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@Amgine @luna are there any documents on the methodology? how does the system provide "evidence of ownership"?
(english would be great, french ok too)

@Amgine @luna thank you! yes, i did notice and browse the sources, but it was not immediately clear to me if anything else was happening. so regarding the timestamp, do you know if the government offers some kind of attestation service?

@slink @Amgine There is "Dossier facile" for that. You can upload all the documents, they certify that they are good, and they watermark it.

https://www.dossierfacile.logement.gouv.fr/

The doc is here: https://docs.dossierfacile.logement.gouv.fr/

@luna @Amgine @luna @Amgine it might be because i do not understand french well enough, but how does the attestation work? if received a watermaked document, how could i validate that it is still unmodified?
i actually did try to find that answer on the site, and failed.
thank you for your answers so far, i think this is an interesting problem to solve.

@slink @luna

I will need to get to a computer to check. Looking at the links on my phone I am guessing the documents are manually checked, ensuring the forms are completely filled out, possibly some data validated. Then the docs are watermarked, timestamped, a hash is likely calculated, and then a download link generated.

The hash will have a very low chance of collisions, and with the time stamp constitute proof of originality. The documents include submitter’s identifying information.

@slink

Think name, driver’s license/government identification/health/tax/social number(s), etc.

@Amgine @luna or, even better, sign (with some public key algorithm) the documents such that they can be checked offline