diff --git a/samples/eve-browser-network/Program.cs b/samples/eve-browser-network/Program.cs
index 68f72e05..c26d654b 100644
--- a/samples/eve-browser-network/Program.cs
+++ b/samples/eve-browser-network/Program.cs
@@ -467,9 +467,9 @@ sealed class Args
 [MessagePackObject]
 public sealed class CounterState
 {
-    [Key("counterId")] public string CounterId { get; set; } = "";
-    [Key("count")] public int Count { get; set; }
-    [Key("receipts")] public Dictionary<string, IncrementReceipt> Receipts { get; set; } = new(StringComparer.Ordinal);
+    [Key(0)] public string CounterId { get; set; } = "";
+    [Key(1)] public int Count { get; set; }
+    [Key(2)] public Dictionary<string, IncrementReceipt> Receipts { get; set; } = new(StringComparer.Ordinal);
     public static CounterState Initial(string counterId) => new() { CounterId = counterId };
 }
 
diff --git a/samples/eve-browser-network/browser/main.ts b/samples/eve-browser-network/browser/main.ts
index b04ee5c8..fac4cc43 100644
--- a/samples/eve-browser-network/browser/main.ts
+++ b/samples/eve-browser-network/browser/main.ts
@@ -7,6 +7,10 @@ import {
   decodeCultNetPayload,
 } from "cultmesh-browser";
 
+// CounterState is an integer-keyed MessagePack object: [counterId, count, receipts].
+const counterCount = (record: Parameters<typeof decodeCultNetPayload>[0]) =>
+  decodeCultNetPayload<[string, number, unknown]>(record)[1];
+
 declare global {
   interface Window {
     __sampleReady?: boolean;
@@ -83,17 +87,17 @@ try {
     stateBindingResolver: async binding => {
       if (binding.pointerId !== "sample.counter.count") return undefined;
       return {
-        latest: async () => decodeCultNetPayload<{ count: number }>(counter.current!).count,
+        latest: async () => counterCount(counter.current!),
         watch: callback => counter.watch(record => {
           if (!record) return;
-          const count = decodeCultNetPayload<{ count: number }>(record).count;
+          const count = counterCount(record);
           window.__sampleCount = count;
           callback(count);
         }),
       };
     },
   });
-  window.__sampleCount = decodeCultNetPayload<{ count: number }>(counter.current!).count;
+  window.__sampleCount = counterCount(counter.current!);
   window.__sampleReady = true;
 } catch (error) {
   const details = error instanceof AggregateError
diff --git a/src/GameCult.Mesh/docs/getting-started/01-persist-typed-state.md b/src/GameCult.Mesh/docs/getting-started/01-persist-typed-state.md
index 7520d67f..f7924ec8 100644
--- a/src/GameCult.Mesh/docs/getting-started/01-persist-typed-state.md
+++ b/src/GameCult.Mesh/docs/getting-started/01-persist-typed-state.md
@@ -15,8 +15,8 @@ using MessagePack;
 [MessagePackObject]
 public sealed class CounterState
 {
-    [Key("counterId")] public string CounterId { get; set; } = "";
-    [Key("count")] public int Count { get; set; }
+    [Key(0)] public string CounterId { get; set; } = "";
+    [Key(1)] public int Count { get; set; }
 }
 ```