Tornado Cash
Tornado Cash is a decentralized cryptocurrency mixing service that enhances privacy by obfuscating the source and destination of transactions. It allows users to send cryptocurrency to the service, which then mixes it with other transactions, making it difficult to trace the original source. Despite its benefits for privacy, it has faced legal challenges and sanctions due to concerns about its potential use in money laundering and other illicit activities. After a significant legal battle, the US court recently lifted the sanctions, allowing Tornado Cash to resume operations.