diff --git a/libgsh/src/cr.rs b/libgsh/src/cr.rs
index 3579ca6..fd6f2db 100644
--- a/libgsh/src/cr.rs
+++ b/libgsh/src/cr.rs
@@ -17,8 +17,9 @@ pub struct CrRequest {
 
 #[derive(Serialize)]
 pub struct CrEvidence {
-    pub events: Vec<String>,
-    pub merkle_root: String,
+    pub session_id: Option<String>,
+    pub events: Vec<serde_json::Value>,
+    pub merkle_root: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -77,8 +78,9 @@ pub fn post_cr(client: &Client, base: &str, ac_id: &str, outcome: &str) -> CrRes
             outcome: outcome.into(),
             completed_at: now,
             chronicle_evidence: CrEvidence {
+                session_id: if session_id.is_empty() { None } else { Some(session_id.clone()) },
                 events: vec![],
-                merkle_root: String::new(),
+                merkle_root: None,
             },
             behavioral_attestation: CrAttestation {
                 status: "unavailable".into(),