diff --git a/arbiter-core/src/middleware/mod.rs b/arbiter-core/src/middleware/mod.rs
index 92954974..355559f9 100644
--- a/arbiter-core/src/middleware/mod.rs
+++ b/arbiter-core/src/middleware/mod.rs
@@ -459,6 +459,10 @@ impl Middleware for ArbiterMiddleware {
         let outcome = provider.outcome_receiver.recv()??;
 
         if let Outcome::TransactionCompleted(execution_result, receipt_data) = outcome {
+            let mut block_hasher = Sha256::new();
+            block_hasher.update(receipt_data.block_number.to_string().as_bytes());
+            let block_hash = block_hasher.finalize();
+            let block_hash = Some(H256::from_slice(&block_hash));
             match execution_result {
                 ExecutionResult::Revert { gas_used, output } => {
                     return Err(ArbiterCoreError::ExecutionRevert {
@@ -494,7 +498,7 @@ impl Middleware for ArbiterMiddleware {
                     match output {
                         Output::Create(_, address) => {
                             let tx_receipt = TransactionReceipt {
-                                block_hash: None,
+                                block_hash,
                                 block_number: Some(receipt_data.block_number),
                                 contract_address: Some(recast_address(address.unwrap())),
                                 logs: logs.clone(),
@@ -546,7 +550,7 @@ impl Middleware for ArbiterMiddleware {
                         }
                         Output::Call(_) => {
                             let tx_receipt = TransactionReceipt {
-                                block_hash: None,
+                                block_hash,
                                 block_number: Some(receipt_data.block_number),
                                 contract_address: None,
                                 logs: logs.clone(),
diff --git a/arbiter-core/tests/environment_integration.rs b/arbiter-core/tests/environment_integration.rs
index c1ccdea6..b10030ac 100644
--- a/arbiter-core/tests/environment_integration.rs
+++ b/arbiter-core/tests/environment_integration.rs
@@ -29,7 +29,7 @@ async fn receipt_data() {
     block_hasher.update(receipt.block_number.unwrap().to_string().as_bytes());
     let block_hash = block_hasher.finalize();
     let block_hash = Some(H256::from_slice(&block_hash));
-    assert_eq!(receipt.block_hash, block_hash);
+    assert_eq!(receipt.block_hash, block_hash); // panic here left side is none
     assert_eq!(receipt.status, Some(1.into()));
 
     assert!(receipt.contract_address.is_none());
diff --git a/arbiter-core/tests/middleware_integration.rs b/arbiter-core/tests/middleware_integration.rs
index bdfbee23..e9d95f42 100644
--- a/arbiter-core/tests/middleware_integration.rs
+++ b/arbiter-core/tests/middleware_integration.rs
@@ -597,7 +597,7 @@ async fn access() {
 
 #[tokio::test]
 async fn stream_with_meta() {
-    let (_, client) = startup();
+    let (_environment, client) = startup();
 
     let arbx = deploy_arbx(client.clone()).await;