Chapter 5: Ethereum and Smart Contracts—Dawn of the World Computer

Introduction

Bitcoin proved to the world the feasibility of decentralized digital currency, like a calculator that could only do addition and subtraction with single functionality. However, a group of young developers began thinking about a grander question: Could we extend this decentralized thinking from "currency" to "computation" itself? Could we create a globally shared, never-crashing "world computer" that anyone could freely program on? The answer to this question is Ethereum. Its birth opened the blockchain 2.0 era, bringing this technology from single financial applications into a realm of infinite possibilities where everything can be programmed.

5.1 "Vitalik's" Genius Vision

The protagonist of this story is Vitalik Buterin, a Russian-Canadian programmer and writer, affectionately called "V-God" by the community. As an early deep participant in Bitcoin and co-founder of Bitcoin Magazine, Vitalik had a profound understanding of Bitcoin's limitations. He believed Bitcoin's scripting language was too limited to support more complex applications. He once proposed to the Bitcoin core community that they expand Bitcoin's functionality, but was rejected.

Personal Story: Vitalik Buterin

Vitalik is a true prodigy. At age 19, he single-handedly wrote the Ethereum whitepaper based on his deep insights into blockchain. Unlike Satoshi's mystery and depth, Vitalik has always been active on the community frontline, with his characteristic lanky frame, slightly shy smile, and amazing technical intuition, becoming Ethereum's undisputed spiritual leader. He's not like a company CEO, but more like a chief scientist at an open research institution, constantly injecting new vitality into Ethereum's technical roadmap and philosophical thinking.

In late 2013, during a trip to Israel, Vitalik systematically organized his thoughts into a document, publishing the whitepaper "Ethereum: A Next-Generation Smart Contract and Decentralized Application Platform." In this whitepaper, he proposed a revolutionary concept: rather than developing an independent blockchain for each decentralized application, why not create a universal, Turing-complete blockchain platform? On this platform, anyone could create and deploy their own decentralized applications (DApps) just like publishing apps on an App Store.

5.2 Smart Contracts: Code as Law

Ethereum's core weapon for realizing this vision is "smart contracts."

The concept of "smart contracts" was first proposed by cryptographer Nick Szabo in 1994. His vision was simple: write real-world contract terms in code form. Once this code is deployed on blockchain, it would work like an automatic vending machine, strictly executing according to preset rules, unable to be tampered with and requiring no human intervention.

Case: A Simple Smart Contract

Imagine a rental contract. We could use a smart contract to specify:

• Rule 1: The tenant must pay 1 Ether (ETH) to the contract address before the 1st of each month.
• Rule 2: If the contract receives rent, it automatically sends next month's door lock password to the tenant.
• Rule 3: If no rent is received by the 2nd, the contract automatically invalidates the door lock password and notifies the landlord.

This process is completely automated, requiring no landlord to collect rent or worry about tenant defaults. Code acts like a tireless, absolutely fair judge, enforcing every clause of the contract. This is the core idea of "Code is Law."

Ethereum specifically designed the Solidity programming language and an execution environment - the Ethereum Virtual Machine (EVM) for this purpose. Developers can use Solidity to write any logic they can imagine, then deploy the code to Ethereum network nodes worldwide. From then on, blockchain became more than just a bookkeeping tool; it became a true "world computer."

5.3 Crowdfunding Miracle and Ecosystem Rise

Vitalik's genius concept quickly attracted a batch of top developers, including future Polkadot founder Gavin Wood and Cardano founder Charles Hoskinson. To raise development funds, the Ethereum team conducted an unprecedented online crowdfunding (the precursor to ICO) in July 2014. By selling Ether (ETH), they raised over $18 million worth of Bitcoin in 42 days, creating a crowdfunding record in the fintech field at the time.

On July 30, 2015, Ethereum's first stable version "Frontier" was officially released, marking the official launch of this "world computer." Soon, a developer ecosystem around Ethereum began explosive growth. Countless DApps began emerging, covering games, prediction markets, decentralized exchanges, identity authentication, and various other fields. Although early DApps were mostly crude in functionality with poor user experience, they collectively demonstrated blockchain technology's enormous potential beyond "currency."

