Provenance (Pad of Definitions)
From Super-wiki
Provenance
A provenance is a certificate of origin, usually stating the time and place of production, manufacture, or discovery. The provenance of works of art and antiques is very important as evidence to prove the artifact is original and has not been altered or reproduced.
Tracing the provenance of the painting owned by all the victims, with the assistance of Sarah Blake, helps Dean and Sam determine that the ghost of Melanie Merchant is the killer in 1.19 Provenance.