diff --git a/compos/src/compsvc.rs b/compos/src/compsvc.rs
index 3a794ee..e21aa7d 100644
--- a/compos/src/compsvc.rs
+++ b/compos/src/compsvc.rs
@@ -86,6 +86,10 @@
     fn getPublicKey(&self) -> BinderResult<Vec<u8>> {
         to_binder_result(compos_key::get_public_key())
     }
+
+    fn getAttestationChain(&self) -> BinderResult<Vec<u8>> {
+        to_binder_result(compos_key::get_attestation_chain())
+    }
 }
 
 fn add_artifacts(target_dir: &Path, artifact_signer: &mut ArtifactSigner) -> Result<()> {