Masca
Masca is a MetaMask Snap (extension) that adds decentralized identity capabilities to the MetaMask wallet ecosystem. Launched in May 2023 by Blockchain Lab:UM, it enables users to manage W3C Decentralized Identifiers (DIDs), store Verifiable Credentials (VCs), and create Verifiable Presentations (VPs) directly through their MetaMask wallet.
The project implements several key technical features:
- Support for multiple DID methods including:
did:ethrdid:keydid:pkhdid:jwkdid:polygoniddid:iden3
- Integration with storage options:
- Local encrypted storage in MetaMask state
- Ceramic Network for decentralized data storage
- Support for identity protocols:
OpenID for Verifiable Credentials (OID4VC)Polygon IDwith Zero-Knowledge ProofsJSON-LDandJWTcredential formats
Notable developments include conformance certification with the European Blockchain Services Infrastructure (EBSI) and integration with Polygon ID for enhanced privacy features. The project uses the Veramo framework for handling DIDs and credentials while maintaining security by never directly accessing MetaMask private keys. Instead, it derives separate keys for DID operations using snap_getEntropy and the BIP-44 standard with coin type 1236.
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