diff --git a/agentscore_commerce/identity/ucp.py b/agentscore_commerce/identity/ucp.py
index a9566d8..b3cedd1 100644
--- a/agentscore_commerce/identity/ucp.py
+++ b/agentscore_commerce/identity/ucp.py
@@ -23,7 +23,7 @@
 if TYPE_CHECKING:
     from agentscore_commerce.identity.types import AssessResult
 
-_DEFAULT_VERSION = "2026-04-17"
+_DEFAULT_VERSION = "2026-04-08"
 
 # Reverse-DNS namespacing per UCP convention. The bare ``agentscore-identity`` form
 # fails the spec regex; vendor-namespacing under the ``sh.agentscore`` authority is
diff --git a/pyproject.toml b/pyproject.toml
index 0140f83..69558c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentscore-commerce"
-version = "1.5.0"
+version = "1.5.1"
 description = "Agent commerce SDK for Python — identity middleware (FastAPI, Flask, Django, AIOHTTP, Sanic, ASGI) + payment helpers + 402 builders + discovery + Stripe multichain. The full merchant-side toolkit for AgentScore-powered agent commerce."
 readme = "README.md"
 license = "MIT"
diff --git a/tests/fixtures/cross-lang/node-capability.json b/tests/fixtures/cross-lang/node-capability.json
index a06e437..b7eeed7 100644
--- a/tests/fixtures/cross-lang/node-capability.json
+++ b/tests/fixtures/cross-lang/node-capability.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,10 +46,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "IuEDuQu_5--c_GVEaY4x0xjGbKro965U5VGyRY8TxpI"
+        "x": "X2stNKskrWqDT_5KngcAN-RkUu-Ieya3USNRHr6lqPc"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtY2FwYWJpbGl0eS1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.s36lpaOS-eGdTC0agCpLU_JxDLNO6nM5YjOTxJb6JoYVYzWBaflJCkWxwN6bDgdgDh-lPSY7_l7X0636TjpzCA"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtY2FwYWJpbGl0eS1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.ZGG687JXm2o7NMLsdAi8recA0hYf3wQrmNfa7HAnZh3xowZ2w93DjMKft3RPNSF8ZMicxggyqezskbVMPzPkDQ"
   },
   "jwks": {
     "keys": [
@@ -59,7 +59,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "IuEDuQu_5--c_GVEaY4x0xjGbKro965U5VGyRY8TxpI"
+        "x": "X2stNKskrWqDT_5KngcAN-RkUu-Ieya3USNRHr6lqPc"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-data-driven-claims.json b/tests/fixtures/cross-lang/node-data-driven-claims.json
index c59119e..271de0c 100644
--- a/tests/fixtures/cross-lang/node-data-driven-claims.json
+++ b/tests/fixtures/cross-lang/node-data-driven-claims.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,10 +46,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "t9ul3BiA3r0fugZcbcEcyARb8SAH_-4dalE3sjaVMKc"
+        "x": "Ex__9-UJq57zdUnDjihuTriMCT66Mxp8AlhmPXhxnAw"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZGF0YS1kcml2ZW4tY2xhaW1zLUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.8MSGbttC6ITB1vEYr0Wq8kSRniYAV25gMT7jahMGKIJfcE-rBGTukPFpXzpBWUNkSWOW4ihkOvTA5Wxws4NjDA"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZGF0YS1kcml2ZW4tY2xhaW1zLUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.9H0tKbXw99RsDCZXhBZ1ug0StgArOL07Ue-yc4IdJtKmXsoHBaO2bfo2ygVyGz3XK2TQtGvrA4N9wmSdky9MCQ"
   },
   "jwks": {
     "keys": [
@@ -59,7 +59,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "t9ul3BiA3r0fugZcbcEcyARb8SAH_-4dalE3sjaVMKc"
+        "x": "Ex__9-UJq57zdUnDjihuTriMCT66Mxp8AlhmPXhxnAw"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-emoji-keys.json b/tests/fixtures/cross-lang/node-emoji-keys.json
index ca325f0..0cc8427 100644
--- a/tests/fixtures/cross-lang/node-emoji-keys.json
+++ b/tests/fixtures/cross-lang/node-emoji-keys.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -33,14 +33,14 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "O5o3d9qQsgo-eDXV9rnt-saHwzpiitL4kTcVxGr6mjE"
