As is, it seems to suggest that, after changing the data, a difficult hash for block A cannot be calculated. This is not true, right? I wonder if you meant “as the data associated with block A changed, block A will be invalid as the previous hash for block A may be invalid or not difficult.” and, hence, block A will have to be mined again.

Programming, experimenting, writing | Past: SWE, Researcher, Professor | Present: SWE

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store