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Every signature produces a PDF certificate with the date, the name you gave and the SHA-256 fingerprint of the exact text you signed. If you sign anonymously your name stays off the page; the certificate exists all the same.

That PDF is sealed with the electronic certificate of CAUSFY GLOBAL TECHNOLOGIES S.L., issued by the Spanish Royal Mint (FNMT). Any PDF reader can check who issued it and that nobody has altered it.

Its fingerprint is also recorded in a public blockchain, which stands as witness: from that moment a signature cannot be changed, nor a back-dated one slipped in, without the record failing to add up.

It is a simple electronic signature and it works as evidence: no law may reject it merely for being electronic. It is not an advanced or a qualified signature, which a citizens’ petition does not require either.

In Italy it is recognised by eIDAS — (UE) 910/2014, art. 25.

General information, not legal advice.