By using traditional finance combined with modern electronic payment processing (credit card) ledger models and not actually doing micropayments. I'd do micro a

By using traditional finance combined with modern electronic payment processing (credit card) ledger models and not actually doing micropayments. I'd do micro accumulation and only ever pay out once a threshold is reached. Many credit cards rewards programs do just this. You accumulate points when you spend, where a single point may be a fraction of a penny, and you can only claim the cash-back reward with a minimum of X-hundred or -thousand so points. It's just too inefficient to actually pay out extremely small sums in a single transaction. Blockchain doesn't solve this - you'd still burn more fuel than it's worth.