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Keep recording and release identifiers consistent when transferring a catalogue.
An ISRC identifies a sound recording, while a UPC identifies a release product such as a single or album. Neither identifier by itself proves ownership.
When transferring the same recording, keep its existing ISRC with matching metadata. Supply any existing UPC and explain whether the release package is unchanged.
Store codes alongside titles, artist names, versions and original release dates. Avoid guessing codes or reusing a recording identifier for unrelated audio.