Send the PDF and say who signs. Each person receives the link by email and WhatsApp, signs from their phone — and you receive the signed document, with legal validity.
At every step — opening the link, reading the document and signing — the system records, automatically and immutably: the email of whoever acted, the IP address the action came from, and the exact time (date and time, with time zone). This trail accompanies the signed document and can be checked at any time — it is this trail, not the signature alone, that supports the authorship and integrity of the document before the law (see "Legal validity" alongside).
SHA-256 hash of the file. Before sending, your browser calculates a unique fingerprint of the PDF (the hash) — if a single byte of the file changes afterward, the hash changes completely. Save the hash shown on the confirmation screen: it is how you can prove, at any time, that the signed document is exactly what was sent, without depending on any server.
The full trail is generated automatically by DocuSeal (the signature engine) and sent along with the signed document, by email, to every signatory.
An electronic document signed by a means other than ICP-Brasil has full validity "provided the parties accept it as valid" — exactly the case here: whoever sends and whoever signs accept this means by using the tool.
The STJ (Superior Court of Justice) unanimously confirmed that lack of accreditation with ICP-Brasil does not, on its own, invalidate an electronic signature — upholding the validity of a contract signed outside the system, with an integrity trail equivalent to the one used here.
"The validity of a declaration of intent does not depend on any special form, except when the law expressly requires it" — freedom of form is the rule; an electronic contract needs no special formality to be valid.
Equates the digitized/electronic document to the original "for all legal purposes", provided integrity and authenticity are preserved — the same thing the audit trail guarantees for every signature made here.