The problem TwitterOnBlock solves

Made Twitter on an Ethereum network backend, where you can tweet like usual, but laso set profile pictures and they'll automatically get minted as NFTs, ERC-721 token standard, hence, they'll be visible on NFT marketplaces like OpenSea, transactions shall be recordedon Etherscan.

Uses web3 user authentication systems like Metamask. All you need is a chrome browser extension of your Metamask wallet.