diff --git a/crates/originweave-evidence/src/action_outcome.rs b/crates/originweave-evidence/src/action_outcome.rs
index ed4520f9..5bc7dd26 100644
--- a/crates/originweave-evidence/src/action_outcome.rs
+++ b/crates/originweave-evidence/src/action_outcome.rs
@@ -30,6 +30,8 @@ pub enum VerifiedActionOutcomeError {
         /// Monotonic timestamp recorded when the post-condition was observed.
         observed_at_milliseconds: u64,
     },
+    /// Node-state provenance belongs to an origin other than the governed action target.
+    PostConditionOriginMismatch,
 }
 
 impl Display for VerifiedActionOutcomeError {
@@ -44,6 +46,9 @@ impl Display for VerifiedActionOutcomeError {
                 formatter,
                 "post-condition observation at {observed_at_milliseconds} ms predates action dispatch at {dispatched_at_milliseconds} ms"
             ),
+            Self::PostConditionOriginMismatch => formatter.write_str(
+                "node-state post-condition provenance must match the governed action target origin",
+            ),
         }
     }
 }
@@ -53,10 +58,11 @@ impl Error for VerifiedActionOutcomeError {}
 /// Credential-safe evidence that a typed action completed its verified post-condition.
 ///
 /// Construction is intentionally fail-closed: a command acknowledgement, an
-/// unverified observation, rejected provenance, or an observation timestamp
-/// earlier than the action dispatch cannot be represented by this type as
-/// successful action completion. Equal dispatch and observation timestamps are
-/// permitted because a bounded adapter may use a coarse monotonic clock.
+/// unverified observation, rejected provenance, an observation timestamp earlier
+/// than the action dispatch, or node-state provenance from a different origin
+/// cannot be represented by this type as successful action completion. Equal
+/// dispatch and observation timestamps are permitted because a bounded adapter
+/// may use a coarse monotonic clock.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct VerifiedActionOutcomeEvidence {
     action: ActionKind,
@@ -73,6 +79,8 @@ impl VerifiedActionOutcomeEvidence {
     ///
     /// Both timestamps must come from the same monotonic clock domain. The
     /// observation may share the dispatch tick, but it may never predate it.
+    /// `NodeStateChanged` provenance must also originate from the canonical
+    /// action target; URL and network outcomes are not constrained by that rule.
     pub fn new(
         action: ActionKind,
         target_origin: Origin,
@@ -91,6 +99,11 @@ impl VerifiedActionOutcomeEvidence {
                 observed_at_milliseconds,
             });
         }
+        if post_condition == PostConditionKind::NodeStateChanged
+            && provenance.source_origin() != &target_origin
+        {
+            return Err(VerifiedActionOutcomeError::PostConditionOriginMismatch);
+        }
         Ok(Self {
             action,
             target_origin,
diff --git a/crates/originweave-evidence/src/lib.rs b/crates/originweave-evidence/src/lib.rs
index 184390f1..2839fd6b 100644
--- a/crates/originweave-evidence/src/lib.rs
+++ b/crates/originweave-evidence/src/lib.rs
@@ -257,6 +257,7 @@ fn redact_all_values(values: BTreeMap<String, String>) -> BTreeMap<String, Strin
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ProvenanceRecord {
     source_url: String,
+    source_origin: Origin,
     source_locator: String,
     source_hash: String,
     source_kind: EvidenceSourceKind,
@@ -277,9 +278,9 @@ impl ProvenanceRecord {
         {
             return Err(EvidenceError::LimitExceeded);
         }
-        if !valid_source_url(source_url) {
+        let Some(source_origin) = parse_source_origin(source_url) else {
             return Err(EvidenceError::InvalidSourceUrl);
-        }
+        };
         if source_locator.is_empty() {
             return Err(EvidenceError::EmptyLocator);
         }
@@ -288,6 +289,7 @@ impl ProvenanceRecord {
         }
         Ok(Self {
             source_url: source_url.to_owned(),
+            source_origin,
             source_locator: source_locator.to_owned(),
             source_hash: source_hash.to_owned(),
             source_kind,
@@ -301,6 +303,10 @@ impl ProvenanceRecord {
         &self.source_url
     }
 
