diff --git a/libraries/chain/bond_evaluator.cpp b/libraries/chain/bond_evaluator.cpp
index c3108771..272866c1 100644
--- a/libraries/chain/bond_evaluator.cpp
+++ b/libraries/chain/bond_evaluator.cpp
@@ -67,21 +67,21 @@ object_id_type bond_create_offer_evaluator::do_apply( const bond_create_offer_op
 }
 
 
-object_id_type bond_cancel_offer_evaluator::do_evaluate( const bond_cancel_offer_operation& op )
+void_result bond_cancel_offer_evaluator::do_evaluate( const bond_cancel_offer_operation& op )
 {
     _offer = &op.offer_id(db());
     FC_ASSERT( op.creator == _offer->offered_by_account );
     FC_ASSERT( _offer->amount == op.refund );
-    return object_id_type();
+    return void_result();
 }
 
-object_id_type bond_cancel_offer_evaluator::do_apply( const bond_cancel_offer_operation& op )
+void_result bond_cancel_offer_evaluator::do_apply( const bond_cancel_offer_operation& op )
 {
     assert( _offer != nullptr );
     db().adjust_balance( op.creator, op.refund );
     db().adjust_core_in_orders( op.creator(db()), -op.refund );
     db().remove( *_offer );
-    return  object_id_type();
+    return  void_result();
 }
 
 object_id_type bond_accept_offer_evaluator::do_evaluate( const bond_accept_offer_operation& op )
@@ -148,7 +148,7 @@ object_id_type bond_accept_offer_evaluator::do_apply( const bond_accept_offer_op
 
 
 
-object_id_type bond_claim_collateral_evaluator::do_evaluate( const bond_claim_collateral_operation& op )
+void_result bond_claim_collateral_evaluator::do_evaluate( const bond_claim_collateral_operation& op )
 {
     _bond = &op.bond_id(db());
     auto head_time = db().get_dynamic_global_properties().time;
@@ -185,10 +185,10 @@ object_id_type bond_claim_collateral_evaluator::do_evaluate( const bond_claim_co
        FC_ASSERT( _bond->collateral == op.collateral_claimed );
        FC_ASSERT( op.payoff_amount == asset(0,_bond->borrowed.asset_id ) );
     }
-    return object_id_type();
+    return void_result();
 }
 
-object_id_type bond_claim_collateral_evaluator::do_apply( const bond_claim_collateral_operation& op )
+void_result bond_claim_collateral_evaluator::do_apply( const bond_claim_collateral_operation& op )
 {
     assert( _bond != nullptr );
 
@@ -212,7 +212,7 @@ object_id_type bond_claim_collateral_evaluator::do_apply( const bond_claim_colla
                bond.start_date = db().get_dynamic_global_properties().time;
           });
 
-    return  object_id_type();
+    return  void_result();
 }
 
 } } // graphene::chain
diff --git a/libraries/chain/global_parameters_evaluator.cpp b/libraries/chain/global_parameters_evaluator.cpp
index e8094f7d..49b05769 100644
--- a/libraries/chain/global_parameters_evaluator.cpp
+++ b/libraries/chain/global_parameters_evaluator.cpp
@@ -21,20 +21,20 @@
 
 namespace graphene { namespace chain {
 
-object_id_type global_parameters_update_evaluator::do_evaluate(const global_parameters_update_operation& o)
+void_result global_parameters_update_evaluator::do_evaluate(const global_parameters_update_operation& o)
 {
    FC_ASSERT(trx_state->_is_proposed_trx);
 
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type global_parameters_update_evaluator::do_apply(const global_parameters_update_operation& o)
+void_result global_parameters_update_evaluator::do_apply(const global_parameters_update_operation& o)
 {
    db().modify(db().get_global_properties(), [&o](global_property_object& p) {
       p.pending_parameters = o.new_parameters;
    });
 
