If i want to create a blockchain, i create a (so called genesis) block and create a hash from it. For example i assign 0 as nonce for the first block

Do i have to pregenerate all blocks (maybe empty or just including the nonce) as my chain will finally have and they are recalculated by the miners

or do i only generate the genesis block and publish it and all other blocks are generated by miners while mining without any predefined values except the nonce?

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