From 2ac7991ef8f4975cf8095240064da99178a42441 Mon Sep 17 00:00:00 2001
From: mban259 <mban259@users.noreply.github.com>
Date: Mon, 29 Apr 2019 19:51:42 +0900
Subject: [PATCH] Remove IsProofOfStake

---
 src/chainparams.h    |  8 --------
 src/policy/stake.cpp | 11 -----------
 src/policy/stake.h   |  2 --
 src/validation.cpp   |  2 +-
 4 files changed, 1 insertion(+), 22 deletions(-)

diff --git a/src/chainparams.h b/src/chainparams.h
index f073a374908833..722e52ff40f509 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -25,12 +25,6 @@ struct CCheckpointData {
     MapCheckpoints mapCheckpoints;
 };
 
-typedef std::map<uint256, uint32_t> MapPoSNonce;
-
-struct CPoSNonceData {
-    MapPoSNonce mapPoSNonce;
-};
-
 /**
  * Holds various statistics on transactions within a chain. Used to estimate
  * verification progress during chain sync.
@@ -86,7 +80,6 @@ class CChainParams
     const std::vector<SeedSpec6>& FixedSeeds() const { return vFixedSeeds; }
     const CCheckpointData& Checkpoints() const { return checkpointData; }
     const ChainTxData& TxData() const { return chainTxData; }
-    const CPoSNonceData& NonceData() const { return nonceData; }
     void UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout);
 protected:
     CChainParams() {}
@@ -106,7 +99,6 @@ class CChainParams
     bool fMineBlocksOnDemand;
     CCheckpointData checkpointData;
     ChainTxData chainTxData;
-    CPoSNonceData nonceData;
     bool m_fallback_fee_enabled;
 };
 
diff --git a/src/policy/stake.cpp b/src/policy/stake.cpp
index ddaaef45384bb6..843fd942f159db 100644
--- a/src/policy/stake.cpp
+++ b/src/policy/stake.cpp
@@ -13,7 +13,6 @@
 #include <script/standard.h>
 #include <stdio.h>
 #include <key_io.h>
-#include <chainparams.h>
 
 bool AddressesEqual(const CScript& a, const CScript& b)
 {
@@ -41,13 +40,3 @@ bool AddressesEqual(const CScript& a, const CScript& b)
     //printf("a = %s b = %s\n", EncodeDestination(aAddress).c_str(), EncodeDestination(bAddress).c_str());
     return aAddress == bAddress;
 }
-
-bool IsProofOfStake(const CBlockHeader& block)
-{
-    if(block.nNonce == 0){
-        return true;
-    }
-    const MapPoSNonce& map = Params().NonceData().mapPoSNonce;
-    auto itr = map.find(block.GetHash());
-    return itr != map.end();
-}
\ No newline at end of file
diff --git a/src/policy/stake.h b/src/policy/stake.h
index 8bdbe4f4f5a466..1cd286eeb1f145 100644
--- a/src/policy/stake.h
+++ b/src/policy/stake.h
@@ -10,6 +10,4 @@
 
 bool AddressesEqual(const CScript& a, const CScript& b);
 
-bool IsProofOfStake(const CBlockHeader& block);
-
 #endif //BITCOIN_POLICY_STAKE_H
diff --git a/src/validation.cpp b/src/validation.cpp
index c57ae9462915d2..79125249539d80 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3231,7 +3231,7 @@ static bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos,
 static bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, bool fCheckPOW = true)
 {
     // Check proof of work matches claimed amount
-    if (fCheckPOW && !IsProofOfStake(block) && !CheckProofOfWork(block.GetHash(), block.nBits, consensusParams))
+    if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits, consensusParams))
         return state.DoS(50, false, REJECT_INVALID, "high-hash", false, "proof of work failed");
 
     return true;