diff --git a/packages/context/src/models/contextIdKeys.ts b/packages/context/src/models/contextIdKeys.ts
index 42ed7153..90376016 100644
--- a/packages/context/src/models/contextIdKeys.ts
+++ b/packages/context/src/models/contextIdKeys.ts
@@ -1,4 +1,5 @@
 // Copyright 2024 IOTA Stiftung.
+// Copyright 2026 3Sixty Trade Ltd.
 // SPDX-License-Identifier: Apache-2.0.
 
 /**
@@ -29,7 +30,13 @@ export const ContextIdKeys = {
 	/**
 	 * Standard property type definition for user organization.
 	 */
-	UserOrganization: "userOrganization"
+	UserOrganization: "userOrganization",
+
+	/**
+	 * Standard property type definition for account, the stable account identifier.
+	 * Unlike `User` this is not a DID.
+	 */
+	Account: "account"
 } as const;
 
 /**
diff --git a/packages/context/tests/helpers/contextIdHelper.spec.ts b/packages/context/tests/helpers/contextIdHelper.spec.ts
index f6c18df7..e1b88aed 100644
--- a/packages/context/tests/helpers/contextIdHelper.spec.ts
+++ b/packages/context/tests/helpers/contextIdHelper.spec.ts
@@ -1,8 +1,10 @@
 // Copyright 2024 IOTA Stiftung.
+// Copyright 2026 3Sixty Trade Ltd.
 // SPDX-License-Identifier: Apache-2.0.
 import { Guards } from "@3sixty/core";
 import { ContextIdHandlerFactory } from "../../src/factories/contextIdHandlerFactory.js";
 import { ContextIdHelper } from "../../src/helpers/contextIdHelper.js";
+import { ContextIdKeys } from "../../src/models/contextIdKeys.js";
 import type { IContextIdHandler } from "../../src/models/IContextIdHandler.js";
 
 /**
@@ -99,6 +101,18 @@ describe("ContextIdHelper", () => {
 		);
 	});
 
+	it("guard accepts an account id when no handler is registered", () => {
+		const ctx = { [ContextIdKeys.Account]: "01932a7e-0000-7000-8000-000000000001" };
+		expect(() => ContextIdHelper.guard(ctx, ContextIdKeys.Account)).not.toThrow();
+	});
+
+	it("guard rejects an empty account id when no handler is registered", () => {
+		const ctx = { [ContextIdKeys.Account]: "" };
+		expect(() => ContextIdHelper.guard(ctx, ContextIdKeys.Account)).toThrow(
+			expect.objectContaining({ name: "GuardError", message: "guard.stringEmpty" })
+		);
+	});
+
 	it("guard delegates to handler and passes", () => {
 		const ctx = { organization: "ORG1234" };
 		expect(() => ContextIdHelper.guard(ctx, "organization")).not.toThrow();