Identity model
“The same song” is six different questions.
The system must never collapse a checksum match, a recording match, a shared composition, and a historical source into one claim.
01Exact file
Same bytesCan establish: an exact SHA-256 match.
Cannot establish: authorship or historical truth.
02Near-identical audio
Same capture, new encodingCan propose: MP3/WAV or bitrate variants of one recording.
Requires: perceptual fingerprint + threshold.
03Recording
One performance instanceCan distinguish: studio, live, demo, remix, or broadcast.
Requires: metadata and evidence review.
04Work
Composition or pieceCan connect: covers and arrangements.
Cannot assume: same performer or recording.
05Release
Issued publicationCan connect: label, date, edition, and track sequence.
Requires: release evidence.
06Source
Archival provenanceCan document: collection, donor, URL, deposit, or recovery chain.
Does not certify: every claim inside the source.