{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6254ce69fd6bdf6a65aa5cf1f5057d47fa45d234d35b9cda1417304cda40e174",
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    "signer": "0xd7BB3B7eA7B0cCDCEF3506c95DA49195eABe24b9",
    "userId": "880373640"
  }
}