{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x31bfa6bba3e167f775ecdc29ad5ed60331165c2a45cabc0089ed403620860d9e",
    "signature": "0xf6b2d417386eefdf8c0b079b4bb8b2d0090b312a76b1d734b4cdb140e5051d3d226ff7c628176832b63aefc3f8af31ef40afc7794aa5c889dab0b84023baec0a1c",
    "signer": "0x80BaBdd7604de656E45b52EFA056548D7C078B36",
    "userId": "790313179"
  }
}