Brother I am very happy to see your publication which is really very well explained. You have truly shared that what is Genesis block and then you have clearly made certain calculations to check the last block

Down time of a blockchain can occurs and you have successfully given us some of the most important and most common reasons due to which downtime of a blockchain can occurs as well as you have also successfully interpreted that is steam have down time since it's creation or not

Over all your publication is appreciatable and you have made commendable efforts that's why I wish you success and good luck in this engagement challenge and may you get more and more in your future