From db4e994921e76840f79deb75c6ce36a929624051 Mon Sep 17 00:00:00 2001
From: Dmitri Zagidulin <dzagidulin@gmail.com>
Date: Wed, 15 Oct 2025 14:58:02 -0400
Subject: [PATCH] Add OBv3 'identifier' property.

Signed-off-by: Dmitri Zagidulin <dzagidulin@gmail.com>
---
 CHANGELOG.md |  4 ++++
 src/OBv3.ts  | 11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6c3b97e..f7c7d65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # ssi Changelog
 
+## 5.2.0 -
+### Added
+- Add `identifier` property to `IOpenBadgeSubject` export.
+
 ## 5.1.0 - 2025-10-10
 ### Added
 - Export `IOpenBadgeCredentialV3` interface.
diff --git a/src/OBv3.ts b/src/OBv3.ts
index 58f72f7..36876ee 100644
--- a/src/OBv3.ts
+++ b/src/OBv3.ts
@@ -7,13 +7,21 @@ import { IVerifiableCredential } from './VCDM.js'
 import { ILdType, ILinkedDataObject } from './LD.js'
 
 /**
- * OBv3 Credential (Assertion)
+ * OBv3 Credential
  * Extends W3C VC with an OBv3-specific credentialSubject
  */
 export interface IOpenBadgeCredentialV3 extends IVerifiableCredential {
   credentialSubject: IOpenBadgeSubject | IOpenBadgeSubject[]
 }
 
+export interface IOBv3IdentityObject {
+  hashed: boolean
+  // @see https://www.imsglobal.org/spec/ob/v3p0/#org.1edtech.ob.v3p0.identifiertypeenum.class
+  identityType?: string | string[]
+  identityHash?: string
+  salt?: string
+}
+
 /**
  * OBv3 CredentialSubject
  * https://www.imsglobal.org/spec/ob/v3p0/#credentialsubject
@@ -21,6 +29,7 @@ export interface IOpenBadgeCredentialV3 extends IVerifiableCredential {
 export interface IOpenBadgeSubject extends ILinkedDataObject {
   achievement: IAchievement | string
   evidence?: IOBv3Evidence | IOBv3Evidence[]
+  identifier?: IOBv3IdentityObject | IOBv3IdentityObject[]
   [x: string]: any
 }