Transactions processors form a small world network. This can include direct fiber optic links between them. I'm sure some enterprising network will rise to commercial demand (Equinix?). I suggest studying how networking technology scales vs computing and storage. The network links, and hence, big blocks, are NOT going to be the bottleneck.
George Gilder wrote a great book on this years ago: <a href='https://www.goodreads.com/book/show/1225914.Telecosm'>https://www.goodreads.com/book/show/1225914.Telecosm</a>
Transactions processors form a small world network. This can include direct fiber optic links between them. I'm sure some enterprising network will rise to commercial demand (Equinix?). I suggest studying how networking technology scales vs computing and storage. The network links, and hence, big blocks, are NOT going to be the bottleneck.
George Gilder wrote a great book on this years ago: <a href='https://www.goodreads.com/book/show/1225914.Telecosm'>https://www.goodreads.com/book/show/1225914.Telecosm</a>