Meanwhile larger networks become increasingly inefficient because without trust all transactions have to be checked and rechecked and rechecked and rechecked. B

Meanwhile larger networks become increasingly inefficient because without trust all transactions have to be checked and rechecked and rechecked and rechecked. But fear not, $magical_solution is around the corner and will resolve all of this! It's been coming for 5 years now, so you know it's due any minute now.