{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9ee53a12babb5d22b61e0c6fc9395fb74e48d5bed3af63a9021991632c2f796e",
    "signature": "0x332134fd72c0ab35687b8169d8c2a9589080c2401841468bafc4d1d948ab59f919c8ae9c645037a39125624df7be10fed3c6f8baa162aa3c30be9b4076d033821b",
    "signer": "0x16eC1CF4f324EACfAa9D3F0D2add22A0e775fb3f",
    "userId": "392894187"
  }
}