Rollup Explainer
Watch 12 L2 transactions compress into a single batch, get posted to Ethereum, and finalize. Compare Optimistic Rollups (7-day fraud window) vs ZK Rollups (instant cryptographic proof).
L2 Transaction Pool
12 txs
Transfer
0.5 ETH → Bob
Swap
100 USDC → 0.04 ETH
NFT Mint
Zora NFT #4291
Deposit
500 USDC → Aave
Bridge
1.2 ETH → L1
Stake
0.1 ETH → Rocket Pool
Perp Long
10× LONG ETH on GMX
Transfer
250 USDT → Jack
Swap
1000 USDT → 998 USDC
NFT Mint
Base NFT Drop
Deposit
0.3 WBTC → Compound
Bridge
2000 USDC → Mainnet
Phase 1 of 6
Collect Transactions
The sequencer collects pending L2 transactions from users and dApps.
Transactions in mempool12 txs
Deep Dive
Users submit transactions to the L2 sequencer instead of Ethereum mainnet. Gas fees are 10–100× lower because the sequencer processes them off-chain. All 12 pending transactions sit in the L2 mempool waiting to be ordered.
Proof type: Fraud Proof (7-day window)
Built on this model:
Optimism
Arbitrum
Base
MMantle