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hi thanks for being here my name is Stefano tempesta and in this video I want to show you how you can digitally sign and verify documents on a blockchain and I'll do this together with two friends of mine so please meet Laura Laura is a student 23 years old from the Netherlands she want to travel to Australia and walk there but she's going through all the complexity of immigration getting a work visa just to prove that she has a degree knowledge of English and a lot of paperwork this process is taking days weeks even months is very cumbersome and is wasting everybody's time now meet my second friend of mine please meet Robert Robert is a doctor he's Australian and is looking after a lot of patients but you know every other year he has to go through a requalification attend some training courses and prove to the authority for practitioners that is still qualified again a lot of paperwork to produce a documents waste of time on all the parties he wants to focus on his job on inspections is there a way to do all these better in a more efficient way more quickly well it's clear that Laura and Robert have a common challenge they have to prove that their qualification the certificates exist that they are authentic that they not been forged and they need to prove it with the relevant authorities so in a way that there is an evidence that is verifiable but all parties this is the process of digitally signing documents but what can block chain add to the existing established processes of digital signature in the with blockchain you can imagine a world in which documents are embedded in digital code and store in a transparent shared database where they are protected from deletion tampering or addiction so in this world every agreement every process every task and every payment will ever teach the record in a signature that could be identified validated stole assured so intermediaries like lawyers brokers any institution may not maybe have a different role may not be longer necessary individual organization even machine will freely transact and interact with one another with little friction quickly in minutes this is the immense potential of blockchain the potential application content decentralization and distribution is enormous people will own their own digital identity and the record think of identity of residence documents medical records educational professional certificate licenses then they will create a single immutable and verifiable record store all these documents and their metadata as we will see in soon can be issued on the blockchain and be digitally signed no more fake certification no more degree bills no more Photoshop papers students for example may apply for further study a job emigration to another country they may require to prove the level of study or knowledge of language at attended university entities like recruiters employers the government the universities they can verify...