Malikie Innovations Limited v. Marathon Digital Holdings, Inc.

Case Overview and Background

This litigation pits Malikie Innovations Limited, a non-practicing entity (NPE), against Marathon Digital Holdings, Inc., a major publicly-traded Bitcoin mining company. Malikie, a subsidiary of the Irish NPE Key Patent Innovations, acquired a portfolio of approximately 32,000 patents from BlackBerry in 2023 and has since engaged in a widespread assertion campaign across various technology sectors, including Wi-Fi, 5G, and data synchronization. Marathon Digital operates large-scale cryptocurrency mining facilities, primarily focused on Bitcoin, and was previously known as a patent holding company itself under the name Marathon Patent Group, earning a reputation as a "patent troll." This case is one of at least two similar lawsuits Malikie filed against major Bitcoin miners, the other being against Core Scientific, signaling a significant new front for patent risk in the cryptocurrency industry.

The lawsuit alleges that Marathon's Bitcoin mining operations directly infringe on patents essential to the use of Elliptic Curve Cryptography (ECC), the foundational public-key cryptosystem that secures Bitcoin transactions. The core of the accusation is that Marathon's mining hardware and software, by performing routine operations like generating key pairs and validating digital signatures on the Bitcoin blockchain, practice the methods claimed in the asserted patents. The specific patent at issue, U.S. Patent No. 7,020,281, originally granted to Certicom (a company later acquired by BlackBerry), is described as relating to methods for accelerating digital signature verification and other efficiencies in ECC systems. Malikie's legal filings suggest a broad interpretation of infringement, encompassing nearly any hardware or software that complies with the Bitcoin protocol.

Filed on May 12, 2025, the case (7:25-cv-00222) is proceeding in the U.S. District Court for the Western District of Texas, a venue historically favored by patent plaintiffs. Although once known for Judge Alan Albright's "rocket docket" that attracted a quarter of all U.S. patent cases, a 2022 order mandated random assignment of patent cases filed in the Waco division, somewhat diluting the plaintiff-friendly advantage. The case is notable for its potential industry-wide impact; a successful assertion by Malikie could establish a precedent to demand royalties from a wide range of actors in the Bitcoin ecosystem, from miners to wallet providers, potentially increasing transaction costs and threatening the network's decentralized structure. The litigation highlights a growing trend of established NPEs leveraging large, legacy patent portfolios against emerging technology sectors like cryptocurrency.

Key Legal Developments and Case Status

Note on Asserted Patents: There is a significant discrepancy between the case metadata, which lists only U.S. Patent No. 7,020,281, and court filings. The operative complaint in this litigation, the First Amended Complaint, does not assert the '281 patent. Instead, it asserts a portfolio of six different patents related to cryptographic functions. This analysis proceeds based on the patents identified in official court records.

As of May 5, 2026, the litigation is in its early stages, having recently moved past initial pleadings. Marathon Digital's attempt to achieve an early dismissal has been denied, and the case is proceeding toward discovery and claim construction. There are no parallel PTAB proceedings currently active against the asserted patents.

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Chronological Case Developments

2025-05-12: Complaint Filed
Malikie Innovations Limited ("Malikie") filed its original patent infringement complaint against Marathon Digital Holdings, Inc. ("Marathon") in the U.S. District Court for the Western District of Texas (Case No. 7:25-cv-00222). The initial complaint asserted six patents, alleging that Marathon's Bitcoin mining hardware and software, which comply with the Bitcoin protocol, infringe claims related to elliptic curve cryptography (ECC).

2025-07-25: First Amended Complaint (FAC)
In response to an initial motion to dismiss from Marathon that targeted one of the originally asserted patents (U.S. Patent No. 8,532,286), Malikie filed a First Amended Complaint (Dkt. 36). The FAC became the operative complaint and asserts infringement of the following six patents:

• U.S. Patent No. 8,788,827: "Accelerated verification of digital signatures and public keys"
• U.S. Patent No. 10,284,370: "System and method for providing ephemeral-static Diffie-Hellman"
• U.S. Patent No. 8,666,062: "Method and apparatus for performing finite field calculations"
• U.S. Patent No. 7,372,960: "Multiple signature verification"
• U.S. Patent No. 7,372,961: "System and method for elliptic curve cryptography"
• U.S. Patent No. 8,532,286: "System and method for reducing the computation and storage requirements for a Montgomery-style reduction"

2025-09-08: Marathon's Renewed Motion to Dismiss
Marathon filed a Renewed Motion to Dismiss under Rule 12(b)(6) (Dkt. 38), again targeting the infringement claim related to the '286 patent. Marathon argued that Malikie's allegations were implausible because the technical workings of the accused products, based on publicly available source code, could not meet a specific "Reduction Value Limitation" required by the patent's claims.

