diff --git a/ereuse_devicehub/resources/action/views/documents.py b/ereuse_devicehub/resources/action/views/documents.py
index 65c20857..c21f9d42 100644
--- a/ereuse_devicehub/resources/action/views/documents.py
+++ b/ereuse_devicehub/resources/action/views/documents.py
@@ -13,6 +13,7 @@ from ereuse_devicehub.resources.action.models import ToErased
 from ereuse_devicehub.resources.documents.models import Document
 from ereuse_devicehub.resources.device.models import DataStorage 
 from ereuse_devicehub.resources.documents.schemas import Document as sh_document
+from ereuse_devicehub.resources.hash_reports import ReportHash
 
 
 class ErasedView():
@@ -39,6 +40,9 @@ class ErasedView():
         doc_data['type'] = 'ToErased'
         self.document = Document(**doc_data)
         db.session.add(self.document)
+        
+        db_hash = ReportHash(hash3=self.document.file_hash)
+        db.session.add(db_hash)
 
     def insert_action(self, data):
         [data.pop(x, None) for x in ['url', 'documentId', 'filename', 'hash']]
diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index ea585785..35937101 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -696,6 +696,25 @@ class Computer(Device):
             if privacy
         )
 
+    @property
+    def external_document_erasure(self):
+        """Returns the external ``DataStorage`` proof of erasure.
+        """
+        from ereuse_devicehub.resources.action.models import ToErased
+        urls = set()
+        try:
+            ev = self.last_action_of(ToErased)
+            urls.add(ev.document.url.to_text())
+        except LookupError:
+            pass
+
+        for comp in self.components:
+            if isinstance(comp, DataStorage):
+                doc = comp.external_document_erasure
+                if doc:
+                    urls.add(doc)
+        return urls
+
     def add_mac_to_hid(self, components_snap=None):
         """Returns the Naming.hid with the first mac of network adapter, 
         following an alphabetical order.
@@ -879,6 +898,17 @@ class DataStorage(JoinedComponentTableMixin, Component):
             v += ' – {} GB'.format(self.size // 1000 if self.size else '?')
         return v
 
+    @property
+    def external_document_erasure(self):
+        """Returns the external ``DataStorage`` proof of erasure.
+        """
+        from ereuse_devicehub.resources.action.models import ToErased
+        try:
+            ev = self.last_action_of(ToErased)
+            return ev.document.url.to_text()
+        except LookupError:
+            return None
+
 
 class HardDrive(DataStorage):
     pass
diff --git a/ereuse_devicehub/resources/documents/documents.py b/ereuse_devicehub/resources/documents/documents.py
index 26e94292..8e8db6ff 100644
--- a/ereuse_devicehub/resources/documents/documents.py
+++ b/ereuse_devicehub/resources/documents/documents.py
@@ -90,6 +90,7 @@ class DocumentView(DeviceView):
             res = flask.make_response(template)
         return res
 
+
     @staticmethod
     def erasure(query: db.Query):
         def erasures():
@@ -114,6 +115,34 @@ class DocumentView(DeviceView):
         }
         return flask.render_template('documents/erasure.html', **params)
 
+class ExternalErasureDocumentView(DeviceView):
+    @cache(datetime.timedelta(minutes=1))
+    def find(self, args: dict):
+        query = (x for x in self.query(args) if x.owner_id == g.user.id)
+        return self.generate_post_csv(query)
+
+    def generate_post_csv(self, query):
+        """Get device query and put information in csv format."""
+        data = StringIO()
+        cw = csv.writer(data, delimiter=';', lineterminator="\n", quotechar='"')
+        cw.writerow(['Urls'])
+        for device in query:
+            if isinstance(device, devs.Computer):
+                urls = device.external_document_erasure
+                if urls:
+                    cw.writerow(urls)
+            elif isinstance(device, devs.DataStorage):
+                url = device.external_document_erasure
+                if url:
+                    cw.writerow(set(url))
+                    
+        bfile = data.getvalue().encode('utf-8')
+        output = make_response(bfile)
+        insert_hash(bfile)
+        output.headers['Content-Disposition'] = 'attachment; filename=export_urls_external_proof.csv'
+        output.headers['Content-type'] = 'text/csv'
+        return output
+
 
 class DevicesDocumentView(DeviceView):
     @cache(datetime.timedelta(minutes=1))
@@ -291,7 +320,6 @@ class InternalStatsView(DeviceView):
             evs.Action.type.in_(('Snapshot', 'Live', 'Allocate', 'Deallocate')))
         return self.generate_post_csv(query)
 
