code: function WalletService() {
    if (!initialized)
      throw new Error('Server not initialized');
  
    this.lock = lock;
    this.storage = storage;
    this.blockchainExplorer = blockchainExplorer;
    this.blockchainExplorerOpts = blockchainExplorerOpts;
    this.messageBroker = messageBroker;
    this.fiatRateService = fiatRateService;
    this.notifyTicker = 0;
  }
docs: Creates an instance of the Btc Wallet Service.
  @constructor