End-to-End Example

In this section, we'll explore how to use fhenix.js to send transactions on the Fhenix blockchain.

To send transactions with fhenix.js, we'll first establish a connection to the blockchain, then interact with it using a contract method. For this process, we'll also need to encrypt the transaction data.

Here's a step-by-step explanation, using ethers, though other libraries like web3can also be used in a similar way.

Let's assume we have a deployed ERC20 contract, only this one uses encrypted inputs and outputs (you can find the solidity code here. Let's see how we can transfer some of our tokens to another address, while keeping the amount hidden.

1. Import fhenixjs and ethers

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OUTDATED

import { FhenixClient } from "fhenixjs";
import { BrowserProvider } from "ethers";

2. Define the Smart Contract Address and Provider: The smart contract address is the Ethereum address of the deployed contract. provider allows you to interact with the Ethereum blockchain.

const CONTRACT_ADDRESS = "0x1c786b8ca49D932AFaDCEc00827352B503edf16c";
const provider = new BrowserProvider(window.ethereum);

3. Create a Client to Interact With Fhenix: The constructor of FhenixClient is used to create an instance of the client with the given provider.

const client = new FhenixClient({ provider });

4. Create the Transfer Function: The transfer function is used to send a transaction on the blockchain. It requires the recipient address and the amount to be sent as parameters.

const transfer = async (to, amount) => {
  // Create client
  const client = new FhenixClient({ provider });

  // get contract
  const contract = await ethers.getContractAt(CONTRACT_NAME, CONTRACT_ADDRESS);
  const encryptedAmount = await client.encrypt(number, EncryptionTypes.uint32);

  const response = await contract
    .connect(SENDER_ACCOUNT)
    .transfer(address, encryptedAmount);
  return response;
};