Fingerprints are unique strings or IDs representing the actual audio material in order to reliably
identify the work. Some fingerprints are catalog numbers issued by the original creator or by metadata
providers like Clipland
Some fingerprints are generated by calculation against the raw audio waveform, while others being generic
random strings rely on an external index or database.
These fingerprints or unique identifiers are in concept related with watermarks, message digests and
file hashing or digit sums.