SFV file
The little text file of CRC checksums that tells you whether a multi-part scene release downloaded whole and intact.
An .sfv file (Simple File Verification) is one text line per file: the filename followed by its CRC-32 checksum. It shipped with scene releases, where a game or film was split into many small RAR archives (.r00, .r01 …). After downloading you ran an SFV check and saw at once whether any part had been corrupted along the way.
CRC-32 catches bit errors but is no cryptographic signature — it guards against broken transfers, not deliberate tampering. Alongside the NFO file, the SFV was part of a release's standard inventory, a scene convention rather than a formal standard.