Remove DNS Seeds run by entities which were never well-established.

doc/dnsseed-policy.md

@@ -3,6 +3,9 @@ Expectations for DNS Seed operators
 
 Bitcoin Core attempts to minimize the level of trust in DNS seeds,
 but DNS seeds still pose a small amount of risk for the network.
+As such, DNS seeds must be run by entities which have some minimum
+level of trust within the Bitcoin community.
+
 Other implementations of Bitcoin software may also use the same
 seeds and may be more exposed. In light of this exposure this
 document establishes some basic expectations for the expectations

src/chainparams.cpp

@@ -99,7 +99,6 @@ public:
         vSeeds.push_back(CDNSSeedData("dashjr.org", "dnsseed.bitcoin.dashjr.org"));
         vSeeds.push_back(CDNSSeedData("bitcoinstats.com", "seed.bitcoinstats.com"));
         vSeeds.push_back(CDNSSeedData("bitnodes.io", "seed.bitnodes.io"));
-        vSeeds.push_back(CDNSSeedData("open-nodes.org", "seeds.bitcoin.open-nodes.org"));
         vSeeds.push_back(CDNSSeedData("xf2.org", "bitseed.xf2.org"));
 
         base58Prefixes[PUBKEY_ADDRESS] = list_of(0);