diff --git a/contracts/interfaces/IToposCore.sol b/contracts/interfaces/IToposCore.sol
index f5dbc4d..80e73f2 100644
--- a/contracts/interfaces/IToposCore.sol
+++ b/contracts/interfaces/IToposCore.sol
@@ -9,6 +9,7 @@ interface IToposCore {
         CertificateId prevId;
         SubnetId sourceSubnetId;
         bytes32 stateRoot;
+        bytes32 txRoot;
         bytes32 receiptRoot;
         SubnetId[] targetSubnets;
         uint32 verifier;
diff --git a/contracts/topos-core/ToposCore.sol b/contracts/topos-core/ToposCore.sol
index 7fd25e0..795d14d 100644
--- a/contracts/topos-core/ToposCore.sol
+++ b/contracts/topos-core/ToposCore.sol
@@ -62,6 +62,7 @@ contract ToposCore is IToposCore, AdminMultisigBase, Initializable {
             CertificateId prevId,
             SubnetId sourceSubnetId,
             bytes32 stateRoot,
+            bytes32 txRoot,
             bytes32 receiptRoot,
             SubnetId[] memory targetSubnets,
             uint32 verifier,
@@ -70,7 +71,7 @@ contract ToposCore is IToposCore, AdminMultisigBase, Initializable {
             bytes memory signature
         ) = abi.decode(
                 certBytes,
-                (CertificateId, SubnetId, bytes32, bytes32, SubnetId[], uint32, CertificateId, bytes, bytes)
+                (CertificateId, SubnetId, bytes32, bytes32, bytes32, SubnetId[], uint32, CertificateId, bytes, bytes)
             );
 
         certificateSet.insert(CertificateId.unwrap(certId)); // add certificate ID to the CRUD storage set
@@ -78,6 +79,7 @@ contract ToposCore is IToposCore, AdminMultisigBase, Initializable {
         newCert.prevId = prevId;
         newCert.sourceSubnetId = sourceSubnetId;
         newCert.stateRoot = stateRoot;
+        newCert.txRoot = txRoot;
         newCert.receiptRoot = receiptRoot;
         newCert.targetSubnets = targetSubnets;
         newCert.verifier = verifier;
diff --git a/test/topos-core/ToposCore.test.ts b/test/topos-core/ToposCore.test.ts
index bb9ef85..2d25b2b 100644
--- a/test/topos-core/ToposCore.test.ts
+++ b/test/topos-core/ToposCore.test.ts
@@ -11,6 +11,7 @@ describe('ToposCore', () => {
       cc.PREV_CERT_ID_0,
       cc.SOURCE_SUBNET_ID_1,
       cc.STATE_ROOT_MAX,
+      cc.TX_ROOT_MAX,
       cc.RECEIPT_ROOT_MAX,
       [cc.TARGET_SUBNET_ID_4, cc.TARGET_SUBNET_ID_5],
       cc.VERIFIER,
@@ -141,6 +142,7 @@ describe('ToposCore', () => {
           cc.PREV_CERT_ID_0,
           checkpoint[2].toString(),
           cc.STATE_ROOT_MAX,
+          cc.TX_ROOT_MAX,
           cc.RECEIPT_ROOT_MAX,
           [cc.TARGET_SUBNET_ID_4],
           cc.VERIFIER,
@@ -175,6 +177,7 @@ describe('ToposCore', () => {
           cc.PREV_CERT_ID_0,
           checkpoint[2].toString(),
           cc.STATE_ROOT_MAX,
+          cc.TX_ROOT_MAX,
           cc.RECEIPT_ROOT_MAX,
           [cc.TARGET_SUBNET_ID_4],
           cc.VERIFIER,
@@ -201,6 +204,7 @@ describe('ToposCore', () => {
         cc.PREV_CERT_ID_0,
         updatedTestCheckpoint[2].toString(),
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         cc.RECEIPT_ROOT_MAX,
         [cc.TARGET_SUBNET_ID_4],
         cc.VERIFIER,
diff --git a/test/topos-core/ToposMessaging.test.ts b/test/topos-core/ToposMessaging.test.ts
index d64f13c..9eac988 100644
--- a/test/topos-core/ToposMessaging.test.ts
+++ b/test/topos-core/ToposMessaging.test.ts
@@ -30,6 +30,7 @@ describe('ToposMessaging', () => {
