English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We investigate in this work a recently emerged type of scam ERC-20 tokencalled Trapdoor, which has cost investors billions of US dollars on Uniswap,the largest decentralised exchange on Ethereum, from 2020 to 2023. In essence,Trapdoor tokens allow users to buy but preventing them from selling byembedding logical bugs and/or owner-only features in their smart contracts. Bymanually inspecting a number of Trapdoor samples, we established the firstsystematic classification of Trapdoor tokens and a comprehensive list oftechniques that scammers used to embed and conceal malicious codes, accompaniedby a detailed analysis of representative scam contracts. In particular, wedeveloped TrapdoorAnalyser, a fine-grained detection tool that generates andcrosschecks the error-log of a buy-and-sell test and the list of embeddedTrapdoor indicators from a contract-semantic check to reliably identify aTrapdoor token. TrapdoorAnalyser not only outperforms the state-of-the-artcommercial tool GoPlus in accuracy, but also provides traces of malicious codewith a full explanation, which most of the existing tools lack. UsingTrapdoorAnalyser, we constructed the very first dataset of about 30,000Trapdoor and non-Trapdoor tokens on UniswapV2, which allows us to train severalmachine learning algorithms that can detect with very high accuracy evenTrapdoor tokens with no available Solidity source codes.

From Programming Bugs to Multimillion-Dollar Scams: An Analysis of Trapdoor Tokens on Uniswap