Smart Contracts in 2025: Solidity, Auditing, and Upgrade Patterns
By Dr. Sarah ChenAugust 12, 20251 min read0 commentsBlockchain & Web3
# Smart Contracts in 2025: Solidity, Auditing, and Upgrade Patterns
> Practical blockchain and web3 guidance for modern developers.
## Overview
Blockchain and Web3 are transforming finance, gaming, and digital identity.
## Key Concepts
- Decentralization and trustless systems
- Smart contract security
- Token standards (ERC-20, ERC-721, ERC-1155)
- On-chain vs. off-chain data
## Example
```solidity
// Minimal ERC-20 token
contract Token {
mapping(address => uint) public balanceOf;
function transfer(address to, uint amount) public {
require(balanceOf[msg.sender] >= amount, 'Insufficient');
balanceOf[msg.sender] -= amount;
balanceOf[to] += amount;
}
}
```
## Resources
- Related: blockchain
- Related: smart-contracts
- Related: solidity
- Related: auditing
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