Update BKC

coins

@@ -2412,12 +2412,13 @@
 	"txfee": 0,
 	"segwit": true,
 	"mm2": 1,
-	"required_confirmations": 2,
+	"required_confirmations": 5,
 	"avg_blocktime": 30,
 	"protocol": {
 		"type": "UTXO"
 	},
 	"derivation_path": "m/44'/1918'",
+	"sign_message_prefix": "Briskcoin Signed Message:\n",
 	"trezor_coin": "Briskcoin",
    	"links": {
       		"github": "https://github.com/briskcoin-project/briskcoin",