{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5e692550226416368a460de68ce8c42717aa723e7d2768fce59c6a08d4bddf8d",
    "signature": "0xbf8d4c5614e8adea9932275a3c22082f9948f537e486b2533545fa2ba2a6cdce634d5364ff3ed640953a9a8d3bbf03a23450e5d743afb108bfeda01d320423541b",
    "signer": "0x5d90Fbab543cAF0f8A684deE1B931b2CE08c661C",
    "userId": "434220751"
  }
}