diff --git a/action/protocol/staking/contract_staking_abi.json b/action/protocol/staking/contract_staking_abi_v2.json
similarity index 98%
rename from action/protocol/staking/contract_staking_abi.json
rename to action/protocol/staking/contract_staking_abi_v2.json
index 39e491aac2..e7a2672dfc 100644
--- a/action/protocol/staking/contract_staking_abi.json
+++ b/action/protocol/staking/contract_staking_abi_v2.json
@@ -1,289 +1,446 @@
 [
 	{
 		"inputs": [
+			{
+				"internalType": "address",
+				"name": "to",
+				"type": "address"
+			},
 			{
 				"internalType": "uint256",
-				"name": "_minAmount",
+				"name": "tokenId",
+				"type": "uint256"
+			}
+		],
+		"name": "approve",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
+	},
+	{
+		"inputs": [
+			{
+				"internalType": "uint256",
+				"name": "_bucketId",
 				"type": "uint256"
 			},
 			{
-				"internalType": "address payable",
-				"name": "_beneficiary",
+				"internalType": "address",
+				"name": "_delegate",
 				"type": "address"
 			}
 		],
+		"name": "changeDelegate",
+		"outputs": [],
 		"stateMutability": "nonpayable",
-		"type": "constructor"
-	},
-	{
-		"inputs": [],
-		"name": "ErrInvalidAmount",
-		"type": "error"
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrInvalidDuration",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256[]",
+				"name": "_bucketIds",
+				"type": "uint256[]"
+			},
+			{
+				"internalType": "address",
+				"name": "_delegate",
+				"type": "address"
+			}
+		],
+		"name": "changeDelegates",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrInvalidParameter",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256",
+				"name": "_bucketId",
+				"type": "uint256"
+			},
+			{
+				"internalType": "uint256",
+				"name": "_amount",
+				"type": "uint256"
+			}
+		],
+		"name": "donate",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrNotLockedBucket",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256",
+				"name": "_bucketId",
+				"type": "uint256"
+			},
+			{
+				"internalType": "uint256",
+				"name": "_newDuration",
+				"type": "uint256"
+			}
+		],
+		"name": "expandBucket",
+		"outputs": [],
+		"stateMutability": "payable",
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrNotOwner",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256",
+				"name": "_bucketId",
+				"type": "uint256"
+			},
+			{
+				"internalType": "uint256",
+				"name": "_duration",
+				"type": "uint256"
+			}
+		],
+		"name": "lock",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrNotReady",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256[]",
+				"name": "_bucketIds",
+				"type": "uint256[]"
+			},
+			{
+				"internalType": "uint256",
+				"name": "_duration",
+				"type": "uint256"
+			}
+		],
+		"name": "lock",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "ErrNotStakedBucket",
-		"type": "error"
+		"inputs": [
+			{
+				"internalType": "uint256[]",
+				"name": "bucketIds",
+				"type": "uint256[]"
+			},
+			{
+				"internalType": "uint256",
+				"name": "_newDuration",
+				"type": "uint256"
+			}
+		],
+		"name": "merge",
+		"outputs": [],
+		"stateMutability": "payable",
+		"type": "function"
 	},
 	{
 		"inputs": [],
-		"name": "ErrNotUnstakedBucket",
-		"type": "error"
+		"name": "pause",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
 		"inputs": [],
-		"name": "ErrTransferFailed",
-		"type": "error"
+		"name": "renounceOwnership",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
 				"internalType": "address",
-				"name": "owner",
+				"name": "from",
 				"type": "address"
 			},
 			{
-				"indexed": true,
 				"internalType": "address",
-				"name": "approved",
+				"name": "to",
 				"type": "address"
 			},
 			{
-				"indexed": true,
 				"internalType": "uint256",
 				"name": "tokenId",
 				"type": "uint256"
 			}
 		],
-		"name": "Approval",
-		"type": "event"
+		"name": "safeTransferFrom",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
 				"internalType": "address",
-				"name": "owner",
+				"name": "from",
 				"type": "address"
 			},
 			{
-				"indexed": true,
+				"internalType": "address",
+				"name": "to",
+				"type": "address"
+			},
+			{
+				"internalType": "uint256",
+				"name": "tokenId",
+				"type": "uint256"
+			},
+			{
+				"internalType": "bytes",
+				"name": "data",
+				"type": "bytes"
+			}
+		],
+		"name": "safeTransferFrom",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
+	},
+	{
+		"inputs": [
+			{
 				"internalType": "address",
 				"name": "operator",
 				"type": "address"
 			},
 			{
-				"indexed": false,
 				"internalType": "bool",
 				"name": "approved",
 				"type": "bool"
 			}
 		],
-		"name": "ApprovalForAll",
-		"type": "event"
+		"name": "setApprovalForAll",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
+	},
+	{
+		"inputs": [
+			{
+				"internalType": "address payable",
+				"name": "_beneficiary",
+				"type": "address"
+			}
+		],
+		"name": "setBeneficiary",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
 				"internalType": "uint256",
-				"name": "bucketId",
+				"name": "_amount",
 				"type": "uint256"
 			},
 			{
-				"indexed": false,
 				"internalType": "uint256",
-				"name": "amount",
+				"name": "_duration",
 				"type": "uint256"
 			},
 			{
-				"indexed": false,
+				"internalType": "address",
+				"name": "_delegate",
+				"type": "address"
+			},
+			{
 				"internalType": "uint256",
-				"name": "duration",
+				"name": "_count",
 				"type": "uint256"
 			}
 		],
-		"name": "BucketExpanded",
-		"type": "event"
-	},
-	{
-		"anonymous": false,
-		"inputs": [
-			{
-				"indexed": true,
-				"internalType": "uint256",
-				"name": "bucketId",
-				"type": "uint256"
-			},
+		"name": "stake",
+		"outputs": [
 			{
-				"indexed": false,
-				"internalType": "address",
-				"name": "newDelegate",
-				"type": "address"
+				"internalType": "uint256[]",
+				"name": "bucketIds_",
+				"type": "uint256[]"
 			}
 		],
-		"name": "DelegateChanged",
-		"type": "event"
+		"stateMutability": "payable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
