{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe37720eb9861cafc0395e796c54a78fa483a2e801d0fe7d52f633b3bccacd4c8",
    "signature": "0x0e1ef667d6a17b7426a80f9fa4b5bf4ed2b8b124c6345839c397ae9cc526f2715d2a41af4938fa85610c9299f1845b8db35e257084b6b284c9e598c6b6c635cd1b",
    "signer": "0xe73aaAF4Ef37B1326a89C9Bd10a24f28F66ab656",
    "userId": "189375294"
  }
}