diff --git a/src/main.cpp b/src/main.cpp
index 2de5a25dd7f..7d0d52424ed 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1434,6 +1434,7 @@ bool CheckTransaction(uint32_t tiptime,const CTransaction& tx, CValidationState
     }
 }
 
+// ARRR notary exception
 int32_t komodo_isnotaryvout(char *coinaddr,uint32_t tiptime) // from ac_private chains only
 {
     int32_t season = getacseason(tiptime);
@@ -1460,7 +1461,7 @@ int32_t komodo_acpublic(uint32_t tiptime);
 bool CheckTransactionWithoutProofVerification(uint32_t tiptime,const CTransaction& tx, CValidationState &state)
 {
     // Basic checks that don't depend on any context
-    int32_t invalid_private_taddr=0,z_z=0,z_t=0,t_z=0,acpublic = komodo_acpublic(tiptime);
+    int32_t invalid_private_taddr=0,z_z=0,z_t=0,t_z=0,acpublic = komodo_acpublic(tiptime), current_season = getacseason(tiptime);
     /**
      * Previously:
      * 1. The consensus rule below was:
@@ -1571,9 +1572,18 @@ bool CheckTransactionWithoutProofVerification(uint32_t tiptime,const CTransactio
     }
     if ( ASSETCHAINS_PRIVATE != 0 && invalid_private_taddr != 0 && tx.vShieldedSpend.empty() == 0 )
     {
-        return state.DoS(100, error("CheckTransaction(): this is a private chain, no sapling -> taddr"),
-                         REJECT_INVALID, "bad-txns-acprivate-chain");
+        if ( !( current_season > 5 &&
+                tx.vin.size() == 0 &&
+                tx.vout.size() == 2 &&
+                tx.vout[0].scriptPubKey.IsPayToScriptHash() &&
+                tx.vout[0].scriptPubKey.IsRedeemScriptReveal(tx.vout[1].scriptPubKey) )) {
+                    return state.DoS(100, error("CheckTransaction(): this is a private chain, no sapling -> taddr"),
+                                     REJECT_INVALID, "bad-txns-acprivate-chain");
+                } else {
+                    invalid_private_taddr = false;
+                }
     }
+
     // Check for overflow valueBalance
     if (tx.valueBalance > MAX_MONEY || tx.valueBalance < -MAX_MONEY) {
         return state.DoS(100, error("CheckTransaction(): abs(tx.valueBalance) too large"),
@@ -5160,7 +5170,7 @@ bool CheckBlock(int32_t *futureblockp,int32_t height,CBlockIndex *pindex,const C
     {
         int32_t notaryid;
         int32_t special = komodo_chosennotary(&notaryid,height,pubkey33,tiptime);
-        if (notaryid > 0) {
+        if (notaryid > 0 || ( notaryid == 0 && height > nS5HardforkHeight ) ) {
             CScript merkleroot = CScript();
             CBlock blockcopy = block; // block shouldn't be changed below, so let's make it's copy
             CBlock *pblockcopy = (CBlock *)&blockcopy;
diff --git a/src/script/script.cpp b/src/script/script.cpp
index 69e340758e5..0df33bf2cff 100644
--- a/src/script/script.cpp
+++ b/src/script/script.cpp
@@ -24,6 +24,7 @@
 #include "utilstrencodings.h"
 #include "script/cc.h"
 #include "cc/eval.h"
+#include "standard.h"
 #include "cryptoconditions/include/cryptoconditions.h"
 
 using namespace std;
@@ -255,6 +256,93 @@ bool CScript::IsPayToScriptHash() const
             (*this)[22] == OP_EQUAL);
 }
 
