Digital receipt for a transaction

A readable medium using computer to serve as a record of the existence of a transaction, storing readable media computer: a digital receipt of the transaction found to be presented to a user, the digital receipt comprising: a description of the transaction format intelligible; an unforgeable proof that the transaction has occurred; and a proposal unforgeable verification test, without additional human interaction for identification, wherein: the transaction consists of the existence of a document at a specific time; the digital receipt includes a form in a standard markup language, including the form the document, encoded as hidden text; the description of the transaction comprises: a name that identifies the document and a time identifying the specific time; the test comprises an indicator unforgeable timestamp digitally signed, encoded as hidden text in the form, the timestamp indicator comprising: a fingerprint of the document and the time stamp of the document; and the proposed verification on the form, comprising a user-activated element, so that activation of said element transmits the hidden text of unforgeable evidence and the hidden text of the document to a service provider for verification.