Do not disinform. Names were NEVER written down. Either you voted because you were on the list, or the system validated you were a voter who didn’t vote yet.
First-hand experience: Paper census lists aside, you could only vote via a centralized web service where your National ID would be noted. You couldn’t vote twice, despite (one) montage claims so.
Calling a referendum is not a crime nor felony in Spain. For the No to win, nearly 80% of the census should have voted, and that’s assuming all new votes are for No. Absurd. Spain is over, it lost. Watch it live in the markets tomorrow.