Tonnel is the first Zero-Knowledge powered project built on the TON blockchain that aims to provide privacy features similar to those offered by Tornado Cash on the Ethereum blockchain. Like Tornado Cash, Tonnel allows users to perform "coin mixing" or "coin shuffling" transactions, in which multiple users can pool their funds together in a single transaction and then withdraw them in a way that makes it difficult to determine which funds belong to which user. This helps to protect the privacy of the users by making it more difficult to track their transactions on the blockchain. Tonnel is also open source, like Tornado cash, allowing users to transact anonymously.