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Neither are the original bitcoin. They're block structures are both different. 1MB vs 1MB + SegWit vs 8MB

Or you could say they're both the original Bitcoin - as they both started in 2009 technically.

But I guess BCH is closest to Satoshi's white paper

The original bitcoin had no blocksize limit. Not until version 3

I think there is no problem at all with blockchain size increase.
If you can't come up with a better solution do increase blockchain size, until you can create a better solution.

It's much better than a giant pile of shit like SegWit2x

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