The hyperlink URL text could contain a secure hash of the gimp.org home page. Or a revision number and the hash of a public key used to sign gimp.org home page revisions. Or of a document containing three public keys, the majority of which need to sign a home page revision for it to be considered a valid value for the link. Or, as in onion services, the hash of the public key of the server hosting the document, along with a document path to send to that server when you manage to reach them. Or a name unique within a certain namespace, and a public key used to sign new versions of the document listing the name-hash mappings for the latest version of the namespace. And maybe a list of IPv4:port pairs to contact to ask for the document. Or the name of a decentralized pub-sub channel where versions of the page are periodically announced — maybe the Bitcoin blockchain. There are lots of possibilities.