Evidence Format

Evidence in Kleros V2 is stored off-chain (IPFS/Arweave) and referenced on-chain via URIs.

Evidence JSON Structure

{
  "title": "Delivery Confirmation",
  "description": "Screenshot showing the package was delivered on time",
  "fileURI": "/ipfs/QmFileHash...",
  "fileTypeExtension": "png",
  "fileHash": "0x..."
}

Fields

Field	Type	Required	Description
`title`	string	Yes	Brief title of the evidence
`description`	string	Yes	Description of what the evidence shows
`fileURI`	string	No	URI to the evidence file
`fileTypeExtension`	string	No	File extension (pdf, png, etc.)
`fileHash`	string	No	Hash of the file for integrity verification

Submission

Evidence is submitted by calling the appropriate method on the Arbitrable contract or evidence module, passing the IPFS URI of the evidence JSON.

Moderated Evidence

The ModeratedEvidenceModule contract provides spam protection for evidence submission through a bonded challenge mechanism. This is particularly useful for disputes on L2 chains where gas costs are low and spam is cheap.

Overview

Architecture

Contracts (V2)

Contracts (V1)

Data Formats (V2)

SDK (V2)

Evidence JSON Structure

Fields

Submission

Moderated Evidence

​Evidence JSON Structure

​Fields

​Submission

​Moderated Evidence

Evidence JSON Structure

Fields

Submission

Moderated Evidence