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: April 30, 2018