 				"internalType": "uint256",
-				"name": "bucketId",
+				"name": "_duration",
 				"type": "uint256"
 			},
 			{
-				"indexed": true,
 				"internalType": "address",
-				"name": "beneficiary",
+				"name": "_delegate",
 				"type": "address"
-			},
+			}
+		],
+		"name": "stake",
+		"outputs": [
 			{
-				"indexed": false,
 				"internalType": "uint256",
-				"name": "amount",
+				"name": "",
 				"type": "uint256"
 			}
 		],
-		"name": "Donated",
-		"type": "event"
+		"stateMutability": "payable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
 				"internalType": "uint256",
-				"name": "bucketId",
+				"name": "_amount",
 				"type": "uint256"
 			},
 			{
-				"indexed": false,
 				"internalType": "uint256",
-				"name": "duration",
+				"name": "_duration",
 				"type": "uint256"
+			},
+			{
+				"internalType": "address[]",
+				"name": "_delegates",
+				"type": "address[]"
 			}
 		],
-		"name": "Locked",
-		"type": "event"
+		"name": "stake",
+		"outputs": [
+			{
+				"internalType": "uint256[]",
+				"name": "bucketIds_",
+				"type": "uint256[]"
+			}
+		],
+		"stateMutability": "payable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": false,
-				"internalType": "uint256[]",
-				"name": "bucketIds",
-				"type": "uint256[]"
+				"internalType": "address",
+				"name": "from",
+				"type": "address"
 			},
 			{
-				"indexed": false,
-				"internalType": "uint256",
-				"name": "amount",
-				"type": "uint256"
+				"internalType": "address",
+				"name": "to",
+				"type": "address"
 			},
 			{
-				"indexed": false,
 				"internalType": "uint256",
-				"name": "duration",
+				"name": "tokenId",
 				"type": "uint256"
 			}
 		],
-		"name": "Merged",
-		"type": "event"
+		"name": "transferFrom",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": true,
-				"internalType": "address",
-				"name": "previousOwner",
-				"type": "address"
-			},
-			{
-				"indexed": true,
 				"internalType": "address",
 				"name": "newOwner",
 				"type": "address"
 			}
 		],
-		"name": "OwnershipTransferred",
-		"type": "event"
+		"name": "transferOwnership",
+		"outputs": [],
+		"stateMutability": "nonpayable",
+		"type": "function"
 	},
 	{
-		"anonymous": false,
 		"inputs": [
 			{
-				"indexed": false,
-				"internalType": "address",
-				"name": "account",
-				"type": "address"
+				"internalType": "uint256",
+				"name": "_minAmount",
+				"type": "uint256"
 			}
 		],
-		"name": "Paused",
-		"type": "event"
+		"stateMutability": "nonpayable",
+		"type": "constructor"
+	},
+	{
+		"inputs": [],
+		"name": "ErrInvalidAmount",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrInvalidDuration",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrInvalidParameter",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrNotLockedBucket",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrNotOwner",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrNotReady",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrNotStakedBucket",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrNotUnstakedBucket",
+		"type": "error"
+	},
+	{
+		"inputs": [],
+		"name": "ErrTransferFailed",
+		"type": "error"
 	},
 	{
 		"anonymous": false,
 		"inputs": [
 			{
 				"indexed": true,
-				"internalType": "uint256",
-				"name": "bucketId",
-				"type": "uint256"
-			},
-			{
-				"indexed": false,
 				"internalType": "address",
-				"name": "delegate",
+				"name": "owner",
 				"type": "address"
 			},
 			{
-				"indexed": false,
-				"internalType": "uint256",
-				"name": "amount",
-				"type": "uint256"
+				"indexed": true,
+				"internalType": "address",
+				"name": "approved",
+				"type": "address"
 			},
 			{
-				"indexed": false,
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "duration",
+				"name": "tokenId",
 				"type": "uint256"
 			}
 		],
-		"name": "Staked",
+		"name": "Approval",
 		"type": "event"
 	},
 	{
@@ -292,23 +449,23 @@
 			{
 				"indexed": true,
 				"internalType": "address",
-				"name": "from",
+				"name": "owner",
 				"type": "address"
 			},
 			{
 				"indexed": true,
 				"internalType": "address",
-				"name": "to",
+				"name": "operator",
 				"type": "address"
 			},
 			{
-				"indexed": true,
-				"internalType": "uint256",
-				"name": "tokenId",
-				"type": "uint256"
+				"indexed": false,
+				"internalType": "bool",
+				"name": "approved",
+				"type": "bool"
 			}
 		],
-		"name": "Transfer",
+		"name": "ApprovalForAll",
 		"type": "event"
 	},
 	{
@@ -316,25 +473,37 @@
 		"inputs": [
 			{
 				"indexed": true,
-				"internalType": "uint256",
-				"name": "bucketId",
-				"type": "uint256"
+				"internalType": "address",
+				"name": "beneficiary",
+				"type": "address"
 			}
 		],
-		"name": "Unlocked",
+		"name": "BeneficiaryChanged",
 		"type": "event"
 	},
 	{
 		"anonymous": false,
 		"inputs": [
+			{
+				"indexed": true,
+				"internalType": "uint256",
+				"name": "bucketId",
+				"type": "uint256"
+			},
 			{
 				"indexed": false,
-				"internalType": "address",
-				"name": "account",
-				"type": "address"
+				"internalType": "uint256",
+				"name": "amount",
+				"type": "uint256"
+			},
+			{
+				"indexed": false,
+				"internalType": "uint256",
+				"name": "duration",
+				"type": "uint256"
 			}
 		],
-		"name": "Unpaused",
+		"name": "BucketExpanded",
 		"type": "event"
 	},
 	{
@@ -345,9 +514,15 @@
 				"internalType": "uint256",
 				"name": "bucketId",
 				"type": "uint256"
+			},
+			{
+				"indexed": false,
+				"internalType": "address",
+				"name": "newDelegate",
+				"type": "address"
 			}
 		],
-		"name": "Unstaked",
+		"name": "DelegateChanged",
 		"type": "event"
 	},
 	{
@@ -362,229 +537,150 @@
 			{
 				"indexed": true,
 				"internalType": "address",
-				"name": "recipient",
+				"name": "beneficiary",
 				"type": "address"
-			}
-		],
-		"name": "Withdrawal",
-		"type": "event"
-	},
-	{
-		"inputs": [],
-		"name": "MAX_DURATION",
-		"outputs": [
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "",
+				"name": "amount",
 				"type": "uint256"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Donated",
