{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x41ba0c8a35fb5d1234c988f0923481ffd44ccc82d83e62f39c68c426712e4903",
    "signature": "0x34a1f8e82b29ad4cc04b1d58642a027e47f4369871a36414f73beff939c93cdf5a1673b2af5dbe9a882141152ec1ae3061a7f537b21c671875bed899876702b21b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}