Exhibit 31.1
CERTIFICATION
 
 
I, John O'Rourke, certify that:
 
1. I have reviewed this Annual Report on Form 10-K/A of Riot Blockchain, Inc.;
 
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
 
 
 
 
/s/ John O'Rourke
 
John O'Rourke, Chief Executive Officer
PRINCIPAL EXECUTIVE OFFICER


Date:  June 29, 2018