42 Authentication of data in the field of medical records using blockchain technology; Providing subscription-based temporary use of non-downloadable cloud-based software for receiving, providing, and collecting information regarding prescription drugs, drug therapy, patient medicinal dosage, allergic sensitivity, and prescription history and refills; Providing temporary use of on-line non-downloadable software for accessing, reading, and tracking information in the field of patient medical records on a blockchain; Consulting services in the field of software as a service (SAAS); Software as a service (SAAS) services featuring software for analyzing and reporting self-assessment of illness; Software as a service (SAAS) services featuring software for analyzing and reporting self-assessment of illness for the purpose of infectious disease contact tracing; Software as a service (SAAS) services featuring software for recording and analyzing real-time location data for predicting the spread of an illness in a community