diff --git a/src/rmrk2.0.0/tools/types.ts b/src/rmrk2.0.0/tools/types.ts
index dc041499..6dcd5e5d 100644
--- a/src/rmrk2.0.0/tools/types.ts
+++ b/src/rmrk2.0.0/tools/types.ts
@@ -55,6 +55,8 @@ export interface Metadata {
   image_data?: string;
   /** @deprecated deprecated in favour of `mediaUri` field */
   animation_url?: string;
+  /* Allow any other arbitrary key value pairs */
+  [key: string]: any;
 }
 
 export type Options = {
diff --git a/src/rmrk2.0.0/tools/validate-metadata.ts b/src/rmrk2.0.0/tools/validate-metadata.ts
index b6320cde..c81b4664 100644
--- a/src/rmrk2.0.0/tools/validate-metadata.ts
+++ b/src/rmrk2.0.0/tools/validate-metadata.ts
@@ -17,10 +17,11 @@ import { OP_TYPES } from "./constants";
 const MetadataStruct = type({
   name: optional(string()),
   description: optional(string()),
+  mediaUri: optional(pattern(string(), new RegExp("^(https?|ipfs)://.*$"))),
+  thumbnailUri: optional(pattern(string(), new RegExp("^(https?|ipfs)://.*$"))),
   image: optional(pattern(string(), new RegExp("^(https?|ipfs)://.*$"))),
-  image_data: optional(string()),
   properties: any(),
-  external_url: optional(pattern(string(), new RegExp("^(https?|ipfs)://.*$"))),
+  externalUri: optional(pattern(string(), new RegExp("^(https?|ipfs)://.*$"))),
 });
 
 export const PropertiesStruct = object({
@@ -108,17 +109,12 @@ export const validateAttributes = (properties?: IProperties) => {
 };
 
 /**
- * Validate Metadata according to OpenSea docs
- * https://docs.opensea.io/docs/metadata-standards
+ * Validate Metadata
  * @param metadata
  */
 export const validateMetadata = (metadata: Metadata) => {
   assert(metadata, MetadataStruct);
 
-  if (!metadata.image) {
-    throw new Error("image is missing");
-  }
-
   validateAttributes(metadata.properties);
   return true;
 };
diff --git a/test/2.0.0/utils/validate-metadata.test.ts b/test/2.0.0/utils/validate-metadata.test.ts
index 515979b8..51a556e9 100644
--- a/test/2.0.0/utils/validate-metadata.test.ts
+++ b/test/2.0.0/utils/validate-metadata.test.ts
@@ -1,5 +1,4 @@
 import { validateMetadata } from "../../../src/rmrk2.0.0/tools/validate-metadata";
-import { NFTMetadata } from "../../../src/rmrk2.0.0/classes/nft";
 import {
   attributesMockBoostNumberValid,
   metadataMockAllValid,
@@ -7,6 +6,7 @@ import {
   metadataMockAllValid4,
   metadataMockAllValid6,
 } from "../mocks/metadata-valid";
+import {Metadata} from "../../../src/rmrk2.0.0";
 
 export const attributesMockDateInvalid = [
   {
@@ -27,25 +27,25 @@ export const metadataMockAllInvalid = {
 describe("validation: validateMetadata with valid mocks", () => {
   it("should be valid", () => {
     expect(() =>
-      validateMetadata(metadataMockAllValid as NFTMetadata)
+      validateMetadata(metadataMockAllValid as Metadata)
     ).not.toThrow();
   });
 
   it("should be valid2", () => {
     expect(() =>
-      validateMetadata(metadataMockAllValid2 as NFTMetadata)
+      validateMetadata(metadataMockAllValid2 as Metadata)
     ).not.toThrow();
   });
 
   it("should be valid4", () => {
     expect(() =>
-      validateMetadata(metadataMockAllValid4 as NFTMetadata)
+      validateMetadata(metadataMockAllValid4 as Metadata)
     ).not.toThrow();
   });
 
   it("should be valid6", () => {
     expect(() =>
-      validateMetadata(metadataMockAllValid6 as NFTMetadata)
+      validateMetadata(metadataMockAllValid6 as Metadata)
     ).not.toThrow();
   });
 });
@@ -54,45 +54,33 @@ describe("validation: validateMetadata with invalid mocks", () => {
   it("should be invalid", () => {
     expect(() =>
       validateMetadata({
-        image: "file://dfsdf",
-      } as NFTMetadata)
+        mediaUri: "file://dfsdf",
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
       validateMetadata({
         name: 1,
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
       validateMetadata({
         description: 1,
-      } as NFTMetadata)
-    ).toThrow();
-
-    expect(() =>
-      validateMetadata({
-        background_color: 1,
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
       validateMetadata({
         image: 1,
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
-    expect(() =>
-      validateMetadata({
-        name: "Mock",
-      } as NFTMetadata)
-    ).toThrow();
-    
     expect(() =>
       validateMetadata({
         image: "ipfs://dfsdf",
-        external_url: "Mock",
-      } as NFTMetadata)
+        externalUri: "Mock",
+      } as Metadata)
     ).toThrow();
   });
 
@@ -101,7 +89,7 @@ describe("validation: validateMetadata with invalid mocks", () => {
       validateMetadata({
         image: "ipfs://dfsdf",
         properties: { test: { value: 123, type: "string" } },
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
@@ -113,7 +101,7 @@ describe("validation: validateMetadata with invalid mocks", () => {
             value: "123",
           },
         },
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
@@ -125,7 +113,7 @@ describe("validation: validateMetadata with invalid mocks", () => {
             value: 123,
           },
         },
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
 
     expect(() =>
@@ -137,7 +125,7 @@ describe("validation: validateMetadata with invalid mocks", () => {
             value: 123,
           },
         },
-      } as NFTMetadata)
+      } as Metadata)
     ).toBeTruthy();
 
     expect(() =>
@@ -149,7 +137,7 @@ describe("validation: validateMetadata with invalid mocks", () => {
             value: "123",
           },
         },
-      } as NFTMetadata)
+      } as Metadata)
     ).toThrow();
   });
 });