Bugfix: Allow mining on top of old tip blocks for testnet (fixes testnet-in-a-box use case)

src/chainparams.h

@@ -60,6 +60,7 @@ public:
     bool DefaultConsistencyChecks() const { return fDefaultConsistencyChecks; }
     /** Policy: Filter transactions that do not match well-defined patterns */
     bool RequireStandard() const { return fRequireStandard; }
+    int64_t MaxTipAge() const { return nMaxTipAge; }
     int64_t PruneAfterHeight() const { return nPruneAfterHeight; }
     /** Make miner stop after a block is found. In RPC, don't return until nGenProcLimit blocks are generated */
     bool MineBlocksOnDemand() const { return fMineBlocksOnDemand; }
@@ -80,6 +81,7 @@ protected:
     std::vector<unsigned char> vAlertPubKey;
     int nDefaultPort;
     int nMinerThreads;
+    long nMaxTipAge;
     uint64_t nPruneAfterHeight;
     std::vector<CDNSSeedData> vSeeds;
     std::vector<unsigned char> base58Prefixes[MAX_BASE58_TYPES];