diff --git a/src/proto_alpha/lib_client/operation_result.ml b/src/proto_alpha/lib_client/operation_result.ml
index 1e4c5757e..bf8f4ff68 100644
--- a/src/proto_alpha/lib_client/operation_result.ml
+++ b/src/proto_alpha/lib_client/operation_result.ml
@@ -300,15 +300,13 @@ let rec pp_contents_and_result_list :
           Ed25519.Public_key_hash.pp id
           pp_balance_updates bus
     | Single_and_result
-        (Endorsement { block ; level },
+        (Endorsement { level },
          Endorsement_result (delegate, slots)) ->
         Format.fprintf ppf
           "@[<v 2>Endorsement:@,\
-           Block: %a@,\
            Level: %a@,\
            Delegate: %a@,\
            Slots: %a@]"
-          Block_hash.pp block
           Raw_level.pp level
           Signature.Public_key_hash.pp delegate
           (Format.pp_print_list
diff --git a/src/proto_alpha/lib_delegate/test/proto_alpha_helpers.ml b/src/proto_alpha/lib_delegate/test/proto_alpha_helpers.ml
index 9f91e2fa5..a02a0609f 100644
--- a/src/proto_alpha/lib_delegate/test/proto_alpha_helpers.ml
+++ b/src/proto_alpha/lib_delegate/test/proto_alpha_helpers.ml
@@ -554,7 +554,7 @@ module Endorse = struct
     let level = level.level in
     let shell = { Tezos_base.Operation.branch = hash } in
     let contents =
-      Single (Endorsement { block = hash ; level }) in
+      Single (Endorsement { level }) in
     sign ~watermark:Endorsement src_sk shell (Contents_list contents)
 
   let signing_slots
diff --git a/src/proto_alpha/lib_protocol/src/alpha_context.mli b/src/proto_alpha/lib_protocol/src/alpha_context.mli
index 8ff42b23e..d1f3ffa4c 100644
--- a/src/proto_alpha/lib_protocol/src/alpha_context.mli
+++ b/src/proto_alpha/lib_protocol/src/alpha_context.mli
@@ -803,7 +803,6 @@ and _ contents_list =
 
 and _ contents =
   | Endorsement : {
-      block: Block_hash.t ;
       level: Raw_level.t ;
     } -> Kind.endorsement contents
   | Seed_nonce_revelation : {
diff --git a/src/proto_alpha/lib_protocol/src/apply.ml b/src/proto_alpha/lib_protocol/src/apply.ml
index 9b5d8f5ce..744e6a4b2 100644
--- a/src/proto_alpha/lib_protocol/src/apply.ml
+++ b/src/proto_alpha/lib_protocol/src/apply.ml
@@ -608,10 +608,7 @@ let apply_contents_list
     (contents_list : kind contents_list)
   : (context * kind contents_result_list) tzresult Lwt.t =
   match contents_list with
-  | Single (Endorsement { block ; level }) ->
-      fail_unless
-        (Block_hash.equal block pred_block)
-        (Wrong_endorsement_predecessor (pred_block, block)) >>=? fun () ->
+  | Single (Endorsement { level }) ->
       let block = operation.shell.branch in
       fail_unless
         (Block_hash.equal block pred_block)
@@ -646,7 +643,7 @@ let apply_contents_list
       | Single (Endorsement e1),
         Single (Endorsement e2)
         when Raw_level.(e1.level = e2.level) &&
-             not (Block_hash.equal e1.block e2.block) ->
+             not (Block_hash.equal op1.shell.branch op2.shell.branch) ->
           let level = Level.from_raw ctxt e1.level in
           let oldest_level = Level.last_allowed_fork_level ctxt in
           fail_unless Level.(level < Level.current ctxt)
diff --git a/src/proto_alpha/lib_protocol/src/helpers_services.ml b/src/proto_alpha/lib_protocol/src/helpers_services.ml
index b82b7f8a0..fd7106095 100644
--- a/src/proto_alpha/lib_protocol/src/helpers_services.ml
+++ b/src/proto_alpha/lib_protocol/src/helpers_services.ml
@@ -390,9 +390,9 @@ module Forge = struct
       () ({ branch }, Contents_list (Single operation))
 
