VaultGuard

VaultGuard is an easy-to-use app that keeps your cryptocurrency or important digital files safe and ensures they reach your loved ones - like your mom, spouse, or best friend - if something happens to you. Using a secure blockchain (Ethereum), VaultGuard locks your crypto wallet key or sensitive documents (like a will or family photos) with strong encryption. This “digital key” is split into pieces and shared with people you trust and a network of secure computers, so no one person has it all. You check in regularly through a simple app to confirm you’re okay. If you stop checking in for too long (like a month), your trusted contacts can use their pieces to unlock your digital assets or files. VaultGuard uses a safe online storage system to store your encrypted files and a decentralized network to keep everything secure and private. It’s like a digital safe deposit box that gives you peace of mind, knowing your loved ones can inherit what matters most without any hassle.

VaultGuard is built as a user-friendly hackathon MVP on the Hedera Blockchain, using AES-256 to encrypt a private key or sensitive document, with the encryption key split via Shamir’s Secret Sharing (SSS) in JavaScript and distributed to nominees and DePIN nodes. The encrypted data is stored on Walrus for decentralized persistence, with its CID logged in a Solidity smart contract (deployed via Hedera’s EVM-compatible Smart Contract Service) that tracks liveness with periodic ping() calls and triggers share submission after a missed deadline. A Go backend reconstructs the key off-chain from k=3 of n=5 shares to save gas, decrypting the data for nominees. Walrus ensures reliable storage, Hedera’s fast and cheap transactions make pings accessible for normies, and hacks like mocked DePIN nodes and pre-computed SSS math enable a responsive UI/UX blending security with mom-friendly simplicity.