Solidity Smart Contract - Joint Savings Account

Table of Contents

• Table of Contents
• Overview
  • Relevant Files
• Steps Completed
  • 1. Create a Joint Savings Account Contract in Solidity
  • 2. Compile and Deploy Contract in the JavaScript VM
  • 3. Interact with Deployed Smart Contract
• Tech Stack

Overview

I created a Solidity smart contract that accepts two user addresses, to automate the creation of joint savings accounts. These two addresses will be able to control a joint savings account.

The smart contract uses ether management functions to implement a financial institution’s requirements for providing the features of the joint savings account. These features will consist of the ability to deposit and withdraw funds from the account.

Relevant Files

See the file joint_savings.sol containing the smart contract.

The folder 'execution_results' contains images confirming the deposit and withdrawal transactions designed to test the JointSavings functionality in the Remix VM (London) worked as expected.

Steps Completed

The steps I completed are as follows:

1. Created a joint savings account contract in Solidity
2. Compiled and deployed the contract in the Remix VM (London)
3. Interacted with the deployed smart contract

1. Create a Joint Savings Account Contract in Solidity

I created the smart contract for a joint savings account in Solidity. See part of the contract in the image below:

The full contract can be found in joint_savings.sol.

2. Compile and Deploy Contract in the JavaScript VM

I compiled the smart contract as shown below:

I then deployed the contract, as shown below:

3. Interact with Deployed Smart Contract

Once the contract was deployed, I tested its functionality.

Use 'setAccounts' Function

I used the setAccounts function to define the authorized Ethereum addresses that will be able to withdraw funds from the contract:

Test Deposit Functionality

I tested the deposit functionality of the smart contract by sending the following amounts of ether. After each transaction, I used the contractBalance function to verify that the funds were added to the contract.

Transaction 1: Send 1 ether as wei.

Transaction 2: Send 10 ether as wei.

Transaction 3: Send 5 ether.

I used the website Ethereum Unit Converter to assist doing the conversions of ether to wei.

Test Withdrawal Functionality

Once I'd successfully deposited funds into the contract, I tested the contract’s withdrawal functionality.

Withdraw 5 ether into accountOne

Withdraw 10 ether into accountTwo

Use the lastToWithdraw and lastWithdrawAmount functions to verify that the address and amount were correct

Tech Stack

Tech used includes:

• Remix IDE
• Ethereum Unit Converter