The NFT market has seen explosive growth in 2021, with the NFT market trading at $754 million in Q2 2021, up 53% year-on-year, according to Nonfungible. Popular NFT projects are coming out one after another, and according to Cryptoslam, the three NFT projects with the highest sales are blockchain game Axie Infinity, NBA player card collectible NBA Top Shot and avatar collectible Cryptopunk, with sales of US$1.04/$670/$650 million respectively. In addition, the second quarter of 2021 showed growth in NFT secondary market transactions, reflecting the evolving and maturing NFT market.