They attest the upload date and time of documents
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ComprasPT follows the legislation imposed by the no. 1 of the 55th article in the Portuguese Decree-Law no. 96/2015, of August 17, which regulates public e-procurement platforms.
"All documents submitted on electronic platforms, as well as all acts that, under the terms of the PCC, must be practiced within a certain period, are subject to the affixing of timestamps issued by an accredited and certifying body for the provision of a time stamping service."