BTDigg is the first Mainline DHT search engine. It participates in the BitTorrent DHT network, supporting the network and making correspondence between magnet links and a few torrent attributes that are indexed and inserted into a database. For end users, BTDigg provides a full-text database search via a Web interface. The Web part of its search system retrieves proper information by a user's text query. The Web search supports queries in European and Asian languages. The project name is an acronym of BitTorrent Digger. It went offline in June 2016, reportedly due to index spam. However, as of 2025 the service is back online, albeit often inaccessible from standard clearnet connections because of IP filtering. The service can be accessed via the Tor network/Tor Browser.