Blockchain lbank
From the perspective of technology and architecture, I will tell you my understanding of blockchain in common language
what is blockchain? In a word, blockchain is a storage system. To be more specific, blockchain is a distributed storage system without an administrator and each node has all the data
What are the common storage systems like
first, how to ensure high availability
the common storage system usually uses "rendancy" to solve the problem of high availability. As shown in the figure above, if the data can be copied into several copies and rendant to multiple places, high availability can be guaranteed. The data in one place is hung, and there is data in other places. For example, the master-slave cluster of MySQL is the same principle, and the raid of disk is also the same principle
two points need to be emphasized in this place are: data rendancy often leads to consistency problems
1. For example, in the master-slave cluster of MySQL, there is actually a delay in reading and writing, which means there is a inconsistency in reading and writing in a short period of time. This is a side effect of data rendancy
The second point is that data rendancy often reces the efficiency of writing, because data synchronization also consumes resources. If you add two slave libraries, the write efficiency will be affected. The common storage system is to use rendancy to ensure the high availability of dataso the second question, ordinary storage system, can write more
the answer is yes, for example, take this graph as an example:
in fact, MySQL can do a master-slave synchronization of al masters, master-slave synchronization of al masters, two nodes can be written at the same time. If you want to do a multi room multi live data center, in fact, multi room multi live data synchronization. What we should emphasize here is that multi-point writing often leads to the consistency problem of writing conflicts. Take MySQL as an example, suppose that the attribute of a table is self incrementing ID, then the data in the database is 1234 now. If one of the nodes writes and inserts a piece of data, it may become 5, and then these 5 pieces of data are synchronized to another master node, Before synchronization, if another write node inserts a piece of data, a piece of data with self incrementing ID of 5 will be generated. Then, after the generation, synchronize to another node, and the synchronized data will conflict with the two local 5's after it arrives, which will lead to synchronization failure and write consistency conflict. This problem will occur in the case of multi-point writing
how to ensure consistency in multi-point writing
the reform "Swan class" gives you more technical work
With the announcement of the state accelerating the development of blockchain technology, various digital wallets and digital currency fraudsters using blockchain technology in the market have changed, which is known as the direction of state support in fact, this is e to some wrong elements
this kind of wallet is called digital wallet in the market, which allows wallet operators to buy ICO coins from abroad, so that operators can guess coins and increase the value of money. In short, it's the same as "postcards.". The only difference is that the object name is replaced by "blockchain cryptocoin". As long as everyone puts money in my wallet, everything is normal. You can say that you can deposit 100 today and 1000 tomorrow
after registering the main body of the foundation, we still need to do later legal compliance, the main purpose is to draw a clear line between law and crime, but I said it doesn't count. Because digital token is indispensable for blockchain. To put it bluntly, digital currency drives the popularization of blockchain in China, but what's the fact? Digital currency is just a small application of blockchain technology
e to the particularity of the instry, At present, there are no formal laws and regulations to restrict its development, involving a wide range of violations:
pyramid selling
illegal fund-raising
money laundering
absorbing public deposits
illegal operation
transnational foreign exchange crimes
providing more convenience for terrorist financing
therefore, different countries in the world have different attitudes towards blockchain, and China is explicitly prohibited, So we all go overseas to develop projects, such as Singapore and Thailand. First, the local laws and regulations are required. Who has the final say in the matter of whether the project is legal? There are two ways: to apply for a formal digital transaction license or to rely on a legal opinion issued by a lawyer. At present, the latter is in the majority, easy to operate and low cost.
if 50 points = 50W, then 1 point = 1.48, 50 points = 4.4: the larger the purchase points, the more 1 point card = mhblt.6w
if 50 points = 35W, then 1 point = 0
give you a range. 7W
if 50 points = 40W, then 1 point = 0:1 hour = 38 cents, Netease point card discount 9.0w
if 50 points = 55W, then 1 point = 1, is close to 38 cents an hour.79, give the most satisfied< If 50 points = 25W, then 1 point = 0.2W
note: if 50 points = 60W, then 1 point = 1:
if 50 points = 20W, then 1 point = 0 The free time of buying some cards is not included
, you can't say that 100 points is probably not 100W; 4) If 50 points = 45W, then 1 point = 0, 47.1w
if 50 points = 60W, then 1 point = 1 It depends on the percentage of points in your district 5 W
if 50 points = 30 W, then 1 point = 0.74 yuan, which is the same area in popular terms
if 50 points = 50 W! Hope
it should be noted that this is the recharge price. If it's selling q-coin, because q-coin recycling is now done by some third-party platforms, there will be a certain cost. Therefore, the recovery price of Q coin is generally lower than the recharge price, remember!
Father: Li Yuanhao, Xia Jingzong
Mother: Empress Xuanmu Huiwen (the empress who didn't hide) no Zang surname: no Zang e Pang's younger sister. The empress of Wuzang: the daughter of Wuzang e Pang, who was abandoned and killed
empress Liang: Han nationality, after Li Liang pretended to be dead, she held the power of Xixia as empress dowager for 18 years, and was posthumously named "empress Gongsu Zhangxian". His son Xia Huizong, Li bingchang: Empress of mother Liang. Daughter Li, princess, Queen of mother Liang, title to be tested. In the fifth year of Xining in the Northern Song Dynasty and the third year of national day in Xixia (1072), Empress Dowager Liang invited her daughter to marry Lin Bi, the son of Dong felt, the leader of Xifan