Blockchain is a chain composed of small blocks recording various information ,
It's like we stack bricks , And it can't be removed after folding , Each brick also has various information written on it ,
include ： Who folded it , When did you fold it , What materials are used for bricks, etc , You can't change this information .
From the computer ：
Blockchain is a special distributed database .
Distributed database is to put data information on each computer separately , And the stored information is consistent ,
If one or two computers break down , Information will not be lost , You can also view it on other computers .
Blockchain is a distributed , So it has no center point , The information is stored in all nodes that join the blockchain network ,
The data of the node is synchronized .
A node can be a server , Notebook computer , Mobile phones, etc .
As like as two peas, you can see that the data stored in these nodes are exactly the same .
<> Blockchain characteristics
** Decentralization ：** Because it is distributed storage , So there is no central point , It can also be said that each node is the center point ,
Applications in life just don't need a third-party system （ bank , Alipay , Real estate agents belong to third parties ）.
** Openness ：** The system data of blockchain is open and transparent , Everyone can participate ,
Like renting a house , You can know the previous rental information of this house , Have you ever had a problem , Of course, some personal private information here is encrypted .
** Autonomy ：** Blockchain adopts consensus based specifications and protocols （ For example, a set of open and transparent algorithms ）,
Then each node operates according to this specification , This means that everything is done by machines , There is no human element .
Make right " people " Trust in machines has been changed to trust in machines , Any human intervention will not work .
** Information cannot be tampered with ：** If the information is stored in the blockchain, it is permanently saved , There is no way to change , as for 51% attack , Almost impossible .
** Anonymity ：** There is no personal information on the blockchain , Because these are encrypted ,
Is a string of numbers and letters , In this way, your various ID information will not appear , The phenomenon of telephone numbers being reselled .