+bool CScript::IsRedeemScriptReveal(CScript scriptpubkey) const{
+    CScript check_spk, redeemScript = scriptpubkey;
+    if (
+        // these magic numbers correspond to a typical(as of May 2021) atomicdex HLTC
+        redeemScript.size() == 110 &&
+        redeemScript[0] == OP_RETURN &&
+        redeemScript[3] == OP_IF &&
+        redeemScript[9] == OP_NOP2 &&
+        redeemScript[10] == OP_DROP &&
+        redeemScript[45] == OP_CHECKSIG &&
+        redeemScript[46] == OP_ELSE &&
+        redeemScript[47] == OP_SIZE &&
+        redeemScript[48] == 0x01 &&
+        redeemScript[49] == 0x20 &&
+        redeemScript[50] == OP_EQUALVERIFY &&
+        redeemScript[51] == OP_HASH160 &&
+        redeemScript[73] == OP_EQUALVERIFY &&
+        redeemScript[108] == OP_CHECKSIG &&
+        redeemScript[109] == OP_ENDIF
+    ) {
+        // Drop the OP_RETURN and OP_PUSHDATA1 + byte
+        redeemScript.erase(redeemScript.begin(),redeemScript.begin()+3 );
+        check_spk << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+        return (check_spk == (*this));
+    }
+
+    if (
+        /*
+        these magic numbers correspond to:
+
+        OP_IF 32_bitlocktime OP_CHECKLOCKTIMEVERIFY OP_DROP pubkey OP_CHECKSIG
+        OP_ELSE OP_SIZE 0x20 OP_EQUALVERIFY
+        OP_SHA256  0000000000000000000000000000000000000000000000000000000000000000 OP_EQUALVERIFY pubkey OP_CHECKSIG OP_ENDIF
+
+        This is neccesary for coins that do not support ripemd160.
+        It is a typical HLTC with OP_SHA256 instead of OP_HASH160
+        */
+        redeemScript.size() == 122 &&
+        redeemScript[0] == OP_RETURN &&
+        redeemScript[3] == OP_IF &&
+        redeemScript[9] == OP_NOP2 &&
+        redeemScript[10] == OP_DROP &&
+        redeemScript[45] == OP_CHECKSIG &&
+        redeemScript[46] == OP_ELSE &&
+        redeemScript[47] == OP_SIZE &&
+        redeemScript[48] == 0x01 &&
+        redeemScript[49] == 0x20 &&
+        redeemScript[50] == OP_EQUALVERIFY &&
+        ( redeemScript[51] == OP_SHA256 || redeemScript[51] == OP_HASH256 ) &&
+        redeemScript[85] == OP_EQUALVERIFY &&
+        redeemScript[120] == OP_CHECKSIG &&
+        redeemScript[121] == OP_ENDIF
+    ) {
+        // Drop the OP_RETURN and OP_PUSHDATA1 + byte
+        redeemScript.erase(redeemScript.begin(),redeemScript.begin()+3 );
+        check_spk << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+        return (check_spk == (*this));
+    }
+
+    if (
+        // these magic numbers correspond to:
+        // 16_arbitrary_bytes OP_DROP 
+        // OP_IF 32bit_locktime OP_NOP2 OP_DROP pubkey OP_CHECKSIG 
+        // OP_ELSE pubkey OP_CHECKSIG OP_ENDIF
+        // as provided by artem 
+        redeemScript.size() == 101 &&
+        redeemScript[0] == OP_RETURN &&
+        redeemScript[1] == 0x4c && // PUSH_BYTES
+        redeemScript[2] == 0x62 && // BYTES
+        redeemScript[20] == OP_DROP &&
+        redeemScript[21] == OP_IF &&
+        redeemScript[22] == 0x04 && // 32bit locktime
+        redeemScript[27] == OP_NOP2 &&
+        redeemScript[28] == OP_DROP &&
+        redeemScript[63] == OP_CHECKSIG &&
+        redeemScript[64] == OP_ELSE &&
+        redeemScript[99] == OP_CHECKSIG &&
+        redeemScript[100] == OP_ENDIF
+    ) {
+        // Drop the OP_RETURN and OP_PUSHDATA1 + byte
+        redeemScript.erase(redeemScript.begin(),redeemScript.begin()+3 );
+        check_spk << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
+        return (check_spk == (*this));
+    }
+    return(false);
+}
+
 // this returns true if either there is nothing left and pc points at the end, or 
 // all instructions from the pc to the end of the script are balanced pushes and pops
 // if there is data, it also returns all the values as byte vectors in a list of vectors
diff --git a/src/script/script.h b/src/script/script.h
index 1d5af105d0b..00d68e18753 100644
--- a/src/script/script.h
+++ b/src/script/script.h
@@ -598,6 +598,9 @@ class CScript : public CScriptBase
     bool IsCoinImport() const;
     bool MayAcceptCryptoCondition() const;
 
+    // zHLTC
+    bool IsRedeemScriptReveal(CScript scriptpubkey) const;
+
     /** Called by IsStandardTx and P2SH/BIP62 VerifyScript (which makes it consensus-critical). */
     bool IsPushOnly(const_iterator pc) const;
     bool IsPushOnly() const;