I don't understand why people think it's a bit difficult to understand the blockchain, and I want to know why I don't. That was in 2013, the first time I heard about Bitcoin (yes, it’s too late). I am so poor that I can't afford to buy one. You may have no love for this article. Later, I wanted to find out the underlying technology that it relied on, also the blockchain. However, because it is too busy, it has not started yet (then there is no beginning and no start).
So what exactly is this “blockchain�
In fact, there are two things: one is the block and the other is the chain. To say that the mystery is a block of a chain. Because it is something that exists in the computer, we can determine that one of its physical forms is awkward, that is, the digital information is divided into blocks and then linked. For example, the boxes in the figure below, each representing a country, and each contains the name of the city of the corresponding country.
Wait, there are actually more things coming. Every square here has something called a hash. A hash is a string of characters (such as "1hi515AHA5H"). The hash is based on the information contained in the box. USA's cubes have New York, Los Angeles, and Chicago cities, so its hash is something like "NYLAC" (technically far from it, but you will be fine).
Each successive square will contain the hash of the previous square, so this is the (mandatory) tie that binds them together. If someone tampers with the first box and joins the city Boston, the new hash will be "NYLACB", but the hash of the subsequent India box is still "NYLAC", this mismatch Will interrupt the chain. So the purpose of the hash is to ensure that no one can tamper with the block.
So what if someone modified the contents of a box and then updated the hash of the subsequent splicing block? This is also possible, but there is one thing I have not told you. Blockchain data doesn't just exist in just one computer. The blockchain data in a computer cannot be deceived because it will be copied to every user's computer on the network. If you join a blockchain network, your computer will download the block data. If someone tampers with the version he owns, the entire network will also consider the version owned by the majority of the person's computer. correct.
One more thing, in a blockchain network, not only data, but the entire system's programs are copied to all computers. Most Internet applications are focused, such as Facebook, where her data and programs are placed on her server, and your computer gets information from a Facebook server that you need to know. But in the world of blockchain, there is no thing that exists in the center. It depends on the user's computer to accommodate its own programs. Yes, this means that if every computer in the entire blockchain network is shut down, then the blockchain system will die.
Common blockchain
Does this mean that the blockchain system is actually made up of a group of people who are willing to keep their computers running in good faith? And what are these tamper-resistant blocks used for?
The power of the blockchain network is endless. Bitcoin is a data currency and a payment system. All of the tamper-resistant blocks stored in it are the ledgers of all transactions. Those who contribute their own computers are called miners. The system will give them Bitcoin as a reward.
Ethereum has an intentional additional feature. It can carry your code and develop a blockchain system from scratch, and it can be very difficult to build a system of your own (remember that someone has sacrificed their computer's ability to run for you) . Ethereum maintains these powerful computing powers, and you need to pay for these calculations.
Blockchain applications are not necessarily payment systems or cryptocurrencies. It can be anything like a social network, a learning platform like LiveEdu, and more.
Private blockchain
Bitcoin, Ethereum, etc. are examples of public blockchains that anyone can be a part of. So what if we want to have a private blockchain network? Some people want a private blockchain. What do you want to do? Then come and tell the story below.
Mark and Sara
Mark hasn't paid the rent for five months. When Sara asks for him, he says he will give her later. She can't afford a lawyer's fee, and it takes eight months or even a year for the court to enforce the lawsuit, so the only option is to convince Mark.
Joe's business
Joe is a businessman who often has to do business with different companies. A few months ago he signed a contract with a retailer, and although the terms of the contract had been fulfilled, the retailer refused to pay. This group of people used the loopholes in the legal system to lobby Joe, in order to achieve the goal of paying less. Joe used to have experience in this area. In some cases, he would seek help from the court, but the time and money spent doing so would lose his own profits.
How can we help Sara and Joe?
Can we solve this problem elsewhere? In the case of Sara, we need to let Mark pay the rent on a monthly basis, which is actually a time-based trigger mechanism. Your calendar program uses such triggers to give you notifications of preset events.
In the scene that Joe encountered, once the terms of the contract were met, the parties had to pay, which is actually a condition-based trigger mechanism. When you think about buying an e-book from Amazon last time, do you have to confirm the payment first, will Amazon send the e-book to you?
The point is that the computer program will consistently execute instructions such as this. When you click on this article, scroll down, and so on, it will follow the instructions. In order to help Sara, we need to convert the terms of the contract into code.
Pseudo code for smart contracts between Sara and Mark
If today's date is 30th and rent is not paid then
Transfer $500 from Mark's account to Sara's account
But where do we deploy this code? It should be deployed to all participants' computers. Sara's and Mark's bank are all part of this private blockchain network. Joe and Sara will sign a coded agreement (that is, a smart contract), which will then be distributed to the network, and both Mark and Sara's bank will have a copy. On the 30th of each month, when the clock beats to 12 o'clock, the agreed amount will be transferred from Mark's account to Sara's account. Joe also began using smart contracts to force his clients to pay for the agreement.
Sara is happy because she no longer has to worry about Mark. Will she pay the rent as much as she can. Joe is also happy because he doesn't have to find a court to talk about it. Save these energy and he can continue to develop his own business.
The private blockchain is limited to the parties involved in the business, so Joe will not be part of the blockchain network to which Sara and Mark belong.
The way forward
Now that you have a little idea about this, maybe you should try the course on edX (free of charge), which will teach you how to build an application on the blockchain.
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