{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8f1621d496fe4cc5ac85764b6cb3f3d81ac29cfcd444dcda1b5356e00cf3afdb",
    "signature": "0x8454c90c5900ac07e7ec64a30ae4c558948343c596371be27c8458c5300d08a45d8a4cc77fcd07a1f6dbe0b95df7f303228959cdaefdc01815ba4c70aa15e9901c",
    "signer": "0x2C2F2c75318E154dAf674a078356D1412643De7D",
    "userId": "618351182"
  }
}