diff --git a/src/base58.cpp b/src/base58.cpp
index ef5abc834..9a6945802 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -383,3 +383,16 @@ bool IsValidDestinationString(const std::string& str)
 {
     return IsValidDestinationString(str, Params());
 }
+
+bool DecodeKevaNamespace(const std::string ns, const CChainParams& params, std::vector<unsigned char>& result)
+{
+    if (!DecodeBase58Check(ns, result)) {
+        return false;
+    }
+    uint160 hash;
+    const std::vector<unsigned char>& ns_prefix = params.Base58Prefix(CChainParams::KEVA_NAMESPACE);
+    if (result.size() == hash.size() + ns_prefix.size() && std::equal(ns_prefix.begin(), ns_prefix.end(), result.begin())) {
+        return true;
+    }
+    return false;
+}
diff --git a/src/base58.h b/src/base58.h
index 39eb4eacc..32fcaffd3 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -146,5 +146,6 @@ std::string EncodeDestination(const CTxDestination& dest);
 CTxDestination DecodeDestination(const std::string& str);
 bool IsValidDestinationString(const std::string& str);
 bool IsValidDestinationString(const std::string& str, const CChainParams& params);
+bool DecodeKevaNamespace(const std::string ns, const CChainParams& params, std::vector<unsigned char>& result);
 
 #endif // BITCOIN_BASE58_H
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index d19032a58..63af3eed3 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -50,6 +50,9 @@ static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesi
  */
 static CBlock CreateGenesisBlock(uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
 {
+    // JWU TODO:
+    // 1. Change timestamp
+    // 2. Fix coinbase script using segwit.
     const char* pszTimestamp = "NY Times 05/Oct/2011 Steve Jobs, Apple’s Visionary, Dies at 56";
     const CScript genesisOutputScript = CScript() << ParseHex("049451c9ac3be691a4fa375ea69537a46ef374c1f454dbc7c2c6fe27b280f2b979991aadb29358591a1f72c326b537d7fd03e14d4978a1b57486d9e6d2c3645717") << OP_CHECKSIG;
     return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
@@ -159,6 +162,7 @@ public:
         base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,139); // M
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};
+        base58Prefixes[KEVA_NAMESPACE] = std::vector<unsigned char>(1,53); // N
 
         bech32_hrp = "kva";
 
@@ -285,6 +289,7 @@ public:
         base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
+        base58Prefixes[KEVA_NAMESPACE] = std::vector<unsigned char>(1,53); // N
 
         bech32_hrp = "tkva";
 
@@ -402,6 +407,7 @@ public:
         base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
         base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
+        base58Prefixes[KEVA_NAMESPACE] = std::vector<unsigned char>(1,53); // N
 
         bech32_hrp = "rkva";
     }
diff --git a/src/chainparams.h b/src/chainparams.h
index a52343477..3510ebc2e 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -48,6 +48,7 @@ public:
         SECRET_KEY,
         EXT_PUBLIC_KEY,
         EXT_SECRET_KEY,
+        KEVA_NAMESPACE,
 
         MAX_BASE58_TYPES
     };
diff --git a/src/keva/main.cpp b/src/keva/main.cpp
index deb2cce39..f40c73316 100644
--- a/src/keva/main.cpp
+++ b/src/keva/main.cpp
@@ -153,7 +153,8 @@ CKevaMemPool::removeConflicts(const CTransaction& tx)
 bool CKevaMemPool::validateNamespace(const CTransaction& tx, const valtype& nameSpace) const
 {
   valtype kevaNamespace = ToByteVector(Hash160(ToByteVector(tx.vin[0].prevout.hash)));
-  kevaNamespace.insert(kevaNamespace.begin(), CKevaScript::NAMESPACE_PREFIX);
+  const std::vector<unsigned char>& ns_prefix = Params().Base58Prefix(CChainParams::KEVA_NAMESPACE);
+  kevaNamespace.insert(kevaNamespace.begin(), ns_prefix.begin(), ns_prefix.end());
   return kevaNamespace == nameSpace;
 }
 
diff --git a/src/script/keva.cpp b/src/script/keva.cpp
index 0559b6d97..5f2fa7786 100644
--- a/src/script/keva.cpp
+++ b/src/script/keva.cpp
@@ -8,8 +8,6 @@
 
 const std::string CKevaScript::KEVA_DISPLAY_NAME_KEY = "_KEVA_NS_";
 
-const unsigned char CKevaScript::NAMESPACE_PREFIX = 53; // N in Base58Check
-
 CKevaScript::CKevaScript (const CScript& script)
   : op(OP_NOP), address(script)
 {
@@ -87,7 +85,7 @@ CScript CKevaScript::buildKevaNamespace(const CScript& addr, const valtype& name
   return prefix + addr;
 }
 
