diff --git a/app/models/activity_pub/activity.rb b/app/models/activity_pub/activity.rb
index 1147c5b8..ee555474 100644
--- a/app/models/activity_pub/activity.rb
+++ b/app/models/activity_pub/activity.rb
@@ -20,6 +20,8 @@ class ActivityPub
     has_one :object, through: :activity_pub
 
     validates :activity_pub_id, presence: true
+    # Las actividades son únicas con respecto a su estado
+    validates :uri, presence: true, uniqueness: { scope: :activity_pub_id, message: 'estado duplicado' }
 
     # Siempre en orden descendiente para saber el último estado
     default_scope -> { order(created_at: :desc) }
diff --git a/app/models/activity_pub/actor.rb b/app/models/activity_pub/actor.rb
index 0a39dcde..919bc5e0 100644
--- a/app/models/activity_pub/actor.rb
+++ b/app/models/activity_pub/actor.rb
@@ -15,6 +15,9 @@ class ActivityPub
     has_many :activities
     has_many :remote_flags
 
+    # Les actores son únicxs a toda la base de datos
+    validates :uri, presence: true, uniqueness: true
+
     # Obtiene el nombre de la Actor como mención, solo si obtuvimos el
     # contenido de antemano.
     #
diff --git a/app/models/activity_pub/concerns/json_ld_concern.rb b/app/models/activity_pub/concerns/json_ld_concern.rb
index bc30330c..282027df 100644
--- a/app/models/activity_pub/concerns/json_ld_concern.rb
+++ b/app/models/activity_pub/concerns/json_ld_concern.rb
@@ -6,8 +6,6 @@ class ActivityPub
       extend ActiveSupport::Concern
 
       included do
-        validates :uri, presence: true, uniqueness: true
-
         # Cuando asignamos contenido, obtener la URI si no lo hicimos ya
         before_save :uri_from_content!, unless: :uri?
 
diff --git a/app/models/activity_pub/object.rb b/app/models/activity_pub/object.rb
index c196160f..15b07bee 100644
--- a/app/models/activity_pub/object.rb
+++ b/app/models/activity_pub/object.rb
@@ -5,6 +5,9 @@ class ActivityPub
   class Object < ApplicationRecord
     include ActivityPub::Concerns::JsonLdConcern
 
+    # Los objetos son únicos a toda la base de datos
+    validates :uri, presence: true, uniqueness: true
+
     has_many :activity_pubs, as: :object
 
     # Encontrar le Actor por su relación con el objeto