Dedit is an online cross-blockchain platform that easily enables users to notarize any type of file and digital document, allowing you to certify the originality and existence at a certain date and time. Within each transaction recorded on the blockchain is entered a unique identifier, the hash value, calculated using an algorithm, which unequivocally characterizes the file, as if it were his unique and incontrovertible fingerprint. The immutability and time stamping of the transaction recorded on the Blockchain are linked to the fingerprint, making it possible, at any time, to prove that this document existed, exactly in that state, at the time of time stamping. Decree Law 135/2018, converted into law on 7 February 2019, which in Article 8-ter paragraph 3 states that storing data on a blockchain is a valid way to prove its existence on that date. Dedit is the only platform in Europe that allows to notarize on "Algorand", a new generation blockchain developed by the Italian Turing Prize Prof. Silvio Micali, able to guarantee security, competitive prices and fast transactions.