  Non-Fungible Tokens (NFTs) are digital assets recorded on the blockchain,
providing cryptographic proof of ownership over digital or physical items.
Although Solana has only begun to gain popularity in recent years, its NFT
market has seen substantial transaction volumes. In this paper, we conduct the
first systematic research on the characteristics of Solana NFTs from two
perspectives: longitudinal measurement and wash trading security audit. We
gathered 132,736 Solana NFT from Solscan and analyzed the sales data within
these collections. Investigating users' economic activity and NFT owner
information reveals that the top users in Solana NFT are skewed toward a higher
distribution of purchases. Subsequently, we employ the Local Outlier Factor
algorithm to conduct a wash trading audit on 2,175 popular Solana NFTs. We
discovered that 138 NFT pools are involved in wash trading, with 8 of these
NFTs having a wash trading rate exceeding 50%. Fortunately, none of these NFTs
have been entirely washed out.
