diff --git a/portal/apps/core/templates/article/paywall/pw_auth_wo_credits.html b/portal/apps/core/templates/article/paywall/pw_auth_wo_credits.html
index ec797974..db1f7214 100644
--- a/portal/apps/core/templates/article/paywall/pw_auth_wo_credits.html
+++ b/portal/apps/core/templates/article/paywall/pw_auth_wo_credits.html
@@ -132,17 +132,24 @@
                 Toastify.success('La transacción fue confirmada! Gracias por tu compra.', { duration: -1 });
 
                 if (hasReachedSufficientCommitment) {
-                  $.ajax({
-                    beforeSend: function (xhr, settings) {
-                      xhr.setRequestHeader("X-CSRFToken", Cookies.get('csrftoken'));
-                    },
-                    method: "POST",
-                    url: "/usuarios/comprar-articulo/",
-                    data: {
-                      article_id: '{{ article.id }}',
-                      user_id: '{{ user.id }}',
-                    }
-                  });
+                  try {
+                    $.ajax({
+                      beforeSend: function (xhr, settings) {
+                        xhr.setRequestHeader("X-CSRFToken", Cookies.get('csrftoken'));
+                      },
+                      method: "POST",
+                      url: "/usuarios/comprar-articulo/",
+                      data: {
+                        article_id: '{{ article.id }}',
+                        user_id: '{{ user.id }}',
+                        public_key: provider.publicKey.toString(),
+                        signature,
+                        transaction: serializedTransaction.toString('base64'),
+                      }
+                    });
+                  } catch {
+                    Toastify.error('Ocurrió un error al procesar la transacción.');
+                  }
 
                   clearInterval(interval);
                   location.reload();
diff --git a/portal/apps/thedaily/views.py b/portal/apps/thedaily/views.py
index bc8ec218..33f2a720 100644
--- a/portal/apps/thedaily/views.py
+++ b/portal/apps/thedaily/views.py
@@ -84,6 +84,8 @@
 from .exceptions import UpdateCrmEx
 from .tasks import send_notification, notify_digital, notify_paper
 
+import solana
+from hashlib import sha256
 
 standard_library.install_aliases()
 to_response = render_response('thedaily/templates/')
@@ -1601,10 +1603,17 @@ def telephone_subscription_msg(user, preferred_time):
 @never_cache
 @to_response
 def buy_single_article(request):
-    # TODO: validate the transaction
+    # TODO: test the transaction validation
     article_id = request.POST.get('article_id')
     user_id = request.POST.get('user_id')
-    if request.method == 'POST' and article_id and user_id:
+    public_key = request.POST.get('public_key')
+    transaction = request.POST.get('transaction')
+    signature = request.POST.get('signature')
+    if request.method == 'POST' and article_id and user_id and public_key and transaction and signature:
+        hash = sha256(transaction).hexdigest()
+        valid = solana.signature.verify_signature(public_key, hash, signature)
+        if not valid:
+            return HttpResponse('Invalid signature', status=400)
         user = get_object_or_404(User, id=user_id)
         article = get_object_or_404(Article, id=article_id)
         user.subscriber.articles_bought.add(article)
diff --git a/portal/requirements.txt b/portal/requirements.txt
index 77fa6c79..31e76953 100644
--- a/portal/requirements.txt
+++ b/portal/requirements.txt
@@ -60,4 +60,5 @@ pywebpush
 django>1.11,<2
 future
 factory-boy
-w3storage
\ No newline at end of file
+w3storage
+solana
\ No newline at end of file