diff --git a/data-model/src/store.rs b/data-model/src/store.rs
index e7b9790..9231355 100644
--- a/data-model/src/store.rs
+++ b/data-model/src/store.rs
@@ -149,7 +149,11 @@ where
     AT: AuthorisationToken<MCL, MCC, MPL, N, S, PD>,
 {
     /// A new entry was ingested.
-    Ingested(u64, AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>),
+    Ingested(
+        u64,
+        AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>,
+        EntryOrigin,
+    ),
     /// An existing entry received a portion of its corresponding payload.
     Appended(u64, LengthyAuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>),
     /// An entry was forgotten.
@@ -188,6 +192,14 @@ pub enum ForgetPayloadError {
     ReferredToByOtherEntries,
 }
 
+/// The origin of an entry ingestion event.
+pub enum EntryOrigin {
+    /// The entry was probably created on this machine.
+    Local,
+    /// The entry was sourced from another device, e.g. a networked sync session.
+    Remote(u64),
+}
+
 /// A [`Store`] is a set of [`AuthorisedEntry`] belonging to a single namespace, and a  (possibly partial) corresponding set of payloads.
 pub trait Store<const MCL: usize, const MCC: usize, const MPL: usize, N, S, PD, AT>
 where