The evolution of Ethereum: from ETH 1.0 to ETH 2.0

Ethereum has grown from a groundbreaking idea in 2015 into a global decentralised platform. As its popularity increased, so did the need to improve its speed, cost, and energy efficiency. These upgrades became known as Ethereum 2.0 - now referred to as the consensus layer.

This guide explains how Ethereum evolved from its original version to today’s upgraded network.

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What is Ethereum 1.0?

Launched in July 2015, Ethereum introduced a decentralised platform where smart contracts – programs that run automatically on the blockchain – could be created. This innovation allowed developers to build decentralised applications (dApps) on a secure and transparent network.

In its early years, Ethereum used a Proof of Work (PoW) system, similar to Bitcoin. Miners validated transactions and secured the network by using computing power. While this approach worked, it required a lot of energy and came with limits.

As Ethereum became more popular, the network slowed down. Congestion led to higher gas fees, with users paying more to have their transactions processed first. These delays and high energy use made it clear that the network needed a more scalable and sustainable approach.

As more people began using Ethereum for DeFi, NFTs and other applications, the original network started to reach its limits. High demand led to slower processing times and expensive gas fees, making the network harder to use during busy periods.

To address these issues, Ethereum introduced a major upgrade known as Ethereum 2.0, or the consensus layer. This upgrade moves the network from Proof of Work to Proof of Stake, adds new features like sharding, and aims to make Ethereum faster, more efficient, and less energy-intensive.

Key features of Ethereum 2.0

Proof of Stake (PoS)

Rather than relying on mining, Ethereum 2.0 introduced a PoS system. Validators replaced miners by staking ETH to earn the right to confirm transactions and propose new blocks. Selected at random, validators were rewarded for honest participation and penalised for misconduct.

This new model dramatically cut down on energy usage and made it easier for individuals to help secure the network.

Sharding

Sharding is a planned scaling solution for Ethereum 2.0 that will eventually split the network into smaller parts called shards. Each shard is intended to process its own transactions and smart contracts in parallel, increasing throughput and reducing pressure on the main chain.

However, as of 2025, sharding has not yet been fully implemented. Instead, Ethereum’s scalability efforts have been focused on Layer 2 rollup solutions and proto-danksharding, with full sharding expected in a later phase.

The beacon chain

Activated in December 2020, the Beacon Chain acts as the central coordinator of Ethereum 2.0. It manages validator activity, organises shards, and maintains overall network consensus. Until full integration, it operates alongside the original Ethereum chain.

The key differences between Ethereum 1.0 & 2.0

Consensus mechanism:

• ETH 1.0 uses Proof of Work (PoW)
• ETH 2.0 uses Proof of Stake (PoS)

Energy consumption:

• ETH 1.0 requires high energy usage for mining
• ETH 2.0 significantly reduces energy usage - by more than 99%

Transaction throughput:

• ETH 1.0 has limited transactions per second
• ETH 2.0 offers higher throughput via sharding

Network structure:

• ETH 1.0 is a single-chain network
• ETH 2.0 introduces multiple shards coordinated by the Beacon Chain

Validator participation:

• ETH 1.0 relies on miners
• ETH 2.0 uses ETH stakers as validators

The upgrade process: Ethereum 1.0 to Ethereum 2.0

The transition to Ethereum 2.0 is a careful, phased rollout designed for stability and security.

Phase 0: Beacon Chain (December 2020)

This foundational stage introduced PoS through the Beacon Chain, setting the stage for future upgrades while running independently from the mainnet.

Phase 1: Shard Chains (From 2021 onwards)

Shard chains are planned future upgrades to improve scalability. Each shard operates in parallel, allowing multiple transactions and smart contracts to be processed simultaneously.

Phase 2 and beyond: Merging and full integration

In the final phase, Ethereum’s mainnet merges with the Beacon Chain, completing the switch to PoS. Additional upgrades include expanded shard functionality and improved security features.

During this transition, ETH 1.0 and ETH 2.0 have coexisted to maintain network stability and minimise ongoing disruption.

How Ethereum 2.0 improves scalability and sustainability

Thanks to sharding, when fully implemented, Ethereum 2.0 will be able to handle thousands of transactions per second by spreading the load across multiple shards. This relieves pressure on the main chain and speeds up overall processing. At the same time, replacing PoW with PoS slashes energy consumption by over 99%, according to the Ethereum Foundation, aligning with global sustainability goals.

ETH holders can also earn rewards by staking their tokens as validators, an incentive that both supports the network and promotes active participation.

Impact of Ethereum 2.0 on Ethereum’s ecosystem

Ethereum 2.0 is delivering meaningful benefits across the broader ecosystem, which are expected to increase markedly once full implementation is seen.

DeFi platforms will be able to run more smoothly and affordably, improving access for everyday users.

NFT marketplaces will experience faster minting and lower transaction fees, creating better experiences for artists and collectors alike.

Enterprise projects will see improved scalability and reliability, making Ethereum more viable for large-scale applications.

Security is also improving, with the PoS model discouraging bad actors, who stand to lose part of their staked ETH. This makes large-scale attacks, such as the so-called 51% attack, where a group of validators controls over half the network, far less likely.

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Conclusion

Ethereum 2.0 isn’t a one-time upgrade - it’s a continuous evolution.

Developers now use the term “consensus layer” rather than Ethereum 2.0 to reflect this. The network will continue to evolve over time through improvements such as execution layer updates, wider use of layer 2 solutions, danksharding, and stateless clients.

There’s no set end date for these changes. The Merge has already been completed, but further upgrades - like sharding - are still ahead as Ethereum works to scale and strengthen its core infrastructure.