Providing temporary use of non-downloadable computer software for viewing energy portfolios and reading, assembling, and automatically generating digitally signed and secure audit trails of smart-meter and IoT data; providing temporary use of non-downloadable computer software for tracking the source of energy supply; providing temporary use of non-downloadable computer software for viewing user's sustainability footprint, assessing carbon impact, and automating the REC generation, certification, and retirement process; providing temporary use of non-downloadable computer software featuring virtual submeters to view and account for energy portfolios; providing temporary use of non-downloadable computer software featuring advanced IoT and distributed ledger technologies to prove the authenticity of energy supply for the purpose of automatically delivering a digital audit trail each hour of connectivity; providing temporary use of non-downloadable computer software for use in collecting, storing, managing, and viewing energy supply data in connection with renewable energy certifications; providing temporary use of non-downloadable computer software featuring API-accessible digital assets, namely, for providing energy source and use data that is digitally signed and linked to the blockchain