Hi,
Today concludes my second week at the EthIndia Fellowship’23. For those of you who are new to my blogs, EthIndia fellowship is an 8-week mentorship program for developers who want to transition to web3 space organised by Devfolio. It has been an amazing learning experience this week. I wrote many smart contracts and learnt a lot about ERC20 tokens, open zeppelin contracts and randomness. For this week’s challenge we had the following
Smart contracts are kind of like "always on" vending machines that anyone can access. For this challenge, I made a decentralized, digital currency. I built an unstoppable vending machine that will buy and sell the currency. I learnt about the "approve" pattern for ERC20s and how contract to contract interactions work.
Randomness is tricky on a public deterministic blockchain. The block hash is an easy to use, but very weak form of randomness. This challenge gave me an example of a contract using block hash to create random numbers. This randomness is exploitable. Other, stronger forms of randomness include commit/reveal schemes, oracles, or VRF from Chainlink.
As a side quest, I also worked on Deadman’s switch project. I found inspiration from the following project:
Overall, this week was full of great learning and hope to learn even more exciting things in future!
Cheers.