WIPO PROOF tokens are date and time stamped digital fingerprints of your file; these tokens benefit from indefinite validity and, by default, WIPO stores them for a period of 5 years. Before expiration of the storage period, WIPO will offer extended token storage options. All WIPO PROOF tokens can be verified online for free and a WIPO Account is not required to verify tokens. For more information about the token validity, see also “How long is my WIPO PROOF token valid for?” in our FAQs.