diff --git a/http-signature-normalization-actix/Cargo.toml b/http-signature-normalization-actix/Cargo.toml
index 4c31f44..fa1fe57 100644
--- a/http-signature-normalization-actix/Cargo.toml
+++ b/http-signature-normalization-actix/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "http-signature-normalization-actix"
 description = "An HTTP Signatures library that leaves the signing to you"
-version = "0.4.0-alpha.0"
+version = "0.4.0-alpha.1"
 authors = ["asonix <asonix@asonix.dog>"]
 license-file = "LICENSE"
 readme = "README.md"
diff --git a/http-signature-normalization-actix/src/digest/middleware.rs b/http-signature-normalization-actix/src/digest/middleware.rs
index 10f511d..ebb2a3f 100644
--- a/http-signature-normalization-actix/src/digest/middleware.rs
+++ b/http-signature-normalization-actix/src/digest/middleware.rs
@@ -5,9 +5,9 @@ use actix_web::{
     dev::{MessageBody, Payload, Service, ServiceRequest, ServiceResponse, Transform},
     error::PayloadError,
     http::{header::HeaderValue, StatusCode},
-    FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
+    web, FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
 };
-use bytes::{Bytes, BytesMut};
+use bytes::Bytes;
 use futures::{
     channel::mpsc,
     future::{err, ok, ready, Ready},
@@ -86,7 +86,7 @@ impl FromRequest for DigestVerified {
 
 impl<T, S, B> Transform<S> for VerifyDigest<T>
 where
-    T: DigestVerify + Clone + 'static,
+    T: DigestVerify + Clone + Send + 'static,
     S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>
         + 'static,
     S::Error: 'static,
@@ -108,7 +108,7 @@ type FutResult<T, E> = dyn Future<Output = Result<T, E>>;
 
 impl<T, S, B> Service for VerifyMiddleware<T, S>
 where
-    T: DigestVerify + Clone + 'static,
+    T: DigestVerify + Clone + Send + 'static,
     S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>
         + 'static,
     S::Error: 'static,
@@ -163,24 +163,29 @@ async fn verify_payload<T>(
     mut tx: mpsc::Sender<Bytes>,
 ) -> Result<(), actix_web::Error>
 where
-    T: DigestVerify + Clone + 'static,
+    T: DigestVerify + Clone + Send + 'static,
 {
-    let mut output_bytes = BytesMut::new();
-
     while let Some(res) = payload.next().await {
         let bytes = res?;
-        output_bytes.extend(bytes);
+        let bytes2 = bytes.clone();
+        verify_digest = web::block(move || {
+            verify_digest.update(&bytes2.as_ref());
+            Ok(verify_digest) as Result<T, VerifyError>
+        })
+        .await?;
 
         if tx.is_closed() {
             warn!("Payload dropped. If this was unexpected, it could be that the payload isn't required in the route this middleware is guarding");
-            return Err(VerifyError.into());
         }
+
+        tx.try_send(bytes).map_err(|_| VerifyError)?;
     }
 
-    let bytes = output_bytes.freeze();
+    let verified =
+        web::block(move || Ok(verify_digest.verify(&vec)) as Result<_, VerifyError>).await?;
 
-    if verify_digest.verify(&vec, &bytes.as_ref()) {
-        tx.try_send(bytes).map_err(|_| VerifyError.into())
+    if verified {
+        Ok(())
     } else {
         warn!("Digest could not be verified");
         Err(VerifyError.into())
diff --git a/http-signature-normalization-actix/src/digest/mod.rs b/http-signature-normalization-actix/src/digest/mod.rs
index 9812cac..8206a3b 100644
--- a/http-signature-normalization-actix/src/digest/mod.rs
+++ b/http-signature-normalization-actix/src/digest/mod.rs
@@ -33,10 +33,11 @@ pub trait DigestCreate {
 
 /// A trait for verifying digests
 pub trait DigestVerify {
-    /// Verify the payload of the request against a slice of digests
-    ///
-    /// The slice of digests should never be empty
-    fn verify(&mut self, digests: &[DigestPart], payload: &[u8]) -> bool;
+    /// Update the verifier with bytes from the request body
+    fn update(&mut self, part: &[u8]);
+
+    /// Verify the request body against the digests from the request headers
+    fn verify(&mut self, digests: &[DigestPart]) -> bool;
 }
 
