Nifty Gateway is an online digital art auction platform for non-fungible tokens founded by Duncan and Griffin Cock Foster and has since been acquired by the Winklevoss twins. The marketplace was created for buying and selling Non-fungible tokens (NFTs) or Nifties. NFT is a digital asset based on the Ethereum blockchain. NFTs are unique pieces that are irreplaceable  (non-fungible). The asset may vary from digital images to video clips, depending on the creator of the piece.