“contentsholder image” object
A “contentsholder image” object contains image information of your “contentsholder unit”
{
    "id": "2345678",
    "url": "https://img.nordot.jp/ch/images/2345678/origin_1.jpg",
    "thumb_360": "https://img.nordot.jp/t_thumb_360/ch/images/2345678/origin_1.jpg",
    "caption": "looming forecasted this weekend",
    "created_at": "2015-11-10T20:09:31+00:00",
    "updated_at": "2015-12-25T18:58:10+00:00"
}| Key name | Data Type | In List API | Description | 
|---|---|---|---|
| id | string | Y | ID of the image. | 
| url | string | Y | URL of the image. | 
| thumb_360 | string | Y | URL of thumbnail for header image, displayed in “this.kiji.is”. | 
| caption | string | N | Caption (description)of the image. | 
| created_at | string | Y | Date and time image was created. | 
| updated_at | string | Y | Date and time image unit was last updated. |