Congratulations on coming this far!
Proof of 5 years’ residence is a requirement for many applications for citizenship (although there are exceptions - eg when the applicant is a direct Portuguese descendant or has acquired the right to apply via marriage, or is a refugee etc.). The website asks the applicant to fill out a request to the Minister of Justice: https://irn.justica.gov.pt/Portals/33/Impressos/Nacionalidade/Modelo%20%206.1.pdf with information on 10 points (name, date of birth, marital status, nationality, parents name(s), profession, address, country(ies) where you lived, full name and address of your legal representatives/ attorneys, AND the number, date and entity that issued your residence permit).
A certificate of residence is issued by the Freguesia of the applicant for EU nationals, and for third party nationals it is/would be a SEF card (eg the card you now have for ARI plus the previous ones issued - to give a beginning and end-dates). The dates on the various cards issued would/should constitute proof of residence for ARI.
However, reading the webpage (which necessarily applies to many different types of applications for citizenship and gives minimum info) cannot substitute for legal experience. Consequently, if your current lawyers do not specialize in citizenship applications, speaking to lawyers that do specialize in such applications, would be appropriate to confirm what is required and reduce any last-minute risks! I do not remember reading any post of somebody who has come this far yet!
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