Subject: File No. SR-CboeBZX-2018-040
From: Bryant Eisenbach

July 11, 2018

As a technology worker who entered the cryptocurrency industry without a prior financial background, I can only speak on concerns with the underlying technology.

Any proposal to allow managed trading of digital assets should ensure that the custodian in charge of those digital assets are properly managing them according to industry best practices, which may include regular audits of security practices and a verification of holdings. The final ownership of the asset relies on the knowledge of a secret key, and leaking or loss of this secret key will compromise the asset and render it unrecoverable to the customer.

This industry is still growing rapidly, so these best practices will change dramatically in the coming years, therefore it is important to work with key industry players to inform what these industry "best practices" are.