{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3833206ada9ff5b5fa66c0ec816ba171a934de100d546aa7f7f61de9c01b5079",
    "signature": "0x46399cd5ebdf28f5939f662de8b05cb956e8a49266b3241720eb0397ae100da008ec61ab60d6fd9eb287568baeda75c27e1c4767a70863b57d82105960c084751b",
    "signer": "0x4E16F4cBFf1225d4967740a3782b8F0939067117",
    "userId": "314250172"
  }
}