# The fourth week @ EIF3.0

**Published by:** [Nitesh Kumar Kushwaha](https://paragraph.com/@nitesh-kumar-kushwaha/)
**Published on:** 2023-03-10
**URL:** https://paragraph.com/@nitesh-kumar-kushwaha/the-fourth-week-eif3-0

## Content

Hello, I am pleased to report that the Ethereum India Fellowship'23 has been a great success so far. The participants had a wonderful experience, particularly during the fourth week of the program, which was filled with a variety of new challenges and learning opportunities. This week proved to be one of the most interesting and engaging weeks of the fellowship thus far. Challenge #Dice game I started this week with the Challenge 3 #Dice game. In this game, I got to learn about how in blockchain we produce random numbers, this game uses a special kind of dice to generate these numbers. https://speedrunethereum.com/challenge/dice-game In this, I want to highlight the challenges of using randomness on a public deterministic blockchain. While the block hash is a commonly used method for generating randomness, it is not very secure and can be easily exploited. In this, I provide an example of a contract that uses block hash to create random numbers and explain why this method is weak. Instead, I suggest using stronger forms of randomness, such as commit/reveal schemes, oracles, or VRF from Chainlink, to ensure the security of the blockchain. https://github.com/Nitesh639/scaffold-eth-challenges/tree/challenge-3-dice-game Overall, the week was full of great learning, and hope to learn even more exciting things in the future! Nitesh Kumar Kushwaha EthIndia Fellow’

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