The non-fungible token (NFT) based on the album cover of rapper Jay-Z's 1996 debut album 'Reasonable Doubt' is being auctioned at Sotheby's. The NFT, whose bidding started at $1,000, is named 'Heir to the Throne' and is meant to commemorate the 25th anniversary of the album's release. Sotheby's will accept Bitcoin and Ethereum as payment options.