diff --git a/README.md b/README.md
index dee09de..f2d6811 100644
--- a/README.md
+++ b/README.md
@@ -113,8 +113,8 @@ Results on an Apple M1 Pro with Rust 1.72.0-nightly:
 
 | BLS implementation | Classic mainnet | Fastnet  |
 | ------------------ | --------------- | -------- |
-| zkcrypto           | 1.958 ms        | 1.489 ms |
-| arkworks           | 1.748 ms        | 1.452 ms |
+| zkcrypto           | 1.956 ms        | 1.489 ms |
+| arkworks           | 1.714 ms        | 1.425 ms |
 
 ## License
 
diff --git a/src/verify.rs b/src/verify.rs
index 2049c36..da8539e 100644
--- a/src/verify.rs
+++ b/src/verify.rs
@@ -229,11 +229,11 @@ impl fmt::Display for VerificationError {
 
 impl Error for VerificationError {}
 
-fn message(current_round: u64, prev_sig: &[u8]) -> Vec<u8> {
+fn message(current_round: u64, prev_sig: &[u8]) -> [u8; 32] {
     let mut hasher = Sha256::default();
     hasher.update(prev_sig);
     hasher.update(round_to_bytes(current_round));
-    hasher.finalize().to_vec()
+    hasher.finalize().into()
 }
 
 /// https://github.com/drand/drand-client/blob/master/wasm/chain/verify.go#L28-L33