Ethereum’s Building Blocks: From 2015 to Today

Ethereum is a blockchain platform launched in 2015 by Russian-Canadian developer Vitalik Buterin, created to go beyond Bitcoin’s focus on person-to-person payments. Its native token, ether (ETH), is used to move value between addresses and to pay for activity on the network. The platform is widely described as the second-largest cryptocurrency after Bitcoin.

Buterin’s core idea was to make the blockchain programmable. Alongside value transfers, Ethereum supports smart contracts — computer programs that run automatically when predefined conditions are met. The example often cited: a delayed train could trigger an automatic refund to a passenger’s wallet, with no claims process and no trusted intermediary, because the blockchain itself enforces the agreement.

The system is built on the Ethereum Virtual Machine (EVM), the underlying component that interprets and compiles smart-contract code. This opened the door for thousands of developers to build decentralized applications (dapps) in areas such as finance, video games, real estate, logistics and cloud services. Tokens issued on the network must follow the ERC-20 standard, which has become a common blueprint for Ethereum-based assets.

In practice, ETH serves both as a digital currency and as the fuel for transactions on Ethereum. The network has been updated continuously to improve user experience, scalability and security — meaning the technology described in the original explainer has kept evolving since its launch.

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What Ethereum’s Programmable Blockchain Actually Changes

Ethereum’s Founding Bet: Programmability Over Payments

Ethereum’s place in crypto was defined by a simple split from Bitcoin. Where Bitcoin was designed as a peer-to-peer payment system, Ethereum treated the blockchain as a general-purpose computing layer. That is the strategic insight behind the project: value transfer is only one use case, while contracts, tokens and applications can all live on the same network.

Smart Contracts and the ERC-20 Standard

The practical consequence of smart contracts is automation without intermediaries. The train-refund example illustrates the model: code, not customer service, decides when a condition has been met. The ERC-20 standard added a common technical language for tokens, which helped developers issue assets on Ethereum without designing each token from scratch. This is one reason Ethereum became the default home of the token economy.

One Stale Detail Worth Correcting

The source text says ether is “mined” under a proof-of-work consensus algorithm. That description is outdated: Ethereum switched to proof of stake in the 2022 Merge, ending mining on the main network. Readers relying on the explainer should treat the consensus mechanism as a changed detail, even though the general description of smart contracts and dapps remains broadly accurate.