BlockChain Details

BlockChain Details

hi please answer these questions.

  1. is hashing at block level only..?
  2. who create the new block in blockchain.?
  3. if one block have 400 transaction and 2nd block have 300 transaction and 4th one have 500 transaction. Suppose only accepted 300 transaction block then question is on what condition a block stop its transaction and a part of blockchain? What is the condition on which a new block part a blockchain? How we validate wrong gray blocks?
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