diff --git a/modules/block/src/main/kotlin/jp/co/soramitsu/iroha2/Serde.kt b/modules/block/src/main/kotlin/jp/co/soramitsu/iroha2/Serde.kt
index 8dcde1484..5cb2dbbba 100644
--- a/modules/block/src/main/kotlin/jp/co/soramitsu/iroha2/Serde.kt
+++ b/modules/block/src/main/kotlin/jp/co/soramitsu/iroha2/Serde.kt
@@ -1052,13 +1052,13 @@ private fun mintBurnSerialize(
         .cast<Expression.Raw>().value
         .cast<Value.Numeric>().numericValue
     val fieldData = when (rawValue) {
-        is NumericValue.U32 -> NumericValue.U32::class.simpleName to rawValue.u32
-        is NumericValue.U64 -> NumericValue.U64::class.simpleName to rawValue.u64
-        is NumericValue.U128 -> NumericValue.U128::class.simpleName to rawValue.u128
-        is NumericValue.Fixed -> NumericValue.Fixed::class.simpleName to rawValue.fixed.fixedPointOfI64
+        is NumericValue.U32 -> NumericValue.U32::class.simpleName to "${rawValue.u32}_${NumericValue.U32::class.simpleName?.lowercase()}"
+        is NumericValue.U64 -> NumericValue.U64::class.simpleName to "${rawValue.u64}_${NumericValue.U64::class.simpleName?.lowercase()}"
+        is NumericValue.U128 -> NumericValue.U128::class.simpleName to "${rawValue.u128}_${NumericValue.U128::class.simpleName?.lowercase()}"
+        is NumericValue.Fixed -> NumericValue.Fixed::class.simpleName to rawValue.fixed.fixedPointOfI64.toString()
         else -> throw IrohaSdkException("Grant InstructionExpr serialization error")
     }
-    gen.writeObjectField(fieldData.first, fieldData.second)
+    gen.writeObjectField("object", fieldData.second)
     gen.writeObjectField("destination_id", destinationId)
 }
 
diff --git a/modules/block/src/test/kotlin/jp/co/soramitsu/iroha2/SerializerTest.kt b/modules/block/src/test/kotlin/jp/co/soramitsu/iroha2/SerializerTest.kt
index 2541fd45c..1fdfd0ddb 100644
--- a/modules/block/src/test/kotlin/jp/co/soramitsu/iroha2/SerializerTest.kt
+++ b/modules/block/src/test/kotlin/jp/co/soramitsu/iroha2/SerializerTest.kt
@@ -1,5 +1,7 @@
 package jp.co.soramitsu.iroha2
 
+import jp.co.soramitsu.iroha2.generated.AssetDefinitionId
+import jp.co.soramitsu.iroha2.generated.AssetId
 import jp.co.soramitsu.iroha2.generated.RawGenesisBlock
 import jp.co.soramitsu.iroha2.transaction.Instructions
 import org.junit.jupiter.api.Test
@@ -45,4 +47,39 @@ class SerializerTest {
         val json = JSON_SERDE.writeValueAsString(genesis).trimIndent()
         assertEquals(expectedJson, json)
     }
+
+    @Test
+    fun `should serialize mint asset genesis block`() {
+        val genesis = Genesis(
+            RawGenesisBlock(
+                listOf(
+                    Instructions.mintAsset(
+                        AssetId(
+                            AssetDefinitionId("xor".asName(), "wonderland".asDomainId()),
+                            "alice${ACCOUNT_ID_DELIMITER}wonderland".asAccountId(),
+                        ),
+                        100,
+                    ),
+                ).let { listOf(it) },
+                Genesis.executorMode,
+            ),
+        )
+        val expectedJson = """
+            {
+              "block" : {
+                "transactions" : [ [ {
+                  "Mint" : {
+                    "object" : "100_u32",
+                    "destination_id" : {
+                      "AssetId" : "xor#wonderland#alice@wonderland"
+                    }
+                  }
+                } ] ],
+                "executor" : "executor.wasm"
+              }
+            }
+        """.trimIndent()
+        val json = JSON_SERDE.writeValueAsString(genesis).trimIndent()
+        assertEquals(expectedJson, json)
+    }
 }
diff --git a/modules/client/src/test/resources/genesis.json b/modules/client/src/test/resources/genesis.json
index 9c0205370..657cb63b7 100644
--- a/modules/client/src/test/resources/genesis.json
+++ b/modules/client/src/test/resources/genesis.json
@@ -33,10 +33,12 @@
       },
       {
         "Grant": {
-          "PermissionToken": {
-            "definition_id": "CanSetKeyValueInUserAccount",
-            "payload": {
-              "account_id": "alice@wonderland"
+          "object": {
+            "PermissionToken": {
+              "definition_id": "CanSetKeyValueInUserAccount",
+              "payload": {
+                "account_id": "alice@wonderland"
+              }
             }
           },
           "destination_id": {