Digital Asset Custodian Requirements under MiCA


What's the role of digital asset custodians under MiCA and the specific operational and security requirements they must fulfill.

Executive Summary

In response to the entrepreneurial inquiry regarding digital asset custodians under MiCA, the summary below outlines their key roles and obligations to help facilitate a thorough understanding of the regulatory environment:

  • Definition and Authorization: Custodians are labelled as crypto-asset service providers and must obtain authorization to operate within the EU, affirming a regulated approach to handling crypto-assets.
  • Financial and Operational Stability: They are obliged to maintain financial solvency through minimum capital requirements and implement substantive measures to safeguard client assets, particularly against insolvency risks.
  • Conflict of Interest and Security Measures: Effective policies to manage and disclose conflicts of interest are critical, as well as the maintenance of rigorous security practices to ensure the integrity and confidentiality of the assets.
  • Compliance with Outsourcing and Data Protection: Custodians must carefully manage outsourced services to avoid additional risks and align all personal data processing activities with the standards set by GDPR.

These points concisely articulate the responsibilities of digital asset custodians under MiCA, emphasizing the requirement for strong regulatory compliance and robust asset protection strategies.


  1. The custodians handle diverse types of crypto-assets including, but not limited to, asset-referenced tokens and e-money tokens.
  2. Security requirements will be interpreted to include measures that protect the integrity, availability, and confidentiality of the assets and associated data.
  3. The custodians operate primarily within the EU, making MiCA’s provisions directly applicable to their activities.
  4. Custodial services encompass storage, maintenance, and certain transaction-related administrative duties of crypto-assets.
  5. The custodian in question is a significant market participant, handling a considerable volume of crypto-assets, thereby attracting more rigorous MiCA obligations.

Legal trace

Role and Classification of Digital Asset Custodians in MiCA

’crypto-asset’ means a digital representation of a value or of a right that is able to be transferred and stored electronically using distributed ledger technology or similar technology; Article 3

The foundational assets that custodians handle are defined as crypto-assets. This includes digital representations of value or rights transferrable and storable electronically, and custodians are responsible for safeguarding these assets.

‘crypto-asset service provider’ means a legal person or other undertaking whose occupation or business is the provision of one or more crypto-asset services to clients on a professional basis, and that is allowed to provide crypto-asset services in accordance with Article 59; Article 3

Digital asset custodians are identified as crypto-asset service providers. This categorization requires them to be authorized under MiCA to provide crypto-asset services, thus setting up the regulatory framework within which they must operate.

A person shall not provide crypto-asset services, within the Union, unless that person is a legal person or other undertaking that has been authorised as crypto-asset service provider in accordance with Article 63… Article 59(1)

Custodians must either obtain authorization under Article 63 or be recognized financial entities to legally operate as crypto-asset service providers in the EU. This reinforces the notion of a regulated crypto-asset market where custodians must comply with authorization procedures.

Operational and Prudential Requirements

Crypto-asset service providers shall, at all times, have in place prudential safeguards equal to an amount of at least the higher of the following… Article 67(1)

Custodians are mandated to maintain financial resilience through specific minimum capital requirements or a portion of their fixed overheads. These prudential safeguards help ensure operational stability.

Crypto-asset service providers that hold crypto-assets belonging to clients or the means of access to such crypto-assets shall make adequate arrangements to safeguard the ownership rights of clients… Article 70(1)

Custodians have an explicit duty to protect client assets, particularly in the event of insolvency, to prevent clients’ assets from being misused.

Security Obligations and Conflict of Interest

Crypto-asset service providers shall implement and maintain effective policies and procedures, taking into account the scale, the nature and range of crypto-asset services provided, to identify, prevent, manage and disclose conflicts of interest… Article 72(1)

To maintain security and client trust, custodians must have solid policies to handle conflicts of interest. The systems should be scalable and reviewed regularly for effectiveness.

Outsourcing and Third-party Relationships

Crypto-asset service providers that outsource services or activities to third parties for the performance of operational functions shall take all reasonable steps to avoid additional operational risk. Article 73(1)

Custodians must minimize the risks associated with outsourcing custody functions, maintaining ultimate responsibility and ensuring regulatory oversight is not thwarted by outsourced operations.

On-site Security and Data Protection

Crypto-asset service providers that provide the services referred to in Articles 75 to 79 shall have in place a plan that is appropriate to support an orderly wind-down of their activities… Article 74

Custodians need an established plan for an orderly wind-down of activities, indicating foresight in risk management and the protection of clients’ interests in adverse scenarios.

