FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Chang Robby Sai Kit
  2. Issuer Name and Ticker or Trading Symbol
Riot Blockchain, Inc. [RIOT]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Financial Officer
(Last)
(First)
(Middle)
C/O RIOT BLOCKCHAIN, INC., 202 6TH STREET, SUITE 401
3. Date of Earliest Transaction (Month/Day/Year)
09/20/2018
(Street)

CASTLE ROCK, CO 80104
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 09/20/2018   M(1)   12,000 (2) A $ 0 (2) 72,000 (3) D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Unit (2) 09/20/2018   M   12,000     (2)   (4) Common Stock 12,000 $ 0 12,000 (5) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Chang Robby Sai Kit
C/O RIOT BLOCKCHAIN, INC.
202 6TH STREET, SUITE 401
CASTLE ROCK, CO 80104
      Chief Financial Officer  

Signatures

 /s/ Robby Sai Kit Change   09/24/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents the 12,000 vested Restricted Stock Units ("RSUs") reported in Column 5 of Table I on page one above, convertible into shares of the Issuer's Common Stock on a one-for-one basis pursuant to the Riot Blockchain, Inc. (f/k/a Bioptix, Inc.) Amended & Restated Equity Incentive Plan (the "Plan").
(2) Represents a restricted stock award granted to the Reporting Person by the Issuer under the Plan at no cost as employment incentive on September 20, 2018, which award vested on the date of grant, subject to the restrictions of the Plan.
(3) Includes an award of 60,000 RSUs granted on February 27, 2018 in connection with the Reporting Person's appointment as Chief Financial Officer, which shall vest in 24 equal monthly installments over a two year period, beginning on the one month anniversary of the date of issuance.
(4) Not applicable.
(5) Represents only the 12,000 RSUs granted on September 20, 2018 and does not include RSUs previously reported.

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