+		"type": "event"
 	},
 	{
-		"inputs": [],
-		"name": "MIN_AMOUNT",
-		"outputs": [
+		"anonymous": false,
+		"inputs": [
 			{
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "",
+				"name": "bucketId",
 				"type": "uint256"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "ONE_DAY",
-		"outputs": [
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "",
+				"name": "duration",
 				"type": "uint256"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Locked",
+		"type": "event"
 	},
 	{
-		"inputs": [],
-		"name": "UINT256_MAX",
-		"outputs": [
+		"anonymous": false,
+		"inputs": [
+			{
+				"indexed": false,
+				"internalType": "uint256[]",
+				"name": "bucketIds",
+				"type": "uint256[]"
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "",
+				"name": "amount",
 				"type": "uint256"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "UNSTAKE_FREEZE_BLOCKS",
-		"outputs": [
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "",
+				"name": "duration",
 				"type": "uint256"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Merged",
+		"type": "event"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
+				"indexed": true,
 				"internalType": "address",
-				"name": "to",
+				"name": "previousOwner",
 				"type": "address"
 			},
 			{
-				"internalType": "uint256",
-				"name": "tokenId",
-				"type": "uint256"
-			}
-		],
-		"name": "approve",
-		"outputs": [],
-		"stateMutability": "nonpayable",
-		"type": "function"
-	},
-	{
-		"inputs": [
-			{
+				"indexed": true,
 				"internalType": "address",
-				"name": "owner",
+				"name": "newOwner",
 				"type": "address"
 			}
 		],
-		"name": "balanceOf",
-		"outputs": [
-			{
-				"internalType": "uint256",
-				"name": "",
-				"type": "uint256"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "OwnershipTransferred",
+		"type": "event"
 	},
 	{
-		"inputs": [],
-		"name": "beneficiary",
-		"outputs": [
+		"anonymous": false,
+		"inputs": [
 			{
-				"internalType": "address payable",
-				"name": "",
+				"indexed": false,
+				"internalType": "address",
+				"name": "account",
 				"type": "address"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Paused",
+		"type": "event"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "_bucketId",
+				"name": "bucketId",
 				"type": "uint256"
-			}
-		],
-		"name": "blocksToUnstake",
-		"outputs": [
+			},
 			{
-				"internalType": "uint256",
-				"name": "",
-				"type": "uint256"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [
+				"indexed": false,
+				"internalType": "address",
+				"name": "delegate",
+				"type": "address"
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "_bucketId",
+				"name": "amount",
 				"type": "uint256"
-			}
-		],
-		"name": "blocksToWithdraw",
-		"outputs": [
+			},
 			{
+				"indexed": false,
 				"internalType": "uint256",
-				"name": "",
+				"name": "duration",
 				"type": "uint256"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Staked",
+		"type": "event"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
-				"internalType": "uint256",
-				"name": "_bucketId",
-				"type": "uint256"
-			}
-		],
-		"name": "bucketOf",
-		"outputs": [
+				"indexed": true,
+				"internalType": "address",
+				"name": "from",
+				"type": "address"
+			},
 			{
-				"components": [
-					{
-						"internalType": "uint256",
-						"name": "amount",
-						"type": "uint256"
-					},
-					{
-						"internalType": "uint256",
-						"name": "duration",
-						"type": "uint256"
-					},
-					{
-						"internalType": "uint256",
-						"name": "unlockedAt",
-						"type": "uint256"
-					},
-					{
-						"internalType": "uint256",
-						"name": "unstakedAt",
-						"type": "uint256"
-					},
-					{
-						"internalType": "address",
-						"name": "delegate",
-						"type": "address"
-					}
-				],
-				"internalType": "struct Bucket",
-				"name": "",
-				"type": "tuple"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [
+				"indexed": true,
+				"internalType": "address",
+				"name": "to",
+				"type": "address"
+			},
 			{
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "_bucketId",
+				"name": "tokenId",
 				"type": "uint256"
-			},
-			{
-				"internalType": "address",
-				"name": "_delegate",
-				"type": "address"
 			}
 		],
-		"name": "changeDelegate",
-		"outputs": [],
-		"stateMutability": "nonpayable",
-		"type": "function"
+		"name": "Transfer",
+		"type": "event"
 	},
 	{
 		"inputs": [
@@ -592,14 +688,9 @@
 				"internalType": "uint256[]",
 				"name": "_bucketIds",
 				"type": "uint256[]"
-			},
-			{
-				"internalType": "address",
-				"name": "_delegate",
-				"type": "address"
 			}
 		],
-		"name": "changeDelegates",
+		"name": "unlock",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
@@ -610,78 +701,45 @@
 				"internalType": "uint256",
 				"name": "_bucketId",
 				"type": "uint256"
-			},
-			{
-				"internalType": "uint256",
-				"name": "_amount",
-				"type": "uint256"
 			}
 		],
-		"name": "donate",
+		"name": "unlock",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "_bucketId",
-				"type": "uint256"
-			},
-			{
-				"internalType": "uint256",
-				"name": "_newDuration",
+				"name": "bucketId",
 				"type": "uint256"
 			}
 		],
-		"name": "expandBucket",
-		"outputs": [],
-		"stateMutability": "payable",
-		"type": "function"
+		"name": "Unlocked",
+		"type": "event"
 	},
 	{
-		"inputs": [
-			{
-				"internalType": "uint256",
-				"name": "tokenId",
-				"type": "uint256"
-			}
-		],
-		"name": "getApproved",
-		"outputs": [
-			{
-				"internalType": "address",
-				"name": "",
-				"type": "address"
-			}
-		],
-		"stateMutability": "view",
+		"inputs": [],
+		"name": "unpause",
+		"outputs": [],
+		"stateMutability": "nonpayable",
 		"type": "function"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
+				"indexed": false,
 				"internalType": "address",
-				"name": "owner",
-				"type": "address"
-			},
-			{
-				"internalType": "address",
-				"name": "operator",
+				"name": "account",
 				"type": "address"
 			}
 		],
-		"name": "isApprovedForAll",
