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After successfully mining a block, the block and the solution is broadcast to the network. The nodes on the network in turn verify the solution. Aren't transactions that belong to the broadcasted mined block validated?

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This has been covered before (I can't give links at this juncture as I'm on mobile device), but:

  • each block references the previous block, preserving manipulation of blocks through POW
  • each Tx references it's corresponding UTXO hash
  • each UTXO requires a cryptographic puzzle (script) solution to spend the UTXOs

I'm sure someone will refer you to further information if I haven't edited this myself later on.

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