mainnet_hard_forks[] = {
  // version 1 from the start of the blockchain
  { 1, 1, 0, 1341378000 },

  // version 2 starts from block 1009827, which is on or around the 20th of March, 2016. Fork time finalised on 2015-09-20. No fork voting occurs for the v2 fork.
  { 2, 1009827, 0, 1442763710 },

  // version 3 starts from block 1141317, which is on or around the 24th of September, 2016. Fork time finalised on 2016-03-21.
  { 3, 1141317, 0, 1458558528 },

  // version 4 starts from block 1220516, which is on or around the 5th of January, 2017. Fork time finalised on 2016-09-18.
  { 4, 1220516, 0, 1483574400 },

  // version 5 starts from block 1288616, which is on or around the 15th of April, 2017. Fork time finalised on 2017-03-14.
  { 5, 1288616, 0, 1489520158 },

  // version 6 starts from block 1400000, which is on or around the 16th of September, 2017. Fork time finalised on 2017-08-18.
  { 6, 1400000, 0, 1503046577 },

  // version 7 starts from block 1546000, which is on or around the 6th of April, 2018. Fork time finalised on 2018-03-17.
  { 7, 1546000, 0, 1521303150 },

  // version 8 starts from block 1685555, which is on or around the 18th of October, 2018. Fork time finalised on 2018-09-02.
  { 8, 1685555, 0, 1535889547 },

  // version 9 starts from block 1686275, which is on or around the 19th of October, 2018. Fork time finalised on 2018-09-02.
  { 9, 1686275, 0, 1535889548 },
};