Layer 1 vs Layer 2

How Layer 2 reduces cost

Rollups execute many transactions off the base chain and publish compressed data plus a proof or a challenge window back to it. Because the expensive base-chain space is shared across many transactions, each one costs a fraction of what it would directly on Layer 1.

• Fees are typically much lower than the base network.
• Security ultimately derives from the Layer 1 the rollup posts to.
• Withdrawal back to Layer 1 can involve a delay, depending on the design.
• Each Layer 2 has its own addresses, its own explorer and its own supported assets.

What a bridge actually does

A bridge does not move a coin between chains. It locks or burns the asset on one side and issues a representation on the other. The value of that representation depends entirely on the bridge's continued solvency and correctness.

Bridges have historically been among the most heavily exploited components in crypto, because they concentrate large balances behind complex code.

Before bridging, ask what backs the asset you will receive, who controls that backing, and what happens if the bridge stops operating.

Risks worth weighing

• Bridge failure or exploit affecting the wrapped asset you hold.
• Sequencer or operator downtime pausing a Layer 2 temporarily.
• Governance or upgrade keys that can change the system's rules.
• Sending to an address on the wrong network, which remains the most common user error.
• Thin liquidity for the bridged version of an asset on the destination network.

Practical guidance

1. Confirm the destination service supports the exact network you intend to use.
2. Use the official bridge published by the network itself where one exists.
3. Bridge a small test amount before a larger transfer.
4. Keep some of the destination network's native coin so you can pay fees on arrival.
5. Plan the return route before you commit funds.

Sources

• Ethereum documentation — Layer 2
• Ethereum developer documentation — Blocks