Umbra is a stealth address protocol for the EVM. Version one of Umbra has been deployed on Arbitrum since Q1 2022. In that time, over $223 Million worth of assets have flowed through Umbra on Arbitrum, enabling privacy preserving payments for tens of thousands of unique senders.

We have also created two stealth address standards: ERC5564 & ERC6538. The contracts for these standards are deployed on Arbitrum, and we are working to drive their adoption in the ecosystem, while building Umbra v2 on top of them.

The ability to send and receive payments with some measure of privacy is a critical missing piece from many public blockchains. This is felt all the more acutely on lower fee networks like Arbitrum, where uses like e-commerce payments or donations would be feasible, but a lack of privacy acts a barrier.