+    pub(crate) const fn source_origin(&self) -> &Origin {
+        &self.source_origin
+    }
+
     /// Return the channel-specific evidence locator.
     #[must_use]
     pub fn source_locator(&self) -> &str {
@@ -326,26 +332,28 @@ impl ProvenanceRecord {
     }
 }
 
-fn valid_source_url(source_url: &str) -> bool {
+fn parse_source_origin(source_url: &str) -> Option<Origin> {
     if source_url.is_empty()
         || source_url
             .chars()
             .any(|character| character.is_control() || character.is_whitespace())
         || source_url.contains(['?', '#', '\\'])
     {
-        return false;
+        return None;
     }
-    let Some((scheme, remainder)) = source_url.split_once("://") else {
-        return false;
+    let (scheme, remainder) = source_url.split_once("://")?;
+    let authority_end = match remainder.find('/') {
+        Some(index) => index,
+        None => remainder.len(),
     };
-    let authority_end = remainder.find('/').unwrap_or(remainder.len());
     let authority = &remainder[..authority_end];
     let origin_text = format!("{scheme}://{authority}");
-    if Origin::parse(&origin_text).is_err() {
-        return false;
-    }
+    let origin = Origin::parse(&origin_text).ok()?;
     let path = &remainder[authority_end..];
-    path.is_empty() || validate_path(path).is_ok()
+    if !path.is_empty() && validate_path(path).is_err() {
+        return None;
+    }
+    Some(origin)
 }
 
 fn valid_sha256(source_hash: &str) -> bool {
diff --git a/crates/originweave-evidence/tests/verified_action_outcome.rs b/crates/originweave-evidence/tests/verified_action_outcome.rs
index 4cf33ac3..d610c5db 100644
--- a/crates/originweave-evidence/tests/verified_action_outcome.rs
+++ b/crates/originweave-evidence/tests/verified_action_outcome.rs
@@ -22,8 +22,12 @@ fn origin() -> Origin {
 }
 
 fn provenance(result: VerificationResult) -> ProvenanceRecord {
+    provenance_at("https://app.example/receipt", result)
+}
+
+fn provenance_at(source_url: &str, result: VerificationResult) -> ProvenanceRecord {
     ProvenanceRecord::new(
-        "https://app.example/receipt",
+        source_url,
         "dom:#receipt-status",
         VALID_SOURCE_HASH,
         EvidenceSourceKind::DomTree,
@@ -116,6 +120,51 @@ fn post_condition_observation_cannot_predate_action_dispatch() {
     );
 }
 
+#[test]
+fn node_state_post_condition_provenance_must_match_the_action_target_origin() {
+    let error = VerifiedActionOutcomeEvidence::new(
+        ActionKind::Submit,
+        origin(),
+        intent(),
+        PostConditionKind::NodeStateChanged,
+        DISPATCHED_AT_MILLISECONDS,
+        OBSERVED_AT_MILLISECONDS,
+        provenance_at(
+            "https://attacker.example/receipt",
+            VerificationResult::Verified,
+        ),
+    )
+    .expect_err("a different origin cannot prove the target node changed");
+
+    assert_eq!(
+        error,
+        VerifiedActionOutcomeError::PostConditionOriginMismatch
+    );
+    assert_eq!(
+        error.to_string(),
+        "node-state post-condition provenance must match the governed action target origin"
+    );
+}
+
+#[test]
+fn node_state_origin_comparison_uses_canonical_origin_semantics() {
+    let evidence = VerifiedActionOutcomeEvidence::new(
+        ActionKind::Submit,
+        origin(),
+        intent(),
+        PostConditionKind::NodeStateChanged,
+        DISPATCHED_AT_MILLISECONDS,
+        OBSERVED_AT_MILLISECONDS,
+        provenance_at(
+            "https://APP.EXAMPLE:443/receipt",
+            VerificationResult::Verified,
+        ),
+    )
+    .expect("canonical equivalent source origin should be accepted");
+
+    assert_eq!(evidence.target_origin(), &origin());
+}
+
 #[test]
 fn same_monotonic_tick_is_allowed_for_coarse_clock_sources() {
     let evidence = VerifiedActionOutcomeEvidence::new(