Distributed, log-based systems... old tech... can do that on fault-tolerant hardware in near real-time with no waste from mining. Necessary crypto accelerators already exist for those, too. Some systems in banking on mainframes or NonStop have been doing transaction processing with decades of uptime despite HW faults and hacker threats.
Compared to blockchains, variations on old approach seem better from the tech efficiency to field results.
Compared to blockchains, variations on old approach seem better from the tech efficiency to field results.