5.4 Emergence of Competing Chains

While Ethereum explored universal blockchain platforms, other blockchain projects also began innovating from different angles, trying to solve specific problems with Bitcoin or become Ethereum alternatives.

• Litecoin: Created by former Google engineer Charlie Lee in 2011. Called "digital silver" (compared to Bitcoin's "digital gold"), it aimed to be a faster, more lightweight payment network. It shortened block time from Bitcoin's 10 minutes to 2.5 minutes and adopted a different mining algorithm.
• Ripple: Founded in 2012, its goal wasn't to challenge Bitcoin's decentralized status, but to cooperate with traditional financial institutions, aiming to transform global interbank cross-border payments and clearing systems (SWIFT). Its consensus mechanism wasn't PoW, but relied on a network of trusted validators, making it extremely fast but more centralized.

These early "competing chains" or "altcoins," together with Ethereum, greatly enriched the blockchain industry landscape, opening an era of "let a hundred schools of thought contend" where different technical routes and development philosophies competed and learned from each other. Blockchain technology's recognition also gradually expanded from geek circles to broader tech and financial fields through this process.

5.5 The Long Road of Upgrades: From Frontier to Glamsterdam

Ethereum launched in 2015 with a plan that would take a decade to execute. Frontier was explicitly a first stage, and the roadmap always included replacing proof of work, raising throughput, and reducing the burden on node operators. Each of those goals turned out to be far harder than anticipated, and the sequence in which they were finally delivered tells you a great deal about how a live network holding enormous value can change without breaking.

The Merge (September 15, 2022) replaced proof of work with proof of stake by joining the existing execution layer to the Beacon Chain, which had been running in parallel since December 1, 2020. Energy consumption fell by more than 99%, and the switch happened without downtime or loss of state. It had been promised, and repeatedly delayed, for roughly seven years.

Shapella (April 12, 2023) enabled withdrawals of staked ETH. Until that point staking was a one-way commitment, and completing the exit path is what turned staking from a locked bet into an ordinary financial activity.

Dencun (March 13, 2024) introduced EIP-4844, or proto-danksharding, giving rollups a dedicated and much cheaper data space called blobs. Layer 2 transaction costs fell by roughly an order of magnitude, which reoriented the entire ecosystem around rollups as the default place to transact.

Pectra (May 7, 2025) combined the Prague execution and Electra consensus changes, raising the maximum effective validator balance to relieve pressure from a growing validator set and bringing account abstraction capabilities to ordinary accounts.

Fusaka (December 3, 2025) activated PeerDAS, which lets validators confirm blob data is available by sampling portions of it rather than downloading everything. Fusaka also introduced Blob Parameter Only forks, minimal configuration-only changes that raise blob capacity on their own schedule; the first two followed in December 2025 and January 2026.

Glamsterdam, targeted for the second half of 2026, is headlined by enshrined proposer-builder separation (EIP-7732) and block-level access lists (EIP-7928). It would move the block-building auction into the protocol itself and enable parallel transaction execution, and developers describe it as the largest protocol change since The Merge.

A pattern runs through this sequence: each upgrade solved the binding constraint and, in doing so, revealed the next one. Dencun made rollup data cheap, which made blob capacity the limit; Fusaka raised blob capacity, which made block propagation time the limit; Glamsterdam attacks propagation. The "world computer" was never finished at launch. It has been rebuilt, in flight, roughly every eighteen months.

Summary

If Bitcoin is blockchain's "Genesis," then Ethereum is this new world's "Renaissance." It elevated blockchain from a simple value storage and transfer system to a universal, programmable decentralized application platform. The emergence of smart contracts provided developers with unlimited imagination space, and the "Code is Law" philosophy began taking root. A brand new, vibrant decentralized economic ecosystem based on DApps began quietly gestating on this "world computer's" operating system foundation. However, this unprecedented creative freedom also opened Pandora's box - a global ICO frenzy was about to arrive.