P2P networks are the mechanism used by cryptocurrencies to disseminate system information while keeping the whole system as much decentralized as possible. Cryptocurrency P2P networks have new characteristics that propose new challenges and avoid some problems of existing P2P networks. By characterizing the most relevant cryptocurrency network, Bitcoin, we provide details on different properties of cryptocurrency networks and their similarities and differences with standard P2P network paradigms. Our study allows us to conclude that cryptocurrency networks present a new paradigm of P2P networks due to the mechanisms they use to achieve high resilience and security. With this new paradigm, interesting research lines can be further developed, both in the focused field of P2P cryptocurrency networks and also when such networks are combined with other distributed scenarios.

Healthcare is information driven and knowledge driven. Good healthcare depends on making decisions at the right time and place, using the right patient data and applicable knowledge. Communication is of utmost relevance in today's healthcare settings, in that delivery of care, research, and management all depend on sharing information. The proposed system can securely gather, integrate, and display distributed medical information using mobile-agent technology and agent-driven security