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.

翻译：非同质化代币（NFT）是记录在区块链上的数字资产，可为数字或实物资产提供加密所有权证明。尽管Solana近年才逐渐获得市场关注，但其NFT市场已产生可观交易量。本文首次从纵向测量与洗盘交易安全审计两个维度，对Solana NFT特征开展系统性研究。我们从Solscan平台采集了132,736个Solana NFT，并分析这些藏品集合内的销售数据。通过考察用户经济活动与NFT持有者信息发现，Solana NFT头部用户呈现明显的购买分布偏态。随后，我们采用局部异常因子算法对2,175个热门Solana NFT进行洗盘交易审计，发现138个NFT池存在洗盘交易行为，其中8个NFT的洗盘交易率超过50%。值得庆幸的是，这些NFT均未出现完全清洗现象。