diff --git a/deku-p/src/core/crypto/tests/alg_intf_tests.ml b/deku-p/src/core/crypto/tests/alg_intf_tests.ml
index 7e0da46e6..3577cbbbf 100644
--- a/deku-p/src/core/crypto/tests/alg_intf_tests.ml
+++ b/deku-p/src/core/crypto/tests/alg_intf_tests.ml
@@ -96,6 +96,8 @@ struct
       List.for_all
         (fun (signature, _) -> Signature.equal signature signature)
         (List.flatten signatures)
+
+    let zero = Signature.(to_b58 zero)
   end
 
   module Test_secret_key_data = struct
@@ -217,5 +219,10 @@ struct
       Alcotest.(check' bool)
         ~msg:"signature equality works" ~expected:Tezos_data.equality_signatures
         ~actual:Signature_data.equality_signatures
+
+    let zero () =
+      Alcotest.(check' string)
+        ~msg:"zeros are equal" ~expected:Tezos_data.zero
+        ~actual:Signature_data.zero
   end
 end
diff --git a/deku-p/src/core/crypto/tests/data_for_tests/data_gen.ml b/deku-p/src/core/crypto/tests/data_for_tests/data_gen.ml
index c3a12e187..e04ae6ef6 100644
--- a/deku-p/src/core/crypto/tests/data_for_tests/data_gen.ml
+++ b/deku-p/src/core/crypto/tests/data_for_tests/data_gen.ml
@@ -152,6 +152,9 @@ struct
       List.for_all
         (fun (signature, _) -> equal signature signature)
         (List.flatten signatures)
+
+    let zero = to_b58check zero
+    let size = Signature.size
   end
 
   module Print_secret_key = struct
@@ -262,5 +265,8 @@ struct
 
     let print_equality_signatures () =
       Format.printf "let equality_signatures = %b\n%!" Sig.equality_signatures
+
+    let print_zero () = Format.printf "let size = %s\n%!" Sig.zero
+    let print_size () = Format.printf "let size = %d\n%!" Sig.size
   end
 end
diff --git a/deku-p/src/core/crypto/tests/test_ed25519.ml b/deku-p/src/core/crypto/tests/test_ed25519.ml
index 4f4662006..daf5e7a65 100644
--- a/deku-p/src/core/crypto/tests/test_ed25519.ml
+++ b/deku-p/src/core/crypto/tests/test_ed25519.ml
@@ -108,5 +108,6 @@ let run () =
             Test_signature_data.verified_after_conversion;
           test_case "compare" `Quick Test_signature_data.compare;
           test_case "equality" `Quick Test_signature_data.equality;
+          test_case "zero" `Quick Test_signature_data.zero;
         ] );
     ]
diff --git a/deku-p/src/core/crypto/tests/tezos_test_data.ml b/deku-p/src/core/crypto/tests/tezos_test_data.ml
index 406191c9d..4286c1836 100644
--- a/deku-p/src/core/crypto/tests/tezos_test_data.ml
+++ b/deku-p/src/core/crypto/tests/tezos_test_data.ml
@@ -12,6 +12,8 @@ module type Tezos_data = sig
   val verified_after_conversion : bool list list
   val compare_signatures : string
   val equality_signatures : bool
+  val zero : string
+  val size : int
 end
 
 module Ed25519_data : Tezos_data = struct
@@ -85,4 +87,9 @@ module Ed25519_data : Tezos_data = struct
     "91081191031691771406248755413517719868942512392481441632319412010666151141106451551101241942249971174175182242212251649245136305224924457148320716512414112166188161618190194214219818013081233222801413320111118411617224175182697921413520019617124319212224281575910110314298902061291292362082351062261611109622029451142202472498122112828315411214215471082222729123871735036826813621811319581522823924522014218815718322611124147618451202231202222241125131214241501291192181951141832152991781842408712281731501424122371978512858881034311216038137212222221701994853165206153192065917210814639481615812041192252331121887779321462221402352471622372311222419183228233252711752494627158132117237521831261901421461485713632187712111831888518153178162081072381711341312056321241202152911914613236164154672325214125126641391315222910617026622611023619623237163202165210167195112025420270145177601410455152100204982202025018985195451024720916413551227233221127212227138415130471601087018580897313485383982099117189167222331842521313212095144117181661332451758462121252132181263415321022381209015196154491568518813348222016710840741682502172392115321317418380721936988615517815114717922117084259619815528250992395598166781281214815497104907822813961756420119814520959797961436722040186138124195165871412074379820676221431153718424622398155194223613450117101197824118422216520944615915379247196942071241421305076205243853614278816518458182137105586319317121525322312967129212227584115116140811121701752267764410311641882301382081069964522973023564211195207148967151174216244402241622225113721163122271031791912249975680128247139414214813200116312233146135224112620761168159418321222145236712046797228177596873940182125213190137226911039417317693114191676220091407724623814212624973918412673228222130151232211444910221229194100197169239891202179112148125144871451185819420724217413234511461742461287612461148758915816421610110714134341307288251765248902276497721303441294615713624017125124116814525301202279107223196312131101120232832101392458921021483219192253220134215204240951381602001043919911812032281402031152031220922915521421179455140359513595661841882501774190551548198541841041557711150211322322017475219184961561411321462512362302331185499242122237872961281946823618911184157169527723380605140861281322433941261133235241481712012241621282323325113206361171821889425263912406417012255203196279151931761401471351832361501611516226211204795010458249912431211149148562336015158208745811841055521515211924422196144124121351903974391791409824221154216302392209011320799164101602079040191814324314323825162208148349271216815951427590883010013115725211423817976255811022091765012919610016891122042513815525158910032319416918956610710103335639118438821793233701104114424823420815102816868146784036103186204101231234296723818159158201881636620910223210569464232216117107110245201911169123691277721715599195253871662111989610117413622018519683126111841701942591951357222315115710810165232170160114156145361422052912521121794191175921792387944393211991742131181831625511318228241501953146218148576335124233174129145131993113822031156233989615779164682199380202165177108164172192139178253951601631684424723918990141881491421019310169128631901161222092501921379171891696121814414093133322011689319191561601852062201531761221999321512910244122810374401512453373133188180699251139152129511601581791732317822723267901231411421042451971141661711203822284221124411887153152885824510324019522814649371211634918721110039125160182220618521510914719711120317639244621182074611921180206146552341801865112495202218103851222532124710862418217777129261571488394110122145240237526824312513738321817510622786413018018401311711386272190158155414224622695207891815816929129188198422021412514169196242431851003250544623853192203212168182174638624379104462402937731462457920812721614625017419810516722549949513228154254920420892061981181451254210511151449337179112522189221214991541452216888792178033151539180191152191121985857411124514910786174659174254141942222424441521642449902171675896229397510078691449332371363"
 
   let equality_signatures = true
+
+  let zero =
+    "edsigtXomBKi5CTRf5cjATJWSyaRvhfYNHqSUGrn4SdbYRcGwQrUGjzEfQDTuqHhuA8b2d8NarZjz8TRf65WkpQmo423BtomS8Q"
+
+  let size = 64
 end