Arbitrum vs Ethereum

Arbitrum One and Nova are optimistic rollups using Nitro fraud proofs that compress transactions into calldata submitted to Ethereum. The Orbit toolkit lets projects deploy their own Arbitrum Orbit chains with configurable permissions. ARB token governance manages the 3 000‑plus validator whitelist and a 1 billion‑dollar ecosystem grant fund.

Ethereum is the leading smart‑contract platform, now running Proof‑of‑Stake after the 2022 ‘Merge’ and gearing up for full Danksharding. Proto‑danksharding (EIP‑4844) activated blob transactions in March 2024, slashing rollup data costs by > 90 %. The upcoming Pectra upgrade will pair Verkle trees with wallet abstraction (EIP‑4337) to simplify UX.