In 1995, only 16 million people were online — roughly 0.2% of today's global population. The internet was dismissed as a fleeting trend. Less than a decade later, Web 1.0 gave way to Web 2.0, with Facebook, Google, and Gmail connecting users in real time. Now, most of us can't go an hour without sending a text, checking email, or searching something online. Ethereum is widely seen as the next catalyst, pushing the internet from Web 2.0 into Web 3.0.
What Is Ethereum and How Is It Different from Bitcoin?
Ethereum is a decentralized, blockchain-based software platform powered by its native token, Ether. Like Bitcoin, it enables peer-to-peer transfers; but Ethereum goes much further. Developers use the Solidity programming language to build custom applications, decentralized finance (DeFi) platforms, and decentralized exchanges on top of its base layer. Bitcoin, as a first-generation blockchain, has rigid code that cannot be easily changed, aiming to replace fiat currency. Ethereum, in contrast, is flexible, programmable, and upgradeable — designed to serve as an operating system for decentralized applications. Bitcoin has a capped supply of 21 million coins; Ethereum has no hard cap but introduced a burning mechanism on August 5, 2021, to limit annual Ether creation.
The DAO Hack and the Split into Ethereum Classic
Vitalik Buterin published the Ethereum whitepaper in 2013, and the mainnet launched on July 30, 2015, with an initial supply of 72 million Ether. 80% was sold in a crowdsale in July–August 2014; the remaining 12 million went to early contributors and the Ethereum Foundation. In 2016, the Decentralized Autonomous Organization (DAO) hack exposed a major vulnerability, draining over $50 million worth of Ether. The community largely voted to reverse the theft and invalidate the hack-related blocks. A minority chose to keep the original chain, resulting in a hard fork that created Ethereum Classic (ETC). This split remains a defining moment for Ethereum's history.
Smart Contracts: From Vending Machines to On-Chain Programs
Smart contracts are the building blocks of Ethereum. The concept dates back to the 1990s, proposed by computer scientist and lawyer Nick Szabo, who compared them to a vending machine: insert a dollar, pick a soda, receive the drink and change — outcomes are predetermined and irreversible. Once deployed on Ethereum, a smart contract executes automatically according to its code, cannot be deleted unless specified in the code, and is tamper-proof. Deploying a smart contract incurs fees: a simple contract costs roughly $500, while a complex one can exceed $10,000. As of June 2021, developers had deployed about 2.5 million contracts on Ethereum, processing thousands of transactions per second.
Mining and the State Machine
Ethereum currently runs on Proof-of-Work (PoW), where miners compete to solve blocks and earn block rewards while securing the network. But Ethereum doesn't just record transactions — it also records the network's state, including all running applications, user balances, smart contract code, and changes made. This is why Ethereum is often called a state machine. Since December 2020, Ethereum has been transitioning to the Consensus Layer (formerly Ethereum 2.0), aiming for a Proof-of-Stake (PoS) mechanism to improve scalability, security, and sustainability. Every node must execute each transaction and store the output, ensuring the ledger remains consistent and immutable.