People ask me frequently, “Please tell me, what is blockchain and how does it work?” I have been using various approaches and media answering this question, whiteboards, paper and even beer-coasters, and recently created a single page canvas combining all my scribbles and drawings to answer this question. This works very well, with great response and I like to share it including the story that goes with it. Maybe it is somewhat technical but most people follow the explanation quite well and really feel that they have learned something.
Instead of an user id you get control via keys and signatures, signing transaction-addresses and with that you can prove it is yours. But with that you also have a new/different responsibility being in charge of your keys and related addresses. If you lose them, it is like losing a banknote, anyone can spend it no questions asked.