> For the complete documentation index, see [llms.txt](https://roborus.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://roborus.gitbook.io/whitepaper/system-architecture/5.3-off-chain-services.md).

# 5.3 Off-Chain Services

To balance scalability with privacy, Roborus uses off-chain services that complement the on-chain contracts.

#### **Coordinator API**

* Matches jobs with available robots.
* Handles job bidding and selection logic.
* Ensures smooth orchestration without centralizing control.

#### **Verifier Service**

* Pre-validates zero-knowledge proofs before submission on-chain.
* Reduces blockchain load by filtering invalid or malformed proofs.
* Optimizes performance while preserving trustlessness.

#### **Telemetry Vault**

* Secure, encrypted storage for logs, maps, and sensor data.
* Data is never public; only accessible with client permissions.
* Enables audits or secondary validation without compromising privacy.

#### **Indexer**

* Tracks jobs, payments, and reputation scores for front-end applications.
* Provides queryable APIs for dashboards and analytics.
* Makes the platform more developer- and user-friendly.