diff --git a/app/lib/activitypub/tag_manager.rb b/app/lib/activitypub/tag_manager.rb
index c899f230a2..536b3fadd4 100644
--- a/app/lib/activitypub/tag_manager.rb
+++ b/app/lib/activitypub/tag_manager.rb
@@ -38,11 +38,23 @@ class ActivityPub::TagManager
 
     case target.object_type
     when :person
-      target.instance_actor? ? instance_actor_url : account_url(target)
+      if target.instance_actor?
+        instance_actor_url
+      elsif target.numeric_ap_id?
+        numeric_account_url(target.id)
+      else
+        account_url(target)
+      end
     when :note, :comment, :activity
-      return activity_account_status_url(target.account, target) if target.reblog?
+      if target.account.numeric_ap_id?
+        return activity_numeric_account_status_url(target.account, target) if target.reblog?
 
-      account_status_url(target.account, target)
+        numeric_account_status_url(target.account.id, target)
+      else
+        return activity_account_status_url(target.account, target) if target.reblog?
+
+        account_status_url(target.account, target)
+      end
     when :emoji
       emoji_url(target)
     when :flag
@@ -58,6 +70,10 @@ class ActivityPub::TagManager
     account_url(username: username)
   end
 
+  def uri_for_account_id(id)
+    numeric_account_url(id: id)
+  end
+
   def generate_uri_for(_target)
     URI.join(root_url, 'payloads', SecureRandom.uuid)
   end
@@ -65,49 +81,67 @@ class ActivityPub::TagManager
   def activity_uri_for(target)
     raise ArgumentError, 'target must be a local activity' unless %i(note comment activity).include?(target.object_type) && target.local?
 
-    activity_account_status_url(target.account, target)
+    target.account.numeric_ap_id? ? activity_numeric_account_status_url(target.account.id, target) : activity_account_status_url(target.account, target)
   end
 
   def replies_uri_for(target, page_params = nil)
     raise ArgumentError, 'target must be a local activity' unless %i(note comment activity).include?(target.object_type) && target.local?
 
-    account_status_replies_url(target.account, target, page_params)
+    target.account.numeric_ap_id? ? numeric_account_status_replies_url(target.account.id, target, page_params) : account_status_replies_url(target.account, target, page_params)
   end
 
   def likes_uri_for(target)
     raise ArgumentError, 'target must be a local activity' unless %i(note comment activity).include?(target.object_type) && target.local?
 
-    account_status_likes_url(target.account, target)
+    target.account.numeric_ap_id? ? numeric_account_status_likes_url(target.account.id, target) : account_status_likes_url(target.account, target)
   end
 
   def shares_uri_for(target)
     raise ArgumentError, 'target must be a local activity' unless %i(note comment activity).include?(target.object_type) && target.local?
 
-    account_status_shares_url(target.account, target)
+    target.account.numeric_ap_id? ? numeric_account_status_shares_url(target.account.id, target) : account_status_shares_url(target.account, target)
+  end
+
+  def following_uri_for(target, ...)
+    raise ArgumentError, 'target must be a local account' unless target.local?
+
+    target.numeric_ap_id? ? numeric_account_following_index_url(target.id, ...) : account_following_index_url(target, ...)
   end
 
   def followers_uri_for(target, ...)
     return target.followers_url.presence unless target.local?
 
-    account_followers_url(target, ...)
+    target.numeric_ap_id? ? numeric_account_followers_url(target.id, ...) : account_followers_url(target, ...)
   end
 
   def collection_uri_for(target, ...)
-    raise NotImplementedError unless target.local?
+    raise ArgumentError, 'target must be a local account' unless target.local?
 
-    account_collection_url(target, ...)
+    target.numeric_ap_id? ? numeric_account_collection_url(target.id, ...) : account_collection_url(target, ...)
   end
 
   def inbox_uri_for(target)
-    raise NotImplementedError unless target.local?
+    raise ArgumentError, 'target must be a local account' unless target.local?
 
-    target.instance_actor? ? instance_actor_inbox_url : account_inbox_url(target)
+    if target.instance_actor?
+      instance_actor_inbox_url
+    elsif target.numeric_ap_id?
+      numeric_account_inbox_url(target.id)
+    else
+      account_inbox_url(target)
+    end
   end
 
   def outbox_uri_for(target, ...)
-    raise NotImplementedError unless target.local?
+    raise ArgumentError, 'target must be a local account' unless target.local?
 
-    target.instance_actor? ? instance_actor_outbox_url(...) : account_outbox_url(target, ...)
+    if target.instance_actor?
+      instance_actor_outbox_url(...)
+    elsif target.numeric_ap_id?
+      numeric_account_outbox_url(target.id, ...)
+    else
+      account_outbox_url(target, ...)
+    end
   end
 
   # Primary audience of a status
diff --git a/app/models/account.rb b/app/models/account.rb
index 957ccc73c4..b607a520d2 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -182,6 +182,11 @@ class Account < ApplicationRecord
 
   update_index('accounts', :self)
 
+  def numeric_ap_id?
+    # TODO: this is a placeholder for now
+    false
+  end
+
   def local?
     domain.nil?
   end
diff --git a/app/models/concerns/account/interactions.rb b/app/models/concerns/account/interactions.rb
index 536afba17f..9cb53c44f5 100644
--- a/app/models/concerns/account/interactions.rb
+++ b/app/models/concerns/account/interactions.rb
@@ -280,8 +280,10 @@ module Account::Interactions
   def local_followers_hash
     Rails.cache.fetch("followers_hash:#{id}:local") do
       digest = "\x00" * 32
-      followers.where(domain: nil).pluck_each(:username) do |username|
-        Xorcist.xor!(digest, Digest::SHA256.digest(ActivityPub::TagManager.instance.uri_for_username(username)))
+      # TODO
+      followers.where(domain: nil).pluck_each('false as numeric_ap_id', :id, :username) do |numeric_ap_id, id, username|
+        uri = numeric_ap_id ? ActivityPub::TagManager.instance.uri_for_account_id(id) : ActivityPub::TagManager.instance.uri_for_username(username)
+        Xorcist.xor!(digest, Digest::SHA256.digest(uri))
       end
       digest.unpack1('H*')
     end