-   return object_id_type();
+   return void_result();
 }
 
 } } // graphene::chain
diff --git a/libraries/chain/include/graphene/chain/bond_evaluator.hpp b/libraries/chain/include/graphene/chain/bond_evaluator.hpp
index 224c3527..b8114101 100644
--- a/libraries/chain/include/graphene/chain/bond_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/bond_evaluator.hpp
@@ -35,8 +35,8 @@ class bond_cancel_offer_evaluator : public evaluator<bond_cancel_offer_evaluator
     public:
         typedef bond_cancel_offer_operation operation_type;
 
-        object_id_type do_evaluate( const bond_cancel_offer_operation& op );
-        object_id_type do_apply( const bond_cancel_offer_operation& op );
+        void_result do_evaluate( const bond_cancel_offer_operation& op );
+        void_result do_apply( const bond_cancel_offer_operation& op );
 
         const bond_offer_object* _offer = nullptr;
 };
@@ -58,8 +58,8 @@ class bond_claim_collateral_evaluator : public evaluator<bond_claim_collateral_e
     public:
         typedef bond_claim_collateral_operation operation_type;
 
-        object_id_type do_evaluate( const bond_claim_collateral_operation& op );
-        object_id_type do_apply( const bond_claim_collateral_operation& op );
+        void_result do_evaluate( const bond_claim_collateral_operation& op );
+        void_result do_apply( const bond_claim_collateral_operation& op );
 
         const bond_object* _bond = nullptr;
         asset              _interest_due;
diff --git a/libraries/chain/include/graphene/chain/custom_evaluator.hpp b/libraries/chain/include/graphene/chain/custom_evaluator.hpp
index 37e34fd4..3b315c1f 100644
--- a/libraries/chain/include/graphene/chain/custom_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/custom_evaluator.hpp
@@ -27,7 +27,7 @@ namespace graphene { namespace chain {
       public:
          typedef custom_operation operation_type;
 
-         object_id_type do_evaluate( const custom_operation& o ){ return object_id_type(); }
-         object_id_type do_apply( const custom_operation& o ){ return object_id_type(); }
+         void_result do_evaluate( const custom_operation& o ){ return void_result(); }
+         void_result do_apply( const custom_operation& o ){ return void_result(); }
    };
 } }
diff --git a/libraries/chain/include/graphene/chain/global_parameters_evaluator.hpp b/libraries/chain/include/graphene/chain/global_parameters_evaluator.hpp
index 21c622c2..1c3fb771 100644
--- a/libraries/chain/include/graphene/chain/global_parameters_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/global_parameters_evaluator.hpp
@@ -26,8 +26,8 @@ class global_parameters_update_evaluator : public evaluator<global_parameters_up
    public:
       typedef global_parameters_update_operation operation_type;
 
-      object_id_type do_evaluate( const global_parameters_update_operation& o );
-      object_id_type do_apply( const global_parameters_update_operation& o );
+      void_result do_evaluate( const global_parameters_update_operation& o );
+      void_result do_apply( const global_parameters_update_operation& o );
 };
 
 } } // graphene::chain
diff --git a/libraries/chain/include/graphene/chain/proposal_evaluator.hpp b/libraries/chain/include/graphene/chain/proposal_evaluator.hpp
index 3a98b9aa..454be5ab 100644
--- a/libraries/chain/include/graphene/chain/proposal_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/proposal_evaluator.hpp
@@ -40,8 +40,8 @@ namespace graphene { namespace chain {
       public:
          typedef proposal_update_operation operation_type;
 
-         object_id_type do_evaluate( const proposal_update_operation& o );
-         object_id_type do_apply( const proposal_update_operation& o );
+         void_result do_evaluate( const proposal_update_operation& o );
+         void_result do_apply( const proposal_update_operation& o );
 
          const proposal_object* _proposal = nullptr;
          processed_transaction _processed_transaction;
@@ -54,8 +54,8 @@ namespace graphene { namespace chain {
       public:
          typedef proposal_delete_operation operation_type;
 
