diff --git a/src/infrastructure/TransactionHttp.ts b/src/infrastructure/TransactionHttp.ts
index 33f4b76d03..9351063fbc 100644
--- a/src/infrastructure/TransactionHttp.ts
+++ b/src/infrastructure/TransactionHttp.ts
@@ -22,6 +22,7 @@ import {PublicAccount} from '../model/account/PublicAccount';
 import {CosignatureSignedTransaction} from '../model/transaction/CosignatureSignedTransaction';
 import {Deadline} from '../model/transaction/Deadline';
 import {SignedTransaction} from '../model/transaction/SignedTransaction';
+import { SyncAnnounce } from '../model/transaction/SyncAnnounce';
 import {Transaction} from '../model/transaction/Transaction';
 import {TransactionAnnounceResponse} from '../model/transaction/TransactionAnnounceResponse';
 import {TransactionStatus} from '../model/transaction/TransactionStatus';
@@ -93,7 +94,7 @@ export class TransactionHttp extends Http implements TransactionRepository {
                     transactionStatusDTO.status,
                     transactionStatusDTO.hash,
                     Deadline.createFromDTO(transactionStatusDTO.deadline),
-                    new UInt64(transactionStatusDTO.height));
+                    transactionStatusDTO.height ? new UInt64(transactionStatusDTO.height) : UInt64.fromUint(0));
             }));
     }
 
@@ -115,7 +116,7 @@ export class TransactionHttp extends Http implements TransactionRepository {
                         transactionStatusDTO.status,
                         transactionStatusDTO.hash,
                         Deadline.createFromDTO(transactionStatusDTO.deadline),
-                        new UInt64(transactionStatusDTO.height));
+                        transactionStatusDTO.height ? new UInt64(transactionStatusDTO.height) : UInt64.fromUint(0));
                 });
             }));
     }
@@ -182,27 +183,11 @@ export class TransactionHttp extends Http implements TransactionRepository {
             } else {
                 return CreateTransactionFromDTO(response);
             }
-        }),catchError((err) => {
+        }), catchError((err) => {
             if (err.statusCode === 405) {
                 return observableThrowError('non sync server');
             }
             return observableThrowError(err);
-        }),);
-    }
-}
-
-class SyncAnnounce {
-    constructor(/**
-                 * Transaction serialized data
-                 */
-                public readonly payload: string,
-                /**
-                 * Transaction hash
-                 */
-                public readonly hash: string,
-                /**
-                 * Transaction address
-                 */
-                public readonly address: string) {
+        }));
     }
 }
diff --git a/src/model/model.ts b/src/model/model.ts
index e5c49129e3..dfb6b3e733 100644
--- a/src/model/model.ts
+++ b/src/model/model.ts
@@ -80,6 +80,7 @@ export * from './transaction/RegisterNamespaceTransaction';
 export * from './transaction/SecretLockTransaction';
 export * from './transaction/SecretProofTransaction';
 export * from './transaction/SignedTransaction';
+export * from './transaction/SyncAnnounce';
 export * from './transaction/Transaction';
 export * from './transaction/TransactionAnnounceResponse';
 export * from './transaction/TransactionInfo';
diff --git a/src/model/transaction/SyncAnnounce.ts b/src/model/transaction/SyncAnnounce.ts
new file mode 100644
index 0000000000..5efe2fcfda
--- /dev/null
+++ b/src/model/transaction/SyncAnnounce.ts
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019 NEM
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export class SyncAnnounce {
+    /**
+     * @internal
+     * @param payload
+     * @param hash
+     * @param address
+     */
+    constructor(
+        /**
+         * Transaction serialized data
+         */
+        public readonly payload: string,
+        /**
+         * Transaction hash
+         */
+        public readonly hash: string,
+        /**
+         * Transaction address
+         */
+        public readonly address: string) {
+    }
+}
diff --git a/test/model/UInt64.spec.ts b/test/model/UInt64.spec.ts
index 035d0d43b2..d1c9aed3d0 100644
--- a/test/model/UInt64.spec.ts
+++ b/test/model/UInt64.spec.ts
@@ -73,7 +73,7 @@ describe('Uint64', () => {
         expect(uint64Compact).to.be.equal(51110867862);
     });
 
-    it('should fromUnit throw exception with negative unit value', () => {
+    it('should fromUint throw exception with negative uint value', () => {
         expect(() => {
             UInt64.fromUint(-1);
         }).to.throw(Error, 'Unsigned integer cannot be negative');