I really don't understand why people (and media as well) keep saying that BTC reached a new ATH. According to CoinMarketCap, BTC's ATH was at
20.089$ and this event happened on December 17th, 2017.
What happened recently, on December 1st, was BTC reaching a value very cloae to its ATH, but not a new ATH.
I am not sure what happened exactly on that day (even I was in the market) and why coinmarketcap gives us the 2017 all time high at $20.089. I recalled I have never seen bitcoin broke $20,000 in 2017. Double check with price charts on Trading view, it seems data from CMC is wrong on 2017 All time high or it could be a price from a leverage exchange like BitMEX or Bitfinex.
You are right about that price from CMC (I used their price table for my analysis so I knew it).
I checked 2017 all time high:
- Bitfinex: $19,891
- BitMEX: $20,093 (not $20,086)

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Am very optimistic that bitcoin is going to go beyond the ATH of 2017 which was a little above $20k I think before this year come to an end bitcoin is going beyond $25k and at that it may likely surpass that in January before dropping again, bitcoin is going to make positive movement this period and really excited about this event.