+        "x": "eW7hE4Mqxlub3PeI4yBjv4gY3om8ld1OIcYSCwTafV8"
       }
     ],
     "a": 1,
     "豈": 2,
     "": 3,
     "🍷": 4,
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZW1vamkta2V5cy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.a-34-eGa5zJtMxXiefamLIcm4UM_Wix1XpHcJRXcM8Fs1Lx3ErLxLl-pdgyveDP1DVel7FmaSXJJuANSRvB4Bw"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZW1vamkta2V5cy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.zG0olreIhuT-2zPs2UEcXaKS5ixqpOCpA65GouZvlpcq7O81zst6nJEL7ZxCT4Up-Mk9ZPv2M3nkcO3u7QB-DA"
   },
   "jwks": {
     "keys": [
@@ -50,7 +50,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "O5o3d9qQsgo-eDXV9rnt-saHwzpiitL4kTcVxGr6mjE"
+        "x": "eW7hE4Mqxlub3PeI4yBjv4gY3om8ld1OIcYSCwTafV8"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-es256-rails.json b/tests/fixtures/cross-lang/node-es256-rails.json
index c8bd844..ef430ed 100644
--- a/tests/fixtures/cross-lang/node-es256-rails.json
+++ b/tests/fixtures/cross-lang/node-es256-rails.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -56,11 +56,11 @@
         "use": "sig",
         "crv": "P-256",
         "kty": "EC",
-        "x": "YJlpUMxCjw_uFVaklMcPBroRAAyWRFBb6hogNbBzwqc",
-        "y": "RPRH4k6hBTqEX0-Wf9s2y3VAFcwtYDnZz53Y-3G-Vl8"
+        "x": "lLlT6hqlccYtAYP4l5tVP9jDETRSocwEh_Z1EEDbjA4",
+        "y": "IHrRW8GTsA5Jib53LG5B28i9t6PX5nvr86uZrdhhfH0"
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     ],
-    "signature": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im5vZGUtZXMyNTYtcmFpbHMtRVMyNTYiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.lhet7Dek3XSboG8lxyoGEc4-6kEQqwkxXbR2qqKGdKlB4aoXmHrN0hpQZSzzfqKpjwN_I7VgZiKZOteTqhKrMQ"
+    "signature": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im5vZGUtZXMyNTYtcmFpbHMtRVMyNTYiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.mYvpnIyTko3x80Yhza-iqIT-ifeVj6qwAkOy3sHeOk-GmOp4hTfyNLgS4NVhfHr-vyYeJcqHyXfGMLhH5GRXyw"
   },
   "jwks": {
     "keys": [
@@ -70,8 +70,8 @@
         "use": "sig",
         "crv": "P-256",
         "kty": "EC",
-        "x": "YJlpUMxCjw_uFVaklMcPBroRAAyWRFBb6hogNbBzwqc",
-        "y": "RPRH4k6hBTqEX0-Wf9s2y3VAFcwtYDnZz53Y-3G-Vl8"
+        "x": "lLlT6hqlccYtAYP4l5tVP9jDETRSocwEh_Z1EEDbjA4",
+        "y": "IHrRW8GTsA5Jib53LG5B28i9t6PX5nvr86uZrdhhfH0"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-extras-int.json b/tests/fixtures/cross-lang/node-extras-int.json
index 60f17ec..77370e8 100644
--- a/tests/fixtures/cross-lang/node-extras-int.json
+++ b/tests/fixtures/cross-lang/node-extras-int.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -37,10 +37,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "LwGeYhxjsedo9kllWo8uRdHZnf9teSPjEGLJrhF9o0M"
+        "x": "6oWh70ciinshT6hYc8F3bi-LDe2k4awOGxh8Zgvm6_0"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZXh0cmFzLWludC1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.s6sBki-bBhRuZNZiv7s7NO3NpLDfhoXhZXKcK2uitVGiBh9nANv-pi8L-nAIBte8jN_DFoeqtWQJiAK188XqBg"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtZXh0cmFzLWludC1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.MH9yEhoofwGP55zpFAxxdVVX8UJOI5rj5Y-kEOSAyR-regztzdgLJLL2U7DG2OyAX-K08j_2oHyAWwI9hfMCBw"
   },
   "jwks": {
     "keys": [
@@ -50,7 +50,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "LwGeYhxjsedo9kllWo8uRdHZnf9teSPjEGLJrhF9o0M"
+        "x": "6oWh70ciinshT6hYc8F3bi-LDe2k4awOGxh8Zgvm6_0"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-int-boundary.json b/tests/fixtures/cross-lang/node-int-boundary.json
index 74dd819..dea80f9 100644
--- a/tests/fixtures/cross-lang/node-int-boundary.json
