Tumbler is a service or a protocol which anonymizes the sender and receiver of money or crypto essentially making it impossible to trace transactions.
Though the crypto space may be anonymous to a certain level, people crave a more significant state of privacy. Blockchain is transparent, allowing people to check the records of transactions linked to an address. People can know the amount tokens in an address, as well as how much has been sent or received. Information concerning the addresses of the recipients or senders can also be accessed.
Crypto tumbler injects more privacy into the operations of crypto users. It is a service that mixes the transaction from a user with others to remove the chance of anyone finding out the source of the crypto.
When a such a service is used, and transactions are done, people can't say for sure the sender of an amount of cryptocurrencies.
Crypto users that want to remain anonymous can send their cryptocurrencies to a tumbler service, a crypto blending ecosystem, or a crypto mixing platform.
They act as a VPN or a Virtual Private Network, hiding the sender from the receiver and other people in a network.
Crypto tumbler platforms tend to mix the tokens with others, and sometimes, they split up the coins to add an extra layer of anonymity to the transaction. To use this service, the sender must pay a fee.
The crypto mixing protocol usually takes their fee from the coins sent by the sender and transfers the remaining to the recipient's address.
Peer-to-peer tumblers also exist, and they link crypto users together. In this case, centralized authority is not used. The different users come together to mix the tokens.
Different governments have reservations concerning crypto mixing services, as they believe it makes it easier to launder cryptocurrencies.
While opting for this service, it is essential to check if it is legal in your region and the level of reputation that a crypto mixing service has.