All 15 subassets are backups of the legendary 15-piece, hashed on-chain, early 2015 "Bitcoin Art" collection by Weex. The original assets: KETF A10757775179751730000 A11433176278603567000 A12286573536304806000 A1268036952489992000 A16665771309720693000 A1672758370327094000 A2382890405647249000 A2482034434046493000 A305220116359788860 A347162147702845600 A4727714767834463000 A520544706094163650 A5276228097108709000 A7714010038065172000
From the asset's metadata file