A few pictures to understand the block chain technology in the end is what? _ Block Chain

The concept of "block chain" can be said to be unusually hot, as if no one at the Internet financial summit to talk about the block chain technology out, bat and the major banks have any financial institutions are starting their own block chain research, even IBM has recently set up its own block chain Research laboratory, but in fact, what is the block chain in the end? It may not be clear to us that we remain in a state of smoke and mirrors. From today onwards, let us go into the block chain, uncover the mystery of the block chain!
  
You want to talk about the chain of blocks?

To be clear about the block chain, let's start with a story.

You must have heard the story of all men say, haven't you?

Suppose a man tells you, bad, there is a tiger on the street, do you believe it?

I go, you do not follow the common sense of the card ah, you have to say do not believe!


We're talking about a real tiger!

Action!!!


Good, very good!! The!!! of the actor-level performance

Go on, this time a bunch of people tell you about it!


Let's change the scene again.

What would you think if a venerable old man with great trust told you about it?


Yes, this is called the Power of trust. You don't trust a single individual who doesn't have enough credit,

But you will trust a bunch of individuals or individual individuals with enough credit.

In the real world, banks are the individuals (centers) with enough credit.


But taking the bank as a credit intermediary is a need of cost,

And we, the general public, will pay for this huge credit cost.

That's why the financial industry is the most lucrative business.



To remove credit endorsements from central institutions such as banking?

Then we can use the "pile of individuals" mentioned above, which is also the core of block chain technology.


The block chain is essentially a technical solution to solve the trust problem and reduce the cost of trust.

The purpose is to go to the center, to the credit intermediary.

The block chain is the underlying technology of the bit currency.

The concept of Bitcoin (BitCoin) was originally proposed by Ben Cong in 2009, and you can interpret it as a digital currency.

We take the bitcoin transaction as an example to see how the block chain is operated.

1, each transaction in the whole network broadcast. To allow full network recognition to be valid, it must be broadcast to each node.


2, the Miners node received the transaction information, must take out the books book this record of the transaction.

Once recorded, it is irrevocable and cannot be destroyed at will.

The miners ' nodes are confirmed by the bit-currency software that runs on the computer.

In order to encourage the miners ' services, for the transactions recorded and confirmed by them,

The system provides the miners with 25 Bitcoin as a reward. (The amount of this award, system set to halve every 4 years)


The reward is only one, then see who record fast chant.

In order to reduce this situation, the system will have a 10-minute operation,

Whoever can work out the value quickly will get the right to record and earn rewards.


Yes, we can show you this. It is said to be the operation of the Xuhui District Kindergarten Primary School.

Don't worry, you try, I was wrong the first time.

..., well, I can't refute it.

It's far, we'll say it again.

The algorithm used in the block chain is not a simple computational problem, but a hash hashing algorithm.


Hash hashes are classic cryptography techniques that can be used to verify that no one has tampered with data content.

3. The miners who get the right to account will broadcast the deal to the whole network, the books are open, and the other miners will check the accounts. The transaction reached 6 confirmed and was successfully recorded.

When the miners record, the deal is also stamped with a timestamp to form a full time chain.

4, when the other miners confirmed the record of the books, the record was confirmed legal, the miners entered the next round of the battle for the right to book.

Each of the miners ' records, a block, is stamped with a timestamp, and each newly generated block is pushed in a strictly chronological order,

Forming an irreversible chain (chain), so called a block chain (blockchain).

And each block contains the hash value of its previous block, ensuring that the blocks are connected in chronological order without being tampered with.



This time we look at the original definition of the block chain can understand: Block chain is a distributed database, is a series of cryptographic methods associated with the production of data blocks, each block contains a network transaction information, used to verify the validity of its information and generate the next block.

If two people upload at the same time, although this probability is very small, but if it happens, we will see the last block chain which is longer, the short one will fail. This is the "double flower problem" in the block chain (the same amount of money is spent two times). If you're going to make a fake deal, your tampering will be ineffective unless you convince more than 51% of the miners in the net to change an account.

The greater the number of participants in the network, the less likely it is to achieve fraud.

This is also the superiority of collective maintenance and supervision, the falsification cost maximization.

It's often hard to convince 51% of people to fake it.

Well, we conclude that the block chain mainly has the following core content:

1, go to the center of the

This is a disruptive feature of the block chain, and there is no central agency or central server, and all transactions occur in client applications installed on each person's computer or mobile phone.

The realization of point-to-point direct interaction, not only saves resources, makes the transaction autonomous, simple, and excludes the risk of being centralized agent control.

2. Openness

Block chain can be understood as a public bookkeeping technology scheme, the system is completely open and transparent, the books are open to all people, to achieve data sharing, anyone can audit. The open effect looks like this:

3, irrevocable, tamper-proofing and encryption security

The block chain takes a one-way hash algorithm, each new generation of blocks in strict accordance with the time line, the irreversibility of time, irreversible cause any attempt to invade the chain of data information in the link is easy to be traced back, resulting in the exclusion of other nodes, the cost of fraud is very high, thus can limit the related wrongful acts.

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