+++ b/tests/fixtures/cross-lang/node-int-boundary.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -24,7 +24,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "vmNTcQKo5jUIpTVnWRSkLu-s7cUoNO_OfPJTctAOhR4"
+        "x": "tqMB9yg0wzxt7RAbYRh9G2zJttQYEl1StI-ZUH-TfT4"
       }
     ],
     "max_safe_int": 9007199254740991,
@@ -32,7 +32,7 @@
     "small_int": 42,
     "neg_small_int": -42,
     "zero": 0,
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtaW50LWJvdW5kYXJ5LUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.eyJtYXhfc2FmZV9pbnQiOjkwMDcxOTkyNTQ3NDA5OTEsIm1pbl9zYWZlX2ludCI6LTkwMDcxOTkyNTQ3NDA5OTEsIm5lZ19zbWFsbF9pbnQiOi00Miwic2lnbmluZ19rZXlzIjpbeyJhbGciOiJFZERTQSIsImNydiI6IkVkMjU1MTkiLCJraWQiOiJub2RlLWludC1ib3VuZGFyeS1FZERTQSIsImt0eSI6Ik9LUCIsInVzZSI6InNpZyIsIngiOiJ2bU5UY1FLbzVqVUlwVFZuV1JTa0x1LXM3Y1VvTk9fT2ZQSlRjdEFPaFI0In1dLCJzbWFsbF9pbnQiOjQyLCJ1Y3AiOnsiY2FwYWJpbGl0aWVzIjp7fSwibmFtZSI6IkludCBCb3VuZGFyeSBNZXJjaGFudCIsInBheW1lbnRfaGFuZGxlcnMiOnt9LCJzZXJ2aWNlcyI6eyJkZXYudWNwLnNob3BwaW5nIjpbeyJlbmRwb2ludCI6Imh0dHBzOi8vaS5leGFtcGxlLmNvbS9hcGkvdWNwL21jcCIsInNjaGVtYSI6Imh0dHBzOi8vdWNwLmRldi9zZXJ2aWNlcy9zaG9wcGluZy9vcGVucnBjLmpzb24iLCJzcGVjIjoiaHR0cHM6Ly91Y3AuZGV2LzIwMjYtMDQtMDgvc3BlY2lmaWNhdGlvbi9vdmVydmlldyIsInRyYW5zcG9ydCI6Im1jcCIsInZlcnNpb24iOiIyMDI2LTA0LTA4In1dfSwidmVyc2lvbiI6IjIwMjYtMDQtMTcifSwiemVybyI6MH0.iIsGfdlC2ZqMh3ouvz86u4QmGS0d-JR9KyTcUNoMTnqbt0P63PBJ7lXCoZ64DY4XtFJ83sPzSrOIzvdsbrOvBQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtaW50LWJvdW5kYXJ5LUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.WUAFP4QuWfMtg1oNb3umalpIk8TgA3gZRR61ZeY6i3lhH2QoiaiCoD_i-ZuUX0VacPKROmNPHB7M2P2YEhMMDA"
   },
   "jwks": {
     "keys": [
@@ -42,7 +42,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "vmNTcQKo5jUIpTVnWRSkLu-s7cUoNO_OfPJTctAOhR4"
+        "x": "tqMB9yg0wzxt7RAbYRh9G2zJttQYEl1StI-ZUH-TfT4"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-minimal.json b/tests/fixtures/cross-lang/node-minimal.json
index 32eef05..1480878 100644
--- a/tests/fixtures/cross-lang/node-minimal.json
+++ b/tests/fixtures/cross-lang/node-minimal.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -24,10 +24,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "69RWgrarCEN0sSH5FfkJ2-miQQNRpXYh0wt9kviqzqk"
+        "x": "4k9JLt7VYeohDntkv9QWirs8S0rCcY9GRqlo6Q-Om_w"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtbWluaW1hbC1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.ei7hxM6v-gnxAkgG4NiWLwzhd9wOxg3lO9ZTFVEuSBaAho0n_GaQayO99ibjQgqa2yUa1J9PcGh3woMh7cQcAA"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtbWluaW1hbC1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.oaltgn7J8k5mMmcJJDKgO3hFFcuwfmWMtQIjOdqqPLoASC23xEycv7Rxl0Kw8V4Uv-GdRWMZRkZFbEt1lR9XBw"
   },
   "jwks": {
     "keys": [
@@ -37,7 +37,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "69RWgrarCEN0sSH5FfkJ2-miQQNRpXYh0wt9kviqzqk"
+        "x": "4k9JLt7VYeohDntkv9QWirs8S0rCcY9GRqlo6Q-Om_w"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-multikey.json b/tests/fixtures/cross-lang/node-multikey.json
index 5027299..dbf18a3 100644
--- a/tests/fixtures/cross-lang/node-multikey.json
+++ b/tests/fixtures/cross-lang/node-multikey.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -36,7 +36,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "dh_cI_8_Z79h3t5i72fKw89EwpeJiA2ELN1SnS_OgdQ"
+        "x": "uM5kVUnQNr3wjoJZsZfH_UHvr8eyZ3HkPU8c_byxSkE"
       },
       {
         "kid": "node-multikey-new",
@@ -44,10 +44,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "oxGfu9h6LckqvQ0eVkovSzUwCdGo8xLkPcq8siUoh7M"
