Blockchain Wallet Development Guide in PHP

Blockchain technology has attracted much attention in recent years. Its underlying technology can be applied to many fields, and wallets are one of them. This article will use PHP language to introduce how to develop a blockchain wallet.

1. Understand the blockchain wallet

First of all, we need to understand the concept of blockchain wallet. A wallet is a native client for a digital currency that allows you to check balances, send and receive transactions, similar to a traditional bank card. Blockchain wallet refers to a wallet realized through blockchain technology, which is characterized by decentralization, anonymity, safety and reliability, etc.

2. Create a new wallet

To create a new blockchain wallet in PHP, you need to use the following steps:

1. Generate a public and private key pair

In PHP, you can use the openssl library to generate an RSA key pair. The specific method is as follows:

$rsaKey = openssl_pkey_new();

$keyData = openssl_pkey_export($rsaKey , $privKey);

$pubKey = openssl_pkey_get_details($rsaKey);

$pubKey = $pubKey["key"];

2. Convert public and private key formats

The format of the public and private keys generated by the conversion is Base58 encoding (the encoding method commonly used in Bitcoin wallets). You can use the Base58 encoding method in the BitWasp library. The specific code is as follows:

$privEncoded = Base58: :encode($privKey);

$pubEncoded = Base58::encode($pubKey);

3. Generate wallet address

The wallet address can be generated through the private key. Use SHA256 and RIPEMD160 algorithm hash generation, the specific code is as follows:

$privHash = hash("sha256", $privEncoded);

$addressHash = hash("ripemd160", $privHash) ;

$addressEncoded = Base58Check::encode($addressHash);

At this point, we have created a new blockchain wallet.

3. Transaction process

1. Query the balance

Querying the balance requires interaction with the blockchain network. You can send data to query the balance by accessing the node API. Commonly used node APIs include blockchain.info, BitPay, Coinbase, etc. In PHP, you can use the cURL library to implement HTTP requests. The specific code is as follows:

$url = "https://api.blockcypher.com/v1/btc/main/addrs/$address/balance";

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $url);

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($curl);

curl_close($curl);

$balanceJSON = json_decode($response);

$balance = $balanceJSON- >balance;

2. Send transaction

Sending a transaction requires constructing transaction data, including sending address, receiving address, transaction amount, handling fee and other information. In PHP, the BitWasp library can be used to construct transaction data. The specific code is as follows:

$txBuilder = new TransactionBuilder();

$txBuilder->spendOutPoints($utxo);

$txBuilder->payToAddress($destAmt, AddressFactory::fromString($toAddress));

$txBuilder->fee($feeAmt);

$txBuilder-> ;signInput(0, $keyPair);

$txhex = $txBuilder->get()->getHex();

3. Query transaction records

Querying transaction records also needs to be queried through the node API, which is similar to the first step of querying the balance. The specific code is as follows:

$url = "https://api.blockcypher.com/v1/btc/main/addrs /$address";

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $url);

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true) ;

$response = curl_exec($curl);

curl_close($curl);

$txJSON = json_decode($response);

$ txs = $txJSON->txrefs;

4. Add multi-signature

Multisig refers to a mechanism that requires two or more signatures to verify the validity of a transaction. In PHP, you can use the BitWasp library to build multi-signatures. The specific code is as follows:

$publicKeys = [

PublicKeyFactory::fromHex($publicKey1),

PublicKeyFactory::fromHex($publicKey2),

];

$multiSig = new Multisig($publicKeys, 2);

So far, we have learned how to create and trade a blockchain wallet through PHP.

4. Security Precautions

1. Private key protection

The private key is the core of the blockchain wallet. If it is leaked, the wallet will be stolen. Therefore, the following measures should be taken to protect private keys: offline storage, encrypted storage, decentralized storage, regular backup, etc.

2. Reasonable selection of nodes

Nodes are the medium for interaction between the wallet and the blockchain network. Different nodes may have different security risks. Therefore, factors such as node stability, security, and speed should be comprehensively considered when selecting nodes.

3. Transaction Verification

Multiple verifications should be performed before sending a transaction, such as whether the balance is sufficient, whether the address is correct, whether the handling fee is reasonable, etc. Avoid failed transactions and unnecessary losses.

Summary:

This article briefly introduces the process and precautions for developing a blockchain wallet in PHP. With the development of blockchain technology, blockchain wallets will become more popular and their application scope will continue to expand. I hope this article can be helpful to all developers.

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