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by 3np 1860 days ago
Right.

> There's a public ledger

Nothing to do with this.

> we can find out exactly how many people bought it at every price.

None of them afaik will tell you how many people. Trade data tends to be anonymous and only give you price, amount, and side for each trade. There’s no way to differentiate between 2 people trading back and forth 1 million times vs 2 million people trading once each.