> ## Documentation Index
> Fetch the complete documentation index at: https://kleros-mintlify-6ebc7975.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> High-level Kleros V2 architecture on Arbitrum: KlerosCore, dispute kits, sortition module, policy registry, governor, and cross-chain gateways.

Kleros V2 is a modular dispute resolution protocol deployed on Arbitrum One with cross-chain support.

## Component Interaction

```mermaid theme={null}
graph TB
    Arbitrable[Arbitrable] -->|Creates Dispute| Arbitrator[KlerosCore]
    Arbitrator -->|Resolves Dispute| DisputeKit[Dispute Kit]
    Arbitrator -->|Draw Jurors| SortitionModule[Sortition Module]
    Arbitrator -.->|Ruling| Arbitrable
    DisputeKit -.->|Decision + Coherence| Arbitrator
    SortitionModule -.->|Juror| Arbitrator
    Policy[Policy] -->|Describes| Courts[Courts]
    Courts -->|Configures| Arbitrator
    Governor[Governor] -->|Governs| Arbitrator
    Arbitrable -->|Template| DTR[Dispute Template Registry]
    DTR -.->|TemplateID| Arbitrable
```

## Core Components

| Component                   | Role                                                          |
| --------------------------- | ------------------------------------------------------------- |
| **KlerosCore**              | Central arbitrator dispute lifecycle, appeals, rulings        |
| **DisputeKitClassic**       | Voting, commit-reveal, appeal funding, incentive distribution |
| **SortitionModule**         | Weighted random juror selection from staked PNK               |
| **PolicyRegistry**          | Court policies stored on IPFS                                 |
| **DisputeTemplateRegistry** | Templates defining what jurors see                            |
| **Governor**                | On-chain governance execution                                 |

## Cross-Chain Architecture

For foreign-chain Arbitrables, the Gateway system abstracts away bridging:

| Component          | Chain         | Role                                           |
| ------------------ | ------------- | ---------------------------------------------- |
| **ForeignGateway** | Foreign chain | Acts as Arbitrator for the Arbitrable          |
| **HomeGateway**    | Arbitrum      | Acts as Arbitrable for KlerosCore              |
| **Vea Bridge**     | Both          | Message transport with optimistic verification |

## Security Model

1. **Cryptoeconomic Security**: Jurors stake PNK as collateral
2. **Random Selection**: Weighted random draws prevent manipulation
3. **Incentive Alignment**: Coherent voters earn, incoherent voters lose stake
4. **Appeal System**: Multiple review rounds with increasing juror counts
5. **Emergency Controls**: Guardian can pause, Governor can unpause