From now on, ALL buyers AND sellers of real estate must provide the Notary with a birth certificate or marriage certificate issued within the last 30 days, when registering a contract or escritura.
The reason is a little complicated for foreigners to comprehend, but it is to stop a spouse from selling a property from under the nose of the other spouse, and keeping all the money. In Brazil, even if a property is registered in the husband's sole name (for example), most of the time the wife must also sign to agree to the sale. So how does the Notary know if the husband is married or not? By asking for a recent issue of the birth or marriage certificate.
In Brazil, only a single person can get a copy of their birth certificate, because once you are married, the marriage is registered with the birth certificate, as an updated joint certificate. If there is a divorce or further marriages, this also gets registered together, so only a truly single person can present a birth certificate, otherwise it will be a marriage certificate.
Foreigners are faced with the same request, so I asked my Notary what we should do. He simply stated that he would accept an official translation of the birth certificate (for a single person), or marriage certificate (for a married person), providing that translation was made within the previous 30 days. Tiresome, but, unfortunately, unavoidable.