Getting Started Guide to Blockchain Development (Go Language Edition)

Blockchain Development Getting Started Guide (Go Language Version)

With the continuous evolution of technology, blockchain technology has increasingly become one of the hot topics in the Internet field. As a decentralized digital ledger, blockchain has gradually been widely used in finance, medical care, logistics and other fields. As an efficient programming language, Go language is gradually becoming popular in blockchain development. This article will introduce readers to the basic knowledge of blockchain development and the steps to use Go language for blockchain development.

1. Basic knowledge of blockchain

1. Characteristics of blockchain

Blockchain is a decentralized digital ledger with the following features: Features:

(1) Non-tamperability: Once the data is written to the blockchain, it cannot be tampered with.

(2) Decentralization: The blockchain is distributed and has no centralized agency or institutional control.

(3) Anonymity: In the blockchain, data is anonymous, and only the account address and public key are public.

2. Application of Blockchain Technology

Blockchain technology has been widely used due to its security, efficiency, anonymity and other characteristics, including the following aspects :

(1) Cryptocurrency transactions: Behind digital currencies such as Bitcoin and Ethereum are transactions using blockchain technology.

(2) Digital securities: Through blockchain technology, the trading of digital securities such as stocks and bonds can be realized.

(3) Supply chain management: The use of blockchain technology can realize the tracking and management of the supply chain and improve the transparency and efficiency of the supply chain.

(4) Digital identity authentication: Blockchain technology can realize the distribution and verification of digital identities and enhance digital security.

2. Steps to use Go language for blockchain development

1. Install Go language environment

First, you need to install Go language in the development environment environment. After the installation is complete, you can use command line tools to run Go programs.

2. Establishing the blockchain data structure

When using Go language for blockchain development, the data structure of the blockchain needs to be defined. A blockchain is usually composed of multiple blocks, and each block contains the hash value, transaction information and other data of the previous block.

In the Go language, you can define a structure to represent a block and use an array to store multiple blocks:

type Block struct {
    Index     int
    Timestamp string
    BPM       int
    Hash      string
    PrevHash  string
}

In this structure, Index indicates that the block is in the area Position in the block chain; Timestamp represents the timestamp of the block; BPM represents the data information contained in the block; Hash represents the hash value of the current block; PrevHash represents the hash value of the previous block.

3. Calculate the hash value of the block

Each block in the blockchain has a hash value that represents the uniqueness of the current block and immutability. When using Go language for blockchain development, you can use the SHA-256 algorithm to calculate the hash value of the block.

func (b *Block) calculateHash() string {
    record := strconv.Itoa(b.Index) + b.Timestamp + strconv.Itoa(b.BPM) + b.PrevHash
    h := sha256.New()
    h.Write([]byte(record))
    hashed := h.Sum(nil)
    return hex.EncodeToString(hashed)
}

In this method, we first spell the data information in the block into a string, then use the SHA-256 algorithm to perform hash calculations and return the hash value.

4. Add a new block

When you need to add a new block to the blockchain, you need to first calculate the hash value of the block, and then add The current block is connected to the hash of the previous block. When using Go language for blockchain development, it can be implemented as follows:

func generateBlock(oldBlock Block, BPM int) (Block, error) {

    var newBlock Block

    t := time.Now()

    newBlock.Index = oldBlock.Index + 1
    newBlock.Timestamp = t.String()
    newBlock.BPM = BPM
    newBlock.PrevHash = oldBlock.Hash
    newBlock.Hash = newBlock.calculateHash()

    return newBlock, nil
}

In this method, we first obtain the current timestamp, and then generate a new block based on the information of the old block. The process of generating a new block involves calculating the hash of the block and concatenating the new block to the hash of the old block.

3. Summary

It can be seen that Go language is a very suitable language for blockchain development. When using Go language for blockchain development, you need to first understand the basic concepts and application scenarios of blockchain, and on this basis, establish the data structure of the blockchain, and define the hash value calculation method of the block and the new block Add method. Through the above steps, you can complete the development of a simple blockchain application.

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