From b33ddb347b431f5c5972fbf860ab02872dcc00ff Mon Sep 17 00:00:00 2001
From: Dmitriy Ryajov <dryajov@gmail.com>
Date: Tue, 16 Jan 2024 20:30:11 -0600
Subject: [PATCH] truncate entropy to 31 bytes, otherwise it might be > than
 mod

---
 codex/slots/sampler/sampler.nim | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/codex/slots/sampler/sampler.nim b/codex/slots/sampler/sampler.nim
index 7282f57e..7ddf5351 100644
--- a/codex/slots/sampler/sampler.nim
+++ b/codex/slots/sampler/sampler.nim
@@ -18,6 +18,7 @@ import pkg/constantine/math/arithmetic
 import pkg/poseidon2
 import pkg/poseidon2/types
 import pkg/poseidon2/io
+import pkg/stew/arrayops
 
 import ../../market
 import ../../blocktype as bt
@@ -86,9 +87,9 @@ proc getProofInput*(
   ## Generate proofs as input to the proving circuit.
   ##
 
-  without entropy =? Poseidon2Hash.fromBytes(entropy):
-    error "Failed to parse entropy"
-    return failure("Failed to parse entropy")
+  let
+    entropy = Poseidon2Hash.fromBytes(
+      array[31, byte].initCopyFrom(entropy[0..30])) # truncate to 31 bytes, otherwise it _might_ be greater than mod
 
   without verifyTree =? self.builder.verifyTree and
     verifyProof =? verifyTree.getProof(self.index) and