Subject: File No. SR-NYSEArca-2017-139
From: Abe Kohen
Affiliation: AK Financial Engineering Consultants, LLC

December 27, 2017

Talk about a house of cards.

The BitCon ETF will try to replicate BitCon Futures which have some relationship to underlying crypt-o-currencies trading on unregulated exchanges.

And add to that an inverse ETF.

Now mom and pop can lose money going long and short.

(Please excuse the cynicism, but this crypt-o-currency wave needs to be filed away in a crypt.)