What is Layer 2?
Layer 2 (L2) refers to scaling solutions built on top of a base blockchain (Layer 1) like Ethereum or Bitcoin. They process transactions off the main chain while inheriting the security of the underlying L1.
The main goal is to increase throughput and reduce fees without sacrificing decentralization or security. Different L2 technologies make different trade-offs to achieve this.
Lower Fees
Transactions cost cents instead of dollars
Faster Speed
Near-instant confirmation times
L1 Security
Inherit security from Ethereum
Explore Layer 2 Solutions
Optimistic Rollup Flow
Arbitrum One
Most popular L2 with largest TVL and ecosystem
Optimism
Pioneer optimistic rollup powering the Superchain
Base
Coinbase L2 built on OP Stack
Technology Comparison
| Feature | Optimistic | ZK Rollup | State Channel | Sidechain |
|---|---|---|---|---|
| Security Model | Fraud proofs (7-day) | Validity proofs (instant) | Channel parties | Own validators |
| Data Availability | On-chain | On-chain | Off-chain | On sidechain |
| Withdrawal Time | ~7 days | Hours | Instant | ~2 hours |
| EVM Compatibility | Full | Varies | N/A | Full |
| Cost | $0.05-0.50 | $0.02-0.30 | <$0.01 | $0.01-0.05 |
| Throughput | 2-40k TPS | 2-10k TPS | Unlimited | 7k+ TPS |
Key Takeaways
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Disclaimer
This content is for educational purposes only. Layer 2 solutions involve technical risks including smart contract bugs, bridge vulnerabilities, and sequencer centralization. Always do your own research and only use amounts you can afford to lose.