diff --git a/src/proto_alpha/lib_client/operation_result.ml b/src/proto_alpha/lib_client/operation_result.ml
index c15b03b0a..ab97ffa94 100644
--- a/src/proto_alpha/lib_client/operation_result.ml
+++ b/src/proto_alpha/lib_client/operation_result.ml
@@ -107,6 +107,7 @@ let pp_manager_operation_content
 let pp_balance_updates ppf = function
   | [] -> ()
   | balance_updates ->
+      let open Delegate in
       let balance_updates =
         List.map (fun (balance, update) ->
             let balance = match balance with
diff --git a/src/proto_alpha/lib_protocol/src/alpha_context.mli b/src/proto_alpha/lib_protocol/src/alpha_context.mli
index a8ed8239e..26e92e8bc 100644
--- a/src/proto_alpha/lib_protocol/src/alpha_context.mli
+++ b/src/proto_alpha/lib_protocol/src/alpha_context.mli
@@ -594,6 +594,22 @@ end
 
 module Delegate : sig
 
+  type balance =
+    | Contract of Contract.t
+    | Rewards of Signature.Public_key_hash.t * Cycle.t
+    | Fees of Signature.Public_key_hash.t * Cycle.t
+    | Deposits of Signature.Public_key_hash.t * Cycle.t
+
+  type balance_update =
+    | Debited of Tez.t
+    | Credited of Tez.t
+
+  type balance_updates = (balance * balance_update) list
+
+  val balance_updates_encoding : balance_updates Data_encoding.t
+
+  val cleanup_balance_updates : balance_updates -> balance_updates
+
   val get: context -> Contract.t -> public_key_hash option tzresult Lwt.t
 
   val set:
diff --git a/src/proto_alpha/lib_protocol/src/apply.ml b/src/proto_alpha/lib_protocol/src/apply.ml
index 1468ba359..73e9eca44 100644
--- a/src/proto_alpha/lib_protocol/src/apply.ml
+++ b/src/proto_alpha/lib_protocol/src/apply.ml
@@ -363,7 +363,7 @@ let apply_manager_operation_content :
               Transaction_result
                 { storage = None ;
                   balance_updates =
-                    cleanup_balance_updates
+                    Delegate.cleanup_balance_updates
                       [ Contract source, Debited amount ;
                         Contract destination, Credited amount ] ;
                   originated_contracts = [] ;
@@ -397,7 +397,7 @@ let apply_manager_operation_content :
               Transaction_result
                 { storage = Some storage ;
                   balance_updates =
-                    cleanup_balance_updates
+                    Delegate.cleanup_balance_updates
                       [ Contract payer, Debited fees ;
                         Contract source, Debited amount ;
                         Contract destination, Credited amount ] ;
@@ -437,7 +437,7 @@ let apply_manager_operation_content :
         let result =
           Origination_result
             { balance_updates =
-                cleanup_balance_updates
+                Delegate.cleanup_balance_updates
                   [ Contract payer, Debited all_fees ;
                     Contract source, Debited credit ;
                     Contract contract, Credited credit ] ;
@@ -543,7 +543,7 @@ let rec mark_skipped
       Single_result
         (Manager_operation_result
            { balance_updates =
-               cleanup_balance_updates
+               Delegate.cleanup_balance_updates
                  [ Contract source, Debited fee ;
                    Fees (baker, level.cycle), Credited fee ] ;
              operation_result = Skipped (manager_kind op.operation) ;
@@ -552,7 +552,7 @@ let rec mark_skipped
       Cons_result
         (Manager_operation_result {
             balance_updates =
-              cleanup_balance_updates
+              Delegate.cleanup_balance_updates
                 [ Contract source, Debited fee ;
                   Fees (baker, level.cycle), Credited fee ] ;
             operation_result = Skipped (manager_kind op.operation) ;
@@ -586,7 +586,7 @@ let rec apply_manager_contents_list_rec
         let result =
           Manager_operation_result {
             balance_updates =
-              cleanup_balance_updates
+              Delegate.cleanup_balance_updates
                 [ Contract source, Debited fee ;
                   Fees (baker, level.cycle), Credited fee ] ;
             operation_result ;
@@ -600,7 +600,7 @@ let rec apply_manager_contents_list_rec
             let result =
               Manager_operation_result {
                 balance_updates =
-                  cleanup_balance_updates
+                  Delegate.cleanup_balance_updates
                     [ Contract source, Debited fee ;
                       Fees (baker, level.cycle), Credited fee ] ;
                 operation_result ;
@@ -611,7 +611,7 @@ let rec apply_manager_contents_list_rec
             let result =
               Manager_operation_result {
                 balance_updates =
-                  cleanup_balance_updates
+                  Delegate.cleanup_balance_updates
                     [ Contract source, Debited fee ;
                       Fees (baker, level.cycle), Credited fee ] ;
                 operation_result ;
diff --git a/src/proto_alpha/lib_protocol/src/apply_results.ml b/src/proto_alpha/lib_protocol/src/apply_results.ml
index 3821aa906..88403afb0 100644
--- a/src/proto_alpha/lib_protocol/src/apply_results.ml
+++ b/src/proto_alpha/lib_protocol/src/apply_results.ml
@@ -25,98 +25,18 @@ let error_encoding =
              json)
     ~binary:Error_monad.error_encoding
 