 /// Extend the Sign trait with support for adding Digest Headers to the request
diff --git a/http-signature-normalization-actix/src/digest/sha2.rs b/http-signature-normalization-actix/src/digest/sha2.rs
index 6a436d0..d26960f 100644
--- a/http-signature-normalization-actix/src/digest/sha2.rs
+++ b/http-signature-normalization-actix/src/digest/sha2.rs
@@ -8,13 +8,12 @@ fn create(digest: &mut impl sha2::Digest, input: &[u8]) -> String {
     base64::encode(&digest.finalize_reset())
 }
 
-fn verify(digest: &mut impl sha2::Digest, name: &str, parts: &[DigestPart], bytes: &[u8]) -> bool {
+fn verify(digest: &mut impl sha2::Digest, name: &str, parts: &[DigestPart]) -> bool {
     if let Some(part) = parts
         .iter()
         .find(|p| p.algorithm.to_lowercase() == name.to_lowercase())
     {
         debug!("Verifying digest type, {}", name);
-        digest.update(bytes);
         let encoded = base64::encode(&digest.finalize_reset());
 
         return part.digest == encoded;
@@ -44,8 +43,12 @@ impl DigestCreate for Sha224 {
 }
 
 impl DigestVerify for Sha224 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -58,8 +61,12 @@ impl DigestCreate for Sha256 {
 }
 
 impl DigestVerify for Sha256 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -72,8 +79,12 @@ impl DigestCreate for Sha384 {
 }
 
 impl DigestVerify for Sha384 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -86,8 +97,12 @@ impl DigestCreate for Sha512 {
 }
 
 impl DigestVerify for Sha512 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -100,8 +115,12 @@ impl DigestCreate for Sha512Trunc224 {
 }
 
 impl DigestVerify for Sha512Trunc224 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -114,7 +133,11 @@ impl DigestCreate for Sha512Trunc256 {
 }
 
 impl DigestVerify for Sha512Trunc256 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha2::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
diff --git a/http-signature-normalization-actix/src/digest/sha3.rs b/http-signature-normalization-actix/src/digest/sha3.rs
index 1367370..3938f84 100644
--- a/http-signature-normalization-actix/src/digest/sha3.rs
+++ b/http-signature-normalization-actix/src/digest/sha3.rs
@@ -11,13 +11,12 @@ fn create(digest: &mut impl sha2::Digest, input: &[u8]) -> String {
     base64::encode(&digest.finalize_reset())
 }
 
-fn verify(digest: &mut impl sha2::Digest, name: &str, parts: &[DigestPart], bytes: &[u8]) -> bool {
+fn verify(digest: &mut impl sha2::Digest, name: &str, parts: &[DigestPart]) -> bool {
     if let Some(part) = parts
         .iter()
         .find(|p| p.algorithm.to_lowercase() == name.to_lowercase())
     {
         debug!("Verifying digest type, {}", name);
-        digest.update(bytes);
         let encoded = base64::encode(&digest.finalize_reset());
 
         return part.digest == encoded;
@@ -47,8 +46,12 @@ impl DigestCreate for Sha3_224 {
 }
 
 impl DigestVerify for Sha3_224 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -61,8 +64,12 @@ impl DigestCreate for Sha3_256 {
 }
 
 impl DigestVerify for Sha3_256 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -75,8 +82,12 @@ impl DigestCreate for Sha3_384 {
 }
 
 impl DigestVerify for Sha3_384 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -89,8 +100,12 @@ impl DigestCreate for Sha3_512 {
 }
 
 impl DigestVerify for Sha3_512 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -103,8 +118,12 @@ impl DigestCreate for Keccak224 {
 }
 
 impl DigestVerify for Keccak224 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -117,8 +136,12 @@ impl DigestCreate for Keccak256 {
 }
 
 impl DigestVerify for Keccak256 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -131,8 +154,12 @@ impl DigestCreate for Keccak256Full {
 }
 
 impl DigestVerify for Keccak256Full {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -145,8 +172,12 @@ impl DigestCreate for Keccak384 {
 }
 
 impl DigestVerify for Keccak384 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }
 
@@ -159,7 +190,11 @@ impl DigestCreate for Keccak512 {
 }
 
 impl DigestVerify for Keccak512 {
-    fn verify(&mut self, parts: &[DigestPart], bytes: &[u8]) -> bool {
-        verify(self, <Self as DigestCreate>::NAME, parts, bytes)
+    fn update(&mut self, part: &[u8]) {
+        sha3::Digest::update(self, part);
+    }
+
+    fn verify(&mut self, parts: &[DigestPart]) -> bool {
+        verify(self, <Self as DigestCreate>::NAME, parts)
     }
 }