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Dodgecoin and ethereum goes up then down by 5% almost every 48-hour period. Meaning somebody is buying large amounts when the price is low, which raises the global price by decreasing supply, and then they sell it for a profit. Then the price goes back down since there is more supply, so they can buy large amounts again. They keep repeating this process to make free money.

Coinbase can give notifications of price changes to your email, and this rigged crypto pricing has been happening for months.

But can it be proven?