{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd86209fa2f4a49983228b2436611cc228099c09c3c3f9b3eb3d1031f910eaf72",
    "signature": "0x437e3a4299548683bc6a40374f341d02fb88d9d1e7a74cb3f9700ec6b6cc37140e676bd7b50990ab8c7e6a5b120d9253ec77f77528268963f0cc31c459cd96871b",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}