+        "x": "m4yC2wCUwJp4fW9paM1X5WD5BkxrncIQ59FAzD7BE_Q"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtbXVsdGlrZXktbmV3IiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.fEq5VVrBtuwEYJGcpHuaTCVQWmS6LvcOdtS-reZGyLFosCrmok9eU86w9m79aO6k0u_CXOC_n90TvbFfuKINCA"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtbXVsdGlrZXktbmV3IiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.iV40cWm797CZZ-8l8nwkj0hIlNGl4pkC5THFHhSeCrtzCAeRTGgAH2j2dz4u8VF3ig6Fgih1_HzB0cY9lGSIBA"
   },
   "jwks": {
     "keys": [
@@ -57,7 +57,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "dh_cI_8_Z79h3t5i72fKw89EwpeJiA2ELN1SnS_OgdQ"
+        "x": "uM5kVUnQNr3wjoJZsZfH_UHvr8eyZ3HkPU8c_byxSkE"
       },
       {
         "kid": "node-multikey-new",
@@ -65,7 +65,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "oxGfu9h6LckqvQ0eVkovSzUwCdGo8xLkPcq8siUoh7M"
+        "x": "m4yC2wCUwJp4fW9paM1X5WD5BkxrncIQ59FAzD7BE_Q"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-typed-claims.json b/tests/fixtures/cross-lang/node-typed-claims.json
index d754f4c..0694918 100644
--- a/tests/fixtures/cross-lang/node-typed-claims.json
+++ b/tests/fixtures/cross-lang/node-typed-claims.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,10 +46,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "6JcesuEfiy104P6W8zOsruWkL7Ju7RLXMyR2F3fQ4xM"
+        "x": "wQljNPuL3yoY1Kc1wavS5rlR5R_3FyakZ2dg1R9H5kw"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtdHlwZWQtY2xhaW1zLUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.MzebNr-eOGPHe84z8ARhjFHmSLju7AvwgsSu4KY_tmg5R_T6xYrx7tZXbYOCfiSaZoFmpIJcXPakit4c-yxMAA"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtdHlwZWQtY2xhaW1zLUVkRFNBIiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.LMMkHYIobuopLGaOx6qvD9cD8bBgqllhZs-oE0vlF3BCLPfhNScs9JAsMNcpQerSET0V488mdyy-gPdeEuIuCA"
   },
   "jwks": {
     "keys": [
@@ -59,7 +59,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "6JcesuEfiy104P6W8zOsruWkL7Ju7RLXMyR2F3fQ4xM"
+        "x": "wQljNPuL3yoY1Kc1wavS5rlR5R_3FyakZ2dg1R9H5kw"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/node-unicode.json b/tests/fixtures/cross-lang/node-unicode.json
index 89fb48b..7ace95d 100644
--- a/tests/fixtures/cross-lang/node-unicode.json
+++ b/tests/fixtures/cross-lang/node-unicode.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -36,10 +36,10 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "At1k1YXploco8YrjdagqC9HYxCnN7ommm4MWIRUp5AY"
+        "x": "5ZjZBll_HGMmMX97BLrmhMNDzjiWeRUIOG9iWFSMxKI"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtdW5pY29kZS1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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-aXpeacrC5leGFtcGxlLmNvbS9hcGkvdWNwL21jcCIsInNjaGVtYSI6Imh0dHBzOi8vdWNwLmRldi9zZXJ2aWNlcy9zaG9wcGluZy9vcGVucnBjLmpzb24iLCJzcGVjIjoiaHR0cHM6Ly91Y3AuZGV2LzIwMjYtMDQtMDgvc3BlY2lmaWNhdGlvbi9vdmVydmlldyIsInRyYW5zcG9ydCI6Im1jcCIsInZlcnNpb24iOiIyMDI2LTA0LTA4In1dfSwidmVyc2lvbiI6IjIwMjYtMDQtMTcifX0.BKhv1J0LSZ-PQBySoMQXTAx-OalhQZSiiCXaWSHjA6HbeCvz4aw-os3p-FlAgfDoiChxRKeGfN-n-LcYIv4yAQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6Im5vZGUtdW5pY29kZS1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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-aXpeacrC5leGFtcGxlLmNvbS9hcGkvdWNwL21jcCIsInNjaGVtYSI6Imh0dHBzOi8vdWNwLmRldi9zZXJ2aWNlcy9zaG9wcGluZy9vcGVucnBjLmpzb24iLCJzcGVjIjoiaHR0cHM6Ly91Y3AuZGV2LzIwMjYtMDQtMDgvc3BlY2lmaWNhdGlvbi9vdmVydmlldyIsInRyYW5zcG9ydCI6Im1jcCIsInZlcnNpb24iOiIyMDI2LTA0LTA4In1dfSwidmVyc2lvbiI6IjIwMjYtMDQtMDgifX0.vhSNv0jA-cUXMKVdrUJSlrAaHAX8Xvt-7gTVFi4vo9kN4cS1D8QgBw0gOoDOtdRm0_ln0HWAGxK9qB0oKAx5Cg"
   },
   "jwks": {
     "keys": [
@@ -49,7 +49,7 @@
         "use": "sig",
         "crv": "Ed25519",