-CScript CKevaScript::replaceKevaNamespace(const CScript& oldScript, const uint256& txId, valtype& kaveNamespace)
+CScript CKevaScript::replaceKevaNamespace(const CScript& oldScript, const uint256& txId, valtype& kaveNamespace, const CChainParams& params)
 {
   CKevaScript kevaOp(oldScript);
   if (!kevaOp.isNamespaceRegistration()) {
@@ -97,7 +95,9 @@ CScript CKevaScript::replaceKevaNamespace(const CScript& oldScript, const uint25
 
   const valtype& displayName = kevaOp.getOpNamespaceDisplayName();
   kaveNamespace = ToByteVector(Hash160(ToByteVector(txId)));
-  kaveNamespace.insert(kaveNamespace.begin(), NAMESPACE_PREFIX);
+
+  const std::vector<unsigned char>& ns_prefix = params.Base58Prefix(CChainParams::KEVA_NAMESPACE);
+  kaveNamespace.insert(kaveNamespace.begin(), ns_prefix.begin(), ns_prefix.end());
   return CKevaScript::buildKevaNamespace(kevaOp.getAddress(), kaveNamespace, displayName);
 }
 
diff --git a/src/script/keva.h b/src/script/keva.h
index c1c222620..ee7842051 100644
--- a/src/script/keva.h
+++ b/src/script/keva.h
@@ -6,6 +6,7 @@
 #define H_BITCOIN_SCRIPT_KEVA
 
 #include <uint256.h>
+#include <chainparams.h>
 #include <script/script.h>
 
 class uint160;
@@ -45,8 +46,6 @@ public:
    */
   static const std::string KEVA_DISPLAY_NAME_KEY;
 
-  static const unsigned char NAMESPACE_PREFIX;
-
   /**
    * Parse a script and determine whether it is a valid name script.  Sets
    * the member variables representing the "picked apart" name script.
@@ -220,10 +219,10 @@ public:
   }
 
  /**
-   * Build a KEVA_NAMESPACE transaction.
+   * Build a keva namespace transaction.
    * @param addr The address script to append.
    * @param hash The hash to use.
-   * @return The full KEVA_NAMESPACE script.
+   * @return The full keva namespace script.
    */
   static CScript buildKevaNamespace(const CScript& addr, const valtype& nameSpace,
                                 const valtype& displayName);
@@ -238,7 +237,7 @@ public:
                                 const valtype& key, const valtype& value);
 
 
-  static CScript replaceKevaNamespace(const CScript& oldScript, const uint256& txId, valtype& kaveNamespace);
+  static CScript replaceKevaNamespace(const CScript& oldScript, const uint256& txId, valtype& kaveNamespace, const CChainParams& params);
 
 };
 
diff --git a/src/wallet/rpckeva.cpp b/src/wallet/rpckeva.cpp
index 30428340e..7510e6ced 100644
--- a/src/wallet/rpckeva.cpp
+++ b/src/wallet/rpckeva.cpp
@@ -230,8 +230,8 @@ UniValue keva_put(const JSONRPCRequest& request)
 
   const std::string namespaceStr = request.params[0].get_str();
   valtype nameSpace;
-  if (!DecodeBase58Check(namespaceStr, nameSpace)) {
-    throw JSONRPCError (RPC_INVALID_PARAMETER, "failed to decode namespace");
+  if (!DecodeKevaNamespace(namespaceStr, Params(), nameSpace)) {
+    throw JSONRPCError (RPC_INVALID_PARAMETER, "invalid namespace id");
   }
   if (nameSpace.size () > MAX_NAMESPACE_LENGTH)
     throw JSONRPCError (RPC_INVALID_PARAMETER, "the namespace is too long");
@@ -311,8 +311,8 @@ UniValue keva_get(const JSONRPCRequest& request)
 
   const std::string namespaceStr = request.params[0].get_str ();
   valtype nameSpace;
-  if (!DecodeBase58Check(namespaceStr, nameSpace)) {
-    throw JSONRPCError (RPC_INVALID_PARAMETER, "failed to decode namespace");
+  if (!DecodeKevaNamespace(namespaceStr, Params(), nameSpace)) {
+    throw JSONRPCError (RPC_INVALID_PARAMETER, "invalid namespace id");
   }
   if (nameSpace.size () > MAX_NAMESPACE_LENGTH)
     throw JSONRPCError (RPC_INVALID_PARAMETER, "the namespace is too long");
@@ -376,8 +376,8 @@ UniValue keva_pending(const JSONRPCRequest& request)
   if (request.params.size() == 1) {
     RPCTypeCheckArgument(request.params[0], UniValue::VSTR);
     namespaceStr = request.params[0].get_str();
-    if (!DecodeBase58Check(namespaceStr, nameSpace)) {
-      throw JSONRPCError (RPC_INVALID_PARAMETER, "failed to decode namespace");
+    if (!DecodeKevaNamespace(namespaceStr, Params(), nameSpace)) {
+      throw JSONRPCError (RPC_INVALID_PARAMETER, "invalid namespace id");
     }
   }
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index ab7c6b85d..6e72ceb41 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2951,7 +2951,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend,
                             CScript dummyScript = iter->scriptPubKey;
                             CKevaScript kevaOp(dummyScript);
                             if (kevaOp.isKevaOp() && kevaOp.isNamespaceRegistration()) {
-                                iter->scriptPubKey = CKevaScript::replaceKevaNamespace(dummyScript, coin.outpoint.hash, kaveNamespace);
+                                iter->scriptPubKey = CKevaScript::replaceKevaNamespace(dummyScript, coin.outpoint.hash, kaveNamespace, Params());
                                 kevaDummyReplaced = true;
                                 break;
                             }