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6.4🚀 Advanced Topics

Layer 2 Solutions

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One of blockchain's most persistent challenges is scalability — the ability to process large numbers of transactions quickly and cheaply. Base-layer blockchains like Bitcoin and Ethereum deliberately prioritise security and decentralisation over speed, which limits throughput. Layer 2 solutions solve this by processing most transactions off the main chain while inheriting its security.

The Scaling Problem

Bitcoin Base Layer

~7 TPS

Fee: $1–$30

Ethereum Base Layer

~30 TPS

Fee: $5–$100

Visa Network

24,000 TPS

Fee: Cents

Arbitrum (L2)

4,000+ TPS

Fee: $0.01–$0.50

Types of Layer 2 Solutions

⚡

Optimistic Rollups

Examples: Arbitrum, Optimism, Base

Assume all transactions are valid and post them to Ethereum. A "fraud proof" window (7 days) allows anyone to challenge invalid transactions. Simple and compatible with existing Ethereum smart contracts (EVM-compatible).

Speed

Seconds on L2 (7-day withdrawal to L1)

Fees

$0.01–$0.50 per tx

Throughput

2,000–4,000 TPS

🔐

ZK Rollups

Examples: zkSync, StarkNet, Polygon zkEVM

Generate a zero-knowledge cryptographic proof for each batch of transactions. This proof mathematically verifies all transactions are valid — no fraud window needed. More complex to build but faster finality.

Speed

Near-instant finality, faster L1 withdrawals

Fees

$0.01–$0.10 per tx

Throughput

2,000–20,000 TPS

⚡

Lightning Network (Bitcoin)

Examples: Bitcoin L2 only

Creates off-chain payment channels between parties. Users lock Bitcoin into a channel and transact indefinitely off-chain. Only the opening and closing transactions are recorded on the Bitcoin blockchain.

Speed

Milliseconds (instant)

Fees

Fractions of a cent

Throughput

Millions theoretically

🔗

State Channels

Examples: Raiden Network

Similar to Lightning — two parties lock funds into a smart contract and transact off-chain. Only final state is settled on-chain. Limited to the participants of the channel, unlike rollups which are open to all.

Speed

Instant within channel

Fees

Near-zero within channel

Throughput

Very high within channel

Why Layer 2 Matters for Investors

Layer 2 growth directly benefits Layer 1 assets. As Ethereum's L2 ecosystem (Arbitrum, Base, Optimism) grows, demand for ETH — used to pay L1 settlement fees — increases. The L2 ecosystem also expands the total addressable market for DeFi, NFTs, and tokenised assets, driving adoption of the broader ecosystem. Wealtii's funds include Ethereum, giving investors exposure to this flywheel.

Exposure to Ethereum's L2 Ecosystem

Wealtii's index funds include Ethereum as a core holding — benefiting from both ETH's role in the base layer and the explosive growth of L2 networks built on top of it. Explore our funds →

Frequently Asked Questions

What are Layer 2 solutions in crypto?

Protocols built on top of base blockchains that process transactions off-chain for speed and low fees while inheriting base-layer security. Examples: Arbitrum and Optimism for Ethereum; Lightning Network for Bitcoin.

Is Layer 2 safe to use?

Well-established L2s like Arbitrum, Optimism, and Lightning Network have billions secured and years of operation. They introduce additional smart contract risk vs the base layer, but using audited, battle-tested protocols significantly manages this risk.

Disclaimer: Educational content only. Digital assets are volatile. Wealtii is early-stage and NOT YET REGULATED in all jurisdictions.

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