The yappadappadoo Store is a Blockchain linked ecosystem, bringing Progressive Web Applications (PWA) to all mobile devices worldwide. By combining the advantages of two young future-proofed technologies, Blockchain and Progressive Web Applications, yappadappadoo will establish itself as a David against the market-dominating Goliath app stores of Apple and Google and will achieve a significant market share. Until now, apps have been prisoners of their own separate ecosystems. Now the app world is making the long-awaited break for freedom. A new generation of applications will revolutionise the app market: Progressive Web Applications (PWA). Key features of PWA: Multi-Platform: Independent of individual devices and operating systems. No download. No installation. No updates. Lightning fast. Clever enough to work offline. On average, less than 1% of the size of native apps. Progressive Web Applications are a blessing for growth markets like India, China and Africa, where most users can only avail of poor network coverage and lower quality hardware. India, for example has 20% of all mobile phone users worldwide. However, 99% of the network coverage in India is still based on 3G. Early adopters like Trivago, Alibaba, Twitter, Tinder, Pinterest and Forbes are already enjoying remarkable success with PWA, achieving significantly higher user-engagement, better conversion rates and longer usage times. PWA beat native apps in all disciplines. There are only two reasons why we have not yet seen the rapid spread of PWA. Firstly, these high-performance, first-class applications are based on new technology which is just reaching ready-to-market status. Secondly, app-developers are only now catching up with the expertise necessary for producing PWA. Of course, for purely commercial reasons, it is not possible to find this type of application in the dominant app stores of Apple and Google: web apps will eat into their business! The yappadappadoo Store is the first and currently the only app store for PWA with links to the Blockchain for payments, smart contracting, app selection and reviews. Therefore, yappadappadoo does not store any personal user data – we operate with Blockchain-IDs only. yappadappadoo apps are Multi-Platform. They work with Android, IOS, Windows or any other devices. This is the only App Store, which reaches all 4.5 billion users of mobile-devices and tablets. To increase the number of PWA provided in our App Store, yappadappadoo will provide an integrated drag & drop suite simplifying the creation and development of PWA, the yappadappadoo-Suite. An extremely attractive incentive-program will further boost the availability of PWA. The yappadappadoo Store will link to the Blockchain. Independence, transparency and security are guaranteed. Data leaking is out of the question. Apps and In-App content can be bought with tokens, the yappadappadoo “Flints” (FLI). This independent cryptocurrency will be available to everyone, which makes it especially interesting in growth markets where traditional, established payment methods are often more difficult to reach. To the benefit of both users and app-developers, the Blockchain payment system will eliminate unfairly high commission charges for micro-payments. Thanks also to the Blockchain, the rating- and incentive-system will be both transparent and secure against manipulation. Real and transparent app ratings generate trust in the system. App successes will be realistically measurable for app-developers and -owners. Last but not least, apps and in-app purchases will be transferable between users, protecting against device-crashes, -theft or -loss. The yappadappadoo Project and App Store are carried out by ITC Information Technology Consultants GmbH, a company registered in Zug, Switzerland. In this whitepaper ITC Information Technology Consultants is referred to in the shortened form ITC.