Update smart_contracts_async_flow.svg

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diff --git a/doc-site/docs/images/smart_contracts_async_flow.svg b/doc-site/docs/images/smart_contracts_async_flow.svg
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+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="600" height="560" viewBox="0 0 600 560">
+  <rect width="600" height="560" fill="white"/>
+  
+  <defs>
+    <marker id="arrowhead" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
+      <polygon points="0 0, 10 3.5, 0 7" fill="#000000" />
+    </marker>
+  </defs>
+  
+  <!-- Title -->
+  <text x="300" y="30" font-family="Arial" font-size="16" font-weight="bold" text-anchor="middle">Smart Contracts Async Flow</text>
+  
+  <!-- Actor boxes -->
+  <rect x="50" y="60" width="60" height="40" fill="white" stroke="#0000CC" stroke-width="1.5"/>
+  <text x="80" y="85" font-family="Arial" font-size="12" font-weight="bold" text-anchor="middle">App</text>
+  
+  <rect x="190" y="60" width="60" height="40" fill="white" stroke="#00CC00" stroke-width="1.5"/>
+  <text x="220" y="85" font-family="Arial" font-size="12" font-weight="bold" text-anchor="middle">FireFly</text>
+  
+  <rect x="330" y="60" width="130" height="40" fill="white" stroke="#CC6600" stroke-width="1.5"/>
+  <text x="395" y="85" font-family="Arial" font-size="12" font-weight="bold" text-anchor="middle">Blockchain Connector</text>
+  
+  <rect x="490" y="60" width="80" height="40" fill="white" stroke="#6600CC" stroke-width="1.5"/>
+  <text x="530" y="85" font-family="Arial" font-size="12" font-weight="bold" text-anchor="middle">Blockchain</text>
+  
+  <!-- Lifelines -->
+  <line x1="80" y1="100" x2="80" y2="520" stroke="#000000" stroke-dasharray="5,5" stroke-width="1"/>
+  <line x1="220" y1="100" x2="220" y2="520" stroke="#000000" stroke-dasharray="5,5" stroke-width="1"/>
+  <line x1="395" y1="100" x2="395" y2="520" stroke="#000000" stroke-dasharray="5,5" stroke-width="1"/>
+  <line x1="530" y1="100" x2="530" y2="520" stroke="#000000" stroke-dasharray="5,5" stroke-width="1"/>
+  
+  <!-- Messages -->
+  <!-- 1. Invoke custom contract -->
+  <line x1="80" y1="140" x2="220" y2="140" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="150" y="135" font-family="Arial" font-size="11" text-anchor="middle">Invoke custom contract</text>
+  
+  <!-- 2. Submit transaction -->
+  <line x1="220" y1="170" x2="395" y2="170" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="308" y="165" font-family="Arial" font-size="11" text-anchor="middle">Submit transaction</text>
+  
+  <!-- 3. Submit transaction -->
+  <line x1="395" y1="200" x2="530" y2="200" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="463" y="195" font-family="Arial" font-size="11" text-anchor="middle">Submit transaction</text>
+  
+  <!-- 4. Transaction accepted -->
+  <line x1="530" y1="230" x2="395" y2="230" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="463" y="225" font-family="Arial" font-size="11" text-anchor="middle">Transaction accepted</text>
+  
+  <!-- 5. Transaction accepted -->
+  <line x1="395" y1="260" x2="220" y2="260" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="308" y="255" font-family="Arial" font-size="11" text-anchor="middle">Transaction accepted</text>
+  
+  <!-- 6. Submitted (Operation ID) -->
+  <line x1="220" y1="290" x2="80" y2="290" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="150" y="275" font-family="Arial" font-size="11" text-anchor="middle">Submitted</text>
+  <text x="150" y="285" font-family="Arial" font-size="11" text-anchor="middle">(Operation ID)</text>
+  
+  <!-- 7. Perform transaction -->
+  <path d="M 530,320 L 560,320 L 560,350 L 530,350" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)" fill="none"/>
+  <text x="550" y="305" font-family="Arial" font-size="10" text-anchor="start">Perform</text>
+  <text x="550" y="315" font-family="Arial" font-size="10" text-anchor="start">transaction</text>
+  
+  <!-- 8. Emit blockchain events -->
+  <line x1="530" y1="380" x2="395" y2="380" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="463" y="375" font-family="Arial" font-size="11" text-anchor="middle">Emit blockchain events</text>
+  
+  <!-- 9. Forward interested blockchain events -->
+  <line x1="395" y1="410" x2="220" y2="410" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="308" y="405" font-family="Arial" font-size="10" text-anchor="middle">Forward interested blockchain events</text>
+  
+  <!-- 10. Store events in database -->
+  <path d="M 220,430 L 250,430 L 250,460 L 220,460" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)" fill="none"/>
+  <text x="225" y="425" font-family="Arial" font-size="11" text-anchor="start">Store events in database</text>
+  
+  <!-- 11. Emit blockchain_event_received -->
+  <line x1="220" y1="480" x2="80" y2="480" stroke="#000000" stroke-width="1" marker-end="url(#arrowhead)"/>
+  <text x="150" y="475" font-family="Arial" font-size="9" text-anchor="middle">Emit blockchain_event_received</text>
+  
+  <!-- Note -->
+  <rect x="30" y="500" width="320" height="20" fill="white" stroke="#CC0000" stroke-width="1" rx="5" ry="5"/>
+  <text x="190" y="513" font-family="Arial" font-size="11" text-anchor="middle" fill="#CC0000">App can subscribe to events via WebSockets or Webhooks</text>
+</svg>
diff --git a/doc-site/docs/tutorials/custom_contracts/index.md b/doc-site/docs/tutorials/custom_contracts/index.md
@@ -49,8 +49,6 @@ Like the rest of FireFly, custom onchain logic support are implemented with an a
 - The transaction itself happens asynchronously from the HTTP request that initiated it
 - Blockchain events emitted by the custom onchain logic (Ethereum smart contracts, Fabric chaincodes, Corda flows, etc.) will be stored in FireFly's database if FireFly has a **Event Listener** set up for that specific type of event. FireFly will also emit an event of type `blockchain_event_received` when this happens.
 
-<!-- TODO: Update this diagram -->
-
 ![Smart Contracts Async Flow](../../images/smart_contracts_async_flow.svg "Smart Contracts Async Flow")
 
 <!--nav-->
