Many blockchain networks use public databases. So, anyone having an internet connection can view the list of the network’s transaction history. They can see all the details associated with the transaction and your wallet details, but the name of the user will still be unknown to them. Instead, they will come across as a public key – the unique code representing the user on the blockchain network.
First recorded Mixer
Protocols / Chains to access Privacy:
What are Zero-Knowledge Proofs?
Other Forms of privacy-preserving technology