Merge pull request #1546 from rnicoll/1.17-auxpow1.17-dev

1.17 AuxPoW support

1 files changed, 20 insertions, 5 deletions

diff --git a/src/pow.cpp b/src/pow.cpp
index ab305649a..09e38cef0 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -5,8 +5,10 @@
 
 #include <pow.h>
 
+#include <auxpow.h>
 #include <arith_uint256.h>
 #include <chain.h>
+#include <dogecoin.h>
 #include <primitives/block.h>
 #include <uint256.h>
 #include <util.h>
@@ -16,8 +18,21 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
     assert(pindexLast != nullptr);
     unsigned int nProofOfWorkLimit = UintToArith256(params.powLimit).GetCompact();
 
+    // Dogecoin: Special rules for minimum difficulty blocks with Digishield
+    if (AllowDigishieldMinDifficultyForBlock(pindexLast, pblock, params))
+    {
+        // Special difficulty rule for testnet:
+        // If the new block's timestamp is more than 2* nTargetSpacing minutes
+        // then allow mining of a min-difficulty block.
+        return nProofOfWorkLimit;
+    }
+
     // Only change once per difficulty adjustment interval
-    if ((pindexLast->nHeight+1) % params.DifficultyAdjustmentInterval() != 0)
+    bool fNewDifficultyProtocol = (pindexLast->nHeight >= 145000);
+    const int64_t difficultyAdjustmentInterval = fNewDifficultyProtocol
+                                                 ? 1
+                                                 : params.DifficultyAdjustmentInterval();
+    if ((pindexLast->nHeight+1) % difficultyAdjustmentInterval != 0)
     {
         if (params.fPowAllowMinDifficultyBlocks)
         {
@@ -40,9 +55,9 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
 
     // Litecoin: This fixes an issue where a 51% attack can change difficulty at will.
     // Go back the full period unless it's the first retarget after genesis. Code courtesy of Art Forz
-    int blockstogoback = params.DifficultyAdjustmentInterval()-1;
-    if ((pindexLast->nHeight+1) != params.DifficultyAdjustmentInterval())
-        blockstogoback = params.DifficultyAdjustmentInterval();
+    int blockstogoback = difficultyAdjustmentInterval-1;
+    if ((pindexLast->nHeight+1) != difficultyAdjustmentInterval)
+        blockstogoback = difficultyAdjustmentInterval;
 
     // Go back by what we want to be 14 days worth of blocks
     int nHeightFirst = pindexLast->nHeight - blockstogoback;
@@ -50,7 +65,7 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
     const CBlockIndex* pindexFirst = pindexLast->GetAncestor(nHeightFirst);
     assert(pindexFirst);
 
-    return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
+    return CalculateDogecoinNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
 }
 
 unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)