Update dnsseeds for mainnet. closes #1369

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/chainparams.cpp

@@ -95,13 +95,9 @@ public:
 
         vFixedSeeds.clear();
         vSeeds.clear();
-        // TODO: set up bootstrapping for mainnet
-        //vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be")); // Pieter Wuille
-        //vSeeds.push_back(CDNSSeedData("bluematt.me", "dnsseed.bluematt.me")); // Matt Corallo
-        //vSeeds.push_back(CDNSSeedData("dashjr.org", "dnsseed.bitcoin.dashjr.org")); // Luke Dashjr
-        //vSeeds.push_back(CDNSSeedData("bitcoinstats.com", "seed.bitcoinstats.com")); // Christian Decker
-        //vSeeds.push_back(CDNSSeedData("xf2.org", "bitseed.xf2.org")); // Jeff Garzik
-        //vSeeds.push_back(CDNSSeedData("bitcoin.jonasschnelli.ch", "seed.bitcoin.jonasschnelli.ch")); // Jonas Schnelli
+        vSeeds.push_back(CDNSSeedData("z.cash", "dnsseed.z.cash")); // Zcash
+        vSeeds.push_back(CDNSSeedData("str4d.xyz", "dnsseed.str4d.xyz")); // @str4d
+        vSeeds.push_back(CDNSSeedData("znodes.org", "dnsseed.znodes.org")); // @bitcartel
 
         // guarantees the first 2 characters, when base58 encoded, are "t1"
         base58Prefixes[PUBKEY_ADDRESS]     = {0x1C,0xB8};