{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf6cced18563adce7a4b863ba3e97a57ad1e9ae9b9a9daa33d33a46831a8976c7",
    "signature": "0xc431eb1215608cea2a6853c06fcda07f10f156a9013186f800f324f66a53afbb18b0507008a028b1faf7632bea04efdc085634698beff5efde98aac3230540091b",
    "signer": "0xEFAB3332CD5EA33e9817aa57B32CaCb8Acf973A4",
    "userId": "407216161"
  }
}