Bitcoin is the real BITCOIN, any others are ALT-COINS or CLONES.
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do more research and hope your brain tickle.
So when you say "real BITCOIN", you mean whatever "Bitcoin" Greg Maxwell and his team of flunkies have allowed to exist?
You're completely blind to the fact that OLD bitcoin just changed irreversibly (Segwit) to support a second-layer solution made by a private corporation (Lightning).
Maybe it's you who should be doing some research. Fanboi.