code: func (s *UIServerAPI) ChainId() math.HexOrDecimal64 {
  	return (math.HexOrDecimal64)(s.extApi.chainID.Uint64())
  }
docs: // ChainId returns the chainid in use for Eip-155 replay protection
  // Example call
  // {"jsonrpc":"2.0","method":"clef_chainId","params":[], "id":8}