diff --git a/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs b/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
index ca937bf..88f8f05 100644
--- a/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
+++ b/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
@@ -4,24 +4,20 @@ namespace SVSim.BattleNode.Lifecycle;
 /// Default frame constants templated from TK2 prod captures, shared by the
 /// server-authored battle-frame builders. Every value here originated in a real prod
 /// frame in <c>data_dumps/captures/battle-traffic_tk2_regular.ndjson</c>; pulling them
-/// out of <see cref="ServerBattleFrames"/> makes the magic numerics navigable and gives
-/// the seed a single source of truth instead of two duplicated literals.
+/// out of <see cref="ServerBattleFrames"/> makes the magic numerics navigable. The shared effect
+/// seed and the deck-shuffle/idxChangeSeed are now derived per-battle from a master seed (see
+/// <see cref="BattleSeeds"/>) — only animation/UI constants remain here.
 /// </summary>
 internal static class BattleFrameDefaults
 {
-    // Shared per the spec — selfInfo.seed and oppoInfo.seed always agree.
-    // From frame[2] (Matched).
-    public const long BattleSeed = 17_548_138L;
-
     // From frame[5] (BattleStart). Hardcoded; see spec §Deferred plumbing — sourcing these
     // from real per-viewer state needs a TK2 rank/battle-point tracker.
     public const string PlayerRank = "10";
     public const string PlayerBattlePoint = "6270";
 
-    // From frame[8] (Ready). Provenance is "what prod sent"; the client
-    // doesn't validate, but echoing matches the capture protects against
-    // a regression on a future tightening.
-    public const int ReadyIdxChangeSeed = 771_335_280;
+    // From frame[8] (Ready). Provenance is "what prod sent"; the client doesn't validate. This is
+    // an animation crank value (shared-RNG spin), NOT gameplay randomness — both clients crank it
+    // identically and stay synced, so it stays a constant. See the spin-rng audit.
     public const int ReadySpin = 243;
 
     /// <summary>