How to implement digital currency transfer in golang

In recent years, blockchain technology has been paid attention to and used by more and more people. Among them, the application of digital currency is also becoming more and more widespread. One of the core technologies of blockchain, smart contracts, has become the key to realizing transfers between digital currencies. This article will introduce how to implement digital currency transfer using Golang language.

1. Golang language

Golang, referred to as Go, is an open source programming language launched by Google. It provides simple and easy-to-use programming syntax, supports multi-threading, has strong security, and is easy to expand. Therefore, Golang language is widely used in cloud computing, data storage, network communications, API development and other fields.

2. Smart Contract for Digital Currency Transfer

Smart contract is a special program code that can be stored on the blockchain and used to implement trusted transaction logic. Digital currency transfer is one of the typical cases. The core idea is to store currency transaction information in smart contracts during the transfer process, and use blockchain technology to record the process of each transaction. After each transfer is completed, the correct transaction of currency can be achieved through the recorded information of the smart contract.

3. The process of realizing digital currency transfer in Golang

1. Creating an account

In Golang, we can use struct to create an account and record it The account's private and public keys. The private key is the key information used for account signature, while the public key is used for account verification and transaction record access.

type account struct {
    privateKey string
    publicKey  string
}

2. Create Transaction

Transaction refers to the transfer process of digital currency. In Golang, we can use struct to create a transaction and record the sender, receiver, quantity, timestamp and other information of the transaction.

type transaction struct {
    sender   string
    receiver string
    amount   float32
    time     int64
}

3. Generate transaction signature

Transaction signature is the signature information generated using the private key during the transaction process to ensure the security of the transaction. In Golang, we can use the RSA algorithm in the crypto library to generate transaction signatures.

func generateSignature(privateKey string, data []byte) ([]byte, error) {
    key, err := parseRSAPrivateKeyFromPEM(privateKey)
    if err != nil {
        return nil, err
    }
    h := crypto.SHA256.New()
    h.Write(data)
    hashed := h.Sum(nil)
    signature, err := rsa.SignPKCS1v15(rand.Reader, key, crypto.SHA256, hashed)
    if err != nil {
        return nil, err
    }
    return signature, nil
}

4. Send transaction

In Golang, we can use the http library to construct a request to send a transaction and send it using RPC. Specifically, Golang will call the blockchain node through RPC to verify and record transactions.

func sendTransaction(tx *transaction, privateKey string, endpoint string) error {
    data, _ := json.Marshal(tx)
    signature, err := generateSignature(privateKey, data)
    if err != nil {
        return err
    }
    signedTx := base64.StdEncoding.EncodeToString(signature) + "." + base64.StdEncoding.EncodeToString(data)
    body := strings.NewReader(signedTx)
    req, _ := http.NewRequest("POST", endpoint, body)
    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        return err
    }
    defer resp.Body.Close()
    return nil
}

4. Summary

Golang is a programming language that is very suitable for blockchain application development. It is easy to use, efficient, secure, and scalable, making digital Smart contract implementation for currency transfers just got easier. This will contribute to the wider application and development of blockchain technology.

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