         "kty": "OKP",
-        "x": "At1k1YXploco8YrjdagqC9HYxCnN7ommm4MWIRUp5AY"
+        "x": "5ZjZBll_HGMmMX97BLrmhMNDzjiWeRUIOG9iWFSMxKI"
       }
     ]
   },
diff --git a/tests/fixtures/cross-lang/py-capability.json b/tests/fixtures/cross-lang/py-capability.json
index af06dd8..cc04e06 100644
--- a/tests/fixtures/cross-lang/py-capability.json
+++ b/tests/fixtures/cross-lang/py-capability.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,16 +46,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "TikhC4jSghoLfPC6j9KBytlHrgyFvZVVm5OUjG7bYCM"
+        "x": "ooweB0iqaf1pSzkXqgfeXeAMZKrpbN7F8Ny_Nw14kBY"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWNhcGFiaWxpdHktRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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._31-NgZEBmN2c8qyxQvOaEBrhycJ6MULjhfN3sgVp5UqiUduGp66XHQC0HI4Ni6W7CzNx2-ktZWdLWD0clPdDg"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWNhcGFiaWxpdHktRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.s9dfG-oFBGFonZaPCBJy6qRQqzz8n38UR5hJYKILeTO2A9rZAtRD6r0a34AdmOSMSY0VFnWt99bB-SGBzw10Bg"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "TikhC4jSghoLfPC6j9KBytlHrgyFvZVVm5OUjG7bYCM",
+        "x": "ooweB0iqaf1pSzkXqgfeXeAMZKrpbN7F8Ny_Nw14kBY",
         "kid": "py-capability-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-data-driven-claims.json b/tests/fixtures/cross-lang/py-data-driven-claims.json
index 5e3bb79..c04890a 100644
--- a/tests/fixtures/cross-lang/py-data-driven-claims.json
+++ b/tests/fixtures/cross-lang/py-data-driven-claims.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,16 +46,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "g_RzTBbrZ0krF4_f4Rtm__flo_1RH2sxiTF9dLltpC8"
+        "x": "UjY11Kj26MtyD01uljIaDpiaMTCK2UT_f6QdlwAmHC0"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWRhdGEtZHJpdmVuLWNsYWltcy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.X7Xdu_60_sT2XpwD9SqF7Lpuf5OGlbG_t_sxaY1xf7rQID5fSR-4BEdB0Dppq04nuaedhcqGUeyTMZDfHe8YDQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWRhdGEtZHJpdmVuLWNsYWltcy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.09ZeEA6nYBxLtmqnyO0SnXLpFiy_78xHgKKLQT1nqXmmZBTUcoOviu1pzF-PS8XTQincVlfo7jXYPbBaNZCMBQ"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "g_RzTBbrZ0krF4_f4Rtm__flo_1RH2sxiTF9dLltpC8",
+        "x": "UjY11Kj26MtyD01uljIaDpiaMTCK2UT_f6QdlwAmHC0",
         "kid": "py-data-driven-claims-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-emoji-keys.json b/tests/fixtures/cross-lang/py-emoji-keys.json
index 209540d..2b74a11 100644
--- a/tests/fixtures/cross-lang/py-emoji-keys.json
+++ b/tests/fixtures/cross-lang/py-emoji-keys.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -33,20 +33,20 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "t9o2BRiSJvI4c7a3KlzCqzKS1evXIyngTwB2GBxtZec"
+        "x": "uPJGnZ8E9RNspNvKtNtxZxqZRUqPDZFeLOeuyhauf-A"
       }
     ],
     "a": 1,
     "豈": 2,
     "": 3,
     "🍷": 4,
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   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "t9o2BRiSJvI4c7a3KlzCqzKS1evXIyngTwB2GBxtZec",
+        "x": "uPJGnZ8E9RNspNvKtNtxZxqZRUqPDZFeLOeuyhauf-A",
         "kid": "py-emoji-keys-EdDSA",
         "alg": "EdDSA",
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diff --git a/tests/fixtures/cross-lang/py-es256-rails.json b/tests/fixtures/cross-lang/py-es256-rails.json
index 4c9ffa9..ff3125f 100644
--- a/tests/fixtures/cross-lang/py-es256-rails.json
+++ b/tests/fixtures/cross-lang/py-es256-rails.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -56,18 +56,18 @@
         "alg": "ES256",
