diff --git a/libraries/app/api.cpp b/libraries/app/api.cpp
index 46d763e0..fc8baa19 100644
--- a/libraries/app/api.cpp
+++ b/libraries/app/api.cpp
@@ -812,5 +812,20 @@ namespace graphene { namespace app {
          return result;
     } FC_CAPTURE_AND_RETHROW( (addrs) ) }
 
+    set<public_key_type> database_api::get_required_signatures( const signed_transaction& trx, const flat_set<public_key_type>& available_keys )const
+    {
+       return trx.get_required_signatures( available_keys,
+                                           [&]( account_id_type id ){ return &id(_db).active; },
+                                           [&]( account_id_type id ){ return &id(_db).owner; },
+                                           _db.get_global_properties().parameters.max_authority_depth );
+    }
+
+    bool    database_api::verify_authority( const signed_transaction& trx )const
+    {
+       trx.verify_authority( [&]( account_id_type id ){ return &id(_db).active; },
+                             [&]( account_id_type id ){ return &id(_db).owner; },
+                              _db.get_global_properties().parameters.max_authority_depth );
+       return true;
+    }
 
 } } // graphene::app
diff --git a/libraries/app/include/graphene/app/api.hpp b/libraries/app/include/graphene/app/api.hpp
index b0fb8b75..99d707c9 100644
--- a/libraries/app/include/graphene/app/api.hpp
+++ b/libraries/app/include/graphene/app/api.hpp
@@ -302,6 +302,19 @@ namespace graphene { namespace app {
          /** @return all unclaimed balance objects for a set of addresses */
          vector<balance_object>  get_balance_objects( const vector<address>& addrs )const;
 
+
+         /**
+          *  This API will take a partially signed transaction and a set of public keys that the owner has the ability to sign for
+          *  and return the minimal subset of public keys that should add signatures to the transaction.  
+          */
+         set<public_key_type> get_required_signatures( const signed_transaction& trx, const flat_set<public_key_type>& available_keys )const;
+
+         /**
+          * @return true of the @ref trx has all of the required signatures, otherwise throws an exception
+          */
+         bool                 verify_authority( const signed_transaction& trx )const;
+
+
       private:
          /** called every time a block is applied to report the objects that were changed */
          void on_objects_changed(const vector<object_id_type>& ids);
@@ -506,6 +519,8 @@ FC_API(graphene::app::database_api,
        (get_key_references)
        (get_margin_positions)
        (get_balance_objects)
+       (get_required_signatures)
+       (verify_authority)
      )
 FC_API(graphene::app::history_api,
        (get_account_history)