diff --git a/cawg_identity/src/identity_assertion/assertion.rs b/cawg_identity/src/identity_assertion/assertion.rs
index 2371213b9..51fce7ee7 100644
--- a/cawg_identity/src/identity_assertion/assertion.rs
+++ b/cawg_identity/src/identity_assertion/assertion.rs
@@ -12,7 +12,7 @@
 // each license.
 
 use std::{
-    collections::HashMap,
+    collections::BTreeMap,
     fmt::{Debug, Formatter},
 };
 
@@ -167,12 +167,12 @@ impl IdentityAssertion {
     ) -> impl Serialize {
         // NOTE: We can't write this using .map(...).collect() because there are async
         // calls.
-        let mut reports: HashMap<
+        let mut reports: BTreeMap<
             String,
             IdentityAssertionsForManifest<
                 <<SV as SignatureVerifier>::Output as ToCredentialSummary>::CredentialSummary,
             >,
-        > = HashMap::new();
+        > = BTreeMap::new();
 
         for (id, manifest) in store.manifests() {
             let report = Self::summarize_all_impl(manifest, verifier).await;
@@ -193,12 +193,12 @@ impl IdentityAssertion {
     ) -> impl Serialize {
         // NOTE: We can't write this using .map(...).collect() because there are async
         // calls.
-        let mut reports: HashMap<
+        let mut reports: BTreeMap<
             String,
             IdentityAssertionsForManifest<
                 <<SV as SignatureVerifier>::Output as ToCredentialSummary>::CredentialSummary,
             >,
-        > = HashMap::new();
+        > = BTreeMap::new();
 
         for manifest in reader.iter_manifests() {
             let report = Self::summarize_all_impl(manifest, verifier).await;
diff --git a/cawg_identity/src/identity_assertion/report.rs b/cawg_identity/src/identity_assertion/report.rs
index c9610c628..af4451bd4 100644
--- a/cawg_identity/src/identity_assertion/report.rs
+++ b/cawg_identity/src/identity_assertion/report.rs
@@ -11,7 +11,7 @@
 // specific language governing permissions and limitations under
 // each license.
 
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 
 use serde::{
     ser::{SerializeMap, SerializeSeq},
@@ -22,7 +22,7 @@ use crate::identity_assertion::signer_payload::SignerPayload;
 
 #[doc(hidden)]
 pub struct IdentityAssertionsForManifestStore<IAR: Serialize> {
-    pub(crate) assertions_for_manifest: HashMap<String, IdentityAssertionsForManifest<IAR>>,
+    pub(crate) assertions_for_manifest: BTreeMap<String, IdentityAssertionsForManifest<IAR>>,
 }
 
 impl<IAR: Serialize> Serialize for IdentityAssertionsForManifestStore<IAR> {
diff --git a/cawg_identity/src/tests/claim_aggregation/interop.rs b/cawg_identity/src/tests/claim_aggregation/interop.rs
index d9c99ce5e..50b6df71c 100644
--- a/cawg_identity/src/tests/claim_aggregation/interop.rs
+++ b/cawg_identity/src/tests/claim_aggregation/interop.rs
@@ -100,3 +100,25 @@ async fn adobe_connected_identities() {
         r#"[{"sig_type":"cawg.identity_claims_aggregation","referenced_assertions":["c2pa.hash.data"],"named_actor":{"@context":["https://www.w3.org/ns/credentials/v2","https://creator-assertions.github.io/tbd/tbd"],"type":["VerifiableCredential","IdentityClaimsAggregationCredential"],"issuer":"did:web:connected-identities.identity-stage.adobe.com","validFrom":"2024-10-03T21:47:02Z","verifiedIdentities":[{"type":"cawg.social_media","username":"Robert Tiles","uri":"https://net.s2stagehance.com/roberttiles","verifiedAt":"2024-09-24T18:15:11Z","provider":{"id":"https://behance.net","name":"behance"}}],"credentialSchema":[{"id":"https://creator-assertions.github.io/schemas/v1/creator-identity-assertion.json","type":"JSONSchema"}]}}]"#
     );
 }
+
+#[cfg_attr(not(target_arch = "wasm32"), tokio::test)]
+#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+async fn ims_multiple_manifests() {
+    let format = "image/jpeg";
+    let test_image = include_bytes!("../fixtures/claim_aggregation/ims_multiple_manifests.jpg");
+
+    let mut test_image = Cursor::new(test_image);
+
+    let reader = Reader::from_stream(format, &mut test_image).unwrap();
+    assert_eq!(reader.validation_status(), None);
+
+    // Check the summary report for the entire manifest store.
+    let isv = IcaSignatureVerifier {};
+    let ia_summary = IdentityAssertion::summarize_from_reader(&reader, &isv).await;
+    let ia_json = serde_json::to_string(&ia_summary).unwrap();
+
+    assert_eq!(
+        ia_json,
+        r#"{"urn:uuid:7256ca36-2a90-44ec-914d-f17c8d70c31f":[{"sig_type":"cawg.identity_claims_aggregation","referenced_assertions":["c2pa.hash.data"],"named_actor":{"@context":["https://www.w3.org/ns/credentials/v2","https://creator-assertions.github.io/tbd/tbd"],"type":["VerifiableCredential","IdentityClaimsAggregationCredential"],"issuer":"did:web:connected-identities.identity-stage.adobe.com","validFrom":"2025-02-13T00:40:47Z","verifiedIdentities":[{"type":"cawg.social_media","username":"firstlast555","uri":"https://net.s2stagehance.com/firstlast555","verifiedAt":"2025-01-10T19:53:59Z","provider":{"id":"https://behance.net","name":"behance"}}],"credentialSchema":[{"id":"https://cawg.io/schemas/v1/creator-identity-assertion.json","type":"JSONSchema"}]}}],"urn:uuid:b55062ef-96b6-4f6e-bb7d-9c415f130471":[{"sig_type":"cawg.identity_claims_aggregation","referenced_assertions":["c2pa.hash.data"],"named_actor":{"@context":["https://www.w3.org/ns/credentials/v2","https://creator-assertions.github.io/tbd/tbd"],"type":["VerifiableCredential","IdentityClaimsAggregationCredential"],"issuer":"did:web:connected-identities.identity-stage.adobe.com","validFrom":"2024-10-03T21:47:02Z","verifiedIdentities":[{"type":"cawg.social_media","username":"Robert Tiles","uri":"https://net.s2stagehance.com/roberttiles","verifiedAt":"2024-09-24T18:15:11Z","provider":{"id":"https://behance.net","name":"behance"}}],"credentialSchema":[{"id":"https://creator-assertions.github.io/schemas/v1/creator-identity-assertion.json","type":"JSONSchema"}]}}]}"#
+    );
+}
diff --git a/cawg_identity/src/tests/fixtures/claim_aggregation/ims_multiple_manifests.jpg b/cawg_identity/src/tests/fixtures/claim_aggregation/ims_multiple_manifests.jpg
new file mode 100644
index 000000000..725613782
Binary files /dev/null and b/cawg_identity/src/tests/fixtures/claim_aggregation/ims_multiple_manifests.jpg differ