         "use": "sig",
         "crv": "P-256",
-        "x": "NFS5qrSPV5sDQ5hHVag2zFqOSpTO6NBL-Hqf9EjBOco",
-        "y": "wtbEwX6TxEFid1IJvIwxkVfNic3Q_xEOq7j54Kje7aY"
+        "x": "C3ZfMpkic5bJf8t1HREJMrW_46yq7oG4pTelrXa6BTs",
+        "y": "GpQcHSIQaLCNBpMl7CeGxEpGtu50zYKGiaZUSaKUbtQ"
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-    "signature": "eyJhbGciOiJFUzI1NiIsImtpZCI6InB5LWVzMjU2LXJhaWxzLUVTMjU2IiwidHlwIjoiYWdlbnRzY29yZS1wcm9maWxlK2p3cyJ9.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.Vo7XPWeW37oSI5Eub7oUVwb3ODY3g70PeNgYLODGQ9L2nrf-5K7yinG2QwHEh5GtIMq7fXp5fiQVk1KtFnL4Wg"
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   },
   "jwks": {
     "keys": [
       {
         "crv": "P-256",
-        "x": "NFS5qrSPV5sDQ5hHVag2zFqOSpTO6NBL-Hqf9EjBOco",
-        "y": "wtbEwX6TxEFid1IJvIwxkVfNic3Q_xEOq7j54Kje7aY",
+        "x": "C3ZfMpkic5bJf8t1HREJMrW_46yq7oG4pTelrXa6BTs",
+        "y": "GpQcHSIQaLCNBpMl7CeGxEpGtu50zYKGiaZUSaKUbtQ",
         "kid": "py-es256-rails-ES256",
         "alg": "ES256",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-extras-int.json b/tests/fixtures/cross-lang/py-extras-int.json
index f1380bd..fdc25db 100644
--- a/tests/fixtures/cross-lang/py-extras-int.json
+++ b/tests/fixtures/cross-lang/py-extras-int.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -37,16 +37,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "El2ke55St-sfq6gYs6wYJyJX7TIw3-spyA1hlMiNhpM"
+        "x": "68yvy7SRtwNF91vk7bJwCfZF0llVVD6fNP4d7X4Zk5I"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWV4dHJhcy1pbnQtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.0DAtQpZ-9e8U3cmpzTHwWFZq2LmmchY6mz-rhRxybkNX4YDlqpPLcfAig7ybMzdo_O7afJ9QDNYfDERmCGtVDQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LWV4dHJhcy1pbnQtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.MKHlKWBvkWZK_2USAzWyuAS6jtz8EAUSqlhNr1pQR5n39njsoT98EjPXr9EF0YidkH6i12OCFv88GoI0gKE_Dg"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "El2ke55St-sfq6gYs6wYJyJX7TIw3-spyA1hlMiNhpM",
+        "x": "68yvy7SRtwNF91vk7bJwCfZF0llVVD6fNP4d7X4Zk5I",
         "kid": "py-extras-int-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-int-boundary.json b/tests/fixtures/cross-lang/py-int-boundary.json
index 9c91acc..dabf87f 100644
--- a/tests/fixtures/cross-lang/py-int-boundary.json
+++ b/tests/fixtures/cross-lang/py-int-boundary.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -24,7 +24,7 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "b5OlULxsP0xpS8IkLF4tRaiB1u6yODPxsQJJYv1iB6s"
+        "x": "0afNQAp3MfPjli1PWg6-iYAjoNnESv96e5bJ8irRcD0"
       }
     ],
     "max_safe_int": 9007199254740991,
@@ -32,13 +32,13 @@
     "small_int": 42,
     "neg_small_int": -42,
     "zero": 0,
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   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "b5OlULxsP0xpS8IkLF4tRaiB1u6yODPxsQJJYv1iB6s",
+        "x": "0afNQAp3MfPjli1PWg6-iYAjoNnESv96e5bJ8irRcD0",
         "kid": "py-int-boundary-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-minimal.json b/tests/fixtures/cross-lang/py-minimal.json
index 0e83bfc..19d9ed6 100644
--- a/tests/fixtures/cross-lang/py-minimal.json
+++ b/tests/fixtures/cross-lang/py-minimal.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -24,16 +24,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "dZ6PLK4BfgrHTuRA0klbkcl6iHAXhyX3ACjRefxb8IA"
