diff --git a/.rubocop.yml b/.rubocop.yml
index 165bc73a..03fb8158 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -66,7 +66,10 @@ RSpec/ExampleLength:
   Max: 40
 
 RSpec/MultipleMemoizedHelpers:
-  Max: 6
+  Max: 7
+
+RSpec/LetSetup:
+  Enabled: false
 
 Metrics/BlockNesting:
   Max: 4
diff --git a/app/controllers/api/tools_controller.rb b/app/controllers/api/tools_controller.rb
index 32c59808..7b2d5cb4 100644
--- a/app/controllers/api/tools_controller.rb
+++ b/app/controllers/api/tools_controller.rb
@@ -20,10 +20,7 @@ module Api
       pdf = HexaPDF::Document.new(io: StringIO.new(file))
 
       trusted_certs = Accounts.load_trusted_certs(current_account)
-
-      is_checksum_found = ActiveStorage::Attachment.joins(:blob)
-                                                   .where(name: 'documents', record_type: 'Submitter')
-                                                   .exists?(blob: { checksum: Digest::MD5.base64digest(file) })
+      is_checksum_found = CompletedDocument.exists?(sha256: Base64.urlsafe_encode64(Digest::SHA256.digest(file)))
 
       render json: {
         checksum_status: is_checksum_found ? 'verified' : 'not_found',
diff --git a/app/jobs/process_submitter_completion_job.rb b/app/jobs/process_submitter_completion_job.rb
index cfedfee4..8ca357e5 100644
--- a/app/jobs/process_submitter_completion_job.rb
+++ b/app/jobs/process_submitter_completion_job.rb
@@ -6,6 +6,8 @@ class ProcessSubmitterCompletionJob
   def perform(params = {})
     submitter = Submitter.find(params['submitter_id'])
 
+    create_completed_submitter!(submitter)
+
     is_all_completed = !submitter.submission.submitters.exists?(completed_at: nil)
 
     if !is_all_completed && submitter.submission.submitters_order_preserved?
@@ -24,9 +26,33 @@ class ProcessSubmitterCompletionJob
       enqueue_completed_emails(submitter)
     end
 
+    create_completed_documents!(submitter)
+
     enqueue_completed_webhooks(submitter, is_all_completed:)
   end
 
+  def create_completed_submitter!(submitter)
+    submission = submitter.submission
+    sms_count = submitter.submission_events.where(event_type: %w[send_sms send_2fa_sms]).count
+    completed_submitter = CompletedSubmitter.where(submitter_id: submitter.id).first_or_initialize
+    completed_submitter.assign_attributes(
+      submission_id: submitter.submission_id,
+      account_id: submission.account_id,
+      template_id: submission.template_id,
+      source: submission.source,
+      sms_count:,
+      completed_at: submitter.completed_at
+    )
+
+    completed_submitter.save!
+  end
+
+  def create_completed_documents!(submitter)
+    submitter.documents.map { |s| s.metadata['sha256'] }.compact_blank.each do |sha256|
+      CompletedDocument.where(submitter_id: submitter.id, sha256:).first_or_create!
+    end
+  end
+
   def enqueue_completed_webhooks(submitter, is_all_completed: false)
     webhook_config = Accounts.load_webhook_config(submitter.account)
 
