From 12cda7c81e7627eebcbae83a0b5894e93efc60d4 Mon Sep 17 00:00:00 2001
From: Hamish Peebles <hamishpeebles@gmail.com>
Date: Wed, 18 Dec 2024 15:29:30 +0000
Subject: [PATCH] Bound the jitter

---
 backend/canisters/community/impl/src/updates/claim_prize.rs | 3 ++-
 backend/canisters/group/impl/src/updates/claim_prize.rs     | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/backend/canisters/community/impl/src/updates/claim_prize.rs b/backend/canisters/community/impl/src/updates/claim_prize.rs
index 24270434d2..942be3ab8b 100644
--- a/backend/canisters/community/impl/src/updates/claim_prize.rs
+++ b/backend/canisters/community/impl/src/updates/claim_prize.rs
@@ -102,7 +102,8 @@ fn prepare(args: &Args, state: &mut RuntimeState) -> Result<PrepareResult, Box<R
     };
 
     // Hack to ensure 2 prizes claimed by the same user in the same block don't result in "duplicate transaction" errors.
-    let transaction_time = now_nanos - u32::from(result.message_index) as u64;
+    let jitter = u32::from(result.message_index) as u64 % 1000;
+    let transaction_time = now_nanos - jitter;
 
     let transaction = create_pending_transaction(
         result.token,
diff --git a/backend/canisters/group/impl/src/updates/claim_prize.rs b/backend/canisters/group/impl/src/updates/claim_prize.rs
index 5771c0b225..c7ea2cacc6 100644
--- a/backend/canisters/group/impl/src/updates/claim_prize.rs
+++ b/backend/canisters/group/impl/src/updates/claim_prize.rs
@@ -87,7 +87,8 @@ fn prepare(args: &Args, state: &mut RuntimeState) -> Result<PrepareResult, Box<R
         };
 
         // Hack to ensure 2 prizes claimed by the same user in the same block don't result in "duplicate transaction" errors.
-        let transaction_time = now_nanos - u32::from(result.message_index) as u64;
+        let jitter = u32::from(result.message_index) as u64 % 1000;
+        let transaction_time = now_nanos - jitter;
 
         let transaction = create_pending_transaction(
             result.token,