Riot Blockchain (RIOT) S-8 Registration of securities for employees

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 26, 2013, on the financial statements which appears on page 29 of the Annual Report on Form 10-K of Venaxis, Inc. for the year ended December 31, 2012.

/s/ GHP Horwath, P.C.

Denver, Colorado

March 26, 2013