diff --git a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
index 514e4fc2b..dad72e30d 100644
--- a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
+++ b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
@@ -98,11 +98,7 @@ proc uint64ToField*(n: uint64): array[32, byte] =
   result[0 ..< bytes.len] = bytes
 
 proc UInt256ToField*(v: UInt256): array[32, byte] =
-  var bytes: array[32, byte]
-  let vBytes = v.toBytesBE()
-  for i in 0 .. 31:
-    bytes[i] = vBytes[31 - i]
-  return bytes
+  return cast[array[32, byte]](v)
 
 proc seqToField*(s: seq[byte]): array[32, byte] =
   result = default(array[32, byte])
@@ -110,18 +106,6 @@ proc seqToField*(s: seq[byte]): array[32, byte] =
   for i in 0 ..< len:
     result[i] = s[i]
 
-proc uint256ToBinarySeq*(value: UInt256, len: int): seq[byte] =
-  result = newSeq[byte](len) # Create a sequence of specified length
-  var v = value
-
-  # Fill from least significant bit (little-endian)
-  for i in 0 ..< len:
-    if v mod 2 == 1:
-      result[i] = 1
-    else:
-      result[i] = 0
-    v = v shr 1 # Shift right by 1 bit
-
 proc fetchMerkleProofElements*(
     g: OnchainGroupManager
 ): Future[Result[seq[byte], string]] {.async.} =
@@ -433,6 +417,7 @@ method generateProof*(
   )
 
   let serializedWitness = serialize(witness)
+
   debug "--- serializedWitness ---", before = witness, after = serializedWitness
   var input_witness_buffer = toBuffer(serializedWitness)