With regard to the processing of personal data within the framework of this Regulation, competent authorities shall carry out their tasks for the purposes of this Regulation in accordance with Regulation (EU) 2016/679. Article 101, first paragraph

When handling personal data, digital asset custodians’ operations must be structured to comply with both the specific demands of MiCA and the broader requirements of GDPR.

In summary, digital asset custodians under MiCA are responsible for the safekeeping of crypto-assets and maintaining a robust operational framework. This includes financial solvency, transparent governance, risk management, meticulous handling of conflicts of interest, and adherence to strict data protection standards. Custodians must be authorized as crypto-asset service providers and comply with a comprehensive set of security measures to ensure the integrity, availability, and confidentiality of the assets they administer.

PDF Repository

We have searched through the PDF repository of draft EBA and ESMA guidelines, draft technical standards, and other documents to provide this supplemental answer.


In addressing the complexities surrounding the operational and security standards for digital asset custodians under MiCA, we present a supplemental overview enriched with related regulatory insights. This comprehensive addendum aims to fortify your grasp of the regulatory environment, emphasizing specific nuances that directly or indirectly influence the custodial responsibilities within the digital asset domain.

Legal trace

Operational Framework Enhancements from Reporting Obligations

issuers should provide the size of the reserve of assets in a broken-down manner to reflect the value and the composition of the reserve of assets, including liquidity management measures. (Draft) Implementing Technical Standards on the reporting on asset-referenced tokens under Article 22(7) of Regulation (EU) No 2023/1114 (MiCAR) and on e-money tokens denominated in a currency that is not an official currency of a Member State pursuant to Article 58(3) of that Regulation, page 18

This specification underscores the intricate reporting framework digital asset custodians must navigate, detailing the need for transparency in asset reserves’ composition and value. It aligns with the fundamental responsibility of custodians to safeguard assets, highlighting the extent to which reporting mechanisms are integral for operational compliance and security measures.

Governance and Management Suitability

EBA and ESMA have received two joint mandates under MiCA to issue respectively […] guidelines on the assessment of the suitability of the members of the management body of the CASP and of the shareholders or members, whether direct or indirect, that have qualifying holdings in the CASP in accordance with Article 63(11). (Draft) Joint EBA and ESMA Guidelines on suitability assessments of the management body and holders of qualifying holdings under MiCAR, page 7

The emphasis on assessing the suitability of management underlines the direct link between governance and the secure, compliant operation of custodians within MiCA’s framework. It illuminates the broader regulatory lens through which the management’s capabilities and integrity are vetted, ensuring that the operational and security mandates are underpinned by qualified leadership.

Regulatory Landscape and Classification of Crypto-Assets

’crypto-asset’ means a digital representation of a value or of a right that is able to be transferred and stored electronically using distributed ledger technology or similar technology; (Draft) Guidelines on the conditions and criteria for the qualification of crypto-assets as financial instruments, page 19

This foundational definition of a crypto-asset from a regulatory perspective is pivotal for custodians, setting the baseline for what constitutes the assets they are tasked to manage. It directly impacts their operational framework and security protocols, necessitating a robust understanding of the technological and legal nuances defining crypto-assets.

Reporting and Data Protection Amid Crypto-Asset Transactions

The reporting in Article 22(1)(c) and (d) of that Regulation should include transactions between custodial wallets and transactions between a custodial wallet and a non-custodial wallet (Draft) Implementing Technical Standards on the reporting on asset-referenced tokens under Article 22(7) of Regulation (EU) No 2023/1114 (MiCAR) and on e-money tokens denominated in a currency that is not an official currency of a Member State pursuant to Article 58(3) of that Regulation, page 18

This directive for detailed transaction reporting reaffirms the critical role of custodians in ensuring transparent and secure handling of crypto-assets. The delineation between custodial and non-custodial wallet transactions further compounds the operational complexity, underscoring the demanding requirements for data protection and accurate reporting within the custodial domain.

Conclusion and Call to Action for Regulatory Readiness

By digesting these supplementary insights, digital asset custodians can better anticipate and adapt to the demanding operational and security requisites posed by MiCA and associated regulatory texts. This augmented understanding reinforces the call for constant vigilance and adaptability in the rapidly evolving regulatory landscape, ensuring that operational excellence and compliance are continually upheld.