Decoding a complex JSON correctly using Golang

I'm trying to parse a JSON from a URL. But I'm facing a problem while decoding values. Some are correct and the others are nil (empty strings or nil values for float64).

The JSON fetched from the URL is like this:

{
	"status":"success", 
	"data":{ 
		"coin":{ 
			"name":"Bitcoin",
			"abbr":"BTC",
			"logo":"",
			"homepage":""
		},
		"volume":{
			"current":15967300,
			"all":21000000,
			"perc":76.03
		},
		"markets":{
			"btce":{ 
				"name":"BTC-e",
				"last_update_utc":"2016-11-05T01:25:02Z",
				"value":694.696,
				"currency":"USD",
				"daily_change":{
					"value":"699.05600000",
					"perc":-0.62,
					"diff":-4.36
				}
			},
			"coinbase":{
				"name":"Coinbase",
				"last_update_utc":"2016-11-05T01:25:02Z",
				"value":705.65,
				"currency":"USD",
				"daily_change":{ 
					"value":"700.87000000",
					"perc":0.68000000000001,
					"diff":4.78
				}
			}
		},
		"last_block":{ 
			"nb":437388,
			"time_utc":"2016-11-05T01:27:32Z",
			"nb_txs":570,
			"fee":"0.06545766",
			"difficulty":"253618246641.490000000000000"
		},
		"next_difficulty":{ 
			"difficulty":255675205724.12,
			"retarget_in":84,
			"retarget_block":437472,
			"perc":0.81104538410295
		},
		"websocket":{
			"ws_url":"ws:\/\/btc.blockr.io:9081",
			"wss_url":"wss:\/\/btc.blockr.io:8081"
		}
	},
	"code":200,
	"message":""
}

My Go structs are:

type ResponseInfo struct {
	Status  string  `json:"status"`
	Data    Info    `json:"data"` 						
	Code    float64 `json:"code"`
	Message string  `json:"message,omitempty"`
}

type Info struct {
	Coin      _Coin      `json:"coin"`					
	Volume    _Volume    `json:"volume"`				
	Markets   _Markets   `json:"markets"`				
	LastBlock _LastBlock `json:"last_block"`			
	NextDiff  _NextDiff  `json:"next_difficulty"`		
	WebSocket _WebSocket `json:"websocket"`				
}

type _Coin struct {
	Name     string `json:"name"`
	Abbr     string `json:"abbr"`
	Logo     string `json:"logo"`
	HomePage string `json:"homepage,omitempty"`
}

type _Volume struct {
	Current float64 `json:"current"`
	All     float64 `json:"all"`
	Perc    float64 `json:"perc"`
}

type _Markets struct {
	Btce     _BtceInfo     `json:"btce"`				
	Coinbase _CoinbaseInfo `json:"coinbase"`			
}

type _BtceInfo struct {
	Name        string     `json:"name"`
	LastUpdate  string     `json:"last_update_utc"`
	Value       float64    `json:"value"`
	Currency    string     `json:"currency"`
	DailyChange _BtceDaily `json:"daily_change,omitempty"`		
}

type _BtceDaily struct {
	Value string  `json:"value"`
	Prec  float64 `json:"prec"`
	Diff  float64 `json:"diff"`
}

type _CoinbaseInfo struct {
	Name        string         `json:"name"`
	LastUpdate  string         `json:"last_update_utc"`
	Value       float64        `json:"value"`
	Currency    string         `json:"currency"`
	DailyChange _CoinbaseDaily `json:"daily_change"`
}

type _CoinbaseDaily struct {
	Value string `json:"value"`
	Prec  float64 `json:"prec"`
	Diff  float64 `json:"diff"`
}

type _LastBlock struct {
	Nb         float64 `json:"nb"`
	Time       string  `json:"time_utc"`
	NbTxs      float64 `json:"nb_txs"`
	Fee        string `json:"fee"`
	Difficulty string `json:"difficulty"`
}

type _NextDiff struct {
	Difficulty    float64 `json:"difficulty"`
	RetargetIn    float64 `json:"retarget_in"`
	RetargetBlock float64 `json:"retarget_block"`
	Perc          float64 `json:"perc"`
}

type _WebSocket struct {
	Wsurl  string `json:"ws_url"`
	WssUrl string `json:"wss_url"`
}

My incorrect output is:

{success {{Bitcoin BTC  } {1.59675375e+07 2.1e+07 76.04} {{BTC-e  694 USD { 0 0}} {Coinbase  704.2 USD { 0 0}}} {0  0  } {0 0 0 0} { }} 200 }

Edit1:
Sorry the ouput my change because i'm parsing directly from the URL (http://btc.blockr.io/api/v1/coin/info)

Edit2:
Thanks to @John S Perayil who found the mistake.
My JSON Tags need to be json:"<name>" not json="<name>"

Thanks.

All your json tags need to be json:"<name>" not json="<name>"