How do you make a digital thing scarce?

Cost goes in the object, not in a door.

For most of human history the problem was that things were scarce, and the effort to make more largely worked.

Digital things arrived already solved. A file, a message, an account, a key — the millionth is indistinguishable in cost from the first. That is the greatest abundance ever achieved, and it should be celebrated. Some things need to be scarce in order to mean anything, and nothing digital is scarce by nature.

A cryptographic key shows why. A moment of arithmetic and you have one. Make ten million. The last one is no more expensive than the first. That is not a flaw. It is what makes modern cryptography work. It also says nothing about how many secrets the same someone controls. Ten thousand keys arriving at a service look exactly like ten thousand participants, and nothing in the mathematics distinguishes that from one person and a laptop that never got warm.

So systems build a door and put someone behind it. Prove you are human. Squint at a grainy tile. The bot farm absorbs friction as overhead. The person who wanted to read an article encounters the puzzle and leaves. The system now has a gatekeeper: an organisation that must keep existing, and a policy that can quietly change. The openness that was the reason for building it has been traded away to protect it.

The remaining question is not how to keep the wrong people out. It is how to make the thing itself expensive to produce.

Not expensive to buy. Nobody is paid. Expensive to make: real work, performed and finished, with the evidence of it carried in the result. Build a second thing beside it: an object tying that key to a production event that was expensive. The key stays free. The object is paid for.

Friction at a door falls on whoever turns up most honestly. Cost inside the object falls on whoever wanted the object, in proportion to how many they wanted.

A thing is being examined, and it either cost what it claims or it did not. Removing a free account costs the other party nothing. A new one exists before the page reloads. Removing a made object throws the making away. Why the holder would still be carrying that file is Why carry the cost forward?

A cost that divides across a batch, an object that can only be checked by asking whoever issued it, or work whose place in public time nobody can pin down: each of those has an answer elsewhere on this shelf. The difference between a thing that was made and a thing that was listed or handed out is Issued, listed, or made?

Someone can hold many, and they pay for each. Checking establishes a fact about the object. Whether that fact is enough is Why is the check always cheaper than the making?

It is a way of making a digital thing that could not have been cheap, so that pretending to be a crowd stops being the cheapest thing in the room.