How does a new bitcoin fork start? How is the first block generated?

Question

bitcoin

At the moment, a lot of forks have been divorced, it became interesting how the new fork starts? How is the first block calculation algorithm started? What is needed for this?

Answer 1

A block may not contain transactions. At the beginning, the complexity is 0. I.e. in fact, any empty block will be valid. Well, then the complexity will adjust itself.

Answer 2

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