April 24, 2017

Marathon Patent Group, Inc.

11100 Santa Monica Blvd., Ste. 380

Los Angeles, CA 90025

Re: Marathon Patent Group, Inc. Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel for Marathon Patent Group, Inc., a Nevada corporation (the “Company”), in connection with the preparation and filing of a Registration Statement on Form S-3 (File No. 333-198569) (the “Registration Statement”) with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations promulgated thereunder, which was declared effective by the Commission on January 6, 2015, the prospectus included therein (the “Prospectus”) and the prospectus supplement, dated April 19, 2017 (the “Prospectus Supplement”), filed with the Commission pursuant to Rule 424(b) of the rules and regulations of the Securities Act.

The Prospectus Supplement pertains to an offering (the “Offering”) pursuant to the Securities Purchase Agreement, dated April 18, 2017, between the Company and the purchasers identified on the signature pages thereto (the “Purchase Agreement”) and relates to the issuance and sale by the Company of 3,800,000 shares of common stock (the “Shares”), par value $0.0001 per share.

We understand that the Shares are to be sold, as described in the Registration Statement, the Prospectus and the Prospectus Supplement, pursuant to the Purchase Agreement filed as Exhibit 10.1 to the Current Report on Form 8-K to which this opinion is attached as Exhibit 5.1.

In connection with this opinion, we have examined the Registration Statement, the Prospectus and the Prospectus Supplement.  We also have examined such corporate records, certificates and other documents and such questions of law as we have considered necessary or appropriate for the purpose of this opinion. We have assumed: (A) the genuineness and authenticity of all documents submitted to us as originals and (B) the conformity to originals of all documents submitted to us as copies thereof.  As to certain factual matters, we have relied upon certificates of officers of the Company and have not sought independently to verify such matters.

Without limiting any of the other limitations, exceptions and qualifications stated elsewhere herein, we express no opinion with regard to the applicability or effect of the laws of any jurisdiction other than the Chapter 78 of the Nevada Revised Statutes (based solely upon our review of a standard compilation thereof) as in effect as of the date hereof. This opinion letter deals only with the specified legal issues expressly addressed herein, and you should not infer any opinion that is not explicitly stated herein from any matter addressed in this opinion letter.

Based on the foregoing, and subject to the assumptions, limitations and qualifications set forth herein, we are of the opinion that the issuance and sale of the Shares has been duly authorized and, when issued and sold in the manner described in the Registration Statement, the Prospectus and the Prospectus Supplement and in accordance with the terms and conditions of the Purchase Agreement, the Shares will be validly issued, fully paid and non-assessable.

We hereby consent to the inclusion of this opinion as an exhibit to the Registration Statement and to the references to our firm therein and in the Prospectus and the Prospectus Supplement under the caption “Legal Matters.”  In giving our consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations thereunder.

Very truly yours,

/s/ Sichenzia Ross Ference Kesner LLP