Using info hash to download files - Troubleshooting - Forums
As data is downloaded in chunks, the client hashes each piece and compares it to the hashes stored in the .torrent file.
The string is characteristic of a hexadecimal identifier used in peer-to-peer (P2P) file sharing. In the BitTorrent protocol, every shared set of data is identified by a unique cryptographic "infohash," typically a SHA-1 hash calculated from the file's internal "info" dictionary. 1. The Role of the Infohash