-		"outputs": [
-			{
-				"internalType": "bool",
-				"name": "",
-				"type": "bool"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Unpaused",
+		"type": "event"
 	},
 	{
 		"inputs": [
@@ -689,14 +747,9 @@
 				"internalType": "uint256",
 				"name": "_bucketId",
 				"type": "uint256"
-			},
-			{
-				"internalType": "uint256",
-				"name": "_duration",
-				"type": "uint256"
 			}
 		],
-		"name": "lock",
+		"name": "unstake",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
@@ -707,273 +760,230 @@
 				"internalType": "uint256[]",
 				"name": "_bucketIds",
 				"type": "uint256[]"
-			},
-			{
-				"internalType": "uint256",
-				"name": "_duration",
-				"type": "uint256"
 			}
 		],
-		"name": "lock",
+		"name": "unstake",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
-				"internalType": "uint256[]",
-				"name": "bucketIds",
-				"type": "uint256[]"
-			},
-			{
+				"indexed": true,
 				"internalType": "uint256",
-				"name": "_newDuration",
+				"name": "bucketId",
 				"type": "uint256"
 			}
 		],
-		"name": "merge",
-		"outputs": [],
-		"stateMutability": "payable",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "name",
-		"outputs": [
-			{
-				"internalType": "string",
-				"name": "",
-				"type": "string"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "owner",
-		"outputs": [
-			{
-				"internalType": "address",
-				"name": "",
-				"type": "address"
-			}
-		],
-		"stateMutability": "view",
-		"type": "function"
+		"name": "Unstaked",
+		"type": "event"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "tokenId",
+				"name": "_bucketId",
 				"type": "uint256"
-			}
-		],
-		"name": "ownerOf",
-		"outputs": [
+			},
 			{
-				"internalType": "address",
-				"name": "",
+				"internalType": "address payable",
+				"name": "_recipient",
 				"type": "address"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "pause",
+		"name": "withdraw",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
 	},
 	{
-		"inputs": [],
-		"name": "paused",
-		"outputs": [
+		"inputs": [
 			{
-				"internalType": "bool",
-				"name": "",
-				"type": "bool"
+				"internalType": "uint256[]",
+				"name": "_bucketIds",
+				"type": "uint256[]"
+			},
+			{
+				"internalType": "address payable",
+				"name": "_recipient",
+				"type": "address"
 			}
 		],
-		"stateMutability": "view",
-		"type": "function"
-	},
-	{
-		"inputs": [],
-		"name": "renounceOwnership",
+		"name": "withdraw",
 		"outputs": [],
 		"stateMutability": "nonpayable",
 		"type": "function"
 	},
 	{
+		"anonymous": false,
 		"inputs": [
 			{
-				"internalType": "address",
-				"name": "from",
-				"type": "address"
+				"indexed": true,
+				"internalType": "uint256",
+				"name": "bucketId",
+				"type": "uint256"
 			},
 			{
+				"indexed": true,
 				"internalType": "address",
-				"name": "to",
+				"name": "recipient",
 				"type": "address"
-			},
-			{
-				"internalType": "uint256",
-				"name": "tokenId",
-				"type": "uint256"
 			}
 		],
-		"name": "safeTransferFrom",
-		"outputs": [],
-		"stateMutability": "nonpayable",
-		"type": "function"
+		"name": "Withdrawal",
+		"type": "event"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "address",
-				"name": "from",
-				"type": "address"
-			},
-			{
-				"internalType": "address",
-				"name": "to",
+				"name": "owner",
 				"type": "address"
-			},
+			}
+		],
+		"name": "balanceOf",
+		"outputs": [
 			{
 				"internalType": "uint256",
-				"name": "tokenId",
+				"name": "",
 				"type": "uint256"
-			},
-			{
-				"internalType": "bytes",
-				"name": "data",
-				"type": "bytes"
 			}
 		],
-		"name": "safeTransferFrom",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
-		"inputs": [
+		"inputs": [],
+		"name": "beneficiary",
+		"outputs": [
 			{
-				"internalType": "address",
-				"name": "operator",
+				"internalType": "address payable",
+				"name": "",
 				"type": "address"
-			},
-			{
-				"internalType": "bool",
-				"name": "approved",
-				"type": "bool"
 			}
 		],
-		"name": "setApprovalForAll",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "_amount",
+				"name": "_bucketId",
 				"type": "uint256"
-			},
+			}
+		],
+		"name": "blocksToUnstake",
+		"outputs": [
 			{
 				"internalType": "uint256",
-				"name": "_duration",
+				"name": "",
 				"type": "uint256"
-			},
-			{
-				"internalType": "address",
-				"name": "_delegate",
-				"type": "address"
-			},
+			}
+		],
+		"stateMutability": "view",
+		"type": "function"
+	},
+	{
+		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "_count",
+				"name": "_bucketId",
 				"type": "uint256"
 			}
 		],
-		"name": "stake",
+		"name": "blocksToWithdraw",
 		"outputs": [
 			{
-				"internalType": "uint256[]",
-				"name": "bucketIds_",
-				"type": "uint256[]"
+				"internalType": "uint256",
+				"name": "",
+				"type": "uint256"
 			}
 		],
-		"stateMutability": "payable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "_duration",
+				"name": "_bucketId",
 				"type": "uint256"
-			},
-			{
-				"internalType": "address",
-				"name": "_delegate",
-				"type": "address"
 			}
 		],
-		"name": "stake",
+		"name": "bucketOf",
 		"outputs": [
 			{
-				"internalType": "uint256",
+				"components": [
+					{
+						"internalType": "uint256",
+						"name": "amount",
+						"type": "uint256"
+					},
+					{
+						"internalType": "uint256",
+						"name": "duration",
+						"type": "uint256"
+					},
+					{
+						"internalType": "uint256",
+						"name": "unlockedAt",
+						"type": "uint256"
+					},
+					{
+						"internalType": "uint256",
+						"name": "unstakedAt",
+						"type": "uint256"
+					},
+					{
+						"internalType": "address",
+						"name": "delegate",
+						"type": "address"
+					}
+				],
+				"internalType": "struct Bucket",
 				"name": "",
-				"type": "uint256"
+				"type": "tuple"
 			}
 		],
-		"stateMutability": "payable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "_amount",
-				"type": "uint256"
-			},
-			{
-				"internalType": "uint256",
-				"name": "_duration",
+				"name": "tokenId",
 				"type": "uint256"
