The price of 1 bitcoin in inflation-adjusted USD, starting from Jan 3rd 2009. All price adjustments are based on the current purchasing power of the dollar according to the consumer price index, and comparing to 2009 on the day the genesis block was mined.
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When BTC and BTC.D are correlated, alts aren't mimicking bitcoin's price action with bigger amplitudes (in % terms). It suggests more fundamental demand for BTC and less manipulation/speculation.
It looks as though alts (on average) are starting to ride bitcoin's price action again, as BTC and BTC.D are seemingly back to moving inversely.