2026-03-10: Court Denies Motion to Dismiss
Judge David Counts issued an order denying Marathon's motion to dismiss (Dkt. 78). The court found that Marathon's arguments improperly required a deep dive into claim construction and technical analysis of source code, which are matters reserved for later stages of litigation, such as claim construction hearings and discovery with expert testimony. The court concluded that delving into the patent's prosecution history and the "point of novelty" to decide a motion to dismiss was inappropriate. This ruling was a significant early victory for Malikie, allowing the case to proceed on all asserted patents.

Post-March 2026: Answer and Scheduling (Anticipated)
Following the denial of its motion to dismiss, Marathon was required to file an Answer to the First Amended Complaint. As of early May 2026, the docket indicates the case is active, but the specific Answer and a comprehensive scheduling order setting dates for a Markman hearing, discovery deadlines, and trial have not yet been made publicly available. It is presumed that the parties are currently engaged in discovery and negotiating a case schedule with the court.

Parallel PTAB Proceedings

As of May 5, 2026, a search of the USPTO's Patent Trial and Appeal Board (PTAB) database reveals that no Inter Partes Review (IPR) or other post-grant proceedings have been filed by Marathon or any other party against the six patents asserted in the First Amended Complaint.

However, there are clear indications that validity challenges are being prepared by industry groups. On April 28, 2026, Unified Patents, a member-based organization that challenges patents asserted by non-practicing entities, announced it had awarded $4,000 in prize money for a crowdsourced prior art search contest targeting Malikie's cryptographic patents. The announcement explicitly mentioned U.S. Patent No. 8,666,062 (asserted against Marathon) and, notably, U.S. Patent No. 7,020,281 (the patent from the case metadata) as subjects of the search. This action suggests that entities in the cryptocurrency and technology sectors are actively gathering evidence to challenge the validity of Malikie's portfolio at the PTAB, even though no formal petitions have been filed yet.

Outcome and Current Posture

The case is ongoing and in the early-to-mid stages of pre-trial proceedings. Malikie has successfully defended its complaint against Marathon's attempt at an early dismissal. The key upcoming milestones will be the filing of Marathon's Answer and counterclaims, followed by the entry of a scheduling order, which will govern the discovery and claim construction phases of the litigation. No settlement has been announced. The lack of active PTAB challenges means the district court case is currently the sole venue for this dispute and is not stayed.

Plaintiff's Counsel of Record

Malikie Innovations Limited has retained a combination of nationally recognized patent trial lawyers from Reichman Jorgensen Lehman & Feldberg LLP and experienced local counsel from Cherry Johnson Siegmund James PLLC to represent it in its infringement suit against Marathon Digital Holdings.

Reichman Jorgensen Lehman & Feldberg LLP

This national trial boutique, known for handling high-stakes intellectual property disputes, serves as lead counsel for Malikie. The firm is noted for its majority women-owned status and its use of fee arrangements that avoid the traditional billable hour model.

• Khue V. Hoang (Lead Counsel)

  • Firm & Location: Reichman Jorgensen Lehman & Feldberg LLP, New York, NY.
  • Experience Note: A former semiconductor engineer, Hoang is the Managing Partner of the firm's New York office and has over 20 years of experience, including securing a $236 million patent infringement verdict for Densify against VMware.

• Matthew G. Berkowitz (Lead Counsel)

  • Firm & Location: Reichman Jorgensen Lehman & Feldberg LLP, Silicon Valley (Redwood City, CA).
  • Experience Note: A Chambers-ranked patent litigator who has acted as lead counsel in over 20 district court and post-grant proceedings across technologies including software, networking, and consumer electronics.

