transactions – about the bitcoin, is the new block create by a miner need all other miner verify?

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Actually, I have other questions…

1.is the new block create by a miner need all other miner verify?if not, how many miners need to verify and the block main chain can +1?

2.I know bitcoin has four types of nodes. is only the miner can verify the block?how about other nodes that use Bitcoin Core but don’t mine?

3.is one blcok can only handle 1000 transactions?If one person wants to do something bad and then trades millions of times with two wallets, then the other person’s normal transactions will never be processed?



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