What blockchain is used by the DraftKings Marketplace? (CA)

The first NFT drops on the Marketplace are from Autograph and are being minted on Polygon. DraftKings expects that future NFTs listed on its Marketplace will likewise be minted on Polygon.   

Polygon is an Ethereum blockchain Layer 2 solution that is designed to lower transaction fees and increase transaction throughput, without sacrificing the security associated with the Ethereum blockchain.