Data update

Task/Bitcoin-public-point-to-address/JavaScript/bitcoin-public-point-to-address.js

@@ -0,0 +1,52 @@
+const crypto = require('crypto');
+
+const digits58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
+
+function b58(n) {
+    if (n === 0n) return '';
+    return b58(n / 58n) + digits58[Number(n % 58n)];
+}
+
+function publicPointToAddress(x, y) {
+    // Convert hex strings to buffers
+    const xBuffer = Buffer.from(x, 'hex');
+    const yBuffer = Buffer.from(y, 'hex');
+
+    // Create uncompressed public key format (0x04 + x + y)
+    const publicKey = Buffer.concat([Buffer.from([0x04]), xBuffer, yBuffer]);
+
+    // SHA256 hash
+    const sha256Hash = crypto.createHash('sha256').update(publicKey).digest();
+
+    // RIPEMD160 hash
+    const ripemd160Hash = crypto.createHash('ripemd160').update(sha256Hash).digest();
+
+    // Add version byte (0x00 for mainnet)
+    const versionedHash = Buffer.concat([Buffer.from([0x00]), ripemd160Hash]);
+
+    // Double SHA256 for checksum
+    const checksum = crypto.createHash('sha256')
+        .update(crypto.createHash('sha256').update(versionedHash).digest())
+        .digest()
+        .slice(0, 4);
+
+    // Combine versioned hash with checksum
+    const addressBytes = Buffer.concat([versionedHash, checksum]);
+
+    // Convert to BigInt for base58 encoding
+    let n = 0n;
+    for (let i = 0; i < addressBytes.length; i++) {
+        n = (n << 8n) | BigInt(addressBytes[i]);
+    }
+
+    return b58(n);
+}
+
+// Test with the provided values
+if (require.main === module) {
+    const address = publicPointToAddress(
+        '50863AD64A87AE8A2FE83C1AF1A8403CB53F53E486D8511DAD8A04887E5B2352',
+        '2CD470243453A299FA9E77237716103ABC11A1DF38855ED6F2EE187E9C582BA6'
+    );
+    console.log(address);
+}