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I understand that the initial genesis.json attributes are a permanent thing, and it cannot be changed retroactively.

But what I want to know is which parameters are changeable afterwards and how?

  • Could I change the gasLimit afterwards somehow? By using an account/key with the right rights?
  • Could the difficulty be changed afterwards? And which params can't be changed (I'm guessing alloc is only a genesis param?)

Or am I misunderstanding, and can every block afterwards have their own gasLimit?

  • And finally, what happens when you want to update/upgrade your blockchain?

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