Blockchain privacy is a crucial aspect of blockchain technology that ensures users' anonymity and confidentiality while transacting on the network. Standard blockchains, such as Bitcoin and Ethereum, typically offer pseudonymous transactions, meaning that while the transaction history is public, the identity of the users involved is obscured. However, this does not guarantee full privacy, as advanced analysis can sometimes reveal user identities. To enhance privacy, various techniques and technologies have been developed, including zero-knowledge proofs, privacy coins like Monero and Zcash, and layer-2 solutions.