CryptoBank
CryptoBank is a Solidity smart contract that acts as an on-chain Ether bank. Users can deposit ETH, withdraw their balance, and send ETH directly to other addresses — all guarded against reentrancy attacks. The contract owner can adjust the maximum deposit limit at any time.
Built using Foundry as part of a Solidity security and smart contract development workflow.
Architecture
Functions
| Function | Access | Description |
|---|---|---|
depositEther() | Public | Deposit ETH into the bank; updates Balances[msg.sender] |
withdrawEther(amount) | Public | Withdraw ETH to caller; protected with nonReentrant |
sendEth(amount, to) | Public | Transfer ETH to another address; protected with nonReentrant |
modifyMaxLimit(n) | Owner | Update the depositLimit state variable |
State Variables & Events
| Name | Type | Description |
|---|---|---|
Balances | mapping(address => uint) | Tracks each user’s ETH balance |
depositLimit | uint | Maximum ETH a user can deposit |
| Event | Emitted When |
|---|---|
EtherDeposited | Successful deposit |
EtherWithdrawn | Successful withdrawal |
EtherSent | Successful peer-to-peer transfer |
MaxBalanceEdited | Owner changes the deposit limit |
Security
withdrawEtherandsendEthuse anonReentrantmodifier to prevent reentrancy attacks.- Balance checks are performed before any ETH transfer.
- Owner-only access control is applied to administrative functions.