diff --git a/src/cn_utils/cryptonote_config.h b/src/cn_utils/cryptonote_config.h
index 147e1e7ce..c427bda0b 100644
--- a/src/cn_utils/cryptonote_config.h
+++ b/src/cn_utils/cryptonote_config.h
@@ -1,21 +1,21 @@
 // Copyright (c) 2014-2018, The Monero Project
-// 
+//
 // All rights reserved.
-// 
+//
 // Redistribution and use in source and binary forms, with or without modification, are
 // permitted provided that the following conditions are met:
-// 
+//
 // 1. Redistributions of source code must retain the above copyright notice, this list of
 //    conditions and the following disclaimer.
-// 
+//
 // 2. Redistributions in binary form must reproduce the above copyright notice, this list
 //    of conditions and the following disclaimer in the documentation and/or other
 //    materials provided with the distribution.
-// 
+//
 // 3. Neither the name of the copyright holder nor the names of its contributors may be
 //    used to endorse or promote products derived from this software without specific
 //    prior written permission.
-// 
+//
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
@@ -25,7 +25,7 @@
 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-// 
+//
 // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
 
 #pragma once
@@ -63,7 +63,9 @@
 #define CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE          600
 #define CRYPTONOTE_DISPLAY_DECIMAL_POINT                12
 // COIN - number of smallest units in one coin
-#define COIN                                            ((uint64_t)1000000000000) // pow(10, 12)
+// KEVACOIN: this definition conflicts with Bitcoin's definition
+// and must be commented out!
+//#define COIN                                            ((uint64_t)1000000000000) // pow(10, 12)
 
 #define FEE_PER_KB_OLD                                  ((uint64_t)10000000000) // pow(10, 10)
 #define FEE_PER_KB                                      ((uint64_t)2000000000) // 2 * pow(10, 9)
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 85d4891af..745d0b514 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -707,7 +707,7 @@ UniValue getblockheader(const JSONRPCRequest& request)
 // Cryptonote RPC API: getlastblockheader
 UniValue getlastblockheader(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
+    if (request.fHelp)
         throw std::runtime_error(
             "getlastblockheader\n"
             "\nResult (for verbose = true):\n"
@@ -747,29 +747,32 @@ UniValue getlastblockheader(const JSONRPCRequest& request)
     //TODO: easier way to do this?
     CAmount coinbaseValue = coinbaseTx->GetValueOut();
 
-    UniValue result(UniValue::VOBJ);
+    UniValue blockHeader(UniValue::VOBJ);
 
-    // TODO: read major/minor versions from cn header.
-    result.push_back(Pair("major_version", (uint64_t)0));
-    result.push_back(Pair("minor_version", (uint64_t)0));
+    blockHeader.push_back(Pair("major_version", (uint64_t)block.cnHeader.major_version));
+    blockHeader.push_back(Pair("minor_version", (uint64_t)block.cnHeader.minor_version));
 
-    result.push_back(Pair("timestamp", (uint64_t)pblockindex->nTime));
-    result.push_back(Pair("prev_hash", pblockindex->pprev->GetBlockHash().GetHex()));
-    result.push_back(Pair("nonce", (uint64_t)pblockindex->nNonce));
-    result.push_back(Pair("orphan_status", false));
-    result.push_back(Pair("height", (uint64_t)pblockindex->nHeight));
+    blockHeader.push_back(Pair("timestamp", (uint64_t)pblockindex->nTime));
+    blockHeader.push_back(Pair("prev_hash", pblockindex->pprev->GetBlockHash().GetHex()));
+    blockHeader.push_back(Pair("nonce", (uint64_t)pblockindex->nNonce));
+    blockHeader.push_back(Pair("orphan_status", false));
+    blockHeader.push_back(Pair("height", (uint64_t)pblockindex->nHeight));
     const uint64_t depth = chainActive.Height() - pblockindex->nHeight + 1; // Same as confirmations.
-    result.push_back(Pair("depth", (uint64_t)depth));
-    result.push_back(Pair("hash", pblockindex->GetBlockHash().GetHex()));
-    result.push_back(Pair("difficulty", GetDifficulty(pblockindex)));
+    blockHeader.push_back(Pair("depth", (uint64_t)depth));
+    blockHeader.push_back(Pair("hash", pblockindex->GetBlockHash().GetHex()));
+    blockHeader.push_back(Pair("difficulty", GetDifficulty(pblockindex)));
 
