diff --git a/lib/assigner/include/assigner.hpp b/lib/assigner/include/assigner.hpp
index ee02576..2045938 100644
--- a/lib/assigner/include/assigner.hpp
+++ b/lib/assigner/include/assigner.hpp
@@ -44,14 +44,11 @@ namespace nil {
 
             using ArithmetizationType = crypto3::zk::snark::plonk_constraint_system<BlueprintFieldType>;
 
-            constexpr static size_t BYTECODE_TABLE_INDEX = 0;
-            constexpr static size_t RW_TABLE_INDEX = 1;
-
-            assigner(std::unordered_map<uint8_t, nil::blueprint::assignment<ArithmetizationType>> &assignments):  m_assignments(assignments) {}
+            assigner(std::unordered_map<zkevm_circuit, nil::blueprint::assignment<ArithmetizationType>> &assignments):  m_assignments(assignments) {}
 
             // TODO error handling
             void handle_bytecode(size_t original_code_size, const uint8_t* code) {
-                auto it = m_assignments.find(BYTECODE_TABLE_INDEX);
+                auto it = m_assignments.find(zkevm_circuit::BYTECODE);
                 if (it == m_assignments.end()) {
                     return;
                 }
@@ -61,7 +58,7 @@ namespace nil {
 
             // TODO error handling
             void handle_rw(std::vector<rw_operation<BlueprintFieldType>>& rw_trace) {
-                auto it = m_assignments.find(RW_TABLE_INDEX);
+                auto it = m_assignments.find(zkevm_circuit::RW);
                 if (it == m_assignments.end()) {
                     return;
                 }
@@ -69,7 +66,7 @@ namespace nil {
                     rw_trace, it->second);
             }
 
-            std::unordered_map<uint8_t, nil::blueprint::assignment<ArithmetizationType>> &m_assignments;
+            std::unordered_map<zkevm_circuit, nil::blueprint::assignment<ArithmetizationType>> &m_assignments;
         };
 
         template<typename BlueprintFieldType>
diff --git a/lib/assigner/test/assigner_test.cpp b/lib/assigner/test/assigner_test.cpp
index 2950197..f6088f8 100644
--- a/lib/assigner/test/assigner_test.cpp
+++ b/lib/assigner/test/assigner_test.cpp
@@ -25,9 +25,8 @@ class AssignerTest : public testing::Test
         nil::crypto3::zk::snark::plonk_table_description<BlueprintFieldType> desc(
             WitnessColumns, PublicInputColumns, ConstantColumns, SelectorColumns);
 
-        assignments.insert(std::pair<uint8_t, nil::blueprint::assignment<ArithmetizationType>>(0, nil::blueprint::assignment<ArithmetizationType>(desc)));
-        // for check create, call op codes, where message depth = 1
-        assignments.insert(std::pair<uint8_t, nil::blueprint::assignment<ArithmetizationType>>(1, nil::blueprint::assignment<ArithmetizationType>(desc)));
+        assignments.insert(std::pair<nil::evm_assigner::zkevm_circuit, nil::blueprint::assignment<ArithmetizationType>>(nil::evm_assigner::zkevm_circuit::BYTECODE, nil::blueprint::assignment<ArithmetizationType>(desc)));
+        assignments.insert(std::pair<nil::evm_assigner::zkevm_circuit, nil::blueprint::assignment<ArithmetizationType>>(nil::evm_assigner::zkevm_circuit::RW, nil::blueprint::assignment<ArithmetizationType>(desc)));
 
         assigner_ptr =
             std::make_shared<nil::evm_assigner::assigner<BlueprintFieldType>>(assignments);
@@ -70,7 +69,7 @@ class AssignerTest : public testing::Test
     }
 
     static std::shared_ptr<nil::evm_assigner::assigner<BlueprintFieldType>> assigner_ptr;
-    static std::unordered_map<uint8_t, nil::blueprint::assignment<ArithmetizationType>> assignments;
+    static std::unordered_map<nil::evm_assigner::zkevm_circuit, nil::blueprint::assignment<ArithmetizationType>> assignments;
     static const struct evmc_host_interface* host_interface;
     static struct evmc_host_context* ctx;
     static evmc_revision rev;
@@ -79,7 +78,7 @@ class AssignerTest : public testing::Test
 
 std::shared_ptr<nil::evm_assigner::assigner<AssignerTest::BlueprintFieldType>>
     AssignerTest::assigner_ptr;
-std::unordered_map<uint8_t, nil::blueprint::assignment<AssignerTest::ArithmetizationType>>
+std::unordered_map<nil::evm_assigner::zkevm_circuit, nil::blueprint::assignment<AssignerTest::ArithmetizationType>>
     AssignerTest::assignments;
 const struct evmc_host_interface* AssignerTest::host_interface;
 struct evmc_host_context* AssignerTest::ctx;
@@ -92,7 +91,7 @@ inline void check_eq(const uint8_t* l, const uint8_t* r, size_t len) {
     }
 }
 
-inline void rw_circuit_check(const std::unordered_map<uint8_t, nil::blueprint::assignment<AssignerTest::ArithmetizationType>> &assignments,
+inline void rw_circuit_check(const std::unordered_map<nil::evm_assigner::zkevm_circuit, nil::blueprint::assignment<AssignerTest::ArithmetizationType>> &assignments,
                              uint32_t start_row_index,
                              uint8_t operation_type,
                              uint32_t call_id,
@@ -103,7 +102,7 @@ inline void rw_circuit_check(const std::unordered_map<uint8_t, nil::blueprint::a
                              bool is_write,
                              const typename AssignerTest::BlueprintFieldType::value_type& value_hi,
                              const typename AssignerTest::BlueprintFieldType::value_type& value_lo) {
-    auto it = assignments.find(nil::evm_assigner::assigner<AssignerTest::BlueprintFieldType>::RW_TABLE_INDEX);
+    auto it = assignments.find(nil::evm_assigner::zkevm_circuit::RW);
     if (it == assignments.end()) {
         return;
     }