   let endorsement ctxt
-      b ~branch ~block ~level () =
+      b ~branch ~level () =
     operation ctxt b ~branch
-      (Endorsement { block ; level })
+      (Endorsement { level })
 
   let proposals ctxt
       b ~branch ~source ~period ~proposals () =
diff --git a/src/proto_alpha/lib_protocol/src/helpers_services.mli b/src/proto_alpha/lib_protocol/src/helpers_services.mli
index 93a0d0067..6445583d3 100644
--- a/src/proto_alpha/lib_protocol/src/helpers_services.mli
+++ b/src/proto_alpha/lib_protocol/src/helpers_services.mli
@@ -129,7 +129,6 @@ module Forge : sig
   val endorsement:
     'a #RPC_context.simple -> 'a ->
     branch:Block_hash.t ->
-    block:Block_hash.t ->
     level:Raw_level.t ->
     unit -> MBytes.t shell_tzresult Lwt.t
 
diff --git a/src/proto_alpha/lib_protocol/src/operation_repr.ml b/src/proto_alpha/lib_protocol/src/operation_repr.ml
index 1be4d3142..9ed1d08ab 100644
--- a/src/proto_alpha/lib_protocol/src/operation_repr.ml
+++ b/src/proto_alpha/lib_protocol/src/operation_repr.ml
@@ -52,7 +52,6 @@ and _ contents_list =
 
 and _ contents =
   | Endorsement : {
-      block: Block_hash.t ;
       level: Raw_level_repr.t ;
     } -> Kind.endorsement contents
   | Seed_nonce_revelation : {
@@ -305,8 +304,7 @@ module Encoding = struct
                inj: 'a -> 'b contents } -> 'b case
 
   let endorsement_encoding =
-    obj2
-      (req "block" Block_hash.encoding)
+    obj1
       (req "level" Raw_level_repr.encoding)
 
   let endorsement_case =
@@ -319,9 +317,9 @@ module Encoding = struct
           | Contents (Endorsement _ as op) -> Some op
           | _ -> None) ;
       proj =
-        (fun (Endorsement { block ; level }) -> (block, level)) ;
+        (fun (Endorsement { level }) -> level) ;
       inj =
-        (fun (block, level) -> Endorsement { block ; level })
+        (fun level -> Endorsement { level })
     }
 
   let endorsement_encoding =
diff --git a/src/proto_alpha/lib_protocol/src/operation_repr.mli b/src/proto_alpha/lib_protocol/src/operation_repr.mli
index 8589afd7c..2711c41a2 100644
--- a/src/proto_alpha/lib_protocol/src/operation_repr.mli
+++ b/src/proto_alpha/lib_protocol/src/operation_repr.mli
@@ -53,7 +53,6 @@ and _ contents_list =
 
 and _ contents =
   | Endorsement : {
-      block: Block_hash.t ;
       level: Raw_level_repr.t ;
     } -> Kind.endorsement contents
   | Seed_nonce_revelation : {
diff --git a/src/proto_alpha/lib_protocol/test/helpers/op.ml b/src/proto_alpha/lib_protocol/test/helpers/op.ml
index 7ebed2fea..a788aa2b9 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/op.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/op.ml
@@ -39,10 +39,7 @@ let endorsement ?delegate ?level ctxt ?(signing_context = ctxt) () =
     | None -> Context.get_level ctxt
     | Some level -> return level
   end >>=? fun level ->
-  let op =
-    Single
-      (Endorsement
-         { block = Context.branch ctxt ; level }) in
+  let op = Single (Endorsement { level }) in
   return (sign ~watermark:Signature.Endorsement delegate.sk signing_context op)
 
 let sign ?watermark sk ctxt (Contents_list contents) =