diff --git a/src/lib_crypto/ed25519.ml b/src/lib_crypto/ed25519.ml
index e522189c2..7a6968c28 100644
--- a/src/lib_crypto/ed25519.ml
+++ b/src/lib_crypto/ed25519.ml
@@ -182,6 +182,7 @@ module Signature = struct
 
   let to_bytes x = x
   let size = Sign.bytes
+  let zero = MBytes.init size '\000'
 
   let () =
     Base58.check_encoded_prefix b58check_encoding "edsig" 99
diff --git a/src/lib_crypto/ed25519.mli b/src/lib_crypto/ed25519.mli
index 7c0689271..1dcee47cc 100644
--- a/src/lib_crypto/ed25519.mli
+++ b/src/lib_crypto/ed25519.mli
@@ -81,6 +81,8 @@ module Signature : sig
 
   val size: int
 
+  val zero: t
+
   (** Check a signature *)
   val check: Public_key.t -> t -> MBytes.t -> bool
 
diff --git a/src/lib_protocol_environment/sigs/v1/ed25519.mli b/src/lib_protocol_environment/sigs/v1/ed25519.mli
index 22cab202b..19111bc40 100644
--- a/src/lib_protocol_environment/sigs/v1/ed25519.mli
+++ b/src/lib_protocol_environment/sigs/v1/ed25519.mli
@@ -80,6 +80,8 @@ module Signature : sig
   (** Append a signature *)
   val append: Secret_key.t -> MBytes.t -> MBytes.t
 
+  val zero: t
+
 end
 
 val sign: Secret_key.t -> MBytes.t -> Signature.t