Synopsis :
Blockchain technology is transforming our daily lives by allowing secure and transparent record-keeping. Each block in the blockchain contains data transactions, timestamps, and hashes, making it impossible to forge data. The key feature of blockchain is its significant use of encryption as a link element between blocks. The lottery system can be integrated into blockchain, increasing transparency and ensuring fairness.
Transparency and fair distribution of funds are common issues faced by lottery players. The current system relies on intermediaries and distributors to sell lottery tickets, with the rest of the process being manually performed by intermediaries under government obedience. This system raises concerns about unpredictability, consistency, random number fairness, testability, and tamper resistance.
Blockchain technology has been equipped with a lottery buying and selling process, allowing all players to participate on an equal footing. Power is distributed to all involved, and the lottery process involves steps such as registration, purchase, completion, verification, random selection of winners, announcement of winners, and payment. The security of payment, ticketing, and payment in the sales environment is guaranteed by the blockchain system.
CRYPTOGRAPHIC RANDOM FUNCTION
The random function is used in the contract to generate and pick a random winner and hence transfer the total amount of winning ethers/Wei in his registered account.
In order to generate a winner, we are first generating a random number based on a cryptographic hash function and then picking an index from the players array as a winner. The index to be selected as a winner is calculated by performing modulus of length of players array operation on the generated random number.
Example: uint index = random() % players.length
Method of Generating Random Number
Random=(keccak256(abi.encodePacked(block.difficulty, block.timestamp, players)));
The random number is generated by encrypting the block difficulty , block timestamp and players address array using Keccak256 hash algorithm.
Key Requirements for Lottery System Smart Contract
- Struct.
- Mapping.
- Dynamic Array.
- Functions
- Modifier
- Contract