Blockchain Applications: Great Inventions That Can Record History

Many great inventions in human history seem to be extremely simple, but their impact is extremely far-reaching.
    Movable-type printing, just replacing the full-page engraving with the arrangement of movable type, greatly improves the printing efficiency, making books less expensive, thus breaking the church's monopoly on knowledge and triggering the religious reform; double-entry bookkeeping, It's just that on the basis of the running account, each asset is listed as a separate account, and the two confirm each other, so that businessmen can systematically understand their business, thereby expanding the scale of business and becoming a catalyst for capitalism; tanks are nothing more than "tractors installed on Artillery or machine gun”, it has rewritten the history of war; a container is just a loadable box, it has rewritten the history of shipping; the Internet is just a bunch of computers connected by a network cable, and it has refreshed all industries.
      Blockchain application is also such a simple and great invention.
Different ledgers
First of all, the blockchain application is a ledger, there is nothing to say, the ledger can be seen everywhere. The difference is that this ledger is stored on thousands of computers around the world, and the ledger records of each computer are consistent and updated synchronously. Maybe you think it's nothing special, but you think it's a waste of resources to keep so many copies in one ledger. Or maybe you're a programmer, and you'll be dismissive: Oh, it's just a distributed database, what's so strange!
Yes, a blockchain application is a distributed database, and it's a "wasting" of resources, but it's really great because this difference can cause a huge butterfly effect.
The biggest difference between blockchain applications and ordinary distributed databases is that the latter only exists on multiple computers in a company or organization. No matter how "distributed" it is, it still has a unified owner and management. is still centralized. But each node of the blockchain can belong to different people, and the nodes can be unfamiliar and mutually distrustful. Any computer can join or leave the network freely. The entire blockchain application network is composed of these loose consists of nodes with no center and no boundaries. Blockchain does not depend on a single organization, but on the entire Internet.   
This difference can lead to completely different characteristics.
Historical records cannot be tampered with
In an ordinary distributed database, its owner has the power to live and kill the data recorded in it. This is very efficient, but for users of this database, it is very insecure. But for blockchain applications, because there is no unified owner, each record above requires the consent of all nodes to be recorded. Once recorded, if you want to change it, all nodes need to agree to change it. Inefficient, but highly credible. Because the blockchain is attached to the entire Internet, no one can control the entire Internet, so no one can control the blockchain ledger.  
This means that unfamiliar nodes that do not trust each other can use blockchain technology to build a unified ledger that cannot be tampered with and is highly credible. Or in the words of The Economist, a blockchain is a trust-making machine. Now, don't you think it's a little bit arrogant? Is it acceptable for that little "waste"? If you're a libertarian, maybe cheer up because the blockchain creates something that's not controlled by the government.
Verifiable data
What does an immutable ledger mean for the Internet?
The answer is data validation.
The emergence of the Internet has solved the problem of data transmission, and data can be transmitted from one end of the earth to the other at low cost. But it also brings another problem, that is, the ownership of the data cannot be determined. Because data can be easily copied and pasted, and the Internet does not fully document the process of copying, pasting and dissemination, it is difficult to determine who a piece of data belongs to. We have now entered the era of big data. Data is the oil of this era. If the data cannot be confirmed, it is equivalent to the fact that the oil cannot be confirmed. It is conceivable how serious this problem is.
The emergence of blockchain applications perfectly solves this problem. On the blockchain application ledger, the flow of each data is clearly recorded, so that it is clear at a glance who these data belong to.