diff --git a/examples/plutus.mdx b/examples/plutus.mdx
index 71a447c..a38dae4 100644
--- a/examples/plutus.mdx
+++ b/examples/plutus.mdx
@@ -11,9 +11,9 @@ party Beneficiary;
 policy TimeLock = 0x6b9c456aa650cb808a9ab54326e039d5235ed69f069c9664a8fe5b69;
 
 type State {
-  lock_until: Int,
-  owner: Bytes,
-  beneficiary: Bytes,
+    lock_until: Int,
+    owner: Bytes,
+    beneficiary: Bytes,
 }
 
 tx lock(
@@ -24,7 +24,7 @@ tx lock(
         from: Owner,
         min_amount: Ada(quantity) + fees,
     }
-    
+
     output target {
         to: TimeLock,
         amount: Ada(quantity),
@@ -66,44 +66,51 @@ tx unlock(
 
 ```tx3
 party Sender;
-party Receiver;
 
-// Always true plutus v2
-policy OrderBook = 0x39c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5;
+policy OrderBook {
+    hash: 0x7039c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5,
+    script: 0xfacd82a32c6692dd60b6b930a86569d4f7a5558684bebc7b2f34259f0dc20b07#0,
+}
 
-// Policy always true
-asset ControlToken = 0x13a0e59ca61ab277e909ffd20def27d296051fbc634cf623c02322a5.CONTROL;
-asset Ask = 0x13a0e59ca61ab277e909ffd20def27d296051fbc634cf623c02322a5.ASK;
-asset Bid = 0x13a0e59ca61ab277e909ffd20def27d296051fbc634cf623c02322a5.BID;
+asset ControlToken = 0x39c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5."CONTROL";
+asset Bid = 0x39c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5."BID";
 
 type AssetClass {
-  policy: Bytes,
-  name: Bytes,
+    policy: Bytes,
+    name: Bytes,
 }
 
 type DatumValue {
-  asset_class: AssetClass,
-  amount: Int,
+    asset_class: AssetClass,
+    amount: Int,
 }
 
 type OrderInfo {
-  sender_address: Bytes,
-  token: DatumValue,
+    sender_address: Bytes,
+    token: DatumValue,
 }
 
 
 type OrderDatum {
-  info: OrderInfo,
-  control_asset_class: AssetClass,
+    info: OrderInfo,
+    control_asset_class: AssetClass,
 }
 
 
 tx new_order() {
+    reference contract {
+        ref: 0xfacd82a32c6692dd60b6b930a86569d4f7a5558684bebc7b2f34259f0dc20b07#0,
+    }
+
     input source {
         from: Sender,
         min_amount: fees + Bid(1) + Ada(2000000),
     }
 
+    collateral {
+        ref: 0x5f820f170b7a7322f51e51fe6ed871d35b312d5ebcd6ac37cd2f9cfdf50f8c85#9,
+    }
+
     mint {
         amount: ControlToken(1),
         redeemer: (),
@@ -111,31 +118,31 @@ tx new_order() {
 
     output change {
         to: Sender,
-        amount: source - Ada(2000000)- fees - Bid(1),
+        amount: source - Ada(2000000) - fees - Bid(1),
     }
 
     output order {
         to: OrderBook,
-        amount: Ada(2000000) + Bid(1),
+        amount: Ada(2000000) + Bid(1) + ControlToken(1),
         datum: OrderDatum {
             info: OrderInfo {
-                // Problem: serialize address into datum
-                sender_address: 0x00eb5a3cf99aa1d77357864ed2d2fcbdb07a292363f0944122c510a30d58305b9bc8f9bea6e23d4e459d46aacc606eb20b29a27024175549e9,
+                sender_address: Sender,
                 token: DatumValue {
-                    // Problem: serialize the ASK token
                     asset_class: AssetClass {
-                        policy: 0x13a0e59ca61ab277e909ffd20def27d296051fbc634cf623c02322a5,
+                        policy: 0x39c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5,
                         name: "ASK",
                     },
                     amount: 1,
                 },
             },
-            // Problem: serialize the CONTROL token
             control_asset_class: AssetClass {
-                policy: 0x13a0e59ca61ab277e909ffd20def27d296051fbc634cf623c02322a5,
+                policy: 0x39c520d0627aafa728f7e4dd10142b77c257813c36f57e2cb88f72a5,
                 name: "CONTROL",
             },
         },
     }
+    metadata {
+        674: "SOME METADATA",
+    }
 }
-```
\ No newline at end of file
+```