Layer 2 Networks in Crypto: Exploring Scalability & Velocity [2023]

A blockchain’s scalability refers to its means to accommodate an ever-increasing variety of customers and transactions. Scalability not solely determines a blockchain’s transaction pace, however its potential for development and widespread adoption.

As a result of transaction capability is hard-coded into these blockchain methods, their long-term development is on the mercy of what number of transactions they will course of. Layer 2 networks deal with these points by processing transactions independently of the primary chain via a secondary framework. This allows congested Layer 1 blockchains to stay speedy and environment friendly, whilst demand skyrockets.

However what precisely are Layer 2 options? And the way do they differ from Layer 1 blockchain networks? We cowl the necessities on these and different matters straight forward.

A fast primer on blockchain layers

Layer 1 refers back to the underlying structure of a blockchain itself. Bitcoin, Litecoin and Ethereum are all examples of Layer 1 blockchains, or “mainnets”. Layer 1s are so named as a result of they’re the first networks inside their respective ecosystem. Layer 1 networks set up the parameters for a way a blockchain operates. This consists of issues like which consensus mechanism the community makes use of, common block time and numerous different guidelines. Layer 1 blockchains can independently confirm and finalize transactions with out the necessity for exterior networks, however transaction instances can sluggish significantly during times of excessive community site visitors.

Layer 2 options are like miniature, secondary blockchains that run parallel to a Layer 1 community to enhance effectivity and scalability. These options take over a lot of the transaction processing work that will ordinarily be accomplished on the primary chain. As soon as the transactions are processed and validated on a Layer 2 community, the data are transferred to the primary chain to be completely recorded. Among the best-known Layer 2 networks embrace Ethereum-based Arbitrum and Bitcoin-based Lightning Community.

What’s a Layer 2 community?

In easiest phrases, Layer 2 options are protocols that sit atop a Layer 1 blockchain to enhance some side of its efficiency, most frequently scalability or privateness. Layer 1 networks like Bitcoin and Ethereum expertise sluggish efficiency at instances of excessive community site visitors. Layer 2 options shift transaction processing work away from the primary chain till accomplished transactions are able to be recorded. This frees up important community capability on the Layer 1 chains, guaranteeing their continued speedy and safe operation. Layer 2 blockchains are in a position to conduct transaction exercise a lot quicker as a result of they’re engineered for max scalability, versus decentralization and safety being the precedence for Layer 1 chains.

A standard challenge with Layer 1 networks is their poor scalability, which we’ve seen with Bitcoin and different main blockchains as their consumer load has elevated. A significant a part of Layer 1 blockchain safety is their immutability, or the lack to change them. Whereas that is important for safeguarding customers from would-be scammers and thieves, it makes implementing sure modifications to a Layer 1 community’s performance nearly not possible.

Advantages of Layer 2 options

Layer 2 options play an essential position on the earth of cryptocurrency, making transactions quicker and cheaper whereas addressing main blockchains’ largest limitations. As Layer 1 networks turn out to be much less congested via using Layer 2 options, their scalability improves, which permits them to accommodate extra customers with out community slowdowns.

Layer 2 networks’ emphasis on scalability permits them to carry out 1000’s of transactions per second. This enables Layer 1 blockchains to vastly improve their transaction throughput with out modifying their building or compromising their safety or decentralization. Bitcoin, for instance, is simply able to processing roughly 7 transactions per second (TPS). In contrast, Lightning Community, the most well-liked second-layer protocol for Bitcoin, can theoretically course of as many as 1 million transactions per second. Since BitPay started its assist for the layer 2 platform, Lightning Community funds processed by BitPay rose over 200%.

How Layer 2 scaling options work

Transactions carried out through the Layer 2 community are consolidated then broadcasted to the mainnet, fairly than broadcasted 1 by 1. By sparing the mainnet a lot of the computation-heavy validation work, Layer 1 blockchains are in a position to scale extra successfully. Extra particular particulars about how info is packaged and transferred between L2 and L1 networks will range based mostly on the particular sort of L2 in use.

