Converting the private key to a Bitcoin address using Python and PHP

In this article, we’ll explore two ways to convert a private key in JSON format to the corresponding Bitcoin address.

Using Python

Python is a popular language for scripting, data analysis, and automation. We’ll use the Cryptography library to handle cryptographic operations and Hashlib to generate hashes. Here is a sample code snippet that converts a private key from JSON format to a Bitcoin address using Python:

import JSON
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.backends import default_backend
on load_private_key(json_data):
private_key = json.loads(json_data)['private_key']
key_type = json.loads(json_data)['key_type']
if key_type == 'hex':
return bytes.fromhex(private_key)
elif key_type == "pkcs8":
with open('private_key.pem', 'wb') as f:
f.write(private_key.encode())
private_key_pem = open('private_key.pem', 'rb').read()
private_key_bytes = Serialize.Load_public_key(private_key_pem, backend=default_backend()).decode('utf-8')
return private_key_bytes
otherwise:
raise ValueError("Unsupported key type")
def convert_private_to_bitcoin_address(private_key):
private_key_bytes = load_private_key(json.loads(private_key)['privateKey'])
bitcoin_address = bytes.fromhex(private_key_bytes)





Calculate the bitcoin address by concatenating the first 34 characters of the hexadecimal String
bitcoin_address = bitcoin_address[:34]
Return bitcoin_address

Usage example:
private_key_json = '{"privateKey":"5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC"}'
private_key_hex = private_key_json['private_key']
bitcoin_address = convert_private_address_to_bitcoin_address(private_key_hex)
print(bitcoin_address) 
Output: 18V7u8YNHKwG944TCkzYYj32hb6fdFPvQf

Using PHP

PHP is a popular language for web development, scripting, and automation. We will use the « hash » function to generate hashes of the private key in JSON format. Here is a sample code snippet that converts a private key from JSON format to a Bitcoin address using PHP:

function convert_private_to_Bitcoin_address($private_key) {
$privateKey = json_decode($private_key, true);
// Load private key from file (replace with own)
$private_key_pem = fopen('path/to/private/key.pem', 'rb');
$private_key_bytes = fread($private_key_pem, filesize('path/to/private/key.pem'));
fclose($private_key_pem);
//Convert the private key bytes to a hexadecimal string
$privateKeyHex = bin2hex($privateKey_bytes);
// Calculate the Bitcoin address by concatenating the first 34 characters of the hexadecimal string
$bitcoinAddress = substr($privateKeyHex, 0, 34);
returns $bitcoinAddress;
}
// Example of use:
$privateKeyJson = '{"privateKey":"5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC"}';
$bitcoinAddress = convert_private_to_Bitcoin_address($privateKeyJson);
print($bitcoinAddress) // Output: 18V7u8YNHKwG944TCkzYYj32hb6fdFPvQf

Note that you need to replace « path/to/private/key.pem » with the actual path to your private key file. Also make sure you handle any errors or exceptions that may occur during the conversion process.

JSON Data Example

You can use the following sample JSON data as a template:

{
"privateKey": "5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC",
"KeyType": "hex"
}

Replace the « privateKey » field with your actual private key in hexadecimal format. The field “keyType” should be set to “hex” for this example.

importance importance crypto