ref url for fun item

app/coins/btc.js

@@ -169,7 +169,8 @@ module.exports = {
 			date: "2017-12-30",
 			txid: "9bf8853b3a823bbfa1e54017ae11a9e1f4d08a854dcce9f24e08114f2c921182",
 			summary: "Block reward lost",
-			alertBodyHtml: "This coinbase transaction completely fails to collect the block's mining reward. 12.5 BTC were lost."
+			alertBodyHtml: "This coinbase transaction completely fails to collect the block's mining reward. 12.5 BTC were lost.",
+			referenceUrl: "https://bitcoin.stackexchange.com/a/67012/3397"
 		}
 	],
 	exchangeRateData:{