Audit of ScopeLift’s Umbra-js

ScopeLift requested that Least Authority perform a security audit of umbra-js, an off-chain JavaScript library that implements the basic cryptographic scheme for interacting with the Umbra Protocol and used for building Umbra-enabled Web3 applications in Node.js or in the browser. Umbra is a protocol for enabling stealth payments on the Ethereum blockchain. It aims to enable privacy preserving transactions where the receiver’s identity is only known to the sender and receiver.

Our final audit report was completed on May 25th, 2021.

To read the full report including our findings, click here:


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