diff --git a/contrib/kaitai-struct-files/files/alpha__smart_rollup__game.ksy b/contrib/kaitai-struct-files/files/alpha__smart_rollup__game.ksy
index b45db8af99024c044cc1f698b25f2617f08a077b..1ebedfc81d371e2c4e2d71de3bdb06090fdcdced 100644
--- a/contrib/kaitai-struct-files/files/alpha__smart_rollup__game.ksy
+++ b/contrib/kaitai-struct-files/files/alpha__smart_rollup__game.ksy
@@ -15,12 +15,12 @@ types:
       type: n
   attested:
     seq:
-    - id: level
-      type: s4
-    - id: index
+    - id: attested_tag
       type: u1
-    - id: commitment
-      size: 48
+      enum: attested_tag
+    - id: v0
+      type: v0
+      if: (attested_tag == attested_tag::v0)
   back_pointers:
     seq:
     - id: back_pointers_entries
@@ -176,7 +176,17 @@ types:
       type: s4
     - id: index
       type: u1
+  v0:
+    seq:
+    - id: level
+      type: s4
+    - id: index
+      type: u1
+    - id: commitment
+      size: 48
 enums:
+  attested_tag:
+    0: v0
   bool:
     0: false
     255: true
diff --git a/src/proto_alpha/lib_protocol/dal_slot_repr.ml b/src/proto_alpha/lib_protocol/dal_slot_repr.ml
index adc528fa144aa15a13fa5726dd9548cbb756b5e4..21b383c08b7bec6b201cbcfc8a5534d856bb95aa 100644
--- a/src/proto_alpha/lib_protocol/dal_slot_repr.ml
+++ b/src/proto_alpha/lib_protocol/dal_slot_repr.ml
@@ -84,7 +84,21 @@ module Header = struct
     conv
       (fun {id; commitment} -> (id, commitment))
       (fun (id, commitment) -> {id; commitment})
-      (merge_objs id_encoding (obj1 (req "commitment" Commitment.encoding)))
+      (* A tag is added to ensure we can migrate from this encoding to
+         different version if we decide to change the encoding. *)
+      (union
+         [
+           case
+             ~title:"v0"
+             (Tag 0)
+             (merge_objs
+                (obj1 (req "version" (constant "0")))
+                (merge_objs
+                   id_encoding
+                   (obj1 (req "commitment" Commitment.encoding))))
+             (fun x -> Some ((), x))
+             (fun ((), x) -> x);
+         ])
 
   let pp_id fmt {published_level; index} =
     Format.fprintf
diff --git a/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_applies_dal_pages).out b/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_applies_dal_pages).out
index 25e3bf89329f395800eaa63e9f6fa9f4b0a282b9..fb1cdb8f63a4808b8c2f0b69ac3beceef092d628 100644
--- a/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_applies_dal_pages).out	
+++ b/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_applies_dal_pages).out	
@@ -64,7 +64,7 @@ This sequence of operations was run:
 
 GET http://[HOST]:[PORT]/global/block/head/dal/slot_headers
 200 OK
-[{"level":4,"index":0,"commitment":"[DAL_SLOT_HEADER]"},{"level":4,"index":1,"commitment":"[DAL_SLOT_HEADER]"},{"level":4,"index":2,"commitment":"[DAL_SLOT_HEADER]"}]
+[{"version":"0","level":4,"index":0,"commitment":"[DAL_SLOT_HEADER]"},{"version":"0","level":4,"index":1,"commitment":"[DAL_SLOT_HEADER]"},{"version":"0","level":4,"index":2,"commitment":"[DAL_SLOT_HEADER]"}]
 
 GET http://[HOST]:[PORT]/global/block/head/dal/processed_slots
 200 OK
diff --git a/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_downloads_slots).out b/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_downloads_slots).out
index 88eb1e74003e39fb869a25423ca619b22f6b824d..fb3f446ffc2b4851469e754a76e226646e68a73b 100644
--- a/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_downloads_slots).out	
+++ b/tezt/tests/expected/dal.ml/Alpha- Testing DAL rollup and node with L1 (rollup_node_downloads_slots).out	
@@ -64,7 +64,7 @@ This sequence of operations was run:
 
 GET http://[HOST]:[PORT]/global/block/head/dal/slot_headers
 200 OK
-[{"level":4,"index":0,"commitment":"[DAL_SLOT_HEADER]"},{"level":4,"index":1,"commitment":"[DAL_SLOT_HEADER]"},{"level":4,"index":2,"commitment":"[DAL_SLOT_HEADER]"}]
+[{"version":"0","level":4,"index":0,"commitment":"[DAL_SLOT_HEADER]"},{"version":"0","level":4,"index":1,"commitment":"[DAL_SLOT_HEADER]"},{"version":"0","level":4,"index":2,"commitment":"[DAL_SLOT_HEADER]"}]
 
 GET http://[HOST]:[PORT]/global/block/head/dal/processed_slots
 200 OK