As the most popular blockchain that supports smart contracts, there are already more than 296 thousand kinds of cryptocurrencies built on Ethereum. However, not all cryptocurrencies can be controlled by users. For example, some money is permanently locked in wallets' accounts due to attacks. In this paper, we conduct the first systematic investigation on locked cryptocurrencies in Ethereum. In particular, we define three categories of accounts with locked cryptocurrencies and develop a novel tool named CLUE to discover them. Results show that there are more than 216 million dollars value of cryptocurrencies locked in Ethereum. We also analyze the reasons (i.e., attacks/behaviors) why cryptocurrencies are locked. Because the locked cryptocurrencies can never be controlled by users, avoid interacting with the accounts discovered by CLUE and repeating the same mistakes again can help users to save money.
翻译：作为最受欢迎的支持智能合同的链条,已经存在超过296 000种在Ethereum上建立的加密。 但是,并非所有的加密都可以由用户控制。 例如,一些钱由于袭击而被永久锁在钱包账户中。 在本文中,我们对Etheem的锁定加密进行首次系统调查。 特别是, 我们用锁定的加密来定义三类账户, 并开发一个名为 CLUE 的新工具来发现它们。 结果显示, Ethereum 锁定的加密价值超过2.16亿美元。 我们还分析了为什么加密被锁起来的原因( 即攻击/ 行为 ) 。 因为锁定的加密无法被用户控制, 避免与 CLUE 发现的账户发生互动, 并重复同样的错误可以帮助用户节省资金 。
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