-			},
-			{
-				"internalType": "address[]",
-				"name": "_delegates",
-				"type": "address[]"
 			}
 		],
-		"name": "stake",
+		"name": "getApproved",
 		"outputs": [
 			{
-				"internalType": "uint256[]",
-				"name": "bucketIds_",
-				"type": "uint256[]"
+				"internalType": "address",
+				"name": "",
+				"type": "address"
 			}
 		],
-		"stateMutability": "payable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
-				"internalType": "bytes4",
-				"name": "interfaceId",
-				"type": "bytes4"
+				"internalType": "address",
+				"name": "owner",
+				"type": "address"
+			},
+			{
+				"internalType": "address",
+				"name": "operator",
+				"type": "address"
 			}
 		],
-		"name": "supportsInterface",
+		"name": "isApprovedForAll",
 		"outputs": [
 			{
 				"internalType": "bool",
@@ -986,26 +996,33 @@
 	},
 	{
 		"inputs": [],
-		"name": "symbol",
+		"name": "MAX_DURATION",
 		"outputs": [
 			{
-				"internalType": "string",
+				"internalType": "uint256",
 				"name": "",
-				"type": "string"
+				"type": "uint256"
 			}
 		],
 		"stateMutability": "view",
 		"type": "function"
 	},
 	{
-		"inputs": [
+		"inputs": [],
+		"name": "MIN_AMOUNT",
+		"outputs": [
 			{
 				"internalType": "uint256",
-				"name": "tokenId",
+				"name": "",
 				"type": "uint256"
 			}
 		],
-		"name": "tokenURI",
+		"stateMutability": "view",
+		"type": "function"
+	},
+	{
+		"inputs": [],
+		"name": "name",
 		"outputs": [
 			{
 				"internalType": "string",
@@ -1017,134 +1034,138 @@
 		"type": "function"
 	},
 	{
-		"inputs": [
+		"inputs": [],
+		"name": "ONE_DAY",
+		"outputs": [
 			{
-				"internalType": "address",
-				"name": "from",
-				"type": "address"
-			},
+				"internalType": "uint256",
+				"name": "",
+				"type": "uint256"
+			}
+		],
+		"stateMutability": "view",
+		"type": "function"
+	},
+	{
+		"inputs": [],
+		"name": "owner",
+		"outputs": [
 			{
 				"internalType": "address",
-				"name": "to",
+				"name": "",
 				"type": "address"
-			},
-			{
-				"internalType": "uint256",
-				"name": "tokenId",
-				"type": "uint256"
 			}
 		],
-		"name": "transferFrom",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
+			{
+				"internalType": "uint256",
+				"name": "tokenId",
+				"type": "uint256"
+			}
+		],
+		"name": "ownerOf",
+		"outputs": [
 			{
 				"internalType": "address",
-				"name": "newOwner",
+				"name": "",
 				"type": "address"
 			}
 		],
-		"name": "transferOwnership",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
-		"inputs": [
+		"inputs": [],
+		"name": "paused",
+		"outputs": [
 			{
-				"internalType": "uint256[]",
-				"name": "_bucketIds",
-				"type": "uint256[]"
+				"internalType": "bool",
+				"name": "",
+				"type": "bool"
 			}
 		],
-		"name": "unlock",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
-				"internalType": "uint256",
-				"name": "_bucketId",
-				"type": "uint256"
+				"internalType": "bytes4",
+				"name": "interfaceId",
+				"type": "bytes4"
 			}
 		],
-		"name": "unlock",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"name": "supportsInterface",
+		"outputs": [
+			{
+				"internalType": "bool",
+				"name": "",
+				"type": "bool"
+			}
+		],
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [],
-		"name": "unpause",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"name": "symbol",
+		"outputs": [
+			{
+				"internalType": "string",
+				"name": "",
+				"type": "string"
+			}
+		],
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
 		"inputs": [
 			{
 				"internalType": "uint256",
-				"name": "_bucketId",
+				"name": "tokenId",
 				"type": "uint256"
 			}
 		],
-		"name": "unstake",
-		"outputs": [],
-		"stateMutability": "nonpayable",
-		"type": "function"
-	},
-	{
-		"inputs": [
+		"name": "tokenURI",
+		"outputs": [
 			{
-				"internalType": "uint256[]",
-				"name": "_bucketIds",
-				"type": "uint256[]"
+				"internalType": "string",
+				"name": "",
+				"type": "string"
 			}
 		],
-		"name": "unstake",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
-		"inputs": [
+		"inputs": [],
+		"name": "UINT256_MAX",
+		"outputs": [
 			{
 				"internalType": "uint256",
-				"name": "_bucketId",
+				"name": "",
 				"type": "uint256"
-			},
-			{
-				"internalType": "address payable",
-				"name": "_recipient",
-				"type": "address"
 			}
 		],
-		"name": "withdraw",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	},
 	{
-		"inputs": [
-			{
-				"internalType": "uint256[]",
-				"name": "_bucketIds",
-				"type": "uint256[]"
-			},
+		"inputs": [],
+		"name": "UNSTAKE_FREEZE_BLOCKS",
+		"outputs": [
 			{
-				"internalType": "address payable",
-				"name": "_recipient",
-				"type": "address"
+				"internalType": "uint256",
+				"name": "",
+				"type": "uint256"
 			}
 		],
-		"name": "withdraw",
-		"outputs": [],
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
 	}
 ]
\ No newline at end of file
diff --git a/action/protocol/staking/contractstake_indexer.go b/action/protocol/staking/contractstake_indexer.go
index a33fa647ff..1a3225f2ef 100644
--- a/action/protocol/staking/contractstake_indexer.go
+++ b/action/protocol/staking/contractstake_indexer.go
@@ -15,7 +15,7 @@ import (
 
 var (
 	// StakingContractJSONABI is the abi json of staking contract
-	//go:embed contract_staking_abi.json
+	//go:embed contract_staking_abi_v2.json
 	StakingContractJSONABI string
 	// StakingContractABI is the abi of staking contract
 	StakingContractABI abi.ABI
diff --git a/e2etest/contract_staking_v2_test.go b/e2etest/contract_staking_v2_test.go
index e507f82ead..8c5703fa46 100644
--- a/e2etest/contract_staking_v2_test.go
+++ b/e2etest/contract_staking_v2_test.go
@@ -83,7 +83,7 @@ func TestContractStakingV2(t *testing.T) {
 			preActs: []*actionWithTime{
 				{mustNoErr(action.SignedCandidateRegister(test.nonceMgr.pop(identityset.Address(candOwnerID).String()), "cand1", identityset.Address(1).String(), identityset.Address(1).String(), identityset.Address(candOwnerID).String(), registerAmount.String(), 1, true, nil, gasLimit, gasPrice, identityset.PrivateKey(candOwnerID), action.WithChainID(chainID))), time.Now()},
