Ethereum extends blockchain technology beyond simple currency transfer — a programmable platform where code itself runs directly on the blockchain.
The Mechanics
A smart contract is self-executing code residing at a specific blockchain address — it automatically enforces the terms written into it without requiring a central authority, and once deployed, it generally cannot be deleted and its interactions are irreversible. This programmability underlies decentralized applications spanning lending, trading, and digital ownership. On September 15, 2022, Ethereum completed "the Merge," transitioning from proof-of-work to proof-of-stake — a verified shift that reduced the network's energy consumption by approximately 99.95%.
One thing worth checking: Because smart contract code is generally immutable and irreversible once deployed, a bug or vulnerability in the code becomes a permanent risk — several documented smart contract exploits have resulted in irreversible fund losses, making independent code audits a meaningful signal before trusting a specific contract with funds.
Someone Considering Interacting With a New Smart Contract: Check for a independent security audit before trusting it with funds.
Someone Confused About Ethereum's Energy Use: The 2022 Merge to proof-of-stake cut energy consumption by ~99.95% — a documented, permanent change.
Understand Ethereum the Way
- Understand smart contracts as generally irreversible code once deployed.
- Check for independent audits before trusting a new contract.
- Know the 2022 Merge shifted Ethereum to proof-of-stake permanently.
See proof-of-work vs. proof-of-stake and what is DeFi for applications built on this platform.
