Solfit

Blockchain-Powered Fitness Accountability Platform

Solfit is a blockchain-powered fitness challenge platform that allows users to participate in step-based fitness challenges, ensuring transparency, fairness, and security using Solana smart contracts where rewards are distributed on-chain, making the process trustless and tamper-proof.

Solfit Flow Diagram

🚀 Features

🔒 Secure & Transparent

• All fitness data is validated cryptographically before syncing with the blockchain
• No centralized authority—everything is stored and verified on Solana

🎯 Fitness Challenges

• Create custom step-count challenges with entry fees and rewards
• Participants must meet daily step goals to win their share of the prize pool
• Failed participants' stakes get distributed among successful ones
• Social Challenges & Private Groups: Users can create or join private groups to compete with friends or a community. Custom challenge settings allow exclusive, invitation-based participation.

🔄 Seamless Health Data Syncing

• Uses Google Fit API (or Health Connect for Android users) for step tracking
• Signed data ensures no cheating or spoofing

💰 Reward Distribution

• Rewards are automatically distributed via smart contracts
• Participants who complete challenges get their stake + extra rewards from failed participants

📜 Solana-Powered Smart Contracts

• Smart contracts ensure tamper-proof challenge management
• Funds are held securely in on-chain escrow accounts

📱 Mobile App

• Built using React Native for a smooth, cross-platform experience
• Users can join challenges, track progress, and withdraw rewards easily

🛠 Tech Stack

Mobile App (React Native)

Mobile app (Android) can be downloaded from the releases section!

• Built using React Native for cross-platform support
• Sign In With Solana
• Health Connect Integration for retrieving step data

Backend & Smart Contract (Rust, Anchor)

• Solana smart contracts for challenge management

• Health data validation using cryptographic signing

Blockchain Integration

• Uses Solana blockchain to ensure transparent, immutable challenge tracking
• Smart contracts handle challenge creation, participation, syncing, and rewards

📖 How It Works

1. Create Challenge: Users create a challenge by setting a step goal, duration, and entry fee amount
2. Join Challenge: Participants join by paying the entry fee. Users can join public challenges open to everyone or private group challenges that require an invite code or admin approval.
   • Private Groups: Users can create exclusive fitness communities and invite friends or specific users.
3. Sync Data: Participants sync their step data daily using Health Connect API (Backend Verification)
4. Track Progress: The blockchain records progress, ensuring no cheating
5. Withdraw Reward: At the end of the challenge, users who completed the goal win rewards, while failed participants lose their stakes

🔗 Getting Started

1. Install Dependencies

yarn install

2. Run the React Native App

yarn android

2. Run the Backend (for Steps Verification)

pnpx wrangler@latest dev

3. Deploy Smart Contracts (Rust + Anchor)

anchor build && anchor deploy

📢 Future Enhancements

• Fitbit API Integration 📡 to support more fitness tracking devices