9 Downloadable and recorded content (computer programs, data and information) for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction; electronic databases in the field of blockchain technology and banking services using blockchain technology recorded on computer media; downloadable application software for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction; computer software platforms recorded and downloadable for computer and mobile application development, namely, for simplifying blockchain-based applications (software) development; downloadable computer programmes for data processing; downloadable computer software for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction; downloadable computer software and applications for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction for mobile devices; application development software for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction; computer software for use as an application programming interface (API) for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction; software development kit [SDK] for interaction with blockchain protocols, reading, updating and writing into blockchain protocols, key management system for simplifying blockchain-based applications (software) development, accessing blockchain infrastructure and for using as an interface for blockchain interaction