var checkpoints = {
  100000: 'c0fb4e2c6b96e6871a2acfd12299fdbb95c71b0887b03469fb2e313e75a749fd',
  200000: 'a939b5c2f2a9d7430f833a9ffc1ecd7eb433add3671677809cbf6b8bdc1430ec',
  300000: '77ec9ac7085e351acd58a103ba3c8b207e9ae3afcc4f348fece25908129040fc',
  400000: '7ece07533f8ef9366121865219d2cf3d2ec4c4cd1cebc8f80493a66ebc0e2c67',
  500000: 'fec49695e922d3842feb28bbdd4219ab4704a61083a4d4b87229f27626ba1b0c',
  600000: '6592f6f6ad67d29c07ce993c8167ed2d4713976b9de701b0edb95da67e5b4fd2',
  700000: 'ca10962bb25a4184bb3cb6432efaa9b4bb0c743e1130527443912d87c360459a',
  800000: 'af8cb31e71ba877d0d8c95c580d6980cd14fe605c81e79a35b4acba9980c9307',
  900000: '8debc9619c2e204fdeaa996b9917b6b95b965f4a2635981cb626d8780c4a43af',
  1000000: 'b68bd62db4374adf1ba626edc90580aca90e4cad53c1920b697d45c4df0994fd',
  1100000: 'a6d51d335b9a382ca8683c849b819fe5f9cec43a5f51beaa7e2f44457bf5ed16',
  1200000: 'f2161c0da5ab6af306bbb8b4da3d5b768d17cd93178d27d414b77d9eb4398f08',
  1300000: '3751cc16a35f91c61a6e9fcdf3cbdbbf631a92cad2221a9e36e6fb8833162b91',
  1400000: '705aa04e6bc0a9ecac1fb2e37eccb3cccc0ae1e3f1f558cbe9791cad1fca565f',
  1500000: '30961f1a45cd0b6a7d58c28769d6b77babc068d09db4934ff9aa4922ee0551f2',
  1600000: '5b0d109822240bcdaa73c89c21c974563405f3b10949a8ed56d8e6c67e97eeca',
  1700000: '684818f8534c7f8ef941ce02e7c34cb44d7ede5cace36cb6f2d70532283dbafe',
  1800000: 'cc560b5cf3ff15d57cc1d34fff827eceee69cd068a949cc8f84fc4a541980390',
  1900000: '60912e3b6cd7aee10705a683d6653e5862800a5b8e4ea12ea587238db2c75b6d',
  2000000: '4a8cb5ca397b7c92c270ccfa9139ffb93f7c5b9515e52486c635c7a1dee9d221',
  2100000: 'ceb4ddb46a9385096bd161bd84b68af29670958d942c7ef85c95ec796cce5f01',
  2200000: 'ae999db0281b4b0238da15f116b929fc332cb1b19629d4355958220508787558',
  2300000: 'a0ac730ed5961f231d7312f3d910fa8707e91455405c0232486c974651a10838',
  2400000: '2dfb9b767428dbd02995074635e3aa54c044fe130dde85dd5e9a533d329be1d2',
  2500000: '478b768a963bd4357df2a94f633774ffb0e586726c10fedff79bf0293b21512e',
  2600000: 'a35101676beabefa360239eeab2b99c05a458f2b6bd614154fc740792ed1ba77',
  2700000: '9e9f0e1b199aa6a506ce359928ca4fbde61b69368bacefa37f8bafa967f48443'
}

var reversedCheckpoints = {}

for (var height in checkpoints){
  var checkStr = checkpoints[height];
  var strArray = checkStr.match(/.{1,2}/g);

  var reversedArray = strArray.reverse();

  var builtStr = "";

  for (var str of reversedArray){
    builtStr += str;
  }

  reversedCheckpoints[height] = builtStr;
}

console.log(reversedCheckpoints)