 			},
-			act:    &actionWithTime{mustNoErr(action.SignedExecution("", identityset.PrivateKey(contractCreator), test.nonceMgr.pop(identityset.Address(contractCreator).String()), big.NewInt(0), gasLimit, gasPrice, append(bytecode, mustCallData("", minAmount, common.BytesToAddress(identityset.Address(beneficiaryID).Bytes()))...), action.WithChainID(chainID))), time.Now()},
+			act:    &actionWithTime{mustNoErr(action.SignedExecution("", identityset.PrivateKey(contractCreator), test.nonceMgr.pop(identityset.Address(contractCreator).String()), big.NewInt(0), gasLimit, gasPrice, append(bytecode, mustCallData("", minAmount)...), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect, &executionExpect{contractAddress}},
 		},
 		{
@@ -94,9 +94,10 @@ func TestContractStakingV2(t *testing.T) {
 				_, ok := tmpVotes.SetString(candidate.TotalWeightedVotes, 10)
 				require.True(ok)
 			},
-			act: &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), stakeAmount, gasLimit, gasPrice, mustCallData("stake(uint256,address)", stakeDurationBlocks, common.BytesToAddress(identityset.Address(candOwnerID).Bytes())), action.WithChainID(chainID))), stakeTime},
+			preActs: []*actionWithTime{{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(contractCreator), test.nonceMgr.pop(identityset.Address(contractCreator).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("setBeneficiary(address)", common.BytesToAddress(identityset.Address(beneficiaryID).Bytes())), action.WithChainID(chainID))), stakeTime}},
+			act:     &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), stakeAmount, gasLimit, gasPrice, mustCallData("stake(uint256,address)", stakeDurationBlocks, common.BytesToAddress(identityset.Address(candOwnerID).Bytes())), action.WithChainID(chainID))), stakeTime},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 3, CreateBlockHeight: 3, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: uint64(math.MaxUint64), StakedAmount: stakeAmount.String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 4, CreateBlockHeight: 4, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: uint64(math.MaxUint64), StakedAmount: stakeAmount.String(), AutoStake: true}},
 				&candidateExpect{"cand1", &iotextypes.CandidateV2{OwnerAddress: identityset.Address(candOwnerID).String(), Id: identityset.Address(candOwnerID).String(), OperatorAddress: identityset.Address(1).String(), RewardAddress: identityset.Address(1).String(), Name: "cand1", TotalWeightedVotes: "1256001586604779503009155", SelfStakingTokens: registerAmount.String(), SelfStakeBucketIdx: 0}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand1")
@@ -110,7 +111,7 @@ func TestContractStakingV2(t *testing.T) {
 			name: "unlock",
 			act:  &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("unlock(uint256)", big.NewInt(1)), action.WithChainID(chainID))), unlockTime},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 4, CreateBlockHeight: 3, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: false}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 5, CreateBlockHeight: 4, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: false}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand1")
 					require.NoError(err)
@@ -126,7 +127,7 @@ func TestContractStakingV2(t *testing.T) {
 			name: "lock",
 			act:  &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("lock(uint256,uint256)", big.NewInt(1), big.NewInt(0).Mul(big.NewInt(2), stakeDurationBlocks)), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 3, CreateBlockHeight: 3, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 4, CreateBlockHeight: 4, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand1")
 					require.NoError(err)
@@ -145,7 +146,7 @@ func TestContractStakingV2(t *testing.T) {
 			}, genTransferActions(20)...),
 			act: &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("unstake(uint256)", big.NewInt(1)), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(2 * stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 6, CreateBlockHeight: 3, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: 27, StakedAmount: stakeAmount.String(), AutoStake: false}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 1, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID).String(), StakedDuration: uint32(2 * stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 7, CreateBlockHeight: 4, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: 28, StakedAmount: stakeAmount.String(), AutoStake: false}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand1")
 					require.NoError(err)
@@ -183,7 +184,7 @@ func TestContractStakingV2(t *testing.T) {
 			},
 			act: &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("changeDelegate(uint256,address)", big.NewInt(2), common.BytesToAddress(identityset.Address(candOwnerID2).Bytes())), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 2, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 60, CreateBlockHeight: 60, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 2, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 61, CreateBlockHeight: 61, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand1")
 					require.NoError(err)
@@ -201,8 +202,8 @@ func TestContractStakingV2(t *testing.T) {
 			},
 			act: &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0).Mul(big.NewInt(10), stakeAmount), gasLimit, gasPrice, mustCallData("stake(uint256,uint256,address,uint256)", stakeAmount, stakeDurationBlocks, common.BytesToAddress(identityset.Address(candOwnerID2).Bytes()), big.NewInt(10)), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 62, CreateBlockHeight: 62, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
-				&bucketExpect{&iotextypes.VoteBucket{Index: 12, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 62, CreateBlockHeight: 62, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 63, CreateBlockHeight: 63, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 12, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 63, CreateBlockHeight: 63, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: stakeAmount.String(), AutoStake: true}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand2")
