diff --git a/src/network.rs b/src/network.rs
index 7e66269..c7c2b54 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -4,14 +4,16 @@ use anyhow::{Error, Result};
 use js_sys::Date;
 use rand::{thread_rng, RngCore};
 use serde::{Deserialize, Serialize};
-use serde_json::Value;
+use serde_json::{Map, Value};
+use sp_client::bitcoin::consensus::serialize;
 use sp_client::bitcoin::hex::{DisplayHex, FromHex};
-use sp_client::bitcoin::OutPoint;
+use sp_client::bitcoin::{OutPoint, Transaction};
 use tsify::Tsify;
 
 use crate::crypto::AAD;
 use crate::error::AnkError;
 use crate::pcd::Member;
+use crate::signature::Proof;
 
 #[derive(Debug, Serialize, Deserialize, Tsify)]
 #[tsify(into_wasm_abi, from_wasm_abi)]
@@ -19,6 +21,7 @@ pub enum AnkFlag {
     NewTx,
     Faucet,
     Cipher,
+    Commit,
     Unknown,
 }
 
@@ -28,6 +31,7 @@ impl From<&str> for AnkFlag {
             "NewTx" => Self::NewTx,
             "Faucet" => Self::Faucet,
             "Cipher" => Self::Cipher,
+            "Commit" => Self::Commit,
             _ => Self::Unknown,
         }
     }
@@ -45,6 +49,7 @@ impl AnkFlag {
             0 => Self::NewTx,
             1 => Self::Faucet,
             2 => Self::Cipher,
+            3 => Self::Commit,
             _ => Self::Unknown,
         }
     }
@@ -53,12 +58,59 @@ impl AnkFlag {
         match self {
             Self::NewTx => "NewTx",
             Self::Faucet => "Faucet",
-            Self::Cipher => "Cipher",
+            Self::Cipher => "Cipher", 
+            Self::Commit => "Commit",
             Self::Unknown => "Unknown",
         }
     }
 }
 
+/// Message sent to the server to commit some state in a transaction
+/// Client must first send a commit message with empty validation_tokens
+/// Relay will ignore a commit message for an update he's not aware of that also bears validation_tokens
+#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Tsify)]
+#[tsify(into_wasm_abi, from_wasm_abi)]
+pub struct CommitMessage {
+    pub init_tx: String, // Can be tx or txid of the first transaction of the chain, which is maybe not ideal
+    pub encrypted_pcd: Map<String, Value>,
+    pub keys: Map<String, Value>,
+    pub validation_tokens: Vec<Proof>,
+    pub error: Option<AnkError>,
+}
+
+impl CommitMessage {
+    /// Create a new commitment message for the first transaction of the chain
+    /// init_tx must be the hex string of the transaction
+    /// validation_tokens must be empty
+    pub fn new_first_commitment(transaction: Transaction, encrypted_pcd: Map<String, Value>, keys: Map<String, Value>) -> Self {
+        Self {
+            init_tx: serialize(&transaction).to_lower_hex_string(),
+            encrypted_pcd,
+            keys,
+            validation_tokens: vec![],
+            error: None,
+        }
+    }
+
+    /// Create a new commitment message for an update transaction
+    /// init_tx must be the hex string of the txid of the first commitment transaction
+    /// validation_tokens must be empty
+    pub fn new_update_commitment(init_tx: OutPoint, encrypted_pcd: Map<String, Value>, keys: Map<String, Value>) -> Self {
+        Self {
+            init_tx: init_tx.to_string(),
+            encrypted_pcd,
+            keys,
+            validation_tokens: vec![],
+            error: None,
+        }
+    }
+
+    /// Set the validation tokens for a pending commitment
+    pub fn set_validation_tokens(&mut self, validation_tokens: Vec<Proof>) {
+        self.validation_tokens = validation_tokens;
+    }
+}
+
 #[derive(Debug, Serialize, Deserialize, Tsify)]
 #[tsify(into_wasm_abi, from_wasm_abi)]
 pub struct FaucetMessage {