{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbfdfcdc0748e638293749fa5b1ea11691d7b987c9f7099ac2670e067f4abdf42",
    "signature": "0x37ecf4ee5e3def46c0f0b17d9c61a971a8cd0cb08fd33e82ee1373b9bfe1690f49f5302bcc9cbae17b7eaae5f53dd043c213608e8aa7e03de28d04a5970eabf31c",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}