diff --git a/src/network.rs b/src/network.rs
index 858c623..e90ebc3 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 
 use anyhow::Result;
 use rand::{thread_rng, RngCore};
@@ -75,7 +75,8 @@ impl AnkFlag {
 pub struct CommitMessage {
     pub process_id: OutPoint, 
     pub pcd_commitment: Value, // map of field <=> hash of the clear value
-    pub roles: HashMap<String, RoleDefinition>, // Can be hashed and compared with the value above
+    pub roles: BTreeMap<String, RoleDefinition>, 
+    pub public_data: BTreeMap<String, String>,
     pub validation_tokens: Vec<Proof>,
     pub error: Option<AnkError>,
 }
@@ -86,12 +87,14 @@ impl CommitMessage {
     pub fn new_update_commitment(
         process_id: OutPoint,
         pcd_commitment: Value,
-        roles: HashMap<String, RoleDefinition>,
+        roles: BTreeMap<String, RoleDefinition>,
+        public_data: BTreeMap<String, String>,
     ) -> Self {
         Self {
             process_id,
             pcd_commitment,
             roles,
+            public_data,
             validation_tokens: vec![],
             error: None,
         }