diff --git a/application/scans/corda-application-5.2.0.yaml b/application/scans/corda-application-5.2.0.yaml
index 28f677c51f..6c487309f2 100644
--- a/application/scans/corda-application-5.2.0.yaml
+++ b/application/scans/corda-application-5.2.0.yaml
@@ -1463,7 +1463,7 @@ net.corda.v5.application.messaging.FlowSession:
           type: Object
 net.corda.v5.application.messaging.FlowSessionConfiguration:
   annotations: []
-  type: public class
+  type: public final class
   extends: null
   implements: []
   interface: false
@@ -1480,7 +1480,7 @@ net.corda.v5.application.messaging.FlowSessionConfiguration:
       returnType: boolean
 net.corda.v5.application.messaging.FlowSessionConfiguration$Builder:
   annotations: []
-  type: public static class
+  type: public static final class
   extends: null
   implements: []
   interface: false
@@ -1619,7 +1619,7 @@ net.corda.v5.application.persistence.ParameterizedQuery:
           type: String
         value:
           annotation:
-            - NotNull
+            - Nullable
           type: Object
     setParameters:
       annotations:
diff --git a/gradle.properties b/gradle.properties
index ff3f0c1f1f..3661308479 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,7 +5,7 @@ cordaProductVersion = 5.2.0
 # NOTE: update this each time this module contains a breaking change
 ## NOTE: currently this is a top level revision, so all API versions will line up, but this could be moved to
 ##   a per module property in which case module versions can change independently.
-cordaApiRevision = 22
+cordaApiRevision = 23
 
 # Main
 kotlin.stdlib.default.dependency = false
diff --git a/ledger/ledger-utxo/scans/corda-ledger-utxo-5.2.0.yaml b/ledger/ledger-utxo/scans/corda-ledger-utxo-5.2.0.yaml
index 273a6c7a42..348f44719f 100644
--- a/ledger/ledger-utxo/scans/corda-ledger-utxo-5.2.0.yaml
+++ b/ledger/ledger-utxo/scans/corda-ledger-utxo-5.2.0.yaml
@@ -839,7 +839,7 @@ net.corda.v5.ledger.utxo.query.VaultNamedParameterizedQuery:
           type: String
         value:
           annotation:
-            - NotNull
+            - Nullable
           type: Object
     setParameters:
       annotations:
@@ -1670,6 +1670,11 @@ net.corda.v5.ledger.utxo.transaction.UtxoSignedTransaction:
         referenceStateAndRefs:
           annotation: []
           type: java.util.List<net.corda.v5.ledger.utxo.StateAndRef<?>>
+    verifySignatorySignatures:
+      annotations: []
+      default: false
+      type: public abstract
+      returnType: void
 net.corda.v5.ledger.utxo.transaction.UtxoTransactionBuilder:
   annotations:
     - DoNotImplement
diff --git a/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/transaction/UtxoSignedTransaction.java b/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/transaction/UtxoSignedTransaction.java
index f46eb02476..9398b665d5 100644
--- a/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/transaction/UtxoSignedTransaction.java
+++ b/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/transaction/UtxoSignedTransaction.java
@@ -5,6 +5,7 @@
 import net.corda.v5.base.annotations.DoNotImplement;
 import net.corda.v5.base.annotations.Suspendable;
 import net.corda.v5.base.types.MemberX500Name;
+import net.corda.v5.ledger.common.transaction.TransactionSignatureException;
 import net.corda.v5.ledger.common.transaction.TransactionWithMetadata;
 import net.corda.v5.ledger.utxo.Command;
 import net.corda.v5.ledger.utxo.StateAndRef;
@@ -132,4 +133,12 @@ public interface UtxoSignedTransaction extends TransactionWithMetadata {
     @NotNull
     @Suspendable
     UtxoLedgerTransaction toLedgerTransaction(List<StateAndRef<?>> inputStateAndRefs, List<StateAndRef<?>> referenceStateAndRefs);
+
+    /**
+     * Verify the signatories' signatures and check if there are any missing one.
+     * It ignores the non-signatory signatures! (including the notary's)
+     *
+     * @throws TransactionSignatureException if any signatures are missing or invalid.
+     */
+    void verifySignatorySignatures();
 }