Aptos Lottery

As part of Encode's Aptos bootcamp, the team (Aashish and Akshar) worked on the project: Aptos Lottery. This project implements a decentralized lottery system on the Aptos blockchain using the Move programming language. The smart contract allows users to participate in a lottery by buying tickets with AptosCoin, and uses on-chain randomness to select a winner.

Key Features

1. Ticket Purchase: Users can buy lottery tickets using AptosCoin.
2. Random Winner Selection and Payout: Utilizes Aptos' on-chain randomness module for fair winner selection and pays out the prize to the winner in same transaction.
3. View Functions: Provides functions to check lottery status, prize amount, and participant count.

Learnings Applied

This project demonstrates several key concepts learned from the Move bootcamp:

1. Struct and Resource Management: Using struct Lottery has key to create a resource that can only exist in one place in global storage.
2. Access Control: Implementing public entry and public(friend) functions to control who can call certain functions.
3. On-Chain Randomness: Utilizing the #[randomness] attribute and randomness::u64_range() for secure random number generation.
4. Coin Handling: Managing AptosCoin transfers using the coin module.
5. Error Handling: Defining and using custom error codes for better error management.
6. View Functions: Implementing #[view] functions for easy data retrieval without modifying state.
7. Timestamp Usage: Using timestamp::now_seconds() for time-based operations.

This project showcases the power and flexibility of Move in creating complex, secure, and efficient smart contracts on the Aptos blockchain.