{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc50b3ffa7a8ed49b07cf596f7be6a6602608ad2b1af115fe0ee61aaf282a979c",
    "signature": "0x03b50da780692fe5483739b8115da270deb7f399ef7e2ea6b6becff8738a4ec77f1ad26157ba912b352396eda6140fda41e97983351ccd23825580ea202def0b1b",
    "signer": "0x4f60489Df5861e8Ab5af441aD0F2B92e3e28915F",
    "userId": "844535935"
  }
}