SEC: Special Purpose Broker-Dealers May Custody Digital Assets

Effective April 27, 2021, the SEC issued a statement on the Custody of Digital Asset Securities by Special Purpose Broker-Dealers and outlined the steps broker-dealers of digital asset securities must take to comply with a safe harbor available for the next five years1. Per the Statement, a broker-dealer operating under certain circumstances will not be subject to a Commission enforcement action for violation of SEC Rule 15c3-3(b)(1).


A major question facing brokers and dealers seeking to conduct transactions of digital asset securities is how to comply with customer protection rules provided under the Securities Exchange Act of 1934 (the “Exchange Act”). The Customer Protection Rule, SEC Rule 15c3-3(b)(1), generally requires a broker-dealer to maintain the physical possession or control of all fully paid securities and excess margin securities carried or received by the broker-dealer for the account of customers. The language prompts the question of how a broker-dealer of digital securities, which have no physical component, can demonstrate possession and control of such assets received and held in custody for customers.

Special Purpose Broker-Dealer Exemption

The Statement issued by the SEC acknowledges the difficulty in proving a broker-dealer exercises “control” over digital securities compared to traditional securities and provides a time-limited exemption for special purpose broker dealers who meet certain requirements. Previously, the SEC provided guidance permitting broker-dealers to transact in digital asset securities but only when providing noncustodial services. As a result of this new exemption, for five years following the publication of the Statement, a broker-dealer will not be subject to an enforcement action for violation of the Customer Protection Rule if the broker dealer:
  1. has access to the digital asset securities and the capability to transfer them on the associated distributed ledger technology;
  2. limits its business to dealing in, effecting transactions in, maintaining custody of, and/or operating an alternative trading system for digital asset securities;
  3. establishes, maintains, and enforces reasonably designed written policies and procedures covering a range of issues, including the following:
    1. Determine Whether a Digital Asset is a Security – a broker must conduct and document an analysis of whether a digital asset is a security offered and sold pursuant to an effective registration statement or an available exemption from registration, and whether the broker-dealer has fulfilled its requirements to comply with the federal securities laws with respect to effecting transactions in that digital asset security before undertaking to effect transactions in and maintain custody of such asset. Such policies and procedures should provide a reasonable level of assurance that any digital assets transacted in or held in custody by the broker-dealer are in fact digital asset securities.
    2. Conduct Network Due Diligence – a broker-dealer must conduct and document an assessment of the characteristics of a digital asset security’s distributed ledger technology and associated network prior to undertaking to maintain custody of the digital asset security and at reasonable intervals thereafter.
    3. Demonstrate Exclusive Control and Possession – a broker-dealer must implement policies for safekeeping and demonstrating the broker-dealer has exclusive possession or control over digital asset securities that are consistent with industry best practices to protect against the theft, loss, and unauthorized and accidental use of the private keys necessary to access and transfer the digital asset securities the broker-dealer holds in custody.
    4. Develop Specific Event Responses. A broker-dealer must develop procedures to address specific events, including: (1) specifically identify, in advance, the steps it intends to take in the wake of certain events that could affect the firm’s custody of the digital asset securities, including blockchain malfunctions, 51% attacks, hard forks, or airdrops: (2) allow the broker-dealer to comply with a court-ordered freeze or seizure: and (3) allow the transfer of the digital asset securities held by the broker-dealer to another special purpose broker-dealer, a trustee, receiver, liquidator, a person performing a similar function, or another appropriate person, in the event the broker-dealer can no longer continue as a going concern and self-liquidates or is subject to a formal bankruptcy, receivership, liquidation, or similar proceeding.
  4. does not maintain custody of a digital asset security if the firm is aware of any material security or operational problems or weaknesses with the distributed ledger technology and associated network used to access and transfer the digital asset security, or is aware of other material risks posed to the broker-dealer’s business by the digital asset security;
  5. establishes, maintains, and enforces reasonably designed written policies, procedures, and controls that are consistent with industry best practices to demonstrate the broker-dealer has exclusive control over the digital asset securities it holds in custody and to protect against the theft, loss, and unauthorized and accidental use of the private
  6. Provide written disclosures to prospective customers about the risks of investing in or holding digital asset securities.
    • Anchorage Comments: BDs should provide
      1. Written disclosures that it is deemed to be in possession or control of Digital Asset Securities held for the customer for purposes of SEC Rule 15c3-3(b)(1) based on its compliance with the Statement;
      2. written disclosures about the risks of investing in or holding digital securities that: a. prominently disclose that digital securities may not be “securities” as defined in SIPA — and in particular, Digital Asset Securities that are “investment contracts” under the Howey test but are not registered with the SEC are excluded from SIPA’s definition of “securities” — and thus the protections afforded to securities customers under SIPA may not apply; b. describe the risks of fraud, manipulation, theft, and loss associated with Digital Asset Securities; c. describe the risks relating to valuation, price volatility, and liquidity associated with Digital Asset Securities; d. describe, at a high level that would not compromise any security protocols, the processes, software and hardware systems, and any other formats or systems used to create, store, or use the private keys and protect them from loss, theft, or unauthorized or accidental use; e. a set of risks relevant to any specific digital asset; and f. any additional risks that arise over time related to the industry at large or the protocol at issue; and
      3. any unique risks specific to the applicable protocol or smart contract.
  7. provides written disclosures to prospective customers: (i) that the firm is deeming itself to be in possession or control of digital asset securities held for the customer for the purposes of paragraph (b)(1) of Rule 15c3-3 based on its compliance with this Commission position; and (ii) about the risks of investing in or holding digital asset securities; and
  8. enters into a written agreement with each customer that sets forth the terms and conditions with respect to receiving, purchasing, holding, safekeeping, selling, transferring, exchanging, custodying, liquidating, and otherwise transacting in digital asset securities on behalf of the customer.


