Umbra

Umbra is a stealth address protocol for Ethereum. That means it allows a payer to send funds to a fresh address. That address is controlled by the intended receiver, but only the payer and the receiver know that.

One way to think of Umbra is this: Imagine if, before anyone sent you funds, you sent them a brand new, never before used address. Only the sender would know you control that address, which adds a layer of privacy to your payment. Payments via Umbra work similarly, but are non-interactive—you don’t need to give someone a fresh address, they can just generate one they know only you will be able to access.