diff --git a/src/init.cpp b/src/init.cpp
index 734a797fa3a..b2f07a2d1e2 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -535,8 +535,8 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-testnet", _("Use the test network"));
 
     strUsage += HelpMessageGroup(_("Node relay options:"));
-    strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), 1));
-    strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
+    strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));
+    strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default for KMD: %u, for ACs: %u)"), MAX_OP_RETURN_RELAY_KMD, MAX_OP_RETURN_RELAY_AC));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
     strUsage += HelpMessageOpt("-blockminsize=<n>", strprintf(_("Set minimum block size in bytes (default: %u)"), 0));
@@ -1348,6 +1348,9 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 #endif // ENABLE_WALLET
 
     fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", true);
+
+    fAcceptDatacarrier = GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
+    nMaxDatacarrierBytes = chainName.isKMD() ? MAX_OP_RETURN_RELAY_KMD : MAX_OP_RETURN_RELAY_AC;
     nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);
 
     fAlerts = GetBoolArg("-alerts", DEFAULT_ALERTS);
diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index 2e547d9234b..f7219cc111e 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -32,7 +32,8 @@ using namespace std;
 
 typedef vector<unsigned char> valtype;
 
-unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY;
+bool fAcceptDatacarrier = DEFAULT_ACCEPT_DATACARRIER;
+unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY_KMD;
 
 bool komodo_is_vSolutionsFixActive(); // didn't want to bring komodo headers here, it's a special case to bypass bad code in Solver() and ExtractDestination() 
 
@@ -346,7 +347,10 @@ bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
             return false;
         if (m < 1 || m > n)
             return false;
-    }
+    }  else if (whichType == TX_NULL_DATA &&
+               (!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes))
+          return false;
+
     return whichType != TX_NONSTANDARD;
 }
 
diff --git a/src/script/standard.h b/src/script/standard.h
index 2eb1f40ce4e..fb315322549 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -28,6 +28,8 @@
 
 #include <stdint.h>
 
+static const bool DEFAULT_ACCEPT_DATACARRIER = true;
+
 class CKeyID;
 class CScript;
 
@@ -40,7 +42,10 @@ class CScriptID : public uint160
     CScriptID(const uint160& in) : uint160(in) {}
 };
 
-static const unsigned int MAX_OP_RETURN_RELAY = 8192;      //! bytes
+static const unsigned int MAX_OP_RETURN_RELAY_KMD = 140; /* 76 bytes of nota size + 64 bytes chain name */
+static const unsigned int MAX_OP_RETURN_RELAY_AC = 208;  /* 144 bytes of nota size + 64 bytes chain name */
+
+extern bool fAcceptDatacarrier;
 extern unsigned nMaxDatacarrierBytes;
 
 /**