• Philip J. Eklem (Lead Counsel)

  • Firm & Location: Reichman Jorgensen Lehman & Feldberg LLP, Washington, D.C.
  • Experience Note: A former USPTO patent examiner and project engineer at Mercedes-Benz, Eklem's practice focuses on patent litigation involving technologies such as blockchain, cryptocurrencies, and cloud storage systems.

Cherry Johnson Siegmund James PLLC

This Waco-based firm provides local counsel, a critical role in the Western District of Texas.

• Mark D. Siegmund (Local Counsel)
  • Firm & Location: Cherry Johnson Siegmund James, PLLC, Waco, TX.
  • Experience Note: Siegmund formerly clerked for Judge Alan D. Albright of the Western District of Texas, giving him unique insight into the practices and procedures of the court where this case was filed.

As of early 2026, Marathon Digital Holdings, Inc. has retained a team of nationally recognized patent litigators from Paul, Weiss, Rifkind, Wharton & Garrison LLP as lead counsel, supported by experienced local counsel from the Texas-based firm Scott Douglass & McConnico LLP.

Lead Counsel

Firm: Paul, Weiss, Rifkind, Wharton & Garrison LLP

The primary defense team is comprised of attorneys from Paul, Weiss, a firm known for handling high-stakes litigation. However, a significant recent development is that two of the lead attorneys departed the firm in March 2026. Their continued role on this specific case post-transition has not been confirmed in public records.

• Priyata Patel

  • Role: Lead Counsel
  • Firm & Office: Dechert LLP, Washington, D.C. (Formerly Paul, Weiss as of March 2026)
  • Noteable Experience: Represents clients in complex patent disputes before U.S. district courts and the ITC, specializing in medical device and pharmaceutical technologies.

• Anish R. Desai

  • Role: Lead Counsel
  • Firm & Office: Dechert LLP, New York (Formerly Paul, Weiss as of March 2026)
  • Noteable Experience: A first-chair trial lawyer with extensive experience in over 100 inter partes review (IPR) proceedings and competitor disputes involving technology and life sciences.

• Christopher Pepe

  • Role: Of Counsel
  • Firm & Office: Paul, Weiss; Washington, D.C.
  • Noteable Experience: A partner in Paul, Weiss's patent litigation practice who handles matters in federal district court, the ITC, and at the PTAB.

• Ian A. Moore

  • Role: Of Counsel
  • Firm & Office: Paul, Weiss; New York, NY
  • Noteable Experience: Focuses on patent disputes related to software and electronics, with case experience involving autonomous vehicles, robotic surgical systems, and 3GPP standards.

• Eric C. Westerhold

  • Role: Of Counsel
  • Firm & Office: Paul, Weiss; Washington, D.C.
  • Noteable Experience: Litigation counsel at the firm who is listed on publications regarding USPTO and patent litigation matters.

• Thomas Macchio

  • Role: Of Counsel
  • Firm & Office: Paul, Weiss; New York, NY
  • Noteable Experience: An intellectual property associate with a background in mechanical engineering.

Local Counsel

Firm: Scott Douglass & McConnico LLP

This Austin-based firm is well-known for its trial practice in Texas, including significant experience in the Western District, the venue for this case.

• Steven J. Wingard

  • Role: Local Counsel
  • Firm & Office: Scott Douglass & McConnico LLP; Austin, TX
  • Noteable Experience: Represents clients in patent, copyright, and trade secret litigation, and has defended major companies like The Walt Disney Company and Medtronic in the Western District of Texas.

• Stephen Burbank

  • Role: Local Counsel
  • Firm & Office: Scott Douglass & McConnico LLP; Austin, TX
  • Noteable Experience: A former judicial law clerk for Judge Alan D. Albright, giving him direct experience with the court where this case was filed and is frequently heard.

• Robert Pierce "Robby" Earle

  • Role: Local Counsel
  • Firm & Office: Scott Douglass & McConnico LLP; Austin, TX
  • Noteable Experience: Also a former law clerk for Judge Alan D. Albright of the Western District of Texas, specializing in intellectual property litigation and trial presentation.