As an example: https://www.statista.com/statistics/881541/bitcoin-energy-consumption-transaction-comparison-visa/ https://www.statista.com/statistics/881541/bit

As an example: https://www.statista.com/statistics/881541/bitcoin-energy-consumption-transaction-comparison-visa/ https://www.statista.com/statistics/881541/bitcoin-energy-co... I'm sure modern, all digital, methods like Venmo or PayPal use even less.