@Before
  public void setup() {
    BriefLogFormatter.init();

    DeterministicSeed seed = new DeterministicSeed(ENTROPY, "", 0);
    masterKey = HDKeyDerivation.createMasterPrivateKey(seed.getSeedBytes());
    DeterministicHierarchy hierarchy = new DeterministicHierarchy(masterKey);
    DeterministicKey rootKey =
        hierarchy.get(ImmutableList.of(ChildNumber.ZERO_HARDENED), false, true);
    chain = new SimpleHDKeyChain(rootKey);
    chain.setLookaheadSize(10);
  }
 @Before
 public void setUp() throws Exception {
   BriefLogFormatter.init();
   params =
       new UnitTestParams() {
         @Override
         public int getInterval() {
           return 10000;
         }
       };
   context = new Context(params);
 }