{
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  "additionalProperties": false,
  "properties": {
    "sessionId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "pattern": "^[^\\s]+$"
    },
    "manifestSha256": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    },
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      "type": "array",
      "items": {
        "type": "string",
        "minLength": 1,
        "maxLength": 512,
        "pattern": "^[^\\s]+$"
      },
      "maxItems": 100,
      "minItems": 1
    },
    "messageMarkdown": {
      "type": "string",
      "maxLength": 32768
    }
  },
  "required": [
    "sessionId",
    "manifestSha256",
    "recipientIds"
  ]
}