When it comes to blockchain, I like to use code to explain the blockchain and the connection between it and your current development knowledge. Although many people are talking about blockchain now, for some reason, few people seem to really understand the role of this technology in our existing development tool set.
Political views aside, the blockchain is just a data layer of our application. In the future, it may be the only persistence layer, of course, it is not necessary to do so, you can also use multiple data layers of this type in the application. Here I recommend a lecture to you. It mainly introduces what we should focus on when developing and creating interconnected blockchains, and explains the necessity of doing so.
In our existing application, we use api to store information in one or more databases. Blockchain projects do the same, you can interact with APIs (client or server) to store data in the blockchain.
Similarly, our database also has corresponding models to structure data, such as tables, document models, you can name them, they are all used to describe the shape of the data. Blockchains do not usually have to comply with this convention. They are more like noSql databases. You can store data without caring about the format of the data. But software development experience tells us that using non-hierarchical data is not necessarily a good idea. This is why we ended up using Mongoose as a tool for MongoDB, which can delay data modeling. Therefore, using tools such as Convector in blockchain projects can make writing models to shape data very simple and intuitive.
Another advantage over databases (probably the most important advantage) is stored procedures. A stored procedure is a logic (function) that exists in the database itself, and it receives input of data to perform operations. In blockchain development, this is usually called a smart contract or chain code. Knowing how to write these functions and the related matters that need to be considered is what we call blockchain development. Of course, it should not be confused with blockchain core development. The latter refers to the development of blockchain technology itself, or a database engine.
Another reference for software developers that is better understood is the control version system, such as GIT. Every change you make to the data is versioned, and you can go back to check these changes at any time. Note: You can even change the historical value of the blockchain! Just like you did a rebase in GIT to merge commit or update messages. But in the two environments of GIT and blockchain, you will eventually get the hash value of the changed commit and all subsequent commits. You will get a completely different history, and no one will accept any changes from you because you have deviated from the master branch (the public blockchain version). In the blockchain, there is no force to overwrite historical records.
Blockchain is decentralized, and the execution of smart contracts must occur multiple times on different computers. This is part of the distributed computing concept that blockchain developers must consider when using blockchain as a data layer.
In smart contract execution, you can think of it as an update hook in GIT, executed by the node containing a copy of the blockchain, and then receiving the commit you are trying to execute. This hook contains the logic to determine whether the submitting author has the permission to update the repository. You can also rely on the identity verification of the submitting author, so that verification can only rely on the submitter himself.
Since your hook will be executed at all peers, your operation must be deterministic, so functional programming is required here. You should not rely on the global state (the file system is a global state) or rely on external sources of information (such as a connection to an API or any network access) to generate random numbers.
For software developers, blockchain is not a rare technology. Its core function is built on the technology we have decades ago. Just like cryptography, GIT itself also follows most of today’s The core concept followed by the blockchain.
I hope this article can help you understand this technology without having to delve into the very complicated terms that bothers you.
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