nakov

import org.bouncycastle.util.encoders.Hex;
import org.web3j.crypto.*;
import java.math.BigInteger;

public class ECCExample {

    public static String compressPubKey(BigInteger pubKey) {
        String pubKeyYPrefix = pubKey.testBit(0) ? "03" : "02";
        String pubKeyHex = pubKey.toString(16);
        String pubKeyX = pubKeyHex.substring(0, 64);