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Blockchain/Solidity Engineer - Coggle Diagram

- - - - gas optimizations
        
        struct packing
        
        https://medium.com/@novablitz/storing-structs-is-costing-you-gas-774da988895e
        
        override tokenURI (cheap) VS _setTokenURI (expensive) for storing token data on-chain
      - testing & deployment
        
        suites/libraries
        
        Solidity
        
        Truffle
        
        Foundry
        
        dapptools
        
        Ganache
        
        Python
        
        Brownie
        
        JavaScript
        
        Waffle
        
        Hardhat
        
        Chai
        
        Truffle
        
        types of tests
        
        integration
        
        unit
        
        invariant
        
        constants and equality
        
        symbolic
        
        moderate complexity limited, more equations
        
        fuzzing
        
        no complexity limit, unlimited runs
      - infamous hacks/exploits
        
        Randomness on-chain (you can't)
        
        Chainlink VRF
        
        integer overflow/underflow
        
        denial of service
        
        re-entrancy i.e. The DAO hack
        
        spells e.g. Adidas Originals mint 330 NFT when max_tx per user is 2
        
        flash loans
      - tutorials
        
        consensys blockchain course
        
        capture the ether
        
        ethernaut - security
        
        cryptozombies - basics
        
        https://www.damnvulnerabledefi.xyz/
- - - - buy, sell, bid functionality
      - how to index detect tokens for specific user address?
        
        naive - moralis
        
        filter transfer/mint events via etherscan API
        
        subgraphs
      - support both ERC721 and ERC1155 tokens
    - - whitelisting
        
        merkle proofs
        
        tree implementation
        
        full guide
        
        mapping(address => uint256) <- expensive
      - commit-reveal mechanism
    - - allow users who bought NFTs to access
      - voting power
    - - staking
      - interest
      - burning
  - - - TypeScript/JavaScript
      - HTML + CSS
      - ReactJS / VueJS
    - - web3.js
      - ethers.js
      - Moralis