 					require.NoError(err)
@@ -216,7 +217,7 @@ func TestContractStakingV2(t *testing.T) {
 			name: "merge",
 			act:  &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("merge(uint256[],uint256)", []*big.Int{big.NewInt(3), big.NewInt(4), big.NewInt(5)}, stakeDurationBlocks), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 62, CreateBlockHeight: 62, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(3)).String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64() / uint64(blocksPerDay)), StakedDurationBlockNumber: stakeDurationBlocks.Uint64(), CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 63, CreateBlockHeight: 63, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(3)).String(), AutoStake: true}},
 				&noBucketExpect{4, contractAddress}, &noBucketExpect{5, contractAddress},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					candidate, err := test.getCandidateByName("cand2")
@@ -233,7 +234,7 @@ func TestContractStakingV2(t *testing.T) {
 			name: "expand",
 			act:  &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), stakeAmount, gasLimit, gasPrice, mustCallData("expandBucket(uint256,uint256)", big.NewInt(3), big.NewInt(0).Mul(stakeDurationBlocks, big.NewInt(2))), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 62, CreateBlockHeight: 62, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(4)).String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 63, CreateBlockHeight: 63, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(4)).String(), AutoStake: true}},
 			},
 		},
 		{
@@ -246,7 +247,7 @@ func TestContractStakingV2(t *testing.T) {
 			},
 			act: &actionWithTime{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("donate(uint256,uint256)", big.NewInt(3), stakeAmount), action.WithChainID(chainID))), time.Now()},
 			expect: []actionExpect{successExpect,
-				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 62, CreateBlockHeight: 62, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(3)).String(), AutoStake: true}},
+				&bucketExpect{&iotextypes.VoteBucket{Index: 3, ContractAddress: contractAddress, Owner: identityset.Address(stakerID).String(), CandidateAddress: identityset.Address(candOwnerID2).String(), StakedDuration: uint32(stakeDurationBlocks.Uint64()/uint64(blocksPerDay)) * 2, StakedDurationBlockNumber: stakeDurationBlocks.Uint64() * 2, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), StakeStartBlockHeight: 63, CreateBlockHeight: 63, UnstakeStartTime: timestamppb.New(time.Time{}), UnstakeStartBlockHeight: math.MaxUint64, StakedAmount: big.NewInt(0).Mul(stakeAmount, big.NewInt(3)).String(), AutoStake: true}},
 				&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 					resp, err := test.api.GetAccount(context.Background(), &iotexapi.GetAccountRequest{Address: identityset.Address(beneficiaryID).String()})
 					require.NoError(err)
diff --git a/e2etest/native_staking_test.go b/e2etest/native_staking_test.go
index a92d76cc25..350e4044de 100644
--- a/e2etest/native_staking_test.go
+++ b/e2etest/native_staking_test.go
@@ -845,21 +845,24 @@ func TestCandidateTransferOwnership(t *testing.T) {
 		minAmount, _ := big.NewInt(0).SetString("1000000000000000000000", 10) // 1000 IOTX
 		bytecode, err := hex.DecodeString(stakingContractV2Bytecode)
 		require.NoError(err)
-		deployCode, err := staking.StakingContractABI.Constructor.Inputs.Pack(minAmount, common.BytesToAddress(identityset.Address(stakerID).Bytes()))
-		deployCode = append(bytecode, deployCode...)
-		require.NoError(err)
+		mustCallData := func(m string, args ...any) []byte {
+			data, err := abiCall(staking.StakingContractABI, m, args...)
+			require.NoError(err)
+			return data
+		}
+		deployCode := append(bytecode, mustCallData("", minAmount)...)
 		test.run([]*testcase{
 			{
 				name: "deploy staking contract",
 				act:  &actionWithTime{mustNoErr(action.SignedExecution("", identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, deployCode, action.WithChainID(chainID))), time.Now()},
 				expect: []actionExpect{
 					successExpect, &executionExpect{contractAddress},
-					&accountExpect{identityset.Address(stakerID), "99999999999999999996387414", test.nonceMgr[identityset.Address(stakerID).String()]},
 				},
 			},
 			{
 				name: "non-owner cannot migrate stake",
 				preActs: []*actionWithTime{
+					{mustNoErr(action.SignedExecution(contractAddress, identityset.PrivateKey(stakerID), test.nonceMgr.pop(identityset.Address(stakerID).String()), big.NewInt(0), gasLimit, gasPrice, mustCallData("setBeneficiary(address)", common.BytesToAddress(identityset.Address(stakerID).Bytes())), action.WithChainID(chainID))), stakeTime},
 					{mustNoErr(action.SignedCandidateRegister(test.nonceMgr.pop(identityset.Address(candOwnerID).String()), "cand1", identityset.Address(1).String(), identityset.Address(1).String(), identityset.Address(candOwnerID).String(), registerAmount.String(), 1, true, nil, gasLimit, gasPrice, identityset.PrivateKey(candOwnerID), action.WithChainID(chainID))), time.Now()},
 					{mustNoErr(action.SignedCreateStake(test.nonceMgr.pop(identityset.Address(stakerID).String()), "cand1", stakeAmount.String(), stakeDurationDays, true, nil, gasLimit, gasPrice, identityset.PrivateKey(stakerID), action.WithChainID(chainID))), stakeTime},
 				},
@@ -867,7 +870,6 @@ func TestCandidateTransferOwnership(t *testing.T) {
 				expect: []actionExpect{
 					&basicActionExpect{nil, uint64(iotextypes.ReceiptStatus_ErrUnauthorizedOperator), ""},
 					&bucketExpect{&iotextypes.VoteBucket{Index: 1, CandidateAddress: identityset.Address(candOwnerID).String(), StakedAmount: stakeAmount.String(), AutoStake: true, StakedDuration: stakeDurationDays, Owner: identityset.Address(stakerID).String(), CreateTime: timestamppb.New(stakeTime), StakeStartTime: timestamppb.New(stakeTime), UnstakeStartTime: &timestamppb.Timestamp{}}},
-					&accountExpect{identityset.Address(stakerID), "99989999999999999996377414", test.nonceMgr[identityset.Address(stakerID).String()]},
