diff --git a/libraries/chain/database.cpp b/libraries/chain/database.cpp
index 304e39a..2e7234d 100644
--- a/libraries/chain/database.cpp
+++ b/libraries/chain/database.cpp
@@ -2505,7 +2505,30 @@ void database::update_last_irreversible_block()
       wit_objs.reserve( wso.num_scheduled_witnesses );
       for( int i = 0; i < wso.num_scheduled_witnesses; i++ )
          wit_objs.push_back( &get_witness( wso.current_shuffled_witnesses[i] ) );
+         
+	 if (head_block_num() > 27654722)
+	 {
+		static_assert( SMOKE_IRREVERSIBLE_THRESHOLD_0_1 > 0, "irreversible threshold must be nonzero" );
+		size_t offset = ((SMOKE_100_PERCENT - SMOKE_IRREVERSIBLE_THRESHOLD_0_1) * wit_objs.size() / SMOKE_100_PERCENT); 
+		 std::nth_element( wit_objs.begin(), wit_objs.begin() + offset, wit_objs.end(),
+         []( const witness_object* a, const witness_object* b )
+         {
+            return a->last_confirmed_block_num < b->last_confirmed_block_num;
+         } );
 
+      uint32_t new_last_irreversible_block_num = wit_objs[offset]->last_confirmed_block_num;
+
+      if( new_last_irreversible_block_num > dpo.last_irreversible_block_num )
+      {
+         modify( dpo, [&]( dynamic_global_property_object& _dpo )
+         {
+            _dpo.last_irreversible_block_num = new_last_irreversible_block_num;
+         } );
+      }
+	}
+	else
+	{
+		
       static_assert( SMOKE_IRREVERSIBLE_THRESHOLD > 0, "irreversible threshold must be nonzero" );
 
       // 1 1 1 2 2 2 2 2 2 2 -> 2     .7*10 = 7
@@ -2513,8 +2536,7 @@ void database::update_last_irreversible_block()
       // 3 3 3 3 3 3 3 3 3 3 -> 3
 
       size_t offset = ((SMOKE_100_PERCENT - SMOKE_IRREVERSIBLE_THRESHOLD) * wit_objs.size() / SMOKE_100_PERCENT);
-
-      std::nth_element( wit_objs.begin(), wit_objs.begin() + offset, wit_objs.end(),
+       std::nth_element( wit_objs.begin(), wit_objs.begin() + offset, wit_objs.end(),
          []( const witness_object* a, const witness_object* b )
          {
             return a->last_confirmed_block_num < b->last_confirmed_block_num;
@@ -2529,6 +2551,8 @@ void database::update_last_irreversible_block()
             _dpo.last_irreversible_block_num = new_last_irreversible_block_num;
          } );
       }
+	}
+     
    }
 
    commit( dpo.last_irreversible_block_num );
diff --git a/libraries/chain/witness_schedule.cpp b/libraries/chain/witness_schedule.cpp
index fff4de1..473a229 100644
--- a/libraries/chain/witness_schedule.cpp
+++ b/libraries/chain/witness_schedule.cpp
@@ -168,7 +168,7 @@ void update_witness_schedule4( database& db )
    }
 
    size_t expected_active_witnesses = std::min( size_t(SMOKE_MAX_WITNESSES), widx.size() );
-   if (db.head_block_num() > 12000000) {
+   if (db.head_block_num() > 52000000) {
       FC_ASSERT( active_witnesses.size() == expected_active_witnesses, "number of active witnesses does not equal expected_active_witnesses=${expected_active_witnesses}",
                                        ("active_witnesses.size()",active_witnesses.size()) ("SMOKE_MAX_WITNESSES",SMOKE_MAX_WITNESSES) ("expected_active_witnesses", expected_active_witnesses) );
    }
diff --git a/libraries/protocol/include/smoke/protocol/config.hpp b/libraries/protocol/include/smoke/protocol/config.hpp
index abb9750..ca655ae 100644
--- a/libraries/protocol/include/smoke/protocol/config.hpp
+++ b/libraries/protocol/include/smoke/protocol/config.hpp
@@ -141,6 +141,8 @@
 #define SMOKE_MIN_TRANSACTION_EXPIRATION_LIMIT (SMOKE_BLOCK_INTERVAL * 5) // 5 transactions per block
 
 #define SMOKE_IRREVERSIBLE_THRESHOLD          (75 * SMOKE_1_PERCENT)
+
+#define SMOKE_IRREVERSIBLE_THRESHOLD_0_1          (40 * SMOKE_1_PERCENT)
 #define VIRTUAL_SCHEDULE_LAP_LENGTH           ( fc::uint128::max_value() )
 
 /**