The Statement creates a safe harbor for a “special purpose broker-dealer” provided the business exclusively to deals in, effects transactions in, maintains custody of and/or operates an alternative trading system for digital asset securities. As such, existing broker-dealers cannot add digital asset activities to a broker-dealer license and must apply for a new license for an entity that will only conduct digital asset activities. The Commission requested comments on specific topics relevant to digital asset securities and blockchain technology. In response, various industry participants provided feedback with respect to protection against theft and loss of digital asset securities, and events that could affect a broker-dealer’s custody of digital asset securities. Overall, the Statement received a lukewarm welcome with many industry participants commenting on the need for additional clarity regarding certain requirements and the rejecting the idea that a single purpose broker is needed to ensure customer protection in digital securities brokerage transactions. Comments have also challenged the necessity and practicality of certain procedures and disclosures, questioning:
  • whether it is practical to require BDs to determine whether a digital asset is a security, because (1) all digital asset securities are “intended” securities issued by issuers pursuant to federal securities laws; (2) no clear guidance exists on how to make such determination;
  • whether BDs may rely on network due diligence provided by third-parties or must conduct its own due diligence;
  • whether the requirement that BDs demonstrate industry best practices implemented to protect against loss or theft of digital assets or private keys can be met; and
  • whether digital asset securities require additional disclosures because they are in fact riskier than traditional securities.

The special purpose BD exemption is a significant step towards creating a regulatory environment for digital asset securities that acknowledges the innovative features of blockchain technology as applied to private securities while purporting to safeguard consumers from the unique risks that do not exist with respect to traditional securities. In doing so, the SEC’s five-year incubator period requires broker-dealers to silo traditional securities brokerage activities from digital asset securities activities, which will undoubtedly prevent smaller firms from participating in both types of transactions. Moreover, many questions remain as to the best practices for protecting against theft, loss and fraud with respect to private keys held by special purpose broker dealers. The Statement includes a request for comment on these and other issues.

The attorneys at Bull Blockchain Law are closely tracking developments with respect to special purpose broker-dealers and the comments submitted by industry participants. If you have any questions about becoming a special purpose broker-dealer, contact Tyler Harttraft, Esq. at

1 Custody of Digital Asset Securities by Special Purpose Broker-Dealers, SEC Release No. 34-90788 at 4 (Dec. 23, 2020) (SEC Release No. 34-90788). The Statement will become effective 60 days after publication in the Federal Register. As of the date of this Client Alert, the Statement has not been published.

Related Articles



About Bull Blockchain Law

As lawyers, technologists, and entrepreneurs, the firm’s partners began their journey in the crypto industry by building and operating cryptocurrency mining machines and a private digital asset investment fund. They quickly realized that the industry was woefully underserved by legal professionals who grasped the impact blockchain technology would eventually have on the world. Bull Blockchain Law LLP was founded to support the growth of a new breed of technology. Today, the firm serves as counsel to clients of all sizes and an advocate for sound public policy. It remains one of the few law firms completely focused on the crypto industry.