{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9c46122d2a998c6e03c32c4fa17cb5cf743b0279f43eff120f69fdc5de880476",
    "signature": "0x17b0050c49b34831cd27d93a5d6def391a37f72dfdffaf75b68721bce96ccfb14d03fe6e17b2650993ffd8f8b4437d6a0d29a58b8ade73d392b35c8a8b5544901c",
    "signer": "0x96f5e8f4C153CA2D7adf156D1E4f5c552d1C2F68",
    "userId": "12879587"
  }
}