>Only way you can have an unrigged election is vote count redundancy. You need different independent parties all counting the vote themselves in parallel.

Well that's what french do, except they count in public with members of each party volunteering for it https://en.wikipedia.org/wiki/Elections_in_France#Voting_procedures

In general, voting is done using paper and manual counting. The voter gets pre-printed ballot papers (bulletin) from a table at the entrance of the voting office (mail-in voting is not allowed in France[7]). There is one ballot paper for each candidate, pair of candidates (for departmental elections) or list. These ballot papers are also sent by mail to voters before the election. The voter then has their identity and registration checked by an official, after which the voter takes an envelope. If they also act as a proxy for another voter, they take a second envelope. The voter then enters a curtained booth (isoloir), where they are hidden from sight, and inserts the ballot paper of their candidate into the envelope. They walk to the ballot box, where the president of the voting office or their deputy formally checks their identity[8][9](in conurbations with more than 5,000 inhabitants, an identification document must be shown[10]). After the officials have acknowledged their right to vote, the ballot box is opened and the voter inserts the envelope. One of the officials, traditionally loudly, announces "A voté! (Has voted!)". This is purely ceremonial and has a double meaning: the voter's voix (voice) will be taken into account and they have accomplished their civic duty. The voter then signs the voters' list and their voter registration card is stamped.

Procedures differ when electronic voting is used. It is not widespread in France, but is used in some cities, despite controversy over its safety and effectiveness.

https://archive.ph/cUdCm#selection-523.0-526.0

The counting of votes Counting begins as soon as the polls close. It is carried out by the tellers at the counting tables, in the presence of the delegates of the candidates and the voters, and under the supervision of the members of the office.

It is broken down into several steps:

The members of the office count the signatures. The ballot box is opened, the number of envelopes, as well as ballots without envelopes, is checked: it must comply with the signatures. Otherwise, it is mentioned in the minutes. The envelopes containing the ballots are grouped in packs of 100. They are placed in the envelopes provided for this purpose (hundreds of envelopes). These envelopes are sealed. The president of the office and at least two assessors representing the lists or the candidates sign them. The last packet of envelopes, which has less than 100 ballots, is also placed in a hundred envelope on which the number of envelopes contained is indicated. This putting in an envelope does not take place when less than 100 voters have voted in the polling station. Hundred envelopes are distributed among the counting tables and opened by the scrutineers. A scrutineer opens the voting envelopes one by one, unfolds the ballot and passes it to another scrutineer who reads it aloud and intelligibly. The names on the ballots are noted on sheets prepared for this purpose and by at least two scrutineers. Any other procedure may lead to the cancellation of the election. Then the scrutineers sign the tally sheets and return them to the office, as well as the ballots and envelopes whose validity seemed doubtful to them or was disputed by electors or delegates of the candidates. It is the office that will then decide on the validity of a ballot or an envelope. The bureau then stops the number of votes cast, the number of blank and invalid votes and the number of votes obtained by each candidate or each list.

They also need every ballot printed to have a unique GUID. A list of valid GUIDs should be printed and available to the public before the election. That way it's easy to see if they've printed too many, and when counting whether a ballot is legitimate. If there are duplicate GUIDs found then neither ballot should be counted.