Coding Guidelines in Java

I. To create a new account in your client/app, you need to follow these steps:

1) Install bitcoinj library via github url:
or using gradle/maven:
2) Install fruits-kit library:
  • Maven:
// Add the JitPack repository to your build file
// Add the fruits-kit dependency
  • Gradle:
// Add the JitPack repository to your build file
repositories {
maven { url '' }
// Add the fruits-kit dependency
dependencies {
implementation 'com.github.fruits-eco-blockchain:fruits-kit4j:v1.0.0'
3) Generate your passphrase from bitcoinj library:
import org.bitcoinj.crypto.MnemonicCode;
SecureRandom secureRandom = new SecureRandom();
byte[] entropy = new byte[16];
MnemonicCode mnemonicCode = new MnemonicCode();
// This is a passphrase according to BIP39 standard.
// Currently we only accept passphrases according to this standard.
String passphraseMnemonic = String.join(" ", mnemonicCode.toMnemonic(entropy));
4) Generate keys, accountId address from passphrase
import fruits.kit.crypto.FruitsCrypto;
import org.bouncycastle.util.encoders.Hex;
final FruitsCrypto fruitsCrypto = FruitsCrypto.getInstance();
// passphraseMnemonic is generated above
byte[] privateKeyBytes = fruitsCrypto.getPrivateKey(passphraseMnemonic);
byte[] publicKeyBytes = fruitsCrypto.getPublicKey(privateKeyBytes);
// This key is used to sign transactions.
String privateKey = Hex.toHexString(privateKeyBytes);
// This key is used to active account
String publicKey = Hex.toHexString(publicKeyBytes);
// passphraseMnemonic is generated above
FruitsAddress fruitsAddress =
// Account Id: 4397003537557138002
String accountId = fruitsAddress.getFruitsID().getID();
// Address: FRUITS-7TG6-AUEJ-SWLX-8DW5-2R7C-27QB
String addressRS = fruitsAddress.getFullAddress();
5) After completing the above steps, you have a new account, but it does not exist in the FRUITS network. You need to call our active service according to the instructions below, then your account can be used.

II. To activate your account on FRUITS network, you need to follow these steps:

1) Call API to activator:
"id": accountId, //generated above
"publicKey": publicKey //generated above
  • Response:
"errorCode": 0,
"message": "",
"result": null
➔ errorCode = 0 means there is no error, you have successfully requested.
➔ errorCode = 1 means that an error has occurred, you need to check the information in the message.
2) After calling API, you need to wait about 2 - 5 minutes for the system to activate the account. After that time, you can check if the account is active or not by calling the following API, if not please contact us: