Sometimes we see When the BTC High then Alts move slightly. So, what's the correlation of Alts with BTC?
If the Bitcoin chart turns green, then Alt also turns green. And it has a very correlation relationship with Alt. We know the owners of the Alt project have Bitcoin reserves to pump their coins at any time.
Apart from that, the Alt to BTC sell order will also bring changes to the chart.
For example ETH/BTC if the Bitcoin price increases and the chart turns green, the ETH chart will automatically turn green, even though the order value remains the same.