Define start and end time for segwit deployment

Github-Pull: #8937
Rebased-From: f9c23dea97

src/chainparams.cpp

@@ -92,10 +92,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1462060800; // May 1st, 2016
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1493596800; // May 1st, 2017
 
-        // Deployment of SegWit (BIP141 and BIP143)
+        // Deployment of SegWit (BIP141, BIP143, and BIP147)
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
-        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 0;
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1479168000; // November 15th, 2016.
-        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 0; // Never / undefined
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1510704000; // November 15th, 2017.
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -188,7 +188,7 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1456790400; // March 1st, 2016
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1493596800; // May 1st, 2017
 
-        // Deployment of SegWit (BIP141 and BIP143)
+        // Deployment of SegWit (BIP141, BIP143, and BIP147)
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1462060800; // May 1st 2016
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1493596800; // May 1st 2017

src/consensus/params.h

@@ -16,7 +16,7 @@ enum DeploymentPos
 {
     DEPLOYMENT_TESTDUMMY,
     DEPLOYMENT_CSV, // Deployment of BIP68, BIP112, and BIP113.
-    DEPLOYMENT_SEGWIT, // Deployment of BIP141 and BIP143
+    DEPLOYMENT_SEGWIT, // Deployment of BIP141, BIP143, and BIP147.
     // NOTE: Also add new deployments to VersionBitsDeploymentInfo in versionbits.cpp
     MAX_VERSION_BITS_DEPLOYMENTS
 };