-type balance =
-  | Contract of Contract.t
-  | Rewards of Signature.Public_key_hash.t * Cycle.t
-  | Fees of Signature.Public_key_hash.t * Cycle.t
-  | Deposits of Signature.Public_key_hash.t * Cycle.t
-
-let balance_encoding =
-  def "operation_metadata.alpha.balance" @@
-  union
-    [ case (Tag 0)
-        ~title:"Contract"
-        (obj2
-           (req "kind" (constant "contract"))
-           (req "contract" Contract.encoding))
-        (function Contract c -> Some ((), c) | _ -> None )
-        (fun ((), c) -> (Contract c)) ;
-      case (Tag 1)
-        ~title:"Rewards"
-        (obj4
-           (req "kind" (constant "freezer"))
-           (req "category" (constant "rewards"))
-           (req "delegate" Signature.Public_key_hash.encoding)
-           (req "level" Cycle.encoding))
-        (function Rewards (d, l) -> Some ((), (), d, l) | _ -> None)
-        (fun ((), (), d, l) -> Rewards (d, l)) ;
-      case (Tag 2)
-        ~title:"Fees"
-        (obj4
-           (req "kind" (constant "freezer"))
-           (req "category" (constant "fees"))
-           (req "delegate" Signature.Public_key_hash.encoding)
-           (req "level" Cycle.encoding))
-        (function Fees (d, l) -> Some ((), (), d, l) | _ -> None)
-        (fun ((), (), d, l) -> Fees (d, l)) ;
-      case (Tag 3)
-        ~title:"Deposits"
-        (obj4
-           (req "kind" (constant "freezer"))
-           (req "category" (constant "deposits"))
-           (req "delegate" Signature.Public_key_hash.encoding)
-           (req "level" Cycle.encoding))
-        (function Deposits (d, l) -> Some ((), (), d, l) | _ -> None)
-        (fun ((), (), d, l) -> Deposits (d, l)) ]
-
-type balance_update =
-  | Debited of Tez.t
-  | Credited of Tez.t
-
-let balance_update_encoding =
-  def "operation_metadata.alpha.balance_update" @@
-  obj1
-    (req "change"
-       (conv
-          (function
-            | Credited v -> Tez.to_mutez v
-            | Debited v -> Int64.neg (Tez.to_mutez v))
-          (Json.wrap_error @@
-           fun v ->
-           if Compare.Int64.(v < 0L) then
-             match Tez.of_mutez (Int64.neg v) with
-             | Some v -> Debited v
-             | None -> failwith "Qty.of_mutez"
-           else
-             match Tez.of_mutez v with
-             | Some v -> Credited v
-             | None -> failwith "Qty.of_mutez")
-          int64))
-
-type balance_updates = (balance * balance_update) list
-
-let cleanup_balance_updates balance_updates =
-  List.filter
-    (fun (_, (Credited update | Debited update)) ->
-       not (Tez.equal update Tez.zero))
-    balance_updates
-
-let balance_updates_encoding =
-  def "operation_metadata.alpha.balance_updates" @@
-  list (merge_objs balance_encoding balance_update_encoding)
-
 type _ successful_manager_operation_result =
   | Reveal_result : Kind.reveal successful_manager_operation_result
   | Transaction_result :
       { storage : Script.expr option ;
-        balance_updates : balance_updates ;
+        balance_updates : Delegate.balance_updates ;
         originated_contracts : Contract.t list ;
         consumed_gas : Z.t ;
         storage_size : Z.t ;
         paid_storage_size_diff : Z.t ;
       } -> Kind.transaction successful_manager_operation_result
   | Origination_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         originated_contracts : Contract.t list ;
         consumed_gas : Z.t ;
         storage_size : Z.t ;
@@ -229,7 +149,7 @@ module Manager_result = struct
       ~encoding:
         (obj6
            (opt "storage" Script.expr_encoding)
-           (dft "balance_updates" balance_updates_encoding [])
+           (dft "balance_updates" Delegate.balance_updates_encoding [])
            (dft "originated_contracts" (list Contract.encoding) [])
            (dft "consumed_gas" z Z.zero)
            (dft "storage_size" z Z.zero)
@@ -267,7 +187,7 @@ module Manager_result = struct
       ~op_case: Operation.Encoding.Manager_operations.origination_case
       ~encoding:
         (obj5
-           (dft "balance_updates" balance_updates_encoding [])
+           (dft "balance_updates" Delegate.balance_updates_encoding [])
            (dft "originated_contracts" (list Contract.encoding) [])
            (dft "consumed_gas" z Z.zero)
            (dft "storage_size" z Z.zero)
@@ -355,22 +275,22 @@ let internal_operation_result_encoding :
 
