In the previous chapter, you saw how to use web3.js to interact with your deployed Smart Contract. Using web3.js, you were able to connect to an Ethereum node (through MetaMask, or directly to an Ethereum node such as Ganache running locally on your computer). Using the document notarizer example, you were able to
Send a string to the Smart Contract through the web front end for storing its hash on the blockchain
Send Ethers to the Smart Contract to pay for the notarization service
Verify if a string’s hash has been previously stored on the blockchain
However, there are ...
