/** EOS  https://github.com/espritblock/eos4j
     * seedPrivate
     *
     * @param seed
     * @return
     */
    public static String seedPrivate(String seed) {
        if (seed == null || seed.length() == 0) {
            throw new EException("args_empty", "args is empty");
        }
        byte[] a = { (byte) 0x80 };
        byte[] b = new BigInteger(Sha.SHA256(seed)).toByteArray();
        byte[] private_key = ByteUtils.concat(a, b);
        byte[] checksum = Sha.SHA256(private_key);
        checksum = Sha.SHA256(checksum);
        byte[] check = ByteUtils.copy(checksum, 0, 4);
        byte[] pk = ByteUtils.concat(private_key, check);
        return Base58.encode(pk);
    }

	//ETH https://github.com/web3j/web3j
	public static String seedPrivate(String mnemonic) {
			byte[] seed = MnemonicUtils.generateSeed(mnemonic,PASSPHRASE);
			ECKeyPair keypair = ECKeyPair.create(sha256(seed));
			return keypair.getPrivateKey().toString(16);
	}
	//BTC  https://github.com/Samourai-Wallet/samourai-wallet-android
    public HD_Wallet(int purpose, MnemonicCode mc, NetworkParameters params, byte[] seed, String passphrase, int nbAccounts) throws MnemonicException.MnemonicLengthException {

        mParams = params;
        mSeed = seed;
        strPassphrase = passphrase;

        mWordList = mc.toMnemonic(mSeed);
        byte[] hd_seed = MnemonicCode.toSeed(mWordList, strPassphrase);
        mKey = HDKeyDerivation.createMasterPrivateKey(hd_seed);
        DeterministicKey t1 = HDKeyDerivation.deriveChildKey(mKey, purpose| ChildNumber.HARDENED_BIT);
        mRoot = HDKeyDerivation.deriveChildKey(t1, ChildNumber.HARDENED_BIT);

        mAccounts = new ArrayList<HD_Account>();
        for(int i = 0; i < nbAccounts; i++) {
            String acctName = String.format("account %02d", i);
            mAccounts.add(new HD_Account(mParams, mRoot, acctName, i));
        }

    }