🛡️ Reclaim – Preserve Your Legacy on Starknet

This repository contains the Reclaim project, developed for the Re{ignite} Starknet Hackathon.

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🌱 What is Reclaim?

**Reclaim** is a decentralized memory vault built on Starknet. It allows users to store their most meaningful memories—photos, audio, text—**encrypted and permanently accessible**, while preserving **privacy, ownership and controlled access** over time.

Reclaim is not just a memory app. It’s a protocol that:

• Ensures encrypted data is accessible only under strict conditions (e.g. after a date or through heir consensus).
• Respects the sovereignty of the user: they hold their keys, and access never depends on a centralized service.
• Demonstrates the foundation of decentralized key management on-chain, paving the way for future integrations like LitProtocol.

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🧩 The Problem

Web3 lacks reliable, decentralized mechanisms to:

• Permanently store private data.
• Enable conditional access to encrypted content.
• Allow users to pass down digital assets or secrets without trusting third parties.

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🧪 Our Solution

Reclaim defines a dual-access protocol allowing:

1. Time-lock unlocks: Memories can be revealed after a specific date, validated by the smart contract.
2. Heir consensus unlocks using Shamir Secret Sharing (SSS):
   • The encryption key is split into 3 parts:
     • One held by the user
     • One held by the smart contract (encrypted)
     • One distributed across designated heirs, requiring consensus to reconstruct
   • Access is granted when at least 2 out of 3 shares are recovered.

All encryption and decryption happens client-side, ensuring total data privacy.

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🏗️ Architecture

reclaim ├── contract/ # Starknet Cairo 1.0 smart contract ├─── Cairo smart contract ├── frontend/ ├── backend/

• Files are encrypted in-browser using AES-256.
• Encrypted content is pinned to IPFS.
• Metadata and access control rules are stored in the Starknet smart contract.

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🧠 Technologies Used

• ⚡ Starknet (Cairo 1.0)
• ⚡ Starknet.dart
• 🔐 AES-256 symmetric encryption
• 🧩 Shamir Secret Sharing (SSS)
• 🌐 IPFS
• 📱 Flutter (Dart) – cross-platform frontend (mobile + web)
• 🧠 Future-ready: LitProtocol & ZK-compatible design

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🚀 MVP Features

• Register with Google → invisible wallet creation
• Upload encrypted memories (image, text)
• Choose access method:
  • Unlock after specific date
  • Unlock by heir consensus
• View stored memories once access is granted

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🔮 Future Vision This MVP demonstrates that:

Fully decentralized access control is possible without central custodians

The protocol can scale by integrating:

⏳ Smart contract unlock conditions (time, wallet, NFT ownership, etc.)

🔐 Secret storage via LitProtocol or other threshold-based MPCs

🧠 zk-Proofs for verifiable conditions without revealing data

👪 Social recovery and heir designation UI

🤝 Contributors Built with care by:

• Jean Pool Cruz @jpool09 — App design + Flutter development
• Mateo Atilio Mancinelli @teoeme — Smart Contract + protocol design
• Rinato @rinatodev — Invisible wallet creation + starknet.dart implementation

🧠 Learn More

about the protocol: docs/protocol.md

LitProtocol & SSS – our approach lays groundwork for their integration

Shamir Secret Sharing (Wikipedia)

Cairo 1.0 – the Starknet programming language

“Memories are meant to last. Reclaim ensures they do — even after we're gone.”