+        "x": "metZlz1oZFmvRiVvfL3ajCVdWy_-RK2PerjKSsgviLg"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LW1pbmltYWwtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.axue3k1ojtSWw0pZJbuDmx-HBt6DZTwtbD3DiHKwrrP3YSWjdlp_FBfBMT0jA-oQ6HqfdQ4fO9vuRAAIpBepCw"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LW1pbmltYWwtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.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.z76YEZSH1zGeNTXVzbH8gP1Rzer8LpeFtDhrSCSn-wV8eWc135f9BrfEEYQGaEqiYzNlPIynfA1-iVQLqzOJDw"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "dZ6PLK4BfgrHTuRA0klbkcl6iHAXhyX3ACjRefxb8IA",
+        "x": "metZlz1oZFmvRiVvfL3ajCVdWy_-RK2PerjKSsgviLg",
         "kid": "py-minimal-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-multikey.json b/tests/fixtures/cross-lang/py-multikey.json
index 514eaba..c0a3f70 100644
--- a/tests/fixtures/cross-lang/py-multikey.json
+++ b/tests/fixtures/cross-lang/py-multikey.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -36,7 +36,7 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "lW7nqnsPzl7FVllMcMjTSHmAqaMVeBMJk4mEwgfY5Vo"
+        "x": "VvkX3wnJHn26gnTmWF8GRFlVH_iaMNLAaieBn-5ovEU"
       },
       {
         "kid": "py-multikey-new",
@@ -44,16 +44,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "Kmwcte5hHWi17aQjekr9Zdw6fsBQl237_jllIAJBMnk"
+        "x": "jA1y92GEbvAeS1OZJPyr7HYpGu2FwQjoo22M_TzorcA"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LW11bHRpa2V5LW5ldyIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.gBimQYPBcvQFutbEzKeJrLzjrkgqyClkbRuSVOaRAfzAvUsxZ5Zse1WmqhadHzv5DUZohfBiWUHjj96kToOPDQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LW11bHRpa2V5LW5ldyIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.kUnGFkqkSj0iCX2cxIoh99qtvtklfUGaWeuxoX7Y3v1C2bNsB1EDNB-u0ZDPIn44O4FJy-aUxX3jAVhqhQADAg"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "lW7nqnsPzl7FVllMcMjTSHmAqaMVeBMJk4mEwgfY5Vo",
+        "x": "VvkX3wnJHn26gnTmWF8GRFlVH_iaMNLAaieBn-5ovEU",
         "kid": "py-multikey-old",
         "alg": "EdDSA",
         "use": "sig",
@@ -61,7 +61,7 @@
       },
       {
         "crv": "Ed25519",
-        "x": "Kmwcte5hHWi17aQjekr9Zdw6fsBQl237_jllIAJBMnk",
+        "x": "jA1y92GEbvAeS1OZJPyr7HYpGu2FwQjoo22M_TzorcA",
         "kid": "py-multikey-new",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-typed-claims.json b/tests/fixtures/cross-lang/py-typed-claims.json
index a486c17..396bf54 100644
--- a/tests/fixtures/cross-lang/py-typed-claims.json
+++ b/tests/fixtures/cross-lang/py-typed-claims.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -46,16 +46,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "clSTIoRWvV4whYX40RYSSPGfcj2mL3YW-IkgYYM6SLQ"
+        "x": "yjdkLTwZHaA2QJ8QK6dZ-TXj3b2vKWGxd5Wn8jXaP2I"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LXR5cGVkLWNsYWltcy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.0BQic1wyTNOk4TVcs2dJ6iRARokGtSjzMzbP9myAlMdF8zpnXfWAzZ6MwUsmH10eK7PQtRrj5D-St4_xxw6SBw"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LXR5cGVkLWNsYWltcy1FZERTQSIsInR5cCI6ImFnZW50c2NvcmUtcHJvZmlsZStqd3MifQ.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.dEad_hdel2vcUDbqf2dwq_VXtQvk71Fo-RJHfoE0z8cUWNAktZudAxbxKpOAIXgPwlnG1jh2m6mo7IpSiLuuBw"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "clSTIoRWvV4whYX40RYSSPGfcj2mL3YW-IkgYYM6SLQ",
+        "x": "yjdkLTwZHaA2QJ8QK6dZ-TXj3b2vKWGxd5Wn8jXaP2I",
         "kid": "py-typed-claims-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/fixtures/cross-lang/py-unicode.json b/tests/fixtures/cross-lang/py-unicode.json
index 8d27413..7ae8586 100644
--- a/tests/fixtures/cross-lang/py-unicode.json
+++ b/tests/fixtures/cross-lang/py-unicode.json
@@ -1,7 +1,7 @@
 {
   "profile": {
     "ucp": {
-      "version": "2026-04-17",
+      "version": "2026-04-08",
       "services": {
         "dev.ucp.shopping": [
           {
@@ -36,16 +36,16 @@