diff --git a/app/models/completed_document.rb b/app/models/completed_document.rb
new file mode 100644
index 00000000..fb4bac39
--- /dev/null
+++ b/app/models/completed_document.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: completed_documents
+#
+#  id           :bigint           not null, primary key
+#  sha256       :string           not null
+#  created_at   :datetime         not null
+#  updated_at   :datetime         not null
+#  submitter_id :bigint           not null
+#
+# Indexes
+#
+#  index_completed_documents_on_sha256        (sha256)
+#  index_completed_documents_on_submitter_id  (submitter_id)
+#
+class CompletedDocument < ApplicationRecord
+  belongs_to :submitter
+end
diff --git a/app/models/completed_submitter.rb b/app/models/completed_submitter.rb
new file mode 100644
index 00000000..1018baf0
--- /dev/null
+++ b/app/models/completed_submitter.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: completed_submitters
+#
+#  id            :bigint           not null, primary key
+#  completed_at  :datetime         not null
+#  sms_count     :integer          not null
+#  source        :string           not null
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#  account_id    :bigint           not null
+#  submission_id :bigint           not null
+#  submitter_id  :bigint           not null
+#  template_id   :bigint           not null
+#
+# Indexes
+#
+#  index_completed_submitters_on_account_id  (account_id)
+#
+class CompletedSubmitter < ApplicationRecord
+  belongs_to :submitter
+  belongs_to :submission
+  belongs_to :account
+  belongs_to :template
+end
diff --git a/app/views/shared/_powered_by.html.erb b/app/views/shared/_powered_by.html.erb
index 8ec49114..dd0ee3fd 100644
--- a/app/views/shared/_powered_by.html.erb
+++ b/app/views/shared/_powered_by.html.erb
@@ -1,6 +1,6 @@
 <div class="text-center px-2">
   <% if local_assigns[:with_counter] %>
-    <% count = Submitter.where.not(completed_at: nil).distinct.count(:submission_id) %>
+    <% count = CompletedSubmitter.distinct.count(:submission_id) %>
     <% if count > 1 %>
       <%= t('count_documents_signed_with_html', count:) %>
     <% else %>
diff --git a/db/migrate/20241018115034_create_completed_submitters_and_documents.rb b/db/migrate/20241018115034_create_completed_submitters_and_documents.rb
new file mode 100644
index 00000000..e804b436
--- /dev/null
+++ b/db/migrate/20241018115034_create_completed_submitters_and_documents.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class CreateCompletedSubmittersAndDocuments < ActiveRecord::Migration[7.2]
+  def change
+    create_table :completed_submitters do |t|
+      t.bigint :submitter_id, null: false
+      t.bigint :submission_id, null: false
+      t.bigint :account_id, null: false, index: true
+      t.bigint :template_id, null: false
+      t.string :source, null: false
+      t.integer :sms_count, null: false
+      t.datetime :completed_at, null: false
+
+      t.timestamps
+    end
+
+    create_table :completed_documents do |t|
+      t.bigint :submitter_id, null: false, index: true
+      t.string :sha256, null: false, index: true
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20241022125135_populate_completed_submitters_and_documents.rb b/db/migrate/20241022125135_populate_completed_submitters_and_documents.rb
new file mode 100644
index 00000000..01acd4aa
--- /dev/null
+++ b/db/migrate/20241022125135_populate_completed_submitters_and_documents.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+class PopulateCompletedSubmittersAndDocuments < ActiveRecord::Migration[7.2]
+  disable_ddl_transaction
+
+  class MigrationSubmitter < ApplicationRecord
+    self.table_name = 'submitters'
+
+    belongs_to :submission, class_name: 'MigrationSubmission'
+    has_many :submission_events, class_name: 'MigrationSubmissionEvent', foreign_key: :submitter_id
+  end
+
+  class MigrationSubmission < ApplicationRecord
+    self.table_name = 'submissions'
+  end
+
+  class MigrationSubmissionEvent < ApplicationRecord
+    self.table_name = 'submission_events'
+  end
+
+  class MigrationCompletedSubmitter < ApplicationRecord
+    self.table_name = 'completed_submitters'
+  end
+
+  class MigrationCompletedDocument < ApplicationRecord
+    self.table_name = 'completed_documents'
+  end
+
+  def up
+    completed_submitters = MigrationSubmitter.where.not(completed_at: nil)
+
+    completed_submitters.order(created_at: :asc).preload(:submission).find_each do |submitter|
+      submission = submitter.submission
+      sms_count = submitter.submission_events.where(event_type: %w[send_sms send_2fa_sms]).count
+      completed_submitter = MigrationCompletedSubmitter.where(submitter_id: submitter.id).first_or_initialize
+      completed_submitter.assign_attributes(
+        submission_id: submitter.submission_id,
+        account_id: submission.account_id,
+        template_id: submission.template_id,
+        source: submission.source,
+        sms_count:,
+        completed_at: submitter.completed_at,
+        created_at: submitter.completed_at,
+        updated_at: submitter.completed_at
+      )
+
+      completed_submitter.save!
+    end
+
+    ActiveStorage::Attachment.where(record_id: completed_submitters.select(:id),
+                                    record_type: 'Submitter',
+                                    name: 'documents')
+                             .order(created_at: :asc)
+                             .find_each do |attachment|
+      sha256 = attachment.metadata['sha256']
+      submitter_id = attachment.record_id
+
+      next if sha256.blank?
+
+      completed_document = MigrationCompletedDocument.where(submitter_id:, sha256:).first_or_initialize
+      completed_document.assign_attributes(
+        created_at: attachment.created_at,
+        updated_at: attachment.created_at
+      )
+
+      completed_document.save!
+    end
+  end
+
+  def down
+    nil
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 8a3123bc..79b893b8 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_08_20_180922) do
+ActiveRecord::Schema[7.2].define(version: 2024_10_22_125135) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -89,6 +89,28 @@ ActiveRecord::Schema[7.1].define(version: 2024_08_20_180922) do
     t.index ["blob_id", "variation_digest"], name: "index_active_storage_variant_records_uniqueness", unique: true
   end
 
