Since it's on a block chain, and there is therefore a specific coin that can be traced back to the fraudulent transaction. Can the transactions then be rolled back?
Edit: Assuming the underlying ICO transaction happened in Bitcoin or similar. If the funds were wired in say, USD, it would not be able to be rolled back after 3 days or so.
Edit: Assuming the underlying ICO transaction happened in Bitcoin or similar. If the funds were wired in say, USD, it would not be able to be rolled back after 3 days or so.