Recently, we've observed a rampant increase in eth_sign blind signing scams. Many individuals have been baited into signing seemingly safe eth_sign signatures on dubious websites, resulting in loss of funds. To ensure a better understanding of how this scam works, it is essential first to explain the true nature of eth_sign signatures.
In the Ethereum ecosystem, eth_sign is a common signature method. It allows users to sign a message using their private keys - a cornerstone of blockchain transactions, as it attests to a specific account initiating a transaction. Simply put, it’s like signing a document, therefore agreeing to or supporting its contents.
However, the commonly overlooked issue with eth_sign is its notorious byname - 'blind signing.' This term stems from the fact that when signing a message with eth_sign, you may not fully comprehend what you're endorsing, nor can you retrospectively verify the signature's actual content. The eth_sign inputs are in a raw character format, not easily readable by humans. It's akin to signing a contract written in indecipherable language, hence the term 'blind signing.'
Upon understanding the concepts of eth_sign signatures and blind signing, we can delve into eth_sign's potential risks and how to prevent them. Since eth_sign signatures are used to endorse all types of messages, including transactions and smart contract instructions, a malicious third party can trick you into signing a message you don't fully understand, transferring your funds to their account. Even worse, they might present an apparently harmless message for you to sign. In reality, this message could be a transfer order, and signing it would result in asset loss.
imToken's latest version has upgraded its risk control system to combat such fraudulent activities. When users invoke eth_sign to sign messages on third-party DApps, imToken sends a risk warning pop-up, advising them of the potential transaction risks. Besides, the wallet initiates a 15-second cooldown timer to grant users ample time to assess the necessity and safety of the signing operation.
The imToken security team has your back – read their expert advice to protect your digital assets:
- Remain vigilant about all requests demanding eth_sign signatures, particularly those from unknown or untrustworthy origins. If there's any suspicion about the authenticity or intent of the request, please refrain from signing it hastily.
- Ensure the messages or transaction requests you sign originate from reliable sources, such as official websites, social media, or verified communication channels. Never trust unverified links, emails, or private messages.
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