diff --git a/jabberfr/forms.py b/jabberfr/forms.py
index c37388e..2f8c889 100644
--- a/jabberfr/forms.py
+++ b/jabberfr/forms.py
@@ -2,6 +2,7 @@ from django import forms
 from django.utils.safestring import mark_safe
 from django.core.validators import RegexValidator, URLValidator
 from jabberfr.validators import validate_jid_userpart, validate_jid
+from jabberfr.utils import pick_captcha, validate_captcha
 
 USERNAME_HELP = """
 <ul>
@@ -116,6 +117,13 @@ class InscriptionForm(forms.Form):
         if choices:
             self.fields['server'].widget.choices = choices
 
+    def clean(self):
+        cleaned_data = super().clean()
+        if cleaned_data['password'] != cleaned_data['confirm_password']:
+            self.add_error(
+                'confirm_password', 'Les mots de passe ne correspondent pas.'
+            )
+
 
 class AdhesionForm(forms.Form):
     surname = forms.CharField(
@@ -157,3 +165,9 @@ class AdhesionForm(forms.Form):
         self.fields['captcha'].help_text = mark_safe(
             f'\n<br/>Répondez à cette question : {question}'
         )
+
+    def clean(self):
+        cleaned_data = super().clean()
+        if not validate_captcha(cleaned_data):
+            self.add_error('captcha', 'Êtes-vous un robot ?')
+            self.reset_captcha(*pick_captcha())
diff --git a/jabberfr/settings.py b/jabberfr/settings.py
index 042f1b2..e331776 100644
--- a/jabberfr/settings.py
+++ b/jabberfr/settings.py
@@ -117,6 +117,9 @@ STATICFILES_DIRS = [
     BASE_DIR / 'static'
 ]
 
+# Prosody mod_register_json token
+REGISTRATION_TOKEN = 'CHANGEME'
+
 # To override in local settings
 CAPTCHA_QUESTIONS = [
     ('1 + 1 ?', '2'),
diff --git a/jabberfr/templates/inscription_success.html b/jabberfr/templates/inscription_success.html
new file mode 100644
index 0000000..b0f5d0a
--- /dev/null
+++ b/jabberfr/templates/inscription_success.html
@@ -0,0 +1,9 @@
+{% extends "page_model.html" %}
+
+{% block content %}
+<main>
+<h2 class="center">Inscription à un serveur Jabber par JabberFR</h2>
+<p>Votre compte <code>{{ jid }}</code> a été créé avec succès !</p>
+<hr />
+</main>
+{% endblock %}
diff --git a/jabberfr/utils.py b/jabberfr/utils.py
index c2fc7cb..289cc77 100644
--- a/jabberfr/utils.py
+++ b/jabberfr/utils.py
@@ -2,11 +2,16 @@ import logging
 import xml.etree.ElementTree as ET
 from asyncio import gather, get_event_loop
 from random import randint
+from uuid import uuid4
 
 from aiodns import DNSResolver
 from aiohttp import ClientSession, ClientTimeout
-from django import forms
+from aiohttp.web import (
+    HTTPConflict,
+    HTTPServiceUnavailable,
+)
 from django.conf import settings
+from slixmpp import JID, InvalidJID
 
 log = logging.getLogger(__name__)
 
@@ -14,6 +19,9 @@ BASE_MUC_URL = 'http://[::1]:5280/muc_list/?'
 
 DOMAINS_URL = 'https://jabberfr.org/domains.xml'
 
+REGISTER_URL = 'http://[::1]:5280/register_account/'
+VERIFY_URL = REGISTER_URL + 'verify'
+
 
 async def get_chatrooms(*, limit: int = 25, order: str = 'users') -> str:
     params = {
@@ -108,37 +116,76 @@ async def check_dns_config(data: dict) -> list[str]:
     return errors
 
 
-def check_passwords(form: forms.Form) -> bool:
-    if form.cleaned_data['password'] != form.cleaned_data['confirm_password']:
-        form.add_error(
-            'confirm_password', 'Les mots de passe ne correspondent pas'
-        )
-        return False
-    return True
-
-
-
 def pick_captcha() -> tuple[str, str]:
     choice = randint(0, len(settings.CAPTCHA_QUESTIONS) - 1)
     question = settings.CAPTCHA_QUESTIONS[choice][0]
     return str(choice), question
 
