{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd56f2ee868a354650307d3135ebbb32c949048a34441d012d62180604b5922ca",
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    "signer": "0x99579cBBf75032De98d51e1f45bC64e75B4B9e1A",
    "userId": "529938035"
  }
}