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Arbitrum Nitro L2 development — deployment, cross-chain messaging (Retryable Tickets), Orbit chains, ArbOS precompiles, bridging, and gas model differences from Ethereum.
Arbitrum is the largest Ethereum L2 by TVL, running an optimistic rollup via the Nitro execution engine. Nitro compiles a modified Geth (go-ethereum) to WASM, enabling full EVM equivalence with fraud proofs. Arbitrum One targets general-purpose DeFi, Arbitrum Nova uses AnyTrust (data availability committee) for high-throughput gaming/social, and Orbit lets teams launch custom L3s settling to Arbitrum.
AI models trained before late 2024 carry stale assumptions about Arbitrum. These corrections are critical.
block.number returns the L1 block number, not L2 — On Arbitrum, block.number in Solidity returns the L1 Ethereum block number at the time the sequencer processed the transaction. Use ArbSys(0x64).arbBlockNumber() for the actual L2 block number.block.timestamp is the L1 timestamp — Same issue. block.timestamp reflects L1 time. For L2ley timing use ArbSys(0x64).arbBlockNumber() and correlate.npx skills add 0xinit/cryptoskills --skill arbitrumHow clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
Mostly clear, but there are still a few confusing or poorly structured parts.
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
Some hints are present, but an agent still has to guess many steps.