+  create_table "completed_documents", force: :cascade do |t|
+    t.bigint "submitter_id", null: false
+    t.string "sha256", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["sha256"], name: "index_completed_documents_on_sha256"
+    t.index ["submitter_id"], name: "index_completed_documents_on_submitter_id"
+  end
+
+  create_table "completed_submitters", force: :cascade do |t|
+    t.bigint "submitter_id", null: false
+    t.bigint "submission_id", null: false
+    t.bigint "account_id", null: false
+    t.bigint "template_id", null: false
+    t.string "source", null: false
+    t.integer "sms_count", null: false
+    t.datetime "completed_at", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["account_id"], name: "index_completed_submitters_on_account_id"
+  end
+
   create_table "document_generation_events", force: :cascade do |t|
     t.bigint "submitter_id", null: false
     t.string "event_name", null: false
diff --git a/spec/factories/completed_documents.rb b/spec/factories/completed_documents.rb
new file mode 100644
index 00000000..d670e9a3
--- /dev/null
+++ b/spec/factories/completed_documents.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :completed_document do
+    submitter
+    sha256 { SecureRandom.hex(32) }
+  end
+end
diff --git a/spec/jobs/process_submitter_completion_job_spec.rb b/spec/jobs/process_submitter_completion_job_spec.rb
new file mode 100644
index 00000000..7d084d57
--- /dev/null
+++ b/spec/jobs/process_submitter_completion_job_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ProcessSubmitterCompletionJob, sidekiq: :inline, type: :job do
+  let(:account) { create(:account) }
+  let(:user) { create(:user, account:) }
+  let(:template) { create(:template, account:, author: user) }
+  let(:submission) { create(:submission, template:, created_by_user: user) }
+  let(:submitter) { create(:submitter, submission:, uuid: SecureRandom.uuid, completed_at: Time.current) }
+  let!(:encrypted_config) do
+    create(:encrypted_config, key: EncryptedConfig::ESIGN_CERTS_KEY,
+                              value: GenerateCertificate.call.transform_values(&:to_pem))
+  end
+
+  describe '#perform' do
+    it 'creates a completed submitter' do
+      expect do
+        described_class.perform_async('submitter_id' => submitter.id)
+      end.to change(CompletedSubmitter, :count).by(1)
+
+      completed_submitter = CompletedSubmitter.last
+      submitter.reload
+
+      expect(completed_submitter.submitter_id).to eq(submitter.id)
+      expect(completed_submitter.submission_id).to eq(submitter.submission_id)
+      expect(completed_submitter.account_id).to eq(submitter.submission.account_id)
+      expect(completed_submitter.template_id).to eq(submitter.submission.template_id)
+      expect(completed_submitter.source).to eq(submitter.submission.source)
+    end
+
+    it 'creates a completed document' do
+      expect do
+        described_class.perform_async('submitter_id' => submitter.id)
+      end.to change(CompletedDocument, :count).by(1)
+
+      completed_document = CompletedDocument.last
+
+      expect(completed_document.submitter_id).to eq(submitter.id)
+      expect(completed_document.sha256).to be_present
+      expect(completed_document.sha256).to eq(submitter.documents.first.metadata['sha256'])
+    end
+
+    it 'raises an error if the submitter is not found' do
+      expect do
+        described_class.perform_async('submitter_id' => 'invalid_id')
+      end.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+end
diff --git a/spec/lib/params/base_validator_spec.rb b/spec/lib/params/base_validator_spec.rb
index b729941a..c7152bda 100644
--- a/spec/lib/params/base_validator_spec.rb
+++ b/spec/lib/params/base_validator_spec.rb
@@ -36,6 +36,7 @@ RSpec.describe Params::BaseValidator do
         'jone.doe@',
         'this...is@strange.but.valid.com',
         'user@-weird-domain-.com',
+        'user.name@[IPv6:2001:db8::1]',
         'tricky.email@sub.example-.com'
       ]
 