     // TODO: implement cumulative_difficulty
-    result.push_back(Pair("cumulative_difficulty", 0));
-    result.push_back(Pair("reward", (uint64_t)coinbaseValue));
-    result.push_back(Pair("block_size", (int)::GetBlockWeight(block)));
-    result.push_back(Pair("num_txes", (uint64_t)pblockindex->nTx));
-    result.push_back(Pair("pow_hash", pblockindex->GetBlockPoWHash().GetHex()));
-    result.push_back(Pair("long_term_weight", 0.0)); // Not implemented
+    blockHeader.push_back(Pair("cumulative_difficulty", 0));
+    blockHeader.push_back(Pair("reward", (uint64_t)coinbaseValue));
+    blockHeader.push_back(Pair("block_size", (int)::GetBlockWeight(block)));
+    blockHeader.push_back(Pair("num_txes", (uint64_t)pblockindex->nTx));
+    blockHeader.push_back(Pair("pow_hash", block.GetPoWHash().GetHex()));
+    blockHeader.push_back(Pair("long_term_weight", 0.0)); // Not implemented
+
+    UniValue result(UniValue::VOBJ);
+    result.push_back(Pair("block_header", blockHeader));
+    result.push_back(Pair("status", "OK"));
     return result;
 }
 
@@ -823,29 +826,33 @@ UniValue getblockheaderbyheight(const JSONRPCRequest& request)
     //TODO: easier way to do this?
     CAmount coinbaseValue = coinbaseTx->GetValueOut();
 
-    UniValue result(UniValue::VOBJ);
+    UniValue blockHeader(UniValue::VOBJ);
 
-    // TODO: read major/minor versions from cn header.
-    result.push_back(Pair("major_version", (uint64_t)0));
-    result.push_back(Pair("minor_version", (uint64_t)0));
+    blockHeader.push_back(Pair("major_version", (uint64_t)block.cnHeader.major_version));
+    blockHeader.push_back(Pair("minor_version", (uint64_t)block.cnHeader.minor_version));
 
-    result.push_back(Pair("timestamp", (uint64_t)pblockindex->nTime));
-    result.push_back(Pair("prev_hash", pblockindex->pprev->GetBlockHash().GetHex()));
-    result.push_back(Pair("nonce", (uint64_t)pblockindex->nNonce));
-    result.push_back(Pair("orphan_status", false));
-    result.push_back(Pair("height", (uint64_t)pblockindex->nHeight));
+    blockHeader.push_back(Pair("timestamp", (uint64_t)pblockindex->nTime));
+    blockHeader.push_back(Pair("prev_hash", pblockindex->pprev->GetBlockHash().GetHex()));
+    blockHeader.push_back(Pair("nonce", (uint64_t)pblockindex->nNonce));
+    blockHeader.push_back(Pair("orphan_status", false));
+    blockHeader.push_back(Pair("height", (uint64_t)pblockindex->nHeight));
     const uint64_t depth = chainActive.Height() - nHeight + 1; // Same as confirmations.
-    result.push_back(Pair("depth", (uint64_t)depth));
-    result.push_back(Pair("hash", pblockindex->GetBlockHash().GetHex()));
-    result.push_back(Pair("difficulty", GetDifficulty(pblockindex)));
+    blockHeader.push_back(Pair("depth", (uint64_t)depth));
+    blockHeader.push_back(Pair("hash", pblockindex->GetBlockHash().GetHex()));
+    blockHeader.push_back(Pair("difficulty", GetDifficulty(pblockindex)));
 
     // TODO: implement cumulative_difficulty
-    result.push_back(Pair("cumulative_difficulty", 0));
-    result.push_back(Pair("reward", (uint64_t)coinbaseValue));
-    result.push_back(Pair("block_size", (int)::GetBlockWeight(block)));
-    result.push_back(Pair("num_txes", (uint64_t)pblockindex->nTx));
-    result.push_back(Pair("pow_hash", pblockindex->GetBlockPoWHash().GetHex()));
-    result.push_back(Pair("long_term_weight", 0.0)); // Not implemented
+    blockHeader.push_back(Pair("cumulative_difficulty", 0));
+    blockHeader.push_back(Pair("reward", (uint64_t)coinbaseValue));
+    blockHeader.push_back(Pair("block_size", (int)::GetBlockWeight(block)));
+    blockHeader.push_back(Pair("num_txes", (uint64_t)pblockindex->nTx));
+    blockHeader.push_back(Pair("pow_hash", block.GetPoWHash().GetHex()));
+    blockHeader.push_back(Pair("long_term_weight", 0.0)); // Not implemented
+
+    UniValue result(UniValue::VOBJ);
+    result.push_back(Pair("status", "OK"));
+    result.push_back(Pair("block_header", blockHeader));
+
     return result;
 }
 
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 171ba1c6b..57fdcfe6c 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -300,8 +300,11 @@ UniValue CN_JSONRPCError(int code, const std::string& message)
 // NOTE: Assumes a conclusive result; if result is inconclusive, it must be handled by caller
 static UniValue BIP22ValidationResult(const CValidationState& state)
 {
-    if (state.IsValid())
-        return NullUniValue;
+    if (state.IsValid()) {
+        UniValue result(UniValue::VOBJ);
+        result.push_back(Pair("status", "OK"));
+        return result;
+    }
 
     std::string strRejectReason = state.GetRejectReason();
     if (state.IsError())