What is the safest way to demonstrate mining to children?

Use a single demo laptop that you control, with a wallet created only for teaching. Never ask children to enter their own information, install software on their own devices, or touch a real personal wallet. Mine on the demo machine while the children watch the block explorer update on a projector. Any coins earned during the session stay on the demo wallet or go to a community education address. Keep the session under an hour, talk about electricity and effort in plain language, and finish with a short conversation about online scams aimed at kids. Send parents home with a one-page summary so they can continue the conversation. The goal is curiosity and critical thinking, not ownership.