We definitely need this !
I've seen preliminary statistics from the recent US election which appear to show what might be politely called "anomalous data" - of the states with no voter ID requirement, all had a significantly higher turnout than other states, and all except one gave the Democrats victories which were an order of magnitude above the difference between the two parties in other states, as well as not matching pre-election polling. While a few (California, New York etc) might really have returned these results, the overall picture is a concern.
More locally to me, Woking in the 2000's was notorious for electoral fraud from 2000 to 2018, when it became one of the first UK constituencies to trial voter ID. Apocryphally, at one general election there were more postal votes from a specific demographic than there were electors in the whole constituency even before in-person voting started !
RE: Voting with blockchain: security for voters and an end to "election fraud"?