{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/arweave/refs/heads/main/json-schema/chunk.json",
  "title": "Arweave Data Chunk",
  "description": "Payload schema for uploading a single data chunk via POST /chunk. Chunks are used to upload large data payloads for v2 Arweave transactions. Maximum chunk size is 256 KiB.",
  "type": "object",
  "required": ["data_root", "data_size", "data_path", "chunk", "offset"],
  "properties": {
    "data_root": {
      "type": "string",
      "description": "Base64URL encoded Merkle root of the full transaction data. Must match the data_root field in the submitted transaction header."
    },
    "data_size": {
      "type": "string",
      "description": "Total size of the complete transaction data payload in bytes (numeric string).",
      "pattern": "^[0-9]+$"
    },
    "data_path": {
      "type": "string",
      "description": "Base64URL encoded Merkle inclusion proof path for this specific chunk. Maximum size 256 KiB."
    },
    "chunk": {
      "type": "string",
      "description": "Base64URL encoded chunk data. Maximum size 256 KiB per chunk."
    },
    "offset": {
      "type": "string",
      "description": "Byte offset of this chunk relative to the start of the transaction data (numeric string). Maximum value 2^256.",
      "pattern": "^[0-9]+$"
    }
  },
  "additionalProperties": false
}