Important individuals in the field of many cryptocurrencies on Twitter add ".eth" to their names to commemorate their status in the Ethereum Name Service (ENS). Ethereum co-founder V God has done this recently. However, the ENS service has some privacy issues that cannot be ignored. First, everything related to the address ".eth" is always stored on the blockchain, which means that any email or personal website that is effectively linked to ".eth" cannot be deleted. In addition, because each ".eth" account is linked to an Ethereum address, this means that the user can see the entire transaction record even if they only know someone's ".eth" account.