 
-def validate_captcha(form: forms.Form) -> bool:
-    data = form.cleaned_data
-    print(data)
+def validate_captcha(data: dict) -> bool:
     try:
         captcha_id = data['captcha_id']
         if captcha_id < 0 or captcha_id >= len(settings.CAPTCHA_QUESTIONS):
             raise ValueError
     except ValueError:
-        form.add_error('captcha', 'Êtes-vous un robot ?')
         return False
     question_tup = settings.CAPTCHA_QUESTIONS[captcha_id]
     if question_tup is None:
-        form.add_error('captcha', 'Êtes-vous un robot ?')
         return False
     if question_tup[1] != data['captcha']:
-        form.add_error('captcha', 'Êtes-vous un robot ?')
         return False
     return True
+
+
+class RegistrationError(Exception):
+    def __init__(self, text):
+        super().__init__()
+        self.text = text
+
+
+async def register_account(username: str, host: str, password: str, ip: str):
+    """Register an account using prosody’s mod_register_json"""
+    try:
+        jid = JID(f'{username}@{host}')
+    except InvalidJID:
+        return
+    headers = {'Host': jid.server}
+    # we don’t care about the email feature
+    email = uuid4().hex + '@example.com'
+    payload = {
+        'username': jid.user,
+        'password': password,
+        'ip': ip,
+        'auth_token': settings.REGISTRATION_TOKEN,
+        'mail': email,
+    }
+
+    tmout = ClientTimeout(total=10)
+    async with ClientSession(raise_for_status=True, timeout=tmout) as session:
+        try:
+            async with session.post(REGISTER_URL, json=payload, headers=headers) as resp:
+                uid = await resp.text()
+            async with session.post(VERIFY_URL, data={'uid': uid}, headers=headers):
+                pass
+        except HTTPConflict:
+            raise RegistrationError(
+                'Ce nom d’utilisateur n’est pas disponible.'
+            )
+        except HTTPServiceUnavailable:
+            raise RegistrationError(
+                'Vous avez fait trop de demandes, veuillez revenir plus tard.'
+            )
+        except BaseException:
+            raise RegistrationError(
+                'Erreur inconnue. (serveur indisponible ?)'
+            )
+
+
+def get_client_ip(request) -> str:
+    """Get a client IP"""
+    x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
+    if x_forwarded_for:
+        ip = x_forwarded_for.split(',')[0]
+    else:
+        ip = request.META.get('REMOTE_ADDR')
+    return ip
diff --git a/jabberfr/views.py b/jabberfr/views.py
index 3e950b0..b1014e6 100644
--- a/jabberfr/views.py
+++ b/jabberfr/views.py
@@ -6,9 +6,11 @@ from jabberfr.utils import (
     get_chatrooms,
     get_custom_domains,
     check_dns_config,
-    check_passwords,
     pick_captcha,
-    validate_captcha
+    validate_captcha,
+    register_account,
+    RegistrationError,
+    get_client_ip,
 )
 
 log = logging.getLogger(__name__)
@@ -79,8 +81,24 @@ async def inscription(request, domain=None):
     if request.method == 'POST':
         form = InscriptionForm(request.POST, custom_choices=choices)
         context['form'] = form
-        if form.is_valid() and check_passwords(form):
-            pass
+        if form.is_valid():
+            try:
+                data = form.cleaned_data
+                await register_account(
+                    data['username'],
+                    data['server'],
+                    data['password'],
+                    get_client_ip(request),
+                )
+            except RegistrationError as exc:
+                form.add_error('__all__', exc.text)
+            else:
+                context['jid'] = data['username'] + '@' + data['server']
+                return render(
+                    request,
+                    'inscription_success.html',
+                    context=context
+                )
     else:
         form = InscriptionForm(custom_choices=choices)
         context['form'] = form
@@ -92,10 +110,8 @@ async def adhesion(request):
     if request.method == 'POST':
         form = AdhesionForm(request.POST)
         context['form'] = form
-        if form.is_valid() and validate_captcha(form):
+        if form.is_valid():
             return render(request, 'adhesion_success.html', context=context)
-        else:
-            form.reset_captcha(*pick_captcha())
     else:
         form = AdhesionForm(captcha=pick_captcha())
         context['form'] = form