diff --git a/src/bank.rs b/src/bank.rs
index 0d4c1178fb..2942c59247 100644
--- a/src/bank.rs
+++ b/src/bank.rs
@@ -557,6 +557,10 @@ impl Bank {
         Accounts::load_slow(&accounts, pubkey)
     }
 
+    pub fn get_account_modified_since_parent(&self, pubkey: &Pubkey) -> Option<Account> {
+        Accounts::load_slow(&[&self.accounts], pubkey)
+    }
+
     pub fn transaction_count(&self) -> u64 {
         self.accounts.transaction_count()
     }
diff --git a/src/rpc_pubsub.rs b/src/rpc_pubsub.rs
index 27387a8315..00a6306741 100644
--- a/src/rpc_pubsub.rs
+++ b/src/rpc_pubsub.rs
@@ -200,24 +200,16 @@ mod tests {
     use std::time::Duration;
     use tokio::prelude::{Async, Stream};
 
-    pub fn process_transaction_and_notify(
-        bank: &Bank,
+    fn process_transaction_and_notify(
+        bank: &Arc<Bank>,
         tx: &Transaction,
         subscriptions: &RpcSubscriptions,
-    ) -> bank::Result<()> {
+    ) -> bank::Result<Arc<Bank>> {
         bank.process_transaction(tx)?;
+        subscriptions.notify_subscribers(&bank);
 
-        for pubkey in &tx.account_keys {
-            if let Some(account) = &bank.get_account(pubkey) {
-                subscriptions.check_account(pubkey, account);
-            }
-        }
-
-        let signature = &tx.signatures[0];
-        let status = bank.get_signature_status(signature).unwrap();
-        subscriptions.check_signature(signature, &status);
-
-        Ok(())
+        // Simulate a block boundary
+        Ok(Arc::new(Bank::new_from_parent(&bank)))
     }
 
     fn create_session() -> Arc<Session> {
@@ -323,7 +315,7 @@ mod tests {
             budget_program_id,
             0,
         );
-        process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
+        let arc_bank = process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
 
         let tx = SystemTransaction::new_program_account(
             &alice,
@@ -335,7 +327,7 @@ mod tests {
             0,
         );
 
-        process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
+        let arc_bank = process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
 
         // Test signature confirmation notification #1
         let string = receiver.poll();
@@ -363,7 +355,6 @@ mod tests {
         if let Async::Ready(Some(response)) = string.unwrap() {
             assert_eq!(serde_json::to_string(&expected).unwrap(), response);
         }
-
         let tx = BudgetTransaction::new_when_signed(
             &contract_funds,
             bob_pubkey,
@@ -373,7 +364,7 @@ mod tests {
             50,
             last_id,
         );
-        process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
+        let arc_bank = process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
         sleep(Duration::from_millis(200));
 
         // Test signature confirmation notification #2
@@ -401,7 +392,7 @@ mod tests {
         }
 
         let tx = SystemTransaction::new_account(&alice, witness.pubkey(), 1, last_id, 0);
-        process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
+        let arc_bank = process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
         sleep(Duration::from_millis(200));
         let tx = BudgetTransaction::new_signature(
             &witness,
@@ -409,7 +400,7 @@ mod tests {
             bob_pubkey,
             last_id,
         );
-        process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
+        let arc_bank = process_transaction_and_notify(&arc_bank, &tx, &rpc.subscriptions).unwrap();
         sleep(Duration::from_millis(200));
 
         let expected_userdata = arc_bank
diff --git a/src/rpc_service.rs b/src/rpc_service.rs
index 5f9a796aad..2af5e2e0ed 100644
--- a/src/rpc_service.rs
+++ b/src/rpc_service.rs
@@ -5,7 +5,6 @@ use crate::cluster_info::ClusterInfo;
 use crate::rpc::*;
 use crate::service::Service;
 use crate::storage_stage::StorageState;
-use bs58;
 use jsonrpc_core::MetaIoHandler;
 use jsonrpc_http_server::{hyper, AccessControlAllowOrigin, DomainsValidation, ServerBuilder};
 use std::net::SocketAddr;
diff --git a/src/rpc_subscriptions.rs b/src/rpc_subscriptions.rs
index 88ce743eb1..0ba9be271d 100644
--- a/src/rpc_subscriptions.rs
+++ b/src/rpc_subscriptions.rs
@@ -1,6 +1,6 @@
 //! The `pubsub` module implements a threaded subscription service on client RPC request
 
-use crate::bank::{self, BankError};
+use crate::bank::{self, Bank, BankError};
 use crate::rpc_status::RpcSignatureStatus;
 use jsonrpc_core::futures::Future;
 use jsonrpc_pubsub::typed::Sink;
@@ -116,12 +116,34 @@ impl RpcSubscriptions {
         });
         found
     }
+
+    /// Notify subscribers of changes to any accounts or new signatures since
+    /// the bank's last checkpoint.
+    pub fn notify_subscribers(&self, bank: &Bank) {
+        let pubkeys: Vec<_> = {
+            let subs = self.account_subscriptions.read().unwrap();
+            subs.keys().cloned().collect()
+        };
+        for pubkey in &pubkeys {
+            if let Some(account) = &bank.get_account_modified_since_parent(pubkey) {
+                self.check_account(pubkey, account);
+            }
+        }
+
+        let signatures: Vec<_> = {
+            let subs = self.signature_subscriptions.read().unwrap();
+            subs.keys().cloned().collect()
+        };
+        for signature in &signatures {
+            let status = bank.get_signature_status(signature).unwrap();
+            self.check_signature(signature, &status);
+        }
+    }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::bank::Bank;
     use crate::genesis_block::GenesisBlock;
     use jsonrpc_pubsub::typed::Subscriber;
     use solana_sdk::budget_program;
@@ -155,7 +177,7 @@ mod tests {
 
         assert!(subscriptions
             .account_subscriptions
-            .write()
+            .read()
             .unwrap()
             .contains_key(&alice.pubkey()));
 
@@ -170,7 +192,7 @@ mod tests {
         subscriptions.remove_account_subscription(&sub_id);
         assert!(!subscriptions
             .account_subscriptions
-            .write()
+            .read()
             .unwrap()
             .contains_key(&alice.pubkey()));
     }
@@ -193,7 +215,7 @@ mod tests {
 
         assert!(subscriptions
             .signature_subscriptions
-            .write()
+            .read()
             .unwrap()
             .contains_key(&signature));
 
@@ -207,7 +229,7 @@ mod tests {
         subscriptions.remove_signature_subscription(&sub_id);
         assert!(!subscriptions
             .signature_subscriptions
-            .write()
+            .read()
             .unwrap()
             .contains_key(&signature));
     }