# Concepts

> Markdown export of the Gearbox Protocol documentation page for agents and retrieval systems.

Canonical page: https://docs.gearbox.finance/developers/gp-concepts
Source file: content/developers/gp-concepts.mdx
Section router: https://docs.gearbox.finance/developers/llms.txt
Section full export: https://docs.gearbox.finance/developers/llms-full.txt

The Gearbox Permissionless infrastructure is built from a set of interlocking components. Each enforces specific boundaries at the smart contract level — no role can exceed its authority, even if compromised.

- [**Contract Types & Versioning**](https://docs.gearbox.finance/developers/gp-contract-types) — The type system (`contractType`, domains, `::` notation) and semantic versioning that organize all protocol contracts. Upgrades via module replacement, not proxies.

- [**Cross-Chain Multisig (CCM)**](https://docs.gearbox.finance/developers/gp-ccm) — The governance synchronization layer. Hash-linked batches originate on Mainnet and propagate to all chains in strict sequential order.

- [**Bytecode Repository (BCR)**](https://docs.gearbox.finance/developers/gp-bcr) — On-chain registry of audited contract bytecode. System domains require DAO approval; public domains (adapters, price feeds, IRMs) are permissionless after audit.

- [**Instances**](https://docs.gearbox.finance/developers/gp-instances) — Per-chain protocol replicas. DAO-activated, managed by an Instance Owner multisig. One instance per chain.

- [**PriceFeed Store**](https://docs.gearbox.finance/developers/gp-pricefeed-store) — A marketplace linking tokens to approved price feeds. Managed by Instance Owners, consumed by Market Curators.

- [**Treasury & Insurance**](https://docs.gearbox.finance/developers/gp-treasury) — Fee distribution between curators and the DAO via TreasurySplitter, plus an insurance fund for loss coverage.

- [**Roles & Permissions**](https://docs.gearbox.finance/developers/gp-roles) — Complete role hierarchy: DAO, Technical Multisig, Auditors, Instance Owners, Financial Representatives, Market Curators, Emergency Admin, and more. Each with explicit authority boundaries.