diff --git a/src/ocean/DID.ts b/src/ocean/DID.ts
index ef3d13f..65f6de9 100644
--- a/src/ocean/DID.ts
+++ b/src/ocean/DID.ts
@@ -14,11 +14,10 @@ export default class DID {
      */
     public static parse(didString: string): DID {
         let did: DID
-        if (didString.startsWith(prefix)) {
-            const id = didString.split(prefix)[1]
-            if (!id.startsWith("0x")) {
-                did = new DID(id)
-            }
+        const didMatch = didString.match(/^did:op:([a-f0-9]{64})$/i)
+
+        if (didMatch) {
+            did = new DID(didMatch[1])
         }
 
         if (!did) {
diff --git a/src/ocean/Ocean.ts b/src/ocean/Ocean.ts
index 5869cc5..c06d592 100644
--- a/src/ocean/Ocean.ts
+++ b/src/ocean/Ocean.ts
@@ -1,4 +1,4 @@
-import deprecated from 'deprecated-decorator';
+import deprecated from "deprecated-decorator"
 
 import AquariusProvider from "../aquarius/AquariusProvider"
 import SearchQuery from "../aquarius/query/SearchQuery"
@@ -82,9 +82,9 @@ export default class Ocean {
      * @param  {string} did Decentralized ID.
      * @return {Promise<DDO>}
      */
-    @deprecated('resolveAssetDID')
+    @deprecated("resolveAssetDID")
     public async resolveDID(did: string): Promise<DDO> {
-        return await this.resolveAssetDID(did);
+        return await this.resolveAssetDID(did)
     }
 
     /**
@@ -201,15 +201,15 @@ export default class Ocean {
      * @param  {string} serviceDefinitionId Service definition ID.
      * @param  {Account} consumer Consumer account.
      * @return {Promise<any>}
-     * 
+     *
      */
-    @deprecated('purchaseAssetService')
+    @deprecated("purchaseAssetService")
     public async signServiceAgreement(
         did: string,
         serviceDefinitionId: string,
         consumer: Account,
     ): Promise<any> {
-        return await this.purchaseAssetService(did, serviceDefinitionId, consumer);
+        return await this.purchaseAssetService(did, serviceDefinitionId, consumer)
     }
 
     /**
@@ -369,7 +369,6 @@ export default class Ocean {
         return AquariusProvider.getAquarius().queryMetadata(query)
     }
 
-
     /**
      * Search over the assets using a keyword.
      * @param  {SearchQuery} text Text to filter the assets.
diff --git a/src/utils/WebServiceConnector.ts b/src/utils/WebServiceConnector.ts
index 8449e17..ae73194 100644
--- a/src/utils/WebServiceConnector.ts
+++ b/src/utils/WebServiceConnector.ts
@@ -1,4 +1,4 @@
-import fetch, { Response, RequestInit, BodyInit } from "node-fetch"
+import fetch, { BodyInit, RequestInit, Response } from "node-fetch"
 
 /**
  * Provides a common interface to web services.
diff --git a/test/ocean/DID.test.ts b/test/ocean/DID.test.ts
index 9fb7bfa..75d98b1 100644
--- a/test/ocean/DID.test.ts
+++ b/test/ocean/DID.test.ts
@@ -13,7 +13,7 @@ describe("DID", () => {
     describe("#parse()", () => {
         it("should parse a valid did", () => {
 
-            const id = "1234"
+            const id = "a".repeat(64)
             const did: DID = DID.parse(`did:op:${id}`)
             assert(did)
 
@@ -33,7 +33,7 @@ describe("DID", () => {
 
         it("should throw if id does not match", (done) => {
 
-            const id = "0x1234"
+            const id = "xyz"
             try {
                 const did: DID = DID.parse(`did:op:${id}`)
                 assert(!did)
@@ -56,7 +56,7 @@ describe("DID", () => {
     describe("#getDid()", () => {
         it("should return only the id part of the did", () => {
 
-            const id = "1234"
+            const id = "a".repeat(64)
             const did: DID = DID.parse(`did:op:${id}`)
             assert(did)