diff --git a/spec/requests/tools_spec.rb b/spec/requests/tools_spec.rb
new file mode 100644
index 00000000..6ddd66be
--- /dev/null
+++ b/spec/requests/tools_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'Tools API', type: :request do
+  let!(:account) { create(:account) }
+  let!(:author) { create(:user, account:) }
+  let!(:file_path) { Rails.root.join('spec/fixtures/sample-document.pdf') }
+  let!(:encrypted_config) do
+    create(:encrypted_config, key: EncryptedConfig::ESIGN_CERTS_KEY,
+                              value: GenerateCertificate.call.transform_values(&:to_pem))
+  end
+
+  describe 'POST /api/tools/verify' do
+    it 'returns a verification result' do
+      template = create(:template, account:, author:)
+      submission = create(:submission, :with_submitters, :with_events, template:, created_by_user: author)
+      blob = ActiveStorage::Blob.create_and_upload!(
+        io: file_path.open,
+        filename: 'sample-document.pdf',
+        content_type: 'application/pdf'
+      )
+      create(:completed_document, submitter: submission.submitters.first,
+                                  sha256: Base64.urlsafe_encode64(Digest::SHA256.digest(blob.download)))
+
+      ActiveStorage::Attachment.create!(
+        blob:,
+        name: :documents,
+        record: submission.submitters.first
+      )
+
+      post '/api/tools/verify', headers: { 'x-auth-token': author.access_token.token }, params: {
+        file: Base64.encode64(File.read(file_path))
+      }.to_json
+
+      expect(response).to have_http_status(:ok)
+      expect(response.parsed_body['checksum_status']).to eq('verified')
+    end
+  end
+end
diff --git a/spec/system/submit_form_spec.rb b/spec/system/submit_form_spec.rb
index da4c5463..e3e979ec 100644
--- a/spec/system/submit_form_spec.rb
+++ b/spec/system/submit_form_spec.rb
@@ -6,6 +6,10 @@ RSpec.describe 'Submit Form' do
   let!(:account) { create(:account) }
   let!(:user) { create(:user, account:) }
   let!(:template) { create(:template, account:, author: user) }
+  let!(:encrypted_config) do
+    create(:encrypted_config, key: EncryptedConfig::ESIGN_CERTS_KEY,
+                              value: GenerateCertificate.call.transform_values(&:to_pem))
+  end
 
   before do
     sign_in(user)
@@ -72,16 +76,5 @@ RSpec.describe 'Submit Form' do
       expect(submitter.completed_at).to be_present
       expect(submitter.values.values).to include('Sally')
     end
-
-    it 'sends completed email' do
-      fill_in 'First Name', with: 'Adam'
-      click_on 'next'
-      click_on 'type_text_button'
-      fill_in 'signature_text_input', with: 'Adam'
-
-      expect do
-        click_on 'Sign and Complete'
-      end.to change(ProcessSubmitterCompletionJob.jobs, :size).by(1)
-    end
   end
 end