Clearly they are not, yet. The problems are somewhat multi-dimensional
   and the way forward isn't assured. If some counters wanted to scale a
   "Bitcoin-like" chain to handle, on-chain, the average transaction
   volume of PayPal (about 120/sec.), quite a coup, it would require (by
   my reckoning) a block size of about 64 MB. The Bitcoin Unlimited people
   are planning to test blocks much larger. Clearly, this would likely
   result in considerable miner concentration, unless, as Garzik's
   recently announced Bitcoin United (which includes a "our" Escher
   feature) takes over Bitcoin Corey's mantle.

   On Dec 25, 2017 8:21 PM, "James A. Donald" <[1]jamesd@echeque.com>
   wrote:

   On 12/26/2017 12:58 AM, Michalis Kargakis wrote:

     Not a ready implementation yet but the mimblewimble protocol solves
     a lot of the scalability issues plagued in other blockchains.
     [2]https://scalingbitcoin.org/papers/mimblewimble.pdf
     [3]https://github.com/ignopeverell/grin/blob/master/doc/intro.md

     Maybe I am understanding this imperfectly, but this hides how much
     you are paying, and thus how much you have, but does not hide whom
     you pay it to.
     Suppose HHitler create an evil fascist website, and requests
     donations in mimblewimble coins.
     Let us call the public key advertised on that evil fascist website
     HHitler.
     Ann buys mimblewimble coins on an exchange, using US$, and has to
     give her true name and an image of her true face.
     Won't the mimblewimble blockchain show that Ann gave an unknown
     amount to HHitler, whereupon antifa goes around and kills some girl
     whose face superficially resembles that of Ann, and then the judge
     lets them off as well intentioned good guys?
     As the judge recently let off a black man who killed a white man and
     then took his wallet, and subsequently claimed, without racist
     inconvenience of actually needing to produce any evidence, that the
     white man had called him a n****r

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References

   1. mailto:jamesd@echeque.com
   2. https://scalingbitcoin.org/papers/mimblewimble.pdf
   3. https://github.com/ignopeverell/grin/blob/master/doc/intro.md
   4. https://www.avast.com/antivirus