         "alg": "EdDSA",
         "use": "sig",
         "crv": "Ed25519",
-        "x": "Rk_x9yyAht9Xy_mKxxmdh0kyr12andlLUGHY2xh8-3w"
+        "x": "2yFUhSLrMIm1yc59Gg7xtDo89yYDXEptKkzh7jQyj6A"
       }
     ],
-    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LXVuaWNvZGUtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.eyJzaWduaW5nX2tleXMiOlt7ImFsZyI6IkVkRFNBIiwiY3J2IjoiRWQyNTUxOSIsImtpZCI6InB5LXVuaWNvZGUtRWREU0EiLCJrdHkiOiJPS1AiLCJ1c2UiOiJzaWciLCJ4IjoiUmtfeDl5eUFodDlYeV9tS3h4bWRoMGt5cjEyYW5kbExVR0hZMnhoOC0zdyJ9XSwidWNwIjp7ImNhcGFiaWxpdGllcyI6e30sIm5hbWUiOiJDYWbDqSDml6XmnKwg8J-NtyBNZXJjaGFudCIsInBheW1lbnRfaGFuZGxlcnMiOnsic2guYWdlbnRzY29yZS5wYXltZW50LnRlbXBvIjpbeyJjb25maWciOnsibm90ZSI6IuODoeODoiJ9LCJpZCI6InRlbXBvIiwic2NoZW1hIjoiaHR0cHM6Ly9hZ2VudHNjb3JlLnNoL3NjaGVtYXMvcGF5bWVudC1oYW5kbGVycy90ZW1wby5qc29uIiwic3BlYyI6Imh0dHBzOi8vYWdlbnRzY29yZS5zaC9zcGVjaWZpY2F0aW9uL3BheW1lbnQtaGFuZGxlcnMvdGVtcG8iLCJ2ZXJzaW9uIjoiMjAyNi0wNC0wOCJ9XX0sInNlcnZpY2VzIjp7ImRldi51Y3Auc2hvcHBpbmciOlt7ImVuZHBvaW50IjoiaHR0cHM6Ly_ml6XmnKwuZXhhbXBsZS5jb20vYXBpL3VjcC9tY3AiLCJzY2hlbWEiOiJodHRwczovL3VjcC5kZXYvc2VydmljZXMvc2hvcHBpbmcvb3BlbnJwYy5qc29uIiwic3BlYyI6Imh0dHBzOi8vdWNwLmRldi8yMDI2LTA0LTA4L3NwZWNpZmljYXRpb24vb3ZlcnZpZXciLCJ0cmFuc3BvcnQiOiJtY3AiLCJ2ZXJzaW9uIjoiMjAyNi0wNC0wOCJ9XX0sInZlcnNpb24iOiIyMDI2LTA0LTE3In19.fraS8Y7ecHdldvmqwIdCzvSlBqi2GvYatX4UmSnR0jBnKDY8qxQnfYErAbJQ8ywXnP8Ztsp7PvbaRd90GIZ0CQ"
+    "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6InB5LXVuaWNvZGUtRWREU0EiLCJ0eXAiOiJhZ2VudHNjb3JlLXByb2ZpbGUrandzIn0.eyJzaWduaW5nX2tleXMiOlt7ImFsZyI6IkVkRFNBIiwiY3J2IjoiRWQyNTUxOSIsImtpZCI6InB5LXVuaWNvZGUtRWREU0EiLCJrdHkiOiJPS1AiLCJ1c2UiOiJzaWciLCJ4IjoiMnlGVWhTTHJNSW0xeWM1OUdnN3h0RG84OXlZRFhFcHRLa3poN2pReWo2QSJ9XSwidWNwIjp7ImNhcGFiaWxpdGllcyI6e30sIm5hbWUiOiJDYWbDqSDml6XmnKwg8J-NtyBNZXJjaGFudCIsInBheW1lbnRfaGFuZGxlcnMiOnsic2guYWdlbnRzY29yZS5wYXltZW50LnRlbXBvIjpbeyJjb25maWciOnsibm90ZSI6IuODoeODoiJ9LCJpZCI6InRlbXBvIiwic2NoZW1hIjoiaHR0cHM6Ly9hZ2VudHNjb3JlLnNoL3NjaGVtYXMvcGF5bWVudC1oYW5kbGVycy90ZW1wby5qc29uIiwic3BlYyI6Imh0dHBzOi8vYWdlbnRzY29yZS5zaC9zcGVjaWZpY2F0aW9uL3BheW1lbnQtaGFuZGxlcnMvdGVtcG8iLCJ2ZXJzaW9uIjoiMjAyNi0wNC0wOCJ9XX0sInNlcnZpY2VzIjp7ImRldi51Y3Auc2hvcHBpbmciOlt7ImVuZHBvaW50IjoiaHR0cHM6Ly_ml6XmnKwuZXhhbXBsZS5jb20vYXBpL3VjcC9tY3AiLCJzY2hlbWEiOiJodHRwczovL3VjcC5kZXYvc2VydmljZXMvc2hvcHBpbmcvb3BlbnJwYy5qc29uIiwic3BlYyI6Imh0dHBzOi8vdWNwLmRldi8yMDI2LTA0LTA4L3NwZWNpZmljYXRpb24vb3ZlcnZpZXciLCJ0cmFuc3BvcnQiOiJtY3AiLCJ2ZXJzaW9uIjoiMjAyNi0wNC0wOCJ9XX0sInZlcnNpb24iOiIyMDI2LTA0LTA4In19.bEMMVR7wkLpEs-DFvE75RqEpgaWaDsWb_J2uZUG3bX79W8RpERhquF5tIkYaVadCcCeXkKNJcY2vdnEM0XdVBQ"
   },
   "jwks": {
     "keys": [
       {
         "crv": "Ed25519",
-        "x": "Rk_x9yyAht9Xy_mKxxmdh0kyr12andlLUGHY2xh8-3w",
+        "x": "2yFUhSLrMIm1yc59Gg7xtDo89yYDXEptKkzh7jQyj6A",
         "kid": "py-unicode-EdDSA",
         "alg": "EdDSA",
         "use": "sig",
diff --git a/tests/test_ucp_jwks.py b/tests/test_ucp_jwks.py
index 2d28589..abe1dc1 100644
--- a/tests/test_ucp_jwks.py
+++ b/tests/test_ucp_jwks.py
@@ -17,7 +17,7 @@
 
 def _base_profile(signing_keys: list[dict]) -> dict:
     return {
-        "version": "2026-04-17",
+        "version": "2026-04-08",
         "spec": "https://ucp.dev/",
         "name": "Test Merchant",
         "services": [{"type": "rest", "url": "https://agents.example.com"}],
diff --git a/uv.lock b/uv.lock
index 8c461b9..62e5dc5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -10,7 +10,7 @@ resolution-markers = [
 
 [[package]]
 name = "agentscore-commerce"
-version = "1.5.0"
+version = "1.5.1"
 source = { editable = "." }
 dependencies = [
     { name = "agentscore-py" },