CoinJoin mixes transaction inputs and outputs to obscure links between senders and receivers, enhancing Bitcoin’s fungibility and transaction privacy.

Confidential Layer is a proposed cross-chain bridge using ring signatures and stealth addresses to enable private Bitcoin transactions across blockchains.

Dandelion++ obfuscates Bitcoin transaction broadcast origins, preventing IP-to-address linking at the network level to enhance user privacy.

Lightning Network uses onion routing to hide off-chain payment details, enhancing transaction privacy for Bitcoin users.

Taproot, activated in 2021, enables script hiding and signature aggregation, making complex Bitcoin transactions indistinguishable and enhancing privacy.

ZeroSync uses zero-knowledge proofs to compress blockchain data, reducing metadata exposure and improving privacy for Bitcoin node synchronization.