Nicolas BERNARD

Imagine a website that sell articles and wants to allow its clients to pay with ETH providing one account to each of them. The Master smart-contract can create new child accounts so the clients send ETH to them. Then the Master contract withdraw the funds of the children and can transfer it to its owner. Having one account for each client makes it easier to manage the incoming payments. Each payment is received on a different account that can be linked to a client.

Below, some details about how the smart-contracts works.

• In order to generate one address per client, we use a Master smart-contract that deploy a child smart-contract on the ChildFactory.sol model.
• The Master smart-contract is the owner of every child contract and is the only one that can execute the withdrawal function of the child.
• The child contracts also have an event that is send every time the contract receive or transfer some ETH so the webpage can automatically update the amount of the different accounts.
• The fallback function allows the contract to receive some ETH directly, sending a transaction to its address.

• Step1 - ​ First you need to install Truffle (version > 5.0.0, [email protected] at this time) npm install -g truffle

• Step2 - Install the node modules running npm install

With Ganache:

• Step3 - ​ Install and run ganache-cli --mnemonic xxxx (specify your Metamask mnemonic).

• Step4 - ​ Migrate the contracts on your Ganache network running truffle migrate --network ganache

With Ropsten:

• Step3 - ​ Specify your Metamask mnemonic in truffle.js file.

• Step4 - ​ Migrate the contracts on Ropsten network running truffle migrate --network ropsten

Run the server:

• Step5 - ​ Run npm run dev and go to localhost:8080

• Step6 - Configure your Metamask wallet on the right network: localhost:8545 (Ganache) or Ropsten.

• Step7 - You can also run the contracts tests: truffle test