-
     def generate_post_csv(self, query):
         d = {}
         for ac in query:
@@ -417,6 +445,12 @@ class DocumentDef(Resource):
         self.add_url_rule('/internalstats/', defaults=d, view_func=internalstats_view,
                           methods=get)
 
+        externalErasureDocument_view = ExternalErasureDocumentView.as_view(
+            'ExternalErasureDocumentView', definition=self, auth=app.auth)
+        externalErasureDocument_view = app.auth.requires_auth(externalErasureDocument_view)
+        self.add_url_rule('/externalErasureDocuments/', defaults=d,
+                          view_func=externalErasureDocument_view, methods=get)
+
         actions_view = ActionsDocumentView.as_view('ActionsDocumentView',
                                                    definition=self,
                                                    auth=app.auth)
diff --git a/tests/test_action.py b/tests/test_action.py
index 951e91ab..bfdcebd2 100644
--- a/tests/test_action.py
+++ b/tests/test_action.py
@@ -6,6 +6,7 @@ import copy
 import pytest
 
 from datetime import datetime, timedelta
+from io import BytesIO
 from dateutil.tz import tzutc
 from decimal import Decimal
 from typing import Tuple, Type
@@ -2412,10 +2413,13 @@ def test_trade_case14(user: UserClient, user2: UserClient):
 
 @pytest.mark.mvp
 @pytest.mark.usefixtures(conftest.app_context.__name__)
-def test_action_web_erase(user: UserClient):
-    # import pdb; pdb.set_trace()
+def test_action_web_erase(user: UserClient, client: Client):
+    import hashlib
+    from ereuse_devicehub.resources.documents import documents
+    bfile = BytesIO(b'abc')
+    hash3 = hashlib.sha3_256(bfile.read()).hexdigest()
     snap, _ = user.post(file('acer.happy.battery.snapshot'), res=models.Snapshot)
-    request = {'type': 'ToErased', 'devices': [snap['device']['id']], 'name': 'borrado universal', 'severity': 'Info', 'description': 'nada que describir', 'url': 'http://www.google.com/', 'documentId': '33', 'endTime': '2021-07-07T22:00:00.000Z', 'filename': 'Certificado de borrado1.pdf', 'hash': 'fedbcbd057d25df9915ca9758b7537794148b896b66b3bbc972fe966dcced34b'}
+    request = {'type': 'ToErased', 'devices': [snap['device']['id']], 'name': 'borrado universal', 'severity': 'Info', 'description': 'nada que describir', 'url': 'http://www.google.com/', 'documentId': '33', 'endTime': '2021-07-07T22:00:00.000Z', 'filename': 'Certificado de borrado1.pdf', 'hash': hash3}
    
     user.post(res=models.Action, data=request)
     action = models.ToErased.query.one()
@@ -2423,3 +2427,14 @@ def test_action_web_erase(user: UserClient):
         assert action in dev.actions
 
     assert action.document.file_hash == request['hash']
+
+    bfile = BytesIO(b'abc')
+    response, _ = client.post(res=documents.DocumentDef.t,
+            item='stamps/',
+            content_type='multipart/form-data',
+            accept='text/html',
+            data={'docUpload': [(bfile, 'example.csv')]},
+            status=200)
+    assert "alert alert-info" in response
+    assert "100% coincidence." in response
+    assert not "alert alert-danger" in response
diff --git a/tests/test_basic.py b/tests/test_basic.py
index c04e8fb6..18973f6a 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -40,6 +40,7 @@ def test_api_docs(client: Client):
         '/documents/erasures/',
         '/documents/devices/',
         '/documents/stamps/',
+        '/documents/externalErasureDocuments/',
         '/documents/wbconf/{wbtype}',
         '/documents/internalstats/',
         '/documents/stock/',