DefaultChain constructor
      
      DefaultChain()
     
    
    
Implementation
DefaultChain()
    : super(
          name: 'default',
          mainnet: WalletSetting(
            bip44Path: BTC_PATH,
            addressType: AddressType.NONE,
          ),
          testnet: WalletSetting(
            bip44Path: BTC_PATH,
            addressType: AddressType.NONE,
          ));