Bitcoin L2 | Ethereum L2 Development

Layer 2 (L2) refers to additional protocols and solutions built on top of the base Layer 1 (L1) blockchain to enhance its scalability, performance, and functionality. These L2 networks operate on top of the main L1 blockchain and enable processing of a greater number of transactions by leveraging various technologies and methods.

L2 blockchains serve as an essential complement to the core L1 blockchains, providing increased scalability and performance. They utilize diverse technologies and approaches to achieve these goals, offering a wide range of capabilities for developers and users.

Consider the Ethereum network as an example. The Ethereum blockchain faces high demand coupled with slow transaction speeds and prohibitively high ETH gas fees. The same challenges apply to the Bitcoin network, which must also handle surges in concurrent transactions.

To boost the network’s efficiency and refine its processes, a Layer 2 protocol was created.

What are blockchain layers and how do they work?

If the scalability problem can be likened to a traffic jam, then Layer 2 is the additional bypass roads and routes. This term encompasses solutions designed to improve the scalability of the blockchain.

Transaction speeds may slow down, and transaction fees may rise when the network becomes overly congested. Layer 2 aims to address these issues. To better understand how the Layer 2 protocol works, let’s first discuss Layer 1.

Layer 1

In the cryptocurrency realm, Layer 1, or the main blockchain, is the standard or base consensus layer where most transactions are executed. Examples include the Bitcoin, Ethereum, and other cryptocurrency networks. Imagine this as a highway where all the vehicles are traveling in a single direction.

As the number of vehicles increases, a traffic jam forms, and movement grinds to a halt. The same occurs with transactions on the blockchain network, leading to the need for a scalability solution.

Some Layer 1 solutions include improving the consensus protocol, such as Proof of Work (PoW) and Proof of Stake (PoS) algorithms. Another option is sharding, which involves dividing the entire blockchain into distinct databases or “shards.”

If the goal is to execute more transactions per second or reduce fees – or both – then a Layer 2 protocol can be utilized.

Level 2

Level 2 is an additional layer built on top of Level 1. Its advantage is that it doesn’t require any changes to Level 1. This means there is no need to modify or interrupt the base-level systems and processes. The goal of Level 2 is to increase the throughput of Level 1 by processing transactions outside of it.

The Level 2 protocol should offload the network, reduce its overall congestion, and avoid single points of failure. In this case, transactions will be processed quickly, smoothly, and efficiently – as they should be.

More about Level 2 Solutions

Ideally, a blockchain should be capable of processing an unlimited number of transactions per second. This characteristic is known as throughput. However, if we look at the operation of cryptocurrency networks, we see that processing an unlimited number of transactions is still a dream far from reality.

The Bitcoin main network can process between 3 and 7 transactions per second, while Visa can process around 20,000 transactions per second. On the other hand, the Bitcoin network is much more reliable due to its decentralized nature. Additionally, each transaction must be approved, distributed, verified, and confirmed by numerous nodes (computers where blockchain infrastructure data is stored).

To increase the speed and efficiency of the network without compromising its security and reliability, Level 2 solutions have been developed, such as:

State Channels

State channels use multi-signature contracts to perform fast off-chain transactions and settle them on the main network. This allows offloading the network, reducing transaction fees, and avoiding delays in transaction processing.

Sidechains

A sidechain is an independent blockchain that is compatible with the Ethereum Virtual Machine (EVM) and operates in parallel with the main blockchain. It interacts with Ethereum through two-way pegging and uses its own consensus parameters and blocks.

Rollups

These solutions allow for transactions to be performed outside the main network and data to be posted on Layer 1 after reaching consensus. They are divided into two types: ZK-rollups and Optimistic rollups.

ZK-rollups batch (or “roll up”) hundreds of transactions off-chain and create a short, non-interactive Zero-Knowledge Proof (SNARK). Using ZK-rollups, only the proof of authenticity is required, not the transaction data. This allows for faster and cheaper block confirmation.

On the other hand, Optimistic rollups don’t perform any computations but propose a new state to the main blockchain or “notarize” a transaction. Since computations are an expensive part of the process on Ethereum, Optimistic rollups are well-suited for reducing gas costs.

Plasma

This solution is designed for the Ethereum network and is created using smart contracts and Merkle trees (a way to organize large amounts of data into simpler structures). Plasma allows for the creation of an unlimited number of sidechains or miniature versions of the Ethereum network.

Level 2 offers many benefits for both the main blockchain and its users. The second-layer protocol helps to reduce the load on various cryptocurrency networks, including Bitcoin and Ethereum.

As the popularity of cryptocurrencies continues to grow, more and more people are becoming interested in their potential. It’s quite possible that other networks will soon be able to offer more accessible, faster, and cheaper transactions.

Overcoming the Challenges of Second-Layer Solutions for the Bitcoin Blockchain

Like any pioneering innovation, these solutions are not without their complexities. Ranging from issues with liquidity in routing to concerns over centralization, navigating the intricacies of Bitcoin’s second-layer solutions presents a unique set of obstacles.

Liquidity

One of the primary challenges facing Bitcoin’s second-layer solutions, such as the Lightning Network, is the issue of liquidity. Essentially, liquidity refers to the availability of funds in payment channels to facilitate transactions. When channels lack sufficient liquidity, payments may fail to go through or experience delays, undermining the efficiency and reliability of the network.

To address this problem, efforts are being made to improve liquidity management strategies within second-layer protocols. Solutions such as dynamic routing algorithms and incentivized liquidity provision mechanisms aim to optimize route liquidity and ensure seamless transaction processing.

Centralization

Another significant concern associated with Bitcoin’s second-layer solutions is the risk of centralization. Unlike Bitcoin’s decentralized mining network, second-layer solutions such as the Liquid Network operate on a federated model, where a selected group of functionaries validate transactions. While this centralization can accelerate transaction confirmation times, it raises questions about the network’s security and resistance to censorship.

To tackle the centralization problem, developers are exploring decentralized governance models and alternative consensus mechanisms. By promoting greater decentralization and community participation, second-layer solutions can uphold Bitcoin’s core principles while providing scalability and functionality.

Interoperability

Interoperability remains a pertinent issue for Bitcoin’s second-layer solutions, particularly in terms of integration with other blockchain networks. As the cryptocurrency ecosystem expands, the ability to facilitate cross-chain interactions becomes increasingly important.

Efforts to address this challenge include the development of interoperability protocols and standardized communication frameworks. By creating robust compatibility standards, Bitcoin’s second-layer solutions open new avenues for collaboration and synergy between various blockchain ecosystems.