How would you validate that the transactions related to the house on the blockchain is correct? What do you do if you inherit the house from someone who neglect

How would you validate that the transactions related to the house on the blockchain is correct? What do you do if you inherit the house from someone who neglected to leave you the private key? You can come up with solutions to all the problems and you’ll have reinvented the entire existing process, which is inefficient and costly for a reason.