diff --git a/lib/api_web/controllers/get_hash.ex b/lib/api_web/controllers/get_hash.ex
index 158b1ff..d7ccd1b 100644
--- a/lib/api_web/controllers/get_hash.ex
+++ b/lib/api_web/controllers/get_hash.ex
@@ -4,53 +4,61 @@ defmodule ApiWeb.GetHash do
   import Ecto.Query
   require Logger
 
+  @valid_token "XHg0NWNhN2I3MTljNTRlOGU4NTAwOTljMDYwNTgxNDBmNzc5MTgxMzM3NmJmZTMwOGJjMGM4N2VkMzYwODUwMDFl"
+
   def index(conn, %{"study" => accessionnumber}) do
     Envar.load(".env")
     Envar.require_env_file(".env")
 
-    Logger.info("Accession get hash -> #{accessionnumber}")
+    if not valid_token?(conn) do
+      conn
+      |> put_status(:unauthorized)
+      |> json(%{error: "Token inválido o ausente"})
+    else
+      Logger.info("Accession get hash -> #{accessionnumber}")
 
-    studyidentifier = Envar.get("IDENTIFIERFIELD") || "IDSTUDY"
+      studyidentifier = Envar.get("IDENTIFIERFIELD") || "IDSTUDY"
 
-    # En caso de recibir idstudy en get hash -> where: s.accessionnumber == ^String.to_integer(accessionnumber),
+      # En caso de recibir idstudy en get hash -> where: s.accessionnumber == ^String.to_integer(accessionnumber),
 
-    query =
-      if studyidentifier == "IDSTUDY" do
-        from s in "study",
-          join: p in "patient",
-          on: p.idpatient == s.idpatient,
-          where: s.accessionnumber == ^accessionnumber,
-          select: %{
-            idstudy: s.idstudy,
-            patientid: p.patientid
-          }
-      else
-        from s in "study",
-          join: p in "patient",
-          on: p.idpatient == s.idpatient,
-          where: s.accessionnumber == ^accessionnumber,
-          select: %{
-            accessionnumber: s.accessionnumber,
-            patientid: p.patientid
-          }
+      query =
+        if studyidentifier == "IDSTUDY" do
+          from s in "study",
+            join: p in "patient",
+            on: p.idpatient == s.idpatient,
+            where: s.accessionnumber == ^accessionnumber,
+            select: %{
+              idstudy: s.idstudy,
+              patientid: p.patientid
+            }
+        else
+          from s in "study",
+            join: p in "patient",
+            on: p.idpatient == s.idpatient,
+            where: s.accessionnumber == ^accessionnumber,
+            select: %{
+              accessionnumber: s.accessionnumber,
+              patientid: p.patientid
+            }
+        end
+
+      case Repo.one(query) do
+        nil ->
+          conn
+          |> put_status(:not_found)
+          |> json(%{error: "Estudio no encontrado"})
+
+        res ->
+          vencimiento = DateTime.add(DateTime.utc_now(), 2 * 24 * 60 * 60, :second)
+
+          json_data = Map.put(res, :vencimiento, vencimiento)
+
+          token = generate_token(json_data)
+
+          conn
+          |> put_status(:ok)
+          |> json(%{hash: token})
       end
-
-    case Repo.one(query) do
-      nil ->
-        conn
-        |> put_status(:not_found)
-        |> json(%{error: "Estudio no encontrado"})
-
-      res ->
-        vencimiento = DateTime.add(DateTime.utc_now(), 2 * 24 * 60 * 60, :second)
-
-        json_data = Map.put(res, :vencimiento, vencimiento)
-
-        token = generate_token(json_data)
-
-        conn
-        |> put_status(:ok)
-        |> json(%{hash: token})
     end
   end
 
@@ -63,4 +71,12 @@ defmodule ApiWeb.GetHash do
     token
   end
 
+ defp valid_token?(conn) do
+    case get_req_header(conn, "authorization") do
+      ["Bearer " <> token] -> token == @valid_token
+      _ -> false
+    end
+  end
+
+
 end