 type 'kind contents_result =
   | Endorsement_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         delegate : Signature.Public_key_hash.t ;
         slots: int list ;
       } -> Kind.endorsement contents_result
   | Seed_nonce_revelation_result :
-      balance_updates -> Kind.seed_nonce_revelation contents_result
+      Delegate.balance_updates -> Kind.seed_nonce_revelation contents_result
   | Double_endorsement_evidence_result :
-      balance_updates -> Kind.double_endorsement_evidence contents_result
+      Delegate.balance_updates -> Kind.double_endorsement_evidence contents_result
   | Double_baking_evidence_result :
-      balance_updates -> Kind.double_baking_evidence contents_result
+      Delegate.balance_updates -> Kind.double_baking_evidence contents_result
   | Activate_account_result :
-      balance_updates -> Kind.activate_account contents_result
+      Delegate.balance_updates -> Kind.activate_account contents_result
   | Proposals_result : Kind.proposals contents_result
   | Ballot_result : Kind.ballot contents_result
   | Manager_operation_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         operation_result : 'kind manager_operation_result ;
         internal_operation_results : packed_internal_operation_result list ;
       } -> 'kind Kind.manager contents_result
@@ -422,7 +342,7 @@ module Encoding = struct
       op_case = Operation.Encoding.endorsement_case ;
       encoding =
         (obj3
-           (req "balance_updates" balance_updates_encoding)
+           (req "balance_updates" Delegate.balance_updates_encoding)
            (req "delegate" Signature.Public_key_hash.encoding)
            (req "slots" (list uint8)));
       select =
@@ -447,7 +367,7 @@ module Encoding = struct
       op_case = Operation.Encoding.seed_nonce_revelation_case ;
       encoding =
         (obj1
-           (req "balance_updates" balance_updates_encoding)) ;
+           (req "balance_updates" Delegate.balance_updates_encoding)) ;
       select =
         (function
           | Contents_result (Seed_nonce_revelation_result _ as op) -> Some op
@@ -465,7 +385,7 @@ module Encoding = struct
       op_case = Operation.Encoding.double_endorsement_evidence_case ;
       encoding =
         (obj1
-           (req "balance_updates" balance_updates_encoding)) ;
+           (req "balance_updates" Delegate.balance_updates_encoding)) ;
       select =
         (function
           | Contents_result (Double_endorsement_evidence_result _ as op) -> Some op
@@ -484,7 +404,7 @@ module Encoding = struct
       op_case = Operation.Encoding.double_baking_evidence_case ;
       encoding =
         (obj1
-           (req "balance_updates" balance_updates_encoding)) ;
+           (req "balance_updates" Delegate.balance_updates_encoding)) ;
       select =
         (function
           | Contents_result (Double_baking_evidence_result _ as op) -> Some op
@@ -503,7 +423,7 @@ module Encoding = struct
       op_case = Operation.Encoding.activate_account_case ;
       encoding =
         (obj1
-           (req "balance_updates" balance_updates_encoding)) ;
+           (req "balance_updates" Delegate.balance_updates_encoding)) ;
       select =
         (function
           | Contents_result (Activate_account_result _ as op) -> Some op
@@ -557,7 +477,7 @@ module Encoding = struct
       op_case = Operation.Encoding.Case op_case ;
       encoding =
         (obj3
-           (req "balance_updates" balance_updates_encoding)
+           (req "balance_updates" Delegate.balance_updates_encoding)
            (req "operation_result" res_case.t)
            (dft "internal_operation_results"
               (list internal_operation_result_encoding) [])) ;
diff --git a/src/proto_alpha/lib_protocol/src/apply_results.mli b/src/proto_alpha/lib_protocol/src/apply_results.mli
index 43852c38c..9889e3986 100644
--- a/src/proto_alpha/lib_protocol/src/apply_results.mli
+++ b/src/proto_alpha/lib_protocol/src/apply_results.mli
@@ -14,24 +14,6 @@
 
