diff --git a/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java b/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
index 5a7a247c38..b90feaf9a5 100644
--- a/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
+++ b/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
@@ -2,6 +2,7 @@
 
 import org.ethereum.config.BlockchainConfig;
 import org.ethereum.config.Constants;
+import org.ethereum.config.ConstantsAdapter;
 import org.ethereum.core.Block;
 import org.ethereum.core.BlockHeader;
 import org.ethereum.core.Repository;
@@ -29,8 +30,23 @@
  */
 public class ByzantiumConfig extends Eip160HFConfig {
 
+    private final Constants constants;
+
     public ByzantiumConfig(BlockchainConfig parent) {
         super(parent);
+        constants = new ConstantsAdapter(parent.getConstants()) {
+            private final BigInteger BLOCK_REWARD = new BigInteger("3000000000000000000");
+
+            @Override
+            public BigInteger getBLOCK_REWARD() {
+                return BLOCK_REWARD;
+            }
+        };
+    }
+
+    @Override
+    public Constants getConstants() {
+        return constants;
     }
 
     @Override
@@ -53,7 +69,7 @@ public BigInteger calcDifficulty(BlockHeader curBlock, BlockHeader parent) {
     }
 
     protected int getExplosion(BlockHeader curBlock, BlockHeader parent) {
-        int periodCount = (int) (curBlock.getNumber() / getConstants().getEXP_DIFFICULTY_PERIOD());
+        int periodCount = (int) (curBlock.getNumber() - 3_000_000 / getConstants().getEXP_DIFFICULTY_PERIOD());
         return periodCount - 2;
     }
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/core/BlockchainImpl.java b/ethereumj-core/src/main/java/org/ethereum/core/BlockchainImpl.java
index 7d130d876a..172236ac0a 100644
--- a/ethereumj-core/src/main/java/org/ethereum/core/BlockchainImpl.java
+++ b/ethereumj-core/src/main/java/org/ethereum/core/BlockchainImpl.java
@@ -166,8 +166,6 @@ public class BlockchainImpl implements Blockchain, org.ethereum.facade.Blockchai
 
     private byte[] minerCoinbase;
     private byte[] minerExtraData;
-    private BigInteger BLOCK_REWARD;
-    private BigInteger INCLUSION_REWARD;
     private int UNCLE_LIST_LIMIT;
     private int UNCLE_GENERATION_LIMIT;
 
@@ -225,8 +223,6 @@ public BlockchainImpl withParentBlockHeaderValidator(ParentBlockHeaderValidator
     private void initConst(SystemProperties config) {
         minerCoinbase = config.getMinerCoinbase();
         minerExtraData = config.getMineExtraData();
-        BLOCK_REWARD = config.getBlockchainConfig().getCommonConstants().getBLOCK_REWARD();
-        INCLUSION_REWARD = BLOCK_REWARD.divide(BigInteger.valueOf(32));
         UNCLE_LIST_LIMIT = config.getBlockchainConfig().getCommonConstants().getUNCLE_LIST_LIMIT();
         UNCLE_GENERATION_LIMIT = config.getBlockchainConfig().getCommonConstants().getUNCLE_GENERATION_LIMIT();
     }
@@ -939,10 +935,13 @@ private Map<byte[], BigInteger> addReward(Repository track, Block block, List<Tr
 
         Map<byte[], BigInteger> rewards = new HashMap<>();
 
+        BigInteger blockReward = config.getBlockchainConfig().getConfigForBlock(block.getNumber()).getConstants().getBLOCK_REWARD();
+        BigInteger inclusionReward = blockReward.divide(BigInteger.valueOf(32));
+
         // Add extra rewards based on number of uncles
         if (block.getUncleList().size() > 0) {
             for (BlockHeader uncle : block.getUncleList()) {
-                BigInteger uncleReward = BLOCK_REWARD
+                BigInteger uncleReward = blockReward
                         .multiply(BigInteger.valueOf(MAGIC_REWARD_OFFSET + uncle.getNumber() - block.getNumber()))
                         .divide(BigInteger.valueOf(MAGIC_REWARD_OFFSET));
 
@@ -956,7 +955,7 @@ private Map<byte[], BigInteger> addReward(Repository track, Block block, List<Tr
             }
         }
 
-        BigInteger minerReward = BLOCK_REWARD.add(INCLUSION_REWARD.multiply(BigInteger.valueOf(block.getUncleList().size())));
+        BigInteger minerReward = blockReward.add(inclusionReward.multiply(BigInteger.valueOf(block.getUncleList().size())));
 
         BigInteger totalFees = BigInteger.ZERO;
         for (TransactionExecutionSummary summary : summaries) {