diff --git a/contexts/credentials/v2 b/contexts/credentials/v2
index 3c7222afd..9774e121e 100644
--- a/contexts/credentials/v2
+++ b/contexts/credentials/v2
@@ -25,6 +25,9 @@
       "@id": "https://www.iana.org/assignments/jose#x5u",
       "@type": "@id"
     },
+    "iat": {
+      "@id": "https://www.iana.org/assignments/jwt#iat",
+      "@type": "https://www.w3.org/2001/XMLSchema#nonNegativeInteger"
     "cnf": {
       "@id": "https://www.iana.org/assignments/jwt#cnf",
       "@context": {