diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 237ef27..bb2d917 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,8 +16,8 @@ jobs:
       matrix:
         python-version: ["3.11", "3.12", "3.13"]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v5.3.0
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install package and test deps
diff --git a/schemas/trace-claim.json b/schemas/trace-claim.json
index ced6a9e..3e4f81f 100644
--- a/schemas/trace-claim.json
+++ b/schemas/trace-claim.json
@@ -11,7 +11,7 @@
   "properties": {
     "eat_profile": {"type": "string", "const": "tag:agentrust.io,2026:trace-v0.1"},
     "iat": {"type": "integer", "minimum": 1700000000},
-    "subject": {"type": "string", "pattern": "^spiffe://"},
+    "subject": {"type": "string", "pattern": "^(spiffe://|did:)"},
     "model": {
       "type": "object",
       "required": ["provider", "model_id"],
diff --git a/src/trace_tests/__init__.py b/src/trace_tests/__init__.py
index af7e308..df4daf9 100644
--- a/src/trace_tests/__init__.py
+++ b/src/trace_tests/__init__.py
@@ -1,3 +1,3 @@
 """TRACE conformance test suite."""
 
-__version__ = "0.1.0"
+__version__ = "0.2.0"
diff --git a/src/trace_tests/modules/tr_env.py b/src/trace_tests/modules/tr_env.py
index 2da4d33..0fc72f2 100644
--- a/src/trace_tests/modules/tr_env.py
+++ b/src/trace_tests/modules/tr_env.py
@@ -2,12 +2,14 @@
 
 from __future__ import annotations
 
+import re
 import time
 from typing import Any
 
 from trace_tests.result import Finding, Status
 
 _PROFILE = "tag:agentrust.io,2026:trace-v0.1"
+_SUBJECT_RE = re.compile(r'^(spiffe://[^/]+/.+|did:[a-z0-9]+:.+)$')
 _IAT_MIN = 1_700_000_000
 
 #: Default maximum record age (seconds). Records older than this fail freshness.
@@ -45,7 +47,7 @@ def check(trace: dict[str, Any], max_age_seconds: int = DEFAULT_MAX_AGE_SECONDS)
         findings.append(Finding("TR-ENV-002", Status.FAIL, f"iat must be a Unix timestamp >= {_IAT_MIN}, got {iat!r}"))
 
     subject = trace.get("subject", "")
-    if isinstance(subject, str) and subject.startswith(("spiffe://", "did:")):
+    if isinstance(subject, str) and _SUBJECT_RE.match(subject):
         findings.append(Finding("TR-ENV-003", Status.PASS, f"subject is a valid workload identity URI ({subject!r})"))
     else:
         findings.append(Finding("TR-ENV-003", Status.FAIL, f"subject must be a SPIFFE URI (spiffe://) or DID URI (did:), got {subject!r}"))
diff --git a/src/trace_tests/modules/tr_sig.py b/src/trace_tests/modules/tr_sig.py
index 4657a8f..c9d40cc 100644
--- a/src/trace_tests/modules/tr_sig.py
+++ b/src/trace_tests/modules/tr_sig.py
@@ -102,6 +102,15 @@ def check(trace: dict[str, Any], record: dict[str, Any], fmt: str, level: int =
     jwk = trace.get("cnf", {}).get("jwk", {})
     kty = jwk.get("kty")
     crv = jwk.get("crv")
+    x = jwk.get("x")
+
+    if "d" in jwk:
+        findings.append(Finding(
+            rule="TR-SIG-002",
+            status=Status.FAIL,
+            message="cnf.jwk must not contain private key material ('d' field present in JWK)",
+        ))
+        return findings
 
     if kty in _SUPPORTED_KTY:
         label = f"kty={kty!r}" + (f", crv={crv!r}" if crv else "")
diff --git a/tests/unit/test_loader.py b/tests/unit/test_loader.py
index 9115603..0c21657 100644
--- a/tests/unit/test_loader.py
+++ b/tests/unit/test_loader.py
@@ -53,8 +53,11 @@ def test_stripping_cmcp_version_is_rejected_not_downgraded(tmp_path):
         load_record(_write(tmp_path, stripped))
 
 
-@pytest.mark.parametrize("leftover", ["trace", "gateway", "signature"])
+@pytest.mark.parametrize("leftover", ["trace", "gateway"])
 def test_partial_envelope_with_single_cmcp_key_is_rejected(tmp_path, leftover):
+    # "signature" is intentionally excluded: plain TRACE records may carry an
+    # embedded signature field (agentrust-trace sign_record() output), so the
+    # loader allows it. Only "trace" and "gateway" are unambiguous cmcp markers.
     record = {**VALID_TRACE, leftover: VALID_CMCP[leftover]}
     with pytest.raises(LoadError, match="partial cmcp-runtime envelope"):
         load_record(_write(tmp_path, record))