Much of the recent excitement around decentralized finance (DeFi) comes from
hopes that DeFi can be a secure, private, less centralized alternative to
traditional finance systems but the accuracy of these hopes has to date been
understudied; people moving to DeFi sites to improve their privacy and security
may actually end up with less of both.

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In this work, we improve the state of DeFi by conducting the first
measurement of the privacy and security properties of popular DeFi
applications. We find that DeFi applications suffer from the same kinds of
privacy and security risks that frequent other parts of the Web. For example,
we find that one common tracker has the ability to record Ethereum addresses on
over 56% of websites analyzed. Further, we find that many trackers on DeFi
sites can trivially link a user’s Ethereum address with PII (e.g., name or
demographic information) or phish users.

This work also proposes remedies to the vulnerabilities we identify, in the
form of improvements to the most common cryptocurrency wallet. Our wallet
modification replaces the user’s real Ethereum address with site-specific
addresses, making it harder for DeFi sites and third parties to (i) learn the
user’s real address and (ii) track them across sites.

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