optimism by hairyf/blockchain-master

Skill based on OP Stack specs (ethereum-optimism/specs), generated from sources/optimism. Doc path: sources/optimism/specs/.

The OP Stack is the software stack powering Optimism (OP Mainnet), Base, and other L2s. It defines how the L2 chain is derived from L1, how deposits and withdrawals work, standard predeploys/precompiles, fault proof components, and system configuration. Use this skill when building or debugging L2 nodes, batchers, bridges, withdrawal tooling, or contract integrations.

Core References

Topic	Description	Reference
Protocol overview	Architecture, L1/L2 contracts, rollup node, derivation loop, Engine API	core-overview
Derivation	Sequencing window, batch/channel format, pipeline, payload attributes, Engine API versions	core-derivation
Bridges and messaging	Standard bridges, deposits (0x7E), withdrawals (prove/finalize), cross-domain messengers	core-bridges-and-messaging

Features

Topic	Description	Reference
Predeploys and precompiles	L2 predeploy addresses and interfaces; P256VERIFY and other precompiles	features-predeploys-precompiles
Fault proof	Program, VM, dispute game, pre-image oracle, L1 dispute contracts	features-fault-proof
Batcher and SystemConfig	Batch submitter loop; SystemConfig (batch inbox, batcher hash, fee scalars)	features-batcher-and-system-config

Best Practices

Topic	Description	Reference
Deposits and withdrawals	Address aliasing on deposits, no aliasing on withdrawals, using l2Sender() on L1	best-practices-deposits-withdrawals