The OS here in Brazil is Uenux (a linux based project). The signature of all uses ECDSA P521.

https://www.justicaeleitoral.jus.br/tps/arquivos/2021/apresentacao-4-tps-2021-sevin-ecossistema-urna.pdf

https://www.tse.jus.br/institucional/escola-judiciaria-eleitoral/publicacoes/revistas-da-eje/artigos/revista-eletronica-eje-n.-5-ano-5/digressoes-sobre-as-doacoes-de-campanha-oriundas-de-pessoas-juridicas

this video has 3 years.

3 years is a lot to somethings to be mature. He tells about Trust & Anonymity. You can’t trust anonymity 'coz you can trace the vote and bla bla bla. Well, you can trace the regular method too. Trust, you can’t trust the way the vote leaves the booth to the central. You know the Hash initiative? Even a small number change will be shown to everyone.

sudo dnf unzip