Add AllowMinDifficultyBlocks chain parameter

src/chainparams.cpp

@@ -224,6 +224,8 @@ public:
         base58Prefixes[EXT_PUBLIC_KEY] = list_of(0x04)(0x35)(0x87)(0xCF);
         base58Prefixes[EXT_SECRET_KEY] = list_of(0x04)(0x35)(0x83)(0x94);
     }
+
+    virtual bool AllowMinDifficultyBlocks() const { return true; }
     virtual Network NetworkID() const { return CChainParams::TESTNET; }
 };
 static CTestNetParams testNetParams;