 open Alpha_context
 
-(** Places where tezzies can be found in the ledger's state. *)
-type balance =
-  | Contract of Contract.t
-  | Rewards of Signature.Public_key_hash.t * Cycle.t
-  | Fees of Signature.Public_key_hash.t * Cycle.t
-  | Deposits of Signature.Public_key_hash.t * Cycle.t
-
-(** A credit or debit of tezzies to a balance. *)
-type balance_update =
-  | Debited of Tez.t
-  | Credited of Tez.t
-
-(** A list of balance updates. Duplicates may happen. *)
-type balance_updates = (balance * balance_update) list
-
-(** Remove zero-valued balances from a list of updates. *)
-val cleanup_balance_updates : balance_updates -> balance_updates
-
 (** Result of applying a {!Operation.t}. Follows the same structure. *)
 type 'kind operation_metadata = {
   contents: 'kind contents_result_list ;
@@ -54,22 +36,22 @@ and packed_contents_result_list =
 (** Result of applying an {!Operation.contents}. Follows the same structure. *)
 and 'kind contents_result =
   | Endorsement_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         delegate : Signature.Public_key_hash.t ;
         slots: int list ;
       } -> Kind.endorsement contents_result
   | Seed_nonce_revelation_result :
-      balance_updates -> Kind.seed_nonce_revelation contents_result
+      Delegate.balance_updates -> Kind.seed_nonce_revelation contents_result
   | Double_endorsement_evidence_result :
-      balance_updates -> Kind.double_endorsement_evidence contents_result
+      Delegate.balance_updates -> Kind.double_endorsement_evidence contents_result
   | Double_baking_evidence_result :
-      balance_updates -> Kind.double_baking_evidence contents_result
+      Delegate.balance_updates -> Kind.double_baking_evidence contents_result
   | Activate_account_result :
-      balance_updates -> Kind.activate_account contents_result
+      Delegate.balance_updates -> Kind.activate_account contents_result
   | Proposals_result : Kind.proposals contents_result
   | Ballot_result : Kind.ballot contents_result
   | Manager_operation_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         operation_result : 'kind manager_operation_result ;
         internal_operation_results : packed_internal_operation_result list ;
       } -> 'kind Kind.manager contents_result
@@ -91,14 +73,14 @@ and _ successful_manager_operation_result =
   | Reveal_result : Kind.reveal successful_manager_operation_result
   | Transaction_result :
       { storage : Script.expr option ;
-        balance_updates : balance_updates ;
+        balance_updates : Delegate.balance_updates ;
         originated_contracts : Contract.t list ;
         consumed_gas : Z.t ;
         storage_size : Z.t ;
         paid_storage_size_diff : Z.t ;
       } -> Kind.transaction successful_manager_operation_result
   | Origination_result :
-      { balance_updates : balance_updates ;
+      { balance_updates : Delegate.balance_updates ;
         originated_contracts : Contract.t list ;
         consumed_gas : Z.t ;
         storage_size : Z.t ;
diff --git a/src/proto_alpha/lib_protocol/src/delegate_storage.ml b/src/proto_alpha/lib_protocol/src/delegate_storage.ml
index 6de896ace..185ec8d48 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_storage.ml
+++ b/src/proto_alpha/lib_protocol/src/delegate_storage.ml
@@ -7,6 +7,89 @@
 (*                                                                        *)
 (**************************************************************************)
 
