{
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      "startTime": 0,
      "title": "Difficulty developments in historical context"
    },
    {
      "startTime": 277,
      "title": "Factors pushing network hashrate down"
    },
    {
      "startTime": 441,
      "title": "Large difficulty adjustment of minus 17%"
    },
    {
      "startTime": 547,
      "title": "Approaching Bitcoin mining hosting"
    }
  ]
}