Blockchain technology, while revolutionary, poses significant privacy challenges. Every transaction, including sender and receiver addresses, is publicly accessible on the blockchain, making it difficult to maintain privacy. This is where stealth addresses come into play, offering a solution to enhance transaction privacy.

Stealth addresses are unique, one-time wallet addresses generated for each transaction, preventing the linking of multiple payments to a single recipient. To understand how stealth addresses work, consider the example of Alice sending funds to Bob. Bob generates two separate private keys: a viewing key, which allows him to identify payments, and a spending key, used to control and spend the funds once received.

These keys are combined into a stealth meta address, which Bob shares with Alice. Alice then generates an ephemeral key pair, mixes it with Bob's viewing public key to create a shared secret, and uses this to generate a stealth address. After transferring funds to this address, Alice publishes an announcement on the blockchain, which Bob can use to detect and claim his funds.

This process ensures that transactions remain private and unlinkable, even though they are publicly visible on the blockchain. While stealth addresses do not hide transaction amounts, they significantly complicate the process of linking transactions to specific users. This technology is a step forward in addressing the privacy concerns inherent in public blockchain networks.