To ensure an efficient and adequate application of that obligation, without imposing any disproportionate burdens, providers of online platforms allowing consumers to conclude distance contracts with traders should make best efforts to assess the reliability of the information provided by the traders concerned, in particular by using freely available official online databases and online interfaces, such as national trade registers and the VAT Information Exchange System, or request the traders concerned to provide trustworthy supporting documents, such as copies of identity documents, certified payment accounts’ statements, company certificates and trade register certificates. They may also use other sources, available for use at a distance, which offer a similar degree of reliability for the purpose of complying with this obligation. However, the providers of online platforms concerned should not be required to engage in excessive or costly online fact-finding exercises or to carry out disproportionate verifications on the spot. Nor should such providers, which have made the best efforts required by this Regulation, be understood as guaranteeing the reliability of the information towards consumer or other interested parties.