+type balance =
+  | Contract of Contract_repr.t
+  | Rewards of Signature.Public_key_hash.t * Cycle_repr.t
+  | Fees of Signature.Public_key_hash.t * Cycle_repr.t
+  | Deposits of Signature.Public_key_hash.t * Cycle_repr.t
+
+let balance_encoding =
+  let open Data_encoding in
+  def "operation_metadata.alpha.balance" @@
+  union
+    [ case (Tag 0)
+        ~title:"Contract"
+        (obj2
+           (req "kind" (constant "contract"))
+           (req "contract" Contract_repr.encoding))
+        (function Contract c -> Some ((), c) | _ -> None )
+        (fun ((), c) -> (Contract c)) ;
+      case (Tag 1)
+        ~title:"Rewards"
+        (obj4
+           (req "kind" (constant "freezer"))
+           (req "category" (constant "rewards"))
+           (req "delegate" Signature.Public_key_hash.encoding)
+           (req "level" Cycle_repr.encoding))
+        (function Rewards (d, l) -> Some ((), (), d, l) | _ -> None)
+        (fun ((), (), d, l) -> Rewards (d, l)) ;
+      case (Tag 2)
+        ~title:"Fees"
+        (obj4
+           (req "kind" (constant "freezer"))
+           (req "category" (constant "fees"))
+           (req "delegate" Signature.Public_key_hash.encoding)
+           (req "level" Cycle_repr.encoding))
+        (function Fees (d, l) -> Some ((), (), d, l) | _ -> None)
+        (fun ((), (), d, l) -> Fees (d, l)) ;
+      case (Tag 3)
+        ~title:"Deposits"
+        (obj4
+           (req "kind" (constant "freezer"))
+           (req "category" (constant "deposits"))
+           (req "delegate" Signature.Public_key_hash.encoding)
+           (req "level" Cycle_repr.encoding))
+        (function Deposits (d, l) -> Some ((), (), d, l) | _ -> None)
+        (fun ((), (), d, l) -> Deposits (d, l)) ]
+
+type balance_update =
+  | Debited of Tez_repr.t
+  | Credited of Tez_repr.t
+
+let balance_update_encoding =
+  let open Data_encoding in
+  def "operation_metadata.alpha.balance_update" @@
+  obj1
+    (req "change"
+       (conv
+          (function
+            | Credited v -> Tez_repr.to_mutez v
+            | Debited v -> Int64.neg (Tez_repr.to_mutez v))
+          (Json.wrap_error @@
+           fun v ->
+           if Compare.Int64.(v < 0L) then
+             match Tez_repr.of_mutez (Int64.neg v) with
+             | Some v -> Debited v
+             | None -> failwith "Qty.of_mutez"
+           else
+             match Tez_repr.of_mutez v with
+             | Some v -> Credited v
+             | None -> failwith "Qty.of_mutez")
+          int64))
+
+type balance_updates = (balance * balance_update) list
+
+let balance_updates_encoding =
+  let open Data_encoding in
+  def "operation_metadata.alpha.balance_updates" @@
+  list (merge_objs balance_encoding balance_update_encoding)
+
+let cleanup_balance_updates balance_updates =
+  List.filter
+    (fun (_, (Credited update | Debited update)) ->
+       not (Tez_repr.equal update Tez_repr.zero))
+    balance_updates
+
 type frozen_balance = {
   deposit : Tez_repr.t ;
   fees : Tez_repr.t ;
diff --git a/src/proto_alpha/lib_protocol/src/delegate_storage.mli b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
index c3e2f1306..31125af0a 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_storage.mli
+++ b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
@@ -7,6 +7,26 @@
 (*                                                                        *)
 (**************************************************************************)
 
+(** Places where tezzies can be found in the ledger's state. *)
+type balance =
+  | Contract of Contract_repr.t
+  | Rewards of Signature.Public_key_hash.t * Cycle_repr.t
+  | Fees of Signature.Public_key_hash.t * Cycle_repr.t
+  | Deposits of Signature.Public_key_hash.t * Cycle_repr.t
+
+(** A credit or debit of tezzies to a balance. *)
+type balance_update =
+  | Debited of Tez_repr.t
+  | Credited of Tez_repr.t
+
+(** A list of balance updates. Duplicates may happen. *)
+type balance_updates = (balance * balance_update) list
+
+val balance_updates_encoding : balance_updates Data_encoding.t
+
+(** Remove zero-valued balances from a list of updates. *)
+val cleanup_balance_updates : balance_updates -> balance_updates
+
 type frozen_balance = {
   deposit : Tez_repr.t ;
   fees : Tez_repr.t ;