-         object_id_type do_evaluate( const proposal_delete_operation& o );
-         object_id_type do_apply(const proposal_delete_operation&);
+         void_result do_evaluate( const proposal_delete_operation& o );
+         void_result do_apply(const proposal_delete_operation&);
 
          const proposal_object* _proposal = nullptr;
    };
diff --git a/libraries/chain/include/graphene/chain/vesting_balance_evaluator.hpp b/libraries/chain/include/graphene/chain/vesting_balance_evaluator.hpp
index 4747184d..09c49607 100644
--- a/libraries/chain/include/graphene/chain/vesting_balance_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/vesting_balance_evaluator.hpp
@@ -38,8 +38,8 @@ class vesting_balance_withdraw_evaluator : public evaluator<vesting_balance_with
     public:
         typedef vesting_balance_withdraw_operation operation_type;
 
-        object_id_type do_evaluate( const vesting_balance_withdraw_operation& op );
-        object_id_type do_apply( const vesting_balance_withdraw_operation& op );
+        void_result do_evaluate( const vesting_balance_withdraw_operation& op );
+        void_result do_apply( const vesting_balance_withdraw_operation& op );
 };
 
 } } // graphene::chain
diff --git a/libraries/chain/include/graphene/chain/witness_evaluator.hpp b/libraries/chain/include/graphene/chain/witness_evaluator.hpp
index 265cce21..8476c096 100644
--- a/libraries/chain/include/graphene/chain/witness_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/witness_evaluator.hpp
@@ -35,8 +35,8 @@ namespace graphene { namespace chain {
       public:
          typedef witness_withdraw_pay_operation operation_type;
 
-         object_id_type do_evaluate( const operation_type& o );
-         object_id_type do_apply( const operation_type& o );
+         void_result do_evaluate( const operation_type& o );
+         void_result do_apply( const operation_type& o );
 
          const witness_object* witness;
          const account_object* to_account;
diff --git a/libraries/chain/proposal_evaluator.cpp b/libraries/chain/proposal_evaluator.cpp
index 18d08d06..f365263f 100644
--- a/libraries/chain/proposal_evaluator.cpp
+++ b/libraries/chain/proposal_evaluator.cpp
@@ -73,7 +73,7 @@ object_id_type proposal_create_evaluator::do_apply(const proposal_create_operati
    return proposal.id;
 }
 
-object_id_type proposal_update_evaluator::do_evaluate(const proposal_update_operation& o)
+void_result proposal_update_evaluator::do_evaluate(const proposal_update_operation& o)
 {
    database& d = db();
 
@@ -102,10 +102,10 @@ object_id_type proposal_update_evaluator::do_evaluate(const proposal_update_oper
       FC_ASSERT( trx_state->signed_by(id) || trx_state->_skip_authority_check );
    }
 
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type proposal_update_evaluator::do_apply(const proposal_update_operation& o)
+void_result proposal_update_evaluator::do_apply(const proposal_update_operation& o)
 {
    database& d = db();
 
@@ -128,7 +128,7 @@ object_id_type proposal_update_evaluator::do_apply(const proposal_update_operati
    // If the proposal has a review period, don't bother attempting to authorize/execute it.
    // Proposals with a review period may never be executed except at their expiration.
    if( _proposal->review_period_time )
-      return object_id_type();
+      return void_result();
 
    if( _proposal->is_authorized_to_execute(&d) )
    {
@@ -143,10 +143,10 @@ object_id_type proposal_update_evaluator::do_apply(const proposal_update_operati
       }
    }
 
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type proposal_delete_evaluator::do_evaluate(const proposal_delete_operation& o)
+void_result proposal_delete_evaluator::do_evaluate(const proposal_delete_operation& o)
 {
    database& d = db();
 
@@ -158,14 +158,14 @@ object_id_type proposal_delete_evaluator::do_evaluate(const proposal_delete_oper
               "Provided authority is not authoritative for this proposal.",
               ("provided", o.fee_paying_account)("required", *required_approvals));
 
