[NFT sales on the Bitcoin chain in the past 7 days were nearly 15 million US dollars, an increase of about 28.83%] On September 15, according to CryptoSlam data, the top five blockchains in NFT sales in the past 7 days were: 1. NFT sales on the Ethereum chain were 27,482,211 US dollars, a decrease of 6.95%; 2. Sales on the Bitcoin chain were 14,808,867 US dollars, an increase of 28.83%; 3. Solana chain sales were 13,088,078 US dollars, a decrease of 2.25%; 4. BNB Chain chain sales were 7,020,978 US dollars, a decrease of 9.13%; 5. Polygon chain sales were 5,151,498 US dollars, a decrease of 43.54%.