Silent Shard Snap is a MetaMask browser extension (Snap) that enables Multi-Party Computation (MPC)-based two-factor authentication (2FA) for MetaMask wallets. It transforms a standard MetaMask wallet into a Distributed Self-Custodial Wallet by splitting cryptographic key operations across multiple parties using MPC technology. The extension works in conjunction with a companion mobile phone app, requiring both the browser and a paired phone to approve transactions. This setup ensures that no single device holds a complete private key, reducing the risk of key compromise. Key characteristics: - Built on Silence Laboratories' proprietary MPC protocol called "Silent Shard" - Operates as a MetaMask Snap (an extension within the MetaMask browser extension ecosystem) - Uses ECDSA-based MPC cryptography, which has been independently audited by Cure53 - Transaction approvals require both browser and phone confirmation - Does not store private keys or private user data on external servers - Chain-agnostic — not limited to any specific blockchain network - Targeted at individual MetaMask users seeking enhanced self-custodial wallet security The product has been security-audited (Cure53 audit report available) and is free to install via the MetaMask Snaps platform.