For a year, Ethereum was just the spicier way to bet on Bitcoin. Same trade, bigger swings. You held it on top of your Bitcoin, and the two moved together closely enough to treat as one thing.

This week that stopped being true.

The ETF money drifting back into Bitcoin did something new. It showed up for Ethereum at the same size. Over the last seven trading days the Ethereum funds took in about $269 million, six of seven days positive, against $98 million the week before. That clears the line we use to separate real institutional buying from noise, for the first time this cycle. Bitcoin's own seven-day run, close to a billion dollars, is real too. For the first time both majors are over that line at once.

Good news for both. Then the crowd did something that does not fit the one-trade story.

It started pricing the two apart. Two long-running bets run side by side: that Bitcoin dips to $55,000 before year-end, and that Ethereum dips to $1,500. For weeks they sat locked together near 46 percent, then split. The Bitcoin-dip bet held around 47 percent; the Ethereum-dip bet fell to 42 percent, the biggest one-week move on the crypto board. Real money is now betting Bitcoin has further to fall than Ethereum. For something sold as Bitcoin with extra kick, that is backwards.

Which engine is under your coins matters more now than where the price sits, because for the first time each is being bought by a different crowd.