A non-fungible token (NFT) of a clip art of a rock called 'EtherRock' was sold for 400 Ether worth $1,326,280 on Tuesday. One of the first crypto collectibles, 'EtherRock' is a JPEG of a cartoon rock that is built and sold on the Ethereum blockchain. Crypto entrepreneur Justin Sun recently announced that he paid "half-million dollars" for an EtherRock.