       cc.PREV_CERT_ID_0,
       cc.SOURCE_SUBNET_ID_1,
       cc.STATE_ROOT_MAX,
+      cc.TX_ROOT_MAX,
       cc.RECEIPT_ROOT_MAX,
       [cc.TARGET_SUBNET_ID_4, cc.TARGET_SUBNET_ID_5],
       cc.VERIFIER,
@@ -261,6 +262,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -333,6 +335,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -373,6 +376,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -403,6 +407,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         txc.INVALID_STATUS_TRANSACTION.receiptRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -446,6 +451,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -481,6 +487,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -503,6 +510,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         txc.UNKNOWN_TOKEN_TRANSACTION.receiptRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -530,6 +538,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         txc.MINT_EXCEED_TRANSACTION.receiptRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -557,6 +566,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         txc.ZERO_ADDRESS_TRANSACTION.receiptRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
@@ -595,6 +605,7 @@ describe('ToposMessaging', () => {
         cc.PREV_CERT_ID_0,
         cc.SOURCE_SUBNET_ID_1,
         cc.STATE_ROOT_MAX,
+        cc.TX_ROOT_MAX,
         receiptsRoot,
         [cc.SOURCE_SUBNET_ID_2],
         cc.VERIFIER,
diff --git a/test/topos-core/shared/constants/certificates.ts b/test/topos-core/shared/constants/certificates.ts
index 9c9ce7d..bb41fad 100644
--- a/test/topos-core/shared/constants/certificates.ts
+++ b/test/topos-core/shared/constants/certificates.ts
@@ -16,6 +16,8 @@ export const DUMMY_STARK_PROOF = ethers.utils.formatBytes32String('starkProof')
 export const DUMMY_SIGNATURE = ethers.utils.formatBytes32String('signature')
 export const PREV_CERT_ID_0 =
   '0x0000000000000000000000000000000000000000000000000000000000000000'
+export const RECEIPT_ROOT_MAX =
+  '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
 export const SOURCE_SUBNET_ID_1 =
   '0x0000000000000000000000000000000000000000000000000000000000000001'
 export const SOURCE_SUBNET_ID_2 =
@@ -30,6 +32,6 @@ export const TARGET_SUBNET_ID_5 =
   '0x0000000000000000000000000000000000000000000000000000000000000005'
 export const TARGET_SUBNET_ID_6 =
   '0x0000000000000000000000000000000000000000000000000000000000000006'
-export const RECEIPT_ROOT_MAX =
+export const TX_ROOT_MAX =
   '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
 export const VERIFIER = 1
diff --git a/test/topos-core/shared/utils/common.ts b/test/topos-core/shared/utils/common.ts
index 7dd37c6..9b16922 100644
--- a/test/topos-core/shared/utils/common.ts
+++ b/test/topos-core/shared/utils/common.ts
@@ -4,6 +4,7 @@ function encodeCertParam(
   prevId: string,
   sourceSubnetId: string,
   stateRoot: string,
+  txRoot: string,
   receiptRoot: string,
   targetSubnets: string[],
   verifier: number,
@@ -17,6 +18,7 @@ function encodeCertParam(
       'bytes32',
       'bytes32',
       'bytes32',
+      'bytes32',
       'bytes32[]',
       'uint32',
       'bytes32',
@@ -27,6 +29,7 @@ function encodeCertParam(
       prevId,
       sourceSubnetId,
       stateRoot,
+      txRoot,
       receiptRoot,
       targetSubnets,
       verifier,