 					&candidateExpect{"cand1", &iotextypes.CandidateV2{Name: "cand1", Id: identityset.Address(candOwnerID).String(), OperatorAddress: identityset.Address(1).String(), RewardAddress: identityset.Address(1).String(), TotalWeightedVotes: "1256001586604779503009155", SelfStakingTokens: registerAmount.String(), OwnerAddress: identityset.Address(candOwnerID).String(), SelfStakeBucketIdx: 0}},
 				},
 			},
@@ -887,7 +889,7 @@ func TestCandidateTransferOwnership(t *testing.T) {
 				expect: []actionExpect{
 					successExpect,
 					&fullActionExpect{
-						address.StakingProtocolAddr, 212034,
+						address.StakingProtocolAddr, 212012,
 						[]*action.TransactionLog{
 							{
 								Type:      iotextypes.TransactionLogType_GAS_FEE,
@@ -903,7 +905,7 @@ func TestCandidateTransferOwnership(t *testing.T) {
 							},
 							{
 								Type:      iotextypes.TransactionLogType_GAS_FEE,
-								Amount:    big.NewInt(202034),
+								Amount:    big.NewInt(202012),
 								Sender:    identityset.Address(stakerID).String(),
 								Recipient: address.RewardingPoolAddr,
 							},
@@ -915,9 +917,8 @@ func TestCandidateTransferOwnership(t *testing.T) {
 							},
 						},
 					},
-					&bucketExpect{&iotextypes.VoteBucket{Index: 1, CandidateAddress: identityset.Address(candOwnerID).String(), StakedAmount: stakeAmount.String(), AutoStake: true, StakedDuration: stakeDurationDays, StakedDurationBlockNumber: uint64(stakeDurationDays) * uint64(blocksPerDay), CreateBlockHeight: 5, StakeStartBlockHeight: 5, UnstakeStartBlockHeight: math.MaxUint64, Owner: identityset.Address(stakerID).String(), ContractAddress: contractAddress, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), UnstakeStartTime: timestamppb.New(time.Time{})}},
+					&bucketExpect{&iotextypes.VoteBucket{Index: 1, CandidateAddress: identityset.Address(candOwnerID).String(), StakedAmount: stakeAmount.String(), AutoStake: true, StakedDuration: stakeDurationDays, StakedDurationBlockNumber: uint64(stakeDurationDays) * uint64(blocksPerDay), CreateBlockHeight: 6, StakeStartBlockHeight: 6, UnstakeStartBlockHeight: math.MaxUint64, Owner: identityset.Address(stakerID).String(), ContractAddress: contractAddress, CreateTime: timestamppb.New(time.Time{}), StakeStartTime: timestamppb.New(time.Time{}), UnstakeStartTime: timestamppb.New(time.Time{})}},
 					&noBucketExpect{1, ""},
-					&accountExpect{identityset.Address(stakerID), "99989999999999999996165380", test.nonceMgr[identityset.Address(stakerID).String()]},
 					&candidateExpect{"cand1", &iotextypes.CandidateV2{Name: "cand1", Id: identityset.Address(candOwnerID).String(), OperatorAddress: identityset.Address(1).String(), RewardAddress: identityset.Address(1).String(), TotalWeightedVotes: "1256001586604779503009155", SelfStakingTokens: registerAmount.String(), OwnerAddress: identityset.Address(candOwnerID).String(), SelfStakeBucketIdx: 0}},
 					&functionExpect{func(test *e2etest, act *action.SealedEnvelope, receipt *action.Receipt, err error) {
 						resp, err := test.api.GetAccount(context.Background(), &iotexapi.GetAccountRequest{
@@ -946,7 +947,6 @@ func TestCandidateTransferOwnership(t *testing.T) {
 				expect: []actionExpect{
 					successExpect,
 					&bucketExpect{&iotextypes.VoteBucket{Index: 2, CandidateAddress: identityset.Address(candOwnerID).String(), StakedAmount: unit.ConvertIotxToRau(100).String(), AutoStake: true, StakedDuration: stakeDurationDays, Owner: identityset.Address(stakerID).String(), CreateTime: timestamppb.New(stakeTime), StakeStartTime: timestamppb.New(stakeTime), UnstakeStartTime: &timestamppb.Timestamp{}}},
-					&accountExpect{identityset.Address(stakerID), "99989899999999999996155380", test.nonceMgr[identityset.Address(stakerID).String()]},
 				},
 			},
 			{
@@ -956,17 +956,16 @@ func TestCandidateTransferOwnership(t *testing.T) {
 				expect: []actionExpect{
 					&basicActionExpect{nil, uint64(iotextypes.ReceiptStatus_ErrExecutionReverted), ""},
 					&fullActionExpect{
-						address.StakingProtocolAddr, 29425, []*action.TransactionLog{
+						address.StakingProtocolAddr, 29447, []*action.TransactionLog{
 							{
 								Type:      iotextypes.TransactionLogType_GAS_FEE,
-								Amount:    big.NewInt(29425),
+								Amount:    big.NewInt(29447),
 								Sender:    identityset.Address(stakerID).String(),
 								Recipient: address.RewardingPoolAddr,
 							},
 						},
 					},
 					&bucketExpect{&iotextypes.VoteBucket{Index: 2, CandidateAddress: identityset.Address(candOwnerID).String(), StakedAmount: unit.ConvertIotxToRau(100).String(), AutoStake: true, StakedDuration: stakeDurationDays, Owner: identityset.Address(stakerID).String(), CreateTime: timestamppb.New(stakeTime), StakeStartTime: timestamppb.New(stakeTime), UnstakeStartTime: &timestamppb.Timestamp{}}},
-					&accountExpect{identityset.Address(stakerID), "99989899999999999996125955", test.nonceMgr[identityset.Address(stakerID).String()]},
 				},
 			},
 			{
@@ -1020,7 +1019,7 @@ func TestCandidateTransferOwnership(t *testing.T) {
 						GasPrice:      gasPrice.String(),
 					})
 					require.NoError(err)
-					require.Equal(uint64(194934), resp.Gas)
+					require.Equal(uint64(194912), resp.Gas)
 				}}},
 			},
 		})
diff --git a/e2etest/staking_contract_v2_bytecode b/e2etest/staking_contract_v2_bytecode
index 6689c2992f..103ae4961e 100644
--- a/e2etest/staking_contract_v2_bytecode
+++ b/e2etest/staking_contract_v2_bytecode
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/systemcontractindex/stakingindex/event_handler.go b/systemcontractindex/stakingindex/event_handler.go
index f5ed8deffe..e10c8256f0 100644
--- a/systemcontractindex/stakingindex/event_handler.go
+++ b/systemcontractindex/stakingindex/event_handler.go
@@ -82,7 +82,7 @@ func (eh *eventHandler) HandleEvent(ctx context.Context, blk *block.Block, actLo
 		return eh.handleDonatedEvent(event)
 	case "Transfer":
 		return eh.handleTransferEvent(event)
-	case "Approval", "ApprovalForAll", "OwnershipTransferred", "Paused", "Unpaused":
+	case "Approval", "ApprovalForAll", "OwnershipTransferred", "Paused", "Unpaused", "BeneficiaryChanged":
 		// not require handling events
 		return nil
 	default: