diff --git a/src/proto_alpha/lib_protocol/src/alpha_context.mli b/src/proto_alpha/lib_protocol/src/alpha_context.mli
index d049b8164..48993996e 100644
--- a/src/proto_alpha/lib_protocol/src/alpha_context.mli
+++ b/src/proto_alpha/lib_protocol/src/alpha_context.mli
@@ -910,6 +910,7 @@ module Operation : sig
 
   val hash: _ operation -> Operation_hash.t
   val hash_raw: raw -> Operation_hash.t
+  val hash_packed: packed_operation -> Operation_hash.t
 
   val acceptable_passes: packed_operation -> int list
 
diff --git a/src/proto_alpha/lib_protocol/src/operation_repr.ml b/src/proto_alpha/lib_protocol/src/operation_repr.ml
index 35071e29d..74d30f165 100644
--- a/src/proto_alpha/lib_protocol/src/operation_repr.ml
+++ b/src/proto_alpha/lib_protocol/src/operation_repr.ml
@@ -675,6 +675,12 @@ let hash (o : _ operation) =
       protocol_data_encoding
       (Operation_data o.protocol_data) in
   Operation.hash { shell = o.shell ; proto }
+let hash_packed (o : packed_operation) =
+  let proto =
+    Data_encoding.Binary.to_bytes_exn
+      protocol_data_encoding
+      o.protocol_data in
+  Operation.hash { shell = o.shell ; proto }
 
 type ('a, 'b) eq = Eq : ('a, 'a) eq
 
diff --git a/src/proto_alpha/lib_protocol/src/operation_repr.mli b/src/proto_alpha/lib_protocol/src/operation_repr.mli
index a1546d954..544193692 100644
--- a/src/proto_alpha/lib_protocol/src/operation_repr.mli
+++ b/src/proto_alpha/lib_protocol/src/operation_repr.mli
@@ -156,6 +156,7 @@ val raw: _ operation -> raw
 
 val hash_raw: raw -> Operation_hash.t
 val hash: _ operation -> Operation_hash.t
+val hash_packed: packed_operation -> Operation_hash.t
 
 val acceptable_passes: packed_operation -> int list
 
diff --git a/src/proto_alpha/lib_protocol/test/double_endorsement.ml b/src/proto_alpha/lib_protocol/test/double_endorsement.ml
index ae5534e36..3230e8111 100644
--- a/src/proto_alpha/lib_protocol/test/double_endorsement.ml
+++ b/src/proto_alpha/lib_protocol/test/double_endorsement.ml
@@ -55,7 +55,7 @@ let valid_double_endorsement_evidence () =
   Context.get_endorser (B blk_a) 0 >>=? fun delegate ->
   Op.endorsement ~delegate (B blk_a) [0] >>=? fun endorsement_a ->
   Op.endorsement ~delegate (B blk_b) [0] >>=? fun endorsement_b ->
-  Block.bake ~operations:[endorsement_a] blk_a >>=? fun blk_a ->
+  Block.bake ~operations:[Operation.pack endorsement_a] blk_a >>=? fun blk_a ->
   (* Block.bake ~operations:[endorsement_b] blk_b >>=? fun _ -> *)
 
   Op.double_endorsement (B blk_a) endorsement_a endorsement_b >>=? fun operation ->
@@ -84,7 +84,7 @@ let invalid_double_endorsement () =
   Block.bake b >>=? fun b ->
 
   Op.endorsement (B b) [0] >>=? fun endorsement ->
-  Block.bake ~operation:endorsement b >>=? fun b ->
+  Block.bake ~operation:(Operation.pack endorsement) b >>=? fun b ->
 
   Op.double_endorsement (B b) endorsement endorsement >>=? fun operation ->
   Block.bake ~operation b >>= fun res ->
diff --git a/src/proto_alpha/lib_protocol/test/endorsement.ml b/src/proto_alpha/lib_protocol/test/endorsement.ml
index 42bfb2934..63ca33f9a 100644
--- a/src/proto_alpha/lib_protocol/test/endorsement.ml
+++ b/src/proto_alpha/lib_protocol/test/endorsement.ml
@@ -68,7 +68,7 @@ let simple_endorsement () =
     (Contract.implicit_contract endorser) >>=? fun initial_balance ->
   Block.bake
     ~policy:(Excluding [endorser])
-    ~operations:[op]
+    ~operations:[Operation.pack op]
     b >>=? fun b2 ->
   assert_endorser_balance_consistency ~loc:__LOC__
     (B b2) ~nb_endorsement:1 endorser initial_balance
@@ -87,7 +87,7 @@ let max_endorsement () =
       let delegate = endorser.delegate in
       Context.Contract.balance (B b) (Contract.implicit_contract delegate) >>=? fun balance ->
       Op.endorsement ~delegate (B b) endorser.slots >>=? fun op ->
-      return (delegate :: delegates, op :: ops, (List.length endorser.slots, balance) :: balances)
+      return (delegate :: delegates, Operation.pack op :: ops, (List.length endorser.slots, balance) :: balances)
     )
     ([], [], [])
     endorsers >>=? fun (delegates, ops, previous_balances) ->
@@ -116,6 +116,7 @@ let consistent_priority () =
   Context.Contract.balance (B b) (Contract.implicit_contract endorser) >>=? fun balance ->
 
   Op.endorsement ~delegate:endorser (B b) [slot] >>=? fun operation ->
+  let operation = Operation.pack operation in
   Block.bake ~policy:( Excluding [ endorser ] ) ~operation b >>=? fun b ->
 
   assert_endorser_balance_consistency ~loc:__LOC__ ~priority:15
@@ -140,6 +141,7 @@ let consistent_priorities () =
 
       Context.Contract.balance (B b) (Contract.implicit_contract endorser) >>=? fun balance ->
       Op.endorsement ~delegate:endorser (B b) [slot] >>=? fun operation ->
+      let operation = Operation.pack operation in
       Block.bake ~policy:( Excluding [ endorser ] ) ~operation b >>=? fun b ->
 
       assert_endorser_balance_consistency ~loc:__LOC__ ~priority
@@ -156,6 +158,7 @@ let reward_retrieval () =
   Context.get_endorser (B b) slot >>=? fun endorser ->
   Context.Contract.balance (B b) (Contract.implicit_contract endorser) >>=? fun balance ->
   Op.endorsement ~delegate:endorser (B b) [slot] >>=? fun operation ->
+  let operation = Operation.pack operation in
   Block.bake ~policy:(Excluding [ endorser ]) ~operation b >>=? fun b ->
   (* Bake (preserved_cycles + 1) cycles *)
   fold_left_s (fun b _ ->
@@ -176,6 +179,7 @@ let wrong_endorsement_predecessor () =
   Context.get_endorser (B b) 0 >>=? fun genesis_endorser ->
   Block.bake b >>=? fun b' ->
   Op.endorsement ~delegate:genesis_endorser ~signing_context:(B b') (B b) [0]  >>=? fun operation ->
+  let operation = Operation.pack operation in
   Block.bake ~operation b' >>= fun res ->
 
   Assert.proto_error ~loc:__LOC__ res begin function
@@ -190,6 +194,7 @@ let invalid_endorsement_level () =
   Context.get_level (B b) >>=? fun genesis_level ->
   Block.bake b >>=? fun b ->
   Op.endorsement ~level:genesis_level (B b) [0] >>=? fun operation ->
+  let operation = Operation.pack operation in
   Block.bake ~operation b >>= fun res ->
 
   Assert.proto_error ~loc:__LOC__ res begin function
@@ -202,8 +207,10 @@ let duplicate_endorsement () =
   Context.init 5 >>=? fun (b, _) ->
   Incremental.begin_construction b >>=? fun inc ->
   Op.endorsement (B b) [0]  >>=? fun operation ->
+  let operation = Operation.pack operation in
   Incremental.add_operation inc operation >>=? fun inc ->
   Op.endorsement (B b) [0]  >>=? fun operation ->
+  let operation = Operation.pack operation in
   Incremental.add_operation inc operation >>= fun res ->
 
   Assert.proto_error ~loc:__LOC__ res begin function
@@ -219,6 +226,7 @@ let invalid_endorsement_slot () =
   Context.get_endorser (B b) 0 >>=? fun endorser ->
   Op.endorsement ~delegate:endorser (B b) [endorsers_per_block + 1]  >>=? fun operation ->
 
+  let operation = Operation.pack operation in
   Block.bake ~operation b >>= fun res ->
 
   Assert.proto_error ~loc:__LOC__ res begin function
diff --git a/src/proto_alpha/lib_protocol/test/helpers/block.ml b/src/proto_alpha/lib_protocol/test/helpers/block.ml
index 7eb6ab367..fc2ab3cf5 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/block.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/block.ml
@@ -15,7 +15,7 @@ open Alpha_context
 type t = {
   hash : Block_hash.t ;
   header : Block_header.t ;
-  operations : Operation.t list ;
+  operations : Operation.packed list ;
   context : Tezos_protocol_environment_memory.Context.t ;
 }
 type block = t
@@ -152,7 +152,7 @@ module Forge = struct
       | { expected_commitment = true } -> Some (fst (Proto_Nonce.generate ()))
       | { expected_commitment = false } -> None
     end >>=? fun seed_nonce_hash ->
-    let hashes = List.map Operation.hash operations in
+    let hashes = List.map Operation.hash_packed operations in
     let operations_hash = Operation_list_list_hash.compute
         [Operation_list_hash.compute hashes] in
     let header = make_header
@@ -229,7 +229,6 @@ let genesis
     ?(blocks_per_roll_snapshot = Constants_repr.default.blocks_per_roll_snapshot)
     ?(blocks_per_voting_period = Constants_repr.default.blocks_per_voting_period)
     ?(time_between_blocks = Constants_repr.default.time_between_blocks)
-    ?(first_free_baking_slot = Constants_repr.default.first_free_baking_slot)
     ?(endorsers_per_block = Constants_repr.default.endorsers_per_block)
     ?(hard_gas_limit_per_operation = Constants_repr.default.hard_gas_limit_per_operation)
     ?(hard_gas_limit_per_block = Constants_repr.default.hard_gas_limit_per_block)
@@ -276,7 +275,6 @@ let genesis
     blocks_per_roll_snapshot ;
     blocks_per_voting_period ;
     time_between_blocks ;
-    first_free_baking_slot ;
     endorsers_per_block ;
     hard_gas_limit_per_operation ;
     hard_gas_limit_per_block ;
diff --git a/src/proto_alpha/lib_protocol/test/helpers/block.mli b/src/proto_alpha/lib_protocol/test/helpers/block.mli
index bf1ada329..d12c98bf9 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/block.mli
+++ b/src/proto_alpha/lib_protocol/test/helpers/block.mli
@@ -13,7 +13,7 @@ open Alpha_context
 type t = {
   hash : Block_hash.t ;
   header : Block_header.t ;
-  operations : Operation.t list ;
+  operations : Operation.packed list ;
   context : Tezos_protocol_environment_memory.Context.t ; (** Resulting context *)
 }
 type block = t
@@ -46,7 +46,7 @@ module Forge : sig
       The header can then be modified and applied with [apply]. *)
   val forge_header:
     ?policy:baker_policy ->
-    ?operations: Operation.t list ->
+    ?operations: Operation.packed list ->
     t -> header tzresult Lwt.t
 
   (** Sets seed_nonce_hash of a header *)
@@ -67,7 +67,6 @@ val genesis:
   ?blocks_per_roll_snapshot:int32 ->
   ?blocks_per_voting_period:int32 ->
   ?time_between_blocks:Period_repr.t list ->
-  ?first_free_baking_slot:int ->
   ?endorsers_per_block:int ->
   ?hard_gas_limit_per_operation:Z.t ->
   ?hard_gas_limit_per_block:Z.t ->
@@ -93,7 +92,7 @@ val genesis:
 (** Applies a header and its operations to a block and obtains a new block *)
 val apply:
   Forge.header ->
-  ?operations: Operation.t list ->
+  ?operations: Operation.packed list ->
   t -> t tzresult Lwt.t
 
 (**
@@ -103,8 +102,8 @@ val apply:
 *)
 val bake:
   ?policy: baker_policy ->
-  ?operation: Operation.t ->
-  ?operations: Operation.t list ->
+  ?operation: Operation.packed ->
+  ?operations: Operation.packed list ->
   t -> t tzresult Lwt.t
 
 (** Bakes [n] blocks. *)
diff --git a/src/proto_alpha/lib_protocol/test/helpers/incremental.ml b/src/proto_alpha/lib_protocol/test/helpers/incremental.ml
index 4cc352dbf..2c63a54ce 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/incremental.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/incremental.ml
@@ -13,7 +13,7 @@ open Alpha_context
 type t = {
   predecessor: Block.t ;
   state: M.validation_state ;
-  rev_operations: Operation.t list ;
+  rev_operations: Operation.packed list ;
   header: Block_header.t ;
   delegate: Account.t ;
 }
@@ -88,7 +88,7 @@ let finalize_block st =
   let operations = List.rev st.rev_operations in
   let operations_hash =
     Operation_list_list_hash.compute [
-      Operation_list_hash.compute (List.map Operation.hash operations)
+      Operation_list_hash.compute (List.map Operation.hash_packed operations)
     ] in
   let header =
     { st.header with
diff --git a/src/proto_alpha/lib_protocol/test/helpers/incremental.mli b/src/proto_alpha/lib_protocol/test/helpers/incremental.mli
index 7677d4404..de6597905 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/incremental.mli
+++ b/src/proto_alpha/lib_protocol/test/helpers/incremental.mli
@@ -23,7 +23,7 @@ val begin_construction:
   Block.t -> incremental tzresult Lwt.t
 
 val add_operation:
-  incremental -> Operation.t -> incremental tzresult Lwt.t
+  incremental -> Operation.packed -> incremental tzresult Lwt.t
 
 val finalize_block: incremental -> Block.t tzresult Lwt.t
 
diff --git a/src/proto_alpha/lib_protocol/test/helpers/op.ml b/src/proto_alpha/lib_protocol/test/helpers/op.ml
index 24e0b2da6..283c57604 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/op.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/op.ml
@@ -10,19 +10,20 @@
 open Proto_alpha
 open Alpha_context
 
-let sign ?(watermark = Signature.Generic_operation) sk ctxt contents =
+let sign ?(watermark = Signature.Generic_operation)
+    sk ctxt contents =
   let branch = Context.branch ctxt in
   let unsigned =
     Data_encoding.Binary.to_bytes_exn
       Operation.unsigned_encoding
-      ({ branch }, contents) in
+      ({ branch }, Contents_list contents) in
   let signature = Some (Signature.sign ~watermark sk unsigned) in
-  { shell = { branch } ;
-    protocol_data = {
-      contents ;
-      signature ;
-    } ;
-  }
+  ({ shell = { branch } ;
+     protocol_data = {
+       contents ;
+       signature ;
+     } ;
+   } : _ Operation.t)
 
 let endorsement ?delegate ?level ctxt =
   fun ?(signing_context=ctxt) slots ->
@@ -38,40 +39,77 @@ let endorsement ?delegate ?level ctxt =
       | Some level -> return level
     end >>=? fun level ->
     let op =
-      let operations = Endorsements { block = Context.branch ctxt ; level ; slots = slots } in
-      Sourced_operation (Consensus_operation operations) in
+      Single
+        (Endorsements
+           { block = Context.branch ctxt ; level ; slots = slots }) in
     return (sign ~watermark:Signature.Endorsement delegate.sk signing_context op)
 
-let manager_operations ?(fee = Tez.zero)
+let sign ?watermark sk ctxt (Contents_list contents) =
+  Operation.pack (sign ?watermark sk ctxt contents)
+
+let manager_operation
+    ?(fee = Tez.zero)
     ?(gas_limit = Constants_repr.default.hard_gas_limit_per_operation)
     ?(storage_limit = Constants_repr.default.hard_storage_limit_per_operation)
-    ?public_key ~source ctxt operations =
+    ?public_key ~source ctxt operation =
   Context.Contract.counter ctxt source >>=? fun counter ->
   Context.Contract.manager ctxt source >>=? fun account ->
   let public_key = Option.unopt ~default:account.pk public_key in
   let counter = Int32.succ counter in
-  Context.Contract.is_manager_key_revealed ctxt source >>=? begin function
-    | true -> return operations
-    | false -> return @@ (Reveal public_key) :: operations end >>=? fun operations ->
-  return @@ Manager_operations {
-    source ;
-    fee ;
-    counter ;
-    operations ;
-    gas_limit ;
-    storage_limit ;
-  }
+  Context.Contract.is_manager_key_revealed ctxt source >>=? function
+  | true ->
+      let op =
+        Manager_operation {
+          source ;
+          fee ;
+          counter ;
+          operation ;
+          gas_limit ;
+          storage_limit ;
+        } in
+      return (Contents_list (Single op))
+  | false ->
+      let op_reveal =
+        Manager_operation {
+          source ;
+          fee = Tez.zero ;
+          counter ;
+          operation = Reveal public_key ;
+          gas_limit = Z.of_int 20 ;
+          storage_limit = 0L ;
+        } in
+      let op =
+        Manager_operation {
+          source ;
+          fee ;
+          counter = Int32.succ counter ;
+          operation ;
+          gas_limit ;
+          storage_limit ;
+        } in
+      return (Contents_list (Cons (op_reveal, Single op)))
 
 let revelation ctxt public_key =
   let pkh = Signature.Public_key.hash public_key in
-  let contract = Contract.implicit_contract pkh in
-  manager_operations ~source:contract ~public_key ctxt [] >>=? fun mop ->
-  let sop = Sourced_operation mop in
-  Context.Contract.manager ctxt contract >>=? fun account ->
+  let source = Contract.implicit_contract pkh in
+  Context.Contract.counter ctxt source >>=? fun counter ->
+  Context.Contract.manager ctxt source >>=? fun account ->
+  let counter = Int32.succ counter in
+  let sop =
+    Contents_list
+      (Single
+         (Manager_operation {
+             source ;
+             fee = Tez.zero ;
+             counter ;
+             operation = Reveal public_key ;
+             gas_limit = Z.of_int 20 ;
+             storage_limit = 0L ;
+           })) in
   return @@ sign account.sk ctxt sop
 
-let originated_contract (op:Operation.t) =
-  let nonce = Contract.initial_origination_nonce (Operation.hash op) in
+let originated_contract (op: Operation.packed) =
+  let nonce = Contract.initial_origination_nonce (Operation.hash_packed op) in
   Contract.originated_contract nonce
 
 exception Impossible
@@ -84,7 +122,8 @@ let origination ?delegate ?script
   let default_credit = Tez.of_mutez @@ Int64.of_int 1000001 in
   let default_credit = Option.unopt_exn Impossible default_credit in
   let credit = Option.unopt ~default:default_credit credit in
-  let operations = [Origination {
+  let operation =
+    Origination {
       manager ;
       delegate ;
       script ;
@@ -92,11 +131,10 @@ let origination ?delegate ?script
       delegatable ;
       credit ;
       preorigination ;
-    }] in
-  manager_operations ?public_key ?fee ?gas_limit ?storage_limit
-    ~source ctxt operations >>=? fun mop ->
-  let sop = Sourced_operation mop in
-  let op:Operation.t = sign account.sk ctxt sop in
+    } in
+  manager_operation ?public_key ?fee ?gas_limit ?storage_limit
+    ~source ctxt operation >>=? fun sop ->
+  let op = sign account.sk ctxt sop in
   return (op , originated_contract op)
 
 let miss_signed_endorsement ?level ctxt slot =
@@ -117,16 +155,14 @@ let transaction ?fee ?gas_limit ?storage_limit ?parameters ctxt
       parameters;
       destination=dst;
     } in
-  manager_operations ?fee ?gas_limit ?storage_limit
-    ~source:src ctxt [top] >>=? fun mop ->
-  let sop = Sourced_operation mop in
+  manager_operation ?fee ?gas_limit ?storage_limit
+    ~source:src ctxt top >>=? fun sop ->
   Context.Contract.manager ctxt src >>=? fun account ->
   return @@ sign account.sk ctxt sop
 
 let delegation ?fee ctxt source dst =
   let top = Delegation dst in
-  manager_operations ?fee ~source ctxt [top] >>=? fun mop ->
-  let sop = Sourced_operation mop in
+  manager_operation ?fee ~source ctxt top >>=? fun sop ->
   Context.Contract.manager ctxt source >>=? fun account ->
   return @@ sign account.sk ctxt sop
 
@@ -137,42 +173,36 @@ let activation ctxt (pkh : Signature.Public_key_hash.t) activation_code =
                      encrypted public key hash" Signature.Public_key_hash.pp pkh
   end >>=? fun id ->
   let contents =
-    Anonymous_operations
-      [ Activation { id ; activation_code } ]
-  in
+    Single (Activate_account { id ; activation_code } ) in
   let branch = Context.branch ctxt in
   return {
     shell = { branch } ;
-    protocol_data = {
-      contents ;
-      signature = None ;
-    } ;
+    protocol_data = Operation_data {
+        contents ;
+        signature = None ;
+      } ;
   }
 
 let double_endorsement ctxt op1 op2 =
   let contents =
-    Anonymous_operations [
-      Double_endorsement_evidence {op1 ; op2}
-    ] in
+    Single (Double_endorsement_evidence {op1 ; op2}) in
   let branch = Context.branch ctxt in
   return {
     shell = { branch } ;
-    protocol_data = {
-      contents ;
-      signature = None ;
-    } ;
+    protocol_data = Operation_data {
+        contents ;
+        signature = None ;
+      } ;
   }
 
 let double_baking ctxt bh1 bh2 =
   let contents =
-    Anonymous_operations [
-      Double_baking_evidence {bh1 ; bh2}
-    ] in
+    Single (Double_baking_evidence {bh1 ; bh2}) in
   let branch = Context.branch ctxt in
   return {
     shell = { branch } ;
-    protocol_data = {
-      contents ;
-      signature = None ;
-    } ;
+    protocol_data = Operation_data {
+        contents ;
+        signature = None ;
+      } ;
   }
diff --git a/src/proto_alpha/lib_protocol/test/helpers/op.mli b/src/proto_alpha/lib_protocol/test/helpers/op.mli
index 798093d8d..b826de12d 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/op.mli
+++ b/src/proto_alpha/lib_protocol/test/helpers/op.mli
@@ -14,11 +14,11 @@ val endorsement:
   ?delegate:public_key_hash ->
   ?level:Raw_level.t ->
   Context.t -> ?signing_context:Context.t ->
-  int list -> Operation.t tzresult Lwt.t
+  int list -> Kind.endorsements Operation.t tzresult Lwt.t
 
 val miss_signed_endorsement:
   ?level:Raw_level.t ->
-  Context.t -> int -> Operation.t tzresult Lwt.t
+  Context.t -> int -> Kind.endorsements Operation.t tzresult Lwt.t
 
 val transaction:
   ?fee:Tez.tez ->
@@ -29,15 +29,15 @@ val transaction:
   Contract.t ->
   Contract.t ->
   Tez.t ->
-  Operation.t tzresult Lwt.t
+  Operation.packed tzresult Lwt.t
 
 val delegation:
   ?fee:Tez.tez -> Context.t ->
   Contract.t -> public_key_hash option ->
-  Operation.t tzresult Lwt.t
+  Operation.packed tzresult Lwt.t
 
 val revelation:
-  Context.t -> public_key -> Operation.t tzresult Lwt.t
+  Context.t -> public_key -> Operation.packed tzresult Lwt.t
 
 val origination:
   ?delegate:public_key_hash ->
@@ -53,20 +53,24 @@ val origination:
   ?storage_limit:int64 ->
   Context.t ->
   Contract.contract ->
-  (Operation.t * Contract.contract) tzresult Lwt.t
+  (Operation.packed * Contract.contract) tzresult Lwt.t
 
 val originated_contract:
-  Operation.t -> Contract.contract
+  Operation.packed -> Contract.contract
 
 val double_endorsement:
-  Context.t ->  Operation.t -> Operation.t
-  -> Operation.t tzresult Lwt.t
+  Context.t ->
+  Kind.endorsements Operation.t ->
+  Kind.endorsements Operation.t ->
+  Operation.packed tzresult Lwt.t
 
 val double_baking:
-  Context.t ->  Block_header.block_header -> Block_header.block_header
-  -> Operation.t tzresult Lwt.t
+  Context.t ->
+  Block_header.block_header ->
+  Block_header.block_header ->
+  Operation.packed tzresult Lwt.t
 
 val activation:
   Context.t ->
   Signature.Public_key_hash.t -> Blinded_public_key_hash.activation_code ->
-  Operation.t tzresult Lwt.t
+  Operation.packed tzresult Lwt.t
diff --git a/src/proto_alpha/lib_protocol/test/jbuild b/src/proto_alpha/lib_protocol/test/jbuild
index 082f3cb25..105ad647c 100644
--- a/src/proto_alpha/lib_protocol/test/jbuild
+++ b/src/proto_alpha/lib_protocol/test/jbuild
@@ -17,10 +17,10 @@
                     -open Tezos_alpha_test_helpers
 ))))
 
-;;(alias
-;; ((name buildtest)
-;;  (package tezos-protocol-alpha)
-;;  (deps (main.exe))))
+(alias
+ ((name buildtest)
+  (package tezos-protocol-alpha)
+  (deps (main.exe))))
 
 ; runs only the `Quick tests
 (alias
@@ -34,10 +34,10 @@
   (package tezos-protocol-alpha)
   (action (chdir ${ROOT} (run ${exe:main.exe} -v)))))
 
-;;(alias
-;; ((name runtest)
-;;  (package tezos-protocol-alpha)
-;;  (deps ((alias runtest_proto_alpha)))))
+(alias
+ ((name runtest)
+  (package tezos-protocol-alpha)
+  (deps ((alias runtest_proto_alpha)))))
 
 (alias
  ((name runtest_indent)