Project Overview

A Decentralized Task Management System where users can:

• Create and manage personal task lists
• Assign tasks to other users
• Reward task completion with tokens
• Track task history and statistics

This project demonstrates Solana core concepts: accounts, PDAs, CPIs, rent-exemption, transactions, and token handling.

---

Architecture Overview

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   User Wallet   │────│  Task Manager    │────│  Reward Token   │
│   (Account)     │    │    Program       │    │    Program      │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                                │
                       ┌────────┴────────┐
                       │                 │
                  ┌────▼────┐      ┌────▼────┐
                  │  Task   │      │ User    │
                  │ Account │      │Profile  │
                  │  (PDA)  │      │ (PDA)   │
                  └─────────┘      └─────────┘

---

Core Concepts Implementation

1. Solana Account Model

   • User Profile Account: Stores user stats, completed tasks count
   • Task Account: title, description, status, assignee
   • Token Account: SPL token accounts for rewards
   • Program Account: Smart contract (Anchor recommended)

2. Program Derived Address (PDA)

   • User profile PDA: Pubkey::find_program_address(&[b"user_profile", user_pubkey.as_ref()], program_id)
   • Task PDA: Pubkey::find_program_address(&[b"task", user_pubkey.as_ref(), &task_id.to_le_bytes()], program_id)
   • Global stats: [b"global_stats"]

3. Transactions & Instructions

   • initialize_user
   • create_task
   • assign_task
   • complete_task
   • claim_reward

4. Cross Program Invocation (CPI)

   • Use SPL Token program to mint or transfer reward tokens
   • Use System program to create rent-exempt accounts

5. Transaction Fees

   • Demonstrate rent-exemption and getMinimumBalanceForRentExemption
   • Show fee estimation and examples

---

Stack

• Program: Anchor (Rust)
• Client: TypeScript with @project-serum/anchor and @solana/web3.js
• Token: @solana/spl-token for client-side token interactions

---