json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "properties": {
          "author": {
              "type": "string"
          },
          "desc_en": {
              "type": "string"
          },
          "desc_ru": {
              "type": "string"
          },
          "flag": {
              "type": "string"
          },
          "flag_comp": {
              "type": "string"
          },
          "images": {
              "items": {
                  "type": "string"
              },
              "minItems": 1,
              "type": "array",
              "_uniqueItems": true
          },
          "schema_version": {
              "pattern": "^0\\.1$",
              "type": "string"
          },
          "title_en": {
              "type": "string"
          },
          "title_ru": {
              "type": "string"
          },
          "upload_timestamp": {
              "type": "integer"
          }
      },
      "required": [
          "schema_version",
          "title_ru",
          "title_en",
          "desc_ru",
          "desc_en",
          "flag",
          "flag_comp"
      ],
      "title": "BlackBox 3.0 task meta-info v0.1",
      "type": "object"
  }