{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6f590cfbb17232d9372e0e674408fe9a7e3e29cff19f126d39a9be4cd89a43bd",
    "signature": "0x53accd69d1a33aaa4239b0bcc8cef040b5e4678680c25da06199e2d57f59312a45b17d1ba5765a442872bd78c56c9215e9eced1a2517d0588b588a170ddda9a01b",
    "signer": "0x14FF2Ce3bf23AEeC9C140996251F6f85D8e99431",
    "userId": "53273933"
  }
}