diff --git a/lib/core/versions/latest/Delta.ts b/lib/core/versions/latest/Delta.ts
index 726ef0451..7808c32c7 100644
--- a/lib/core/versions/latest/Delta.ts
+++ b/lib/core/versions/latest/Delta.ts
@@ -1,4 +1,5 @@
 import ErrorCode from './ErrorCode';
+import JsonCanonicalizer from './util/JsonCanonicalizer';
 import ProtocolParameters from './ProtocolParameters';
 import SidetreeError from '../../../common/SidetreeError';
 
@@ -9,6 +10,7 @@ export default class Delta {
 
   /**
    * Validates size of the encoded delta string.
+   * TODO: SIP 2 #781 delete this and use validateDeltaSize only in chunk file
    * @throws `SidetreeError` if fails validation.
    */
   public static validateEncodedDeltaSize (encodedDelta: string) {
@@ -19,4 +21,16 @@ export default class Delta {
       throw new SidetreeError(ErrorCode.DeltaExceedsMaximumSize, errorMessage);
     }
   }
+
+  /**
+   * Validates size of the delta object
+   */
+  public static validateDeltaSize (delta: object) {
+    const size = Buffer.byteLength(JsonCanonicalizer.canonicalizeAsBuffer(delta));
+    if (size > ProtocolParameters.maxDeltaSizeInBytes) {
+      const errorMessage = `${size} bytes of 'delta' exceeded limit of ${ProtocolParameters.maxDeltaSizeInBytes} bytes.`;
+      console.info(errorMessage);
+      throw new SidetreeError(ErrorCode.DeltaExceedsMaximumSize, errorMessage);
+    }
+  }
 }
diff --git a/lib/core/versions/latest/Did.ts b/lib/core/versions/latest/Did.ts
index 30aa31736..f3f3ad8b1 100644
--- a/lib/core/versions/latest/Did.ts
+++ b/lib/core/versions/latest/Did.ts
@@ -178,6 +178,7 @@ export default class Did {
     }
 
     Did.validateInitialState(initialStateEncodedJcs, initialStateObject);
+    Delta.validateDeltaSize(initialStateObject.delta);
 
     const createOperationRequest = {
       type: OperationType.Create,
diff --git a/lib/core/versions/latest/protocol-parameters.json b/lib/core/versions/latest/protocol-parameters.json
index 23259b019..789066d3b 100644
--- a/lib/core/versions/latest/protocol-parameters.json
+++ b/lib/core/versions/latest/protocol-parameters.json
@@ -2,7 +2,7 @@
   "hashAlgorithmInMultihashCode": 18,
   "maxAnchorFileSizeInBytes": 1000000,
   "maxMapFileSizeInBytes": 1000000,
-  "maxChunkFileSizeInBytes": 20000000,
+  "maxChunkFileSizeInBytes": 10000000,
   "maxNumberOfOperationsPerTransactionTime": 600000,
   "maxNumberOfTransactionsPerTransactionTime": 300,
   "maxOperationsPerBatch": 10000,
diff --git a/tests/core/Did.spec.ts b/tests/core/Did.spec.ts
index c36b7f2d7..0368b2c89 100644
--- a/tests/core/Did.spec.ts
+++ b/tests/core/Did.spec.ts
@@ -3,6 +3,7 @@ import Did from '../../lib/core/versions/latest/Did';
 import Encoder from '../../lib/core/versions/latest/Encoder';
 import ErrorCode from '../../lib/core/versions/latest/ErrorCode';
 import JasmineSidetreeErrorValidator from '../JasmineSidetreeErrorValidator';
+import JsonCanonicalizer from '../../lib/core/versions/latest/util/JsonCanonicalizer';
 import OperationGenerator from '../generators/OperationGenerator';
 import SidetreeError from '../../lib/common/SidetreeError';
 
@@ -27,6 +28,14 @@ describe('DID', async () => {
         expect(e).toEqual(new SidetreeError(ErrorCode.DidInitialStateJcsIsNotJcs, 'Initial state object and JCS string mismatch.'));
       }
     });
+
+    it('should throw sidetree error if delta exceeds size limit', () => {
+      const largeData = crypto.randomBytes(2000).toString('hex');// Intentionally exceeding max size.
+      const largeDelta = { data: largeData };
+      const testInitialState = Encoder.encode(JsonCanonicalizer.canonicalizeAsBuffer({ suffix_data: 'some data', delta: largeDelta }));
+
+      JasmineSidetreeErrorValidator.expectSidetreeErrorToBeThrown(() => { Did['constructCreateOperationFromEncodedJcs'](testInitialState); }, ErrorCode.DeltaExceedsMaximumSize);
+    });
   });
 
   describe('create()', async () => {