> Do Brazil have anything similar with auditors or inspectors?

Every year before elections, the government entity responsible for the voting machines invites hackers to run penetration tests [0].

> Or at least some crypto connecting the vendor to the polling locations?

The machines have no internet access at all.

[0, Portuguese]: https://www.tse.jus.br/comunicacao/noticias/2020/Abril/voce-...