{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x30444cafc8ffdd9b59e21d871feada66d7de87ca0b55f503b7c6b54e743c4638",
    "signature": "0x94a984d7c96fe255466cbb022e3e8099ce704fc4ec28a565f4c6b57e2dd7849f64578373f0587ff44a6dd3630cc4a57fa740fd8755902858b588712933a0beb81c",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}