From e6f5794c15534e08c9454a5b4cb20ff88fb79d57 Mon Sep 17 00:00:00 2001
From: barrystyle <barrystyle@westnet.com.au>
Date: Fri, 14 Sep 2018 18:57:15 +0000
Subject: [PATCH] provides positive integer for versionBits

---
 src/rpc/mining.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index e15fc7142..d898329c1 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -711,6 +711,11 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
 
     UniValue result(UniValue::VOBJ);
     result.push_back(Pair("capabilities", aCaps));
+
+    // resolves -ve overflow
+    Consensus::DeploymentPos pos = Consensus::DeploymentPos();
+    pblock->nVersion &= ~VersionBitsMask(consensusParams, pos);
+
     result.push_back(Pair("version", pblock->nVersion));
     result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
     result.push_back(Pair("transactions", transactions));