that as the number of people increases, the hope of reaching a consensus will become increasingly dim

change the general in the above example into the node in the computer network, the messenger into the communication between nodes, and the attack time into the information that needs to reach a consensus. Then you can understand the dilemma described by the consensus problem. The ability to reach a consensus is self-evident for a payment system. If you remit a sum of money to your family to buy a car and go to the bank the next day for verification, the counter will tell you "about how much money you remit, there are three versions of records in our system". Obviously, you dare not deposit money in such a bank. Before the emergence of bitcoin, the consensus problem is difficult to be solved perfectly. In order to reach a consensus, we need to adopt a centralized system (unless the nodes meet certain conditions), and in order to decentralize the consensus, we can't guarantee it. So how does blockchain technology solve this problem Pay attention to the official account weoption, reply to "block chain", you can view the full text.