Optimistic

Optimistic Rollups operate on the assumption that all transactions are valid.
How it works
1. Send transactions from users to L2 chain and L2 operator(a.k.a. Sequencer)
2. Sequencer orders, executes and batches transactions.
3. Sequencer submits blob transactions, including KZG commitment to L1 full node.
Blobs
- Versioned hash: identifier
- KZG commitment: cryptographic proof for verification
- Proof: to check the validity of the commitment
트랜잭션 검증: fraud proof each time window.
blob 검증: KZG commitments.
처리된 트랜잭션 확인: blob, L2 contract.

1. Arbitrum

Arbitrum Nova

Arbitrum AnyTrust Chain = Arbitrum AnyTrust Protocol

running on Ethereum mainnet with permissioned party as known DAC.

great for gaming.
Arbitrum One

Arbitrum Rollup Chain = Arbitrum Rollup Protocol

running on Ethereum mainnet; Fully trustless

great for De-Fi.
Arbitrum Nitro

The node in order to service and/or interact with an Arbitrum chain.

a fork of Geth to implement Arbitrum's state transition function and uses WebAssembly as its underlying VM for fraud proofs.