Varieties of Layer 2 options

There are a number of completely different classes of Layer 2 networks, together with state channels and rollups. And whereas the best way they’re applied and the way they perform range, all of them serve the aim of offering customers with a low-cost, quicker various to transacting on the L1, however with related safety advantages as utilizing the L1.

State channels

State channels enable two or extra individuals to conduct a number of off-chain transactions with out broadcasting them to the whole community. This spares main blockchain networks from numerous resource-intensive processing work. It has the impact of releasing up community capability, lowering transaction charges and enabling on the spot settlement. The Lightning Community, constructed upon the Bitcoin blockchain, is an instance of a state channel Layer 2 protocol.

Rollups

Rollups are methods that course of transactions on a Layer 2 blockchain earlier than porting them again to the primary chain, lowering transaction prices. In rollups, transactions are bundled collectively, generally 1000’s at a time, and recorded on the Layer 2 chain earlier than being “rolled up” right into a single transaction. That transaction is then fed to the slower, costlier mainnet for recording, splitting the price of a single transaction throughout many customers.

There are two main sorts of rollups: Optimistic rollups and zero-knowledge rollups (or ZK-rollups)

Optimistic rollups enable Ethereum customers to execute sensible contracts outdoors the mainnet with out broadcasting each transaction again to the whole community. Because the identify implies, optimistic rollups assume all off-chain transactions are legitimate. As soon as every batch of rollups is submitted to the mainnet, there’s a “problem interval”, often 7 days lengthy, throughout which any consumer can problem a rollup transaction via what is called a fraud proof. If the proof finds the transaction was incorrectly carried out, the rollup executes the transaction once more with the corrected info. If the fraud proof fails and there aren’t any different challenges, the bundle of transactions is completely recorded on Ethereum after the 7-day window. Some examples of optimistic rollups embrace Arbitrum, Optimism and Boba.

Zero-knowledge rollups, or ZK rollups, enhance transaction throughput by processing 1000’s of transactions per second whereas solely publishing primary abstract information to the mainnet. ZK rollups validate transactions by producing cryptographic proofs generally known as validity proofs. With zero-knowledge rollups, interactions between chains are ruled by sensible contracts. As soon as customers signal a bundle of transactions, a 3rd occasion generally known as a “prover” verifies them earlier than including them to the processing queue. At periodic intervals, provers batch up 1000’s of queued transactions to generate what is called a zero-knowledge proof. This can be a transient and particular piece of information which might be verified nearly instantaneously with none extra transaction info. The prover then submits their proof to the mainnet, which a wise contract then verifies and data. Some examples of ZK rollups embrace StarkWare, zkSync and zkPorter.

A word on sidechains and validiums

Sidechains are unbiased blockchains that intently align with a foremost chain, permitting numerous interactions between the layers. Sidechains enable sure digital property to be transferred between completely different blockchain networks, enabling larger interactivity and compatibility throughout chains. The first downside of sidechains, nevertheless, is that they aren’t coated by the safety equipment of its mum or dad Layer 1 chain. This requires them to conduct their very own safety, utilizing both proof-of-work or proof-of-stake consensus. A widely known instance of a sidechain is Bitcoin’s Liquid Community, or Polygon (MATIC) for Ethereum.

Validiums are a kind of scaling resolution designed to enhance throughput by processing transactions off the Ethereum mainnet. Just like ZK rollups, validiums make the most of zero-knowledge proofs to confirm these transactions with out storing any transaction information on the mainnet. Validiums are able to processing as much as 9,000 transactions per second, in comparison with Ethereum’s common of round 30 TPS.

Wrap up on Layer 2 networks in crypto

Because the variety of crypto customers worldwide continues to develop, the most well-liked cryptocurrency networks have confronted scalability challenges as they wrestle to maintain up with the spikes in demand. Left unaddressed, these challenges threaten the longer term development of the most important blockchain ecosystems. Layer 2 options enable mainnets to successfully outsource a lot of the transaction processing work to extra scalable networks. The rerouting of community site visitors ensures quicker transaction speeds, decrease charges, and permits for larger scalability.