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type proposal_delete_evaluator::do_apply(const proposal_delete_operation&)
+void_result proposal_delete_evaluator::do_apply(const proposal_delete_operation&)
 {
    db().remove(*_proposal);
 
-   return object_id_type();
+   return void_result();
 }
 
 } } // graphene::chain
diff --git a/libraries/chain/vesting_balance_evaluator.cpp b/libraries/chain/vesting_balance_evaluator.cpp
index e044b515..af521f80 100644
--- a/libraries/chain/vesting_balance_evaluator.cpp
+++ b/libraries/chain/vesting_balance_evaluator.cpp
@@ -69,7 +69,7 @@ object_id_type vesting_balance_create_evaluator::do_apply( const vesting_balance
    return vbo.id;
 }
 
-object_id_type vesting_balance_withdraw_evaluator::do_evaluate( const vesting_balance_withdraw_operation& op )
+void_result vesting_balance_withdraw_evaluator::do_evaluate( const vesting_balance_withdraw_operation& op )
 {
    const database& d = db();
    const time_point_sec now = d.head_block_time();
@@ -81,10 +81,10 @@ object_id_type vesting_balance_withdraw_evaluator::do_evaluate( const vesting_ba
 
    /* const account_object& owner_account = */ op.owner( d );
    // TODO: Check asset authorizations and withdrawals
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type vesting_balance_withdraw_evaluator::do_apply( const vesting_balance_withdraw_operation& op )
+void_result vesting_balance_withdraw_evaluator::do_apply( const vesting_balance_withdraw_operation& op )
 {
    database& d = db();
    const time_point_sec now = d.head_block_time();
@@ -103,7 +103,7 @@ object_id_type vesting_balance_withdraw_evaluator::do_apply( const vesting_balan
    d.adjust_balance( op.owner, op.amount );
 
    // TODO: Check asset authorizations and withdrawals
-   return object_id_type();
+   return void_result();
 }
 
 } } // graphene::chain
diff --git a/libraries/chain/witness_evaluator.cpp b/libraries/chain/witness_evaluator.cpp
index b8f9a19f..89befa44 100644
--- a/libraries/chain/witness_evaluator.cpp
+++ b/libraries/chain/witness_evaluator.cpp
@@ -45,7 +45,7 @@ object_id_type witness_create_evaluator::do_apply( const witness_create_operatio
    return new_witness_object.id;
 }
 
-object_id_type witness_withdraw_pay_evaluator::do_evaluate(const witness_withdraw_pay_evaluator::operation_type& o)
+void_result witness_withdraw_pay_evaluator::do_evaluate(const witness_withdraw_pay_evaluator::operation_type& o)
 {
    database& d = db();
 
@@ -55,10 +55,10 @@ object_id_type witness_withdraw_pay_evaluator::do_evaluate(const witness_withdra
               ("w", o.amount)("e", witness->accumulated_income) );
    to_account = &d.get(o.to_account);
 
-   return object_id_type();
+   return void_result();
 }
 
-object_id_type witness_withdraw_pay_evaluator::do_apply(const witness_withdraw_pay_evaluator::operation_type& o)
+void_result witness_withdraw_pay_evaluator::do_apply(const witness_withdraw_pay_evaluator::operation_type& o)
 {
    database& d = db();
 
@@ -68,7 +68,7 @@ object_id_type witness_withdraw_pay_evaluator::do_apply(const witness_withdraw_p
       w.accumulated_income -= o.amount;
    });
 
-   return object_id_type();
+   return void_result();
 }
 
 } } // graphene::chain
diff --git a/libraries/fc b/libraries/fc
index 10e74740..dde8ed9d 160000
--- a/libraries/fc
+++ b/libraries/fc
@@ -1 +1 @@
-Subproject commit 10e747409c5d656e794cb2e10cc51d5e31978cf1
+Subproject commit dde8ed9d7ab49807f2556488c0815f3741b11e00