FORM OF CASH CUSTODY AGREEMENT By and Between THE BANK OF NEW YORK MELLON And ARK 21SHARES BITCOIN ETF

Exhibit 10.10

FORM OF CASH CUSTODY AGREEMENT

By and Between

THE BANK OF NEW YORK MELLON

And

ARK 21SHARES BITCOIN ETF

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CUSTODY AGREEMENT

This Custody Agreement is made and entered into as of the latest date set forth on the signature page hereto (the “Effective Date”) by and between THE BANK OF NEW YORK MELLON, a New York state chartered bank (“BNY Mellon”), and ARK 21SHARES BITCOIN ETF, a Delaware statutory trust (“Customer”), by 21Shares US LLC, the Sponsor to the Customer. BNY Mellon and Customer are collectively referred to as the “Parties” and individually as a “Party”.

RECITALS

WHEREAS, Customer wishes to appoint BNY Mellon as the custodian of certain of its assets, and BNY Mellon is willing to provide such services on the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the mutual covenants and agreements set forth herein, and intending to be legally bound, the Parties agree as follows.

Whenever used in this Agreement, the following words have the meanings set forth below:

“Account” or “Accounts” has the meaning set forth in Section 2.2.

“Affiliate” means, with respect to any entity, any other entity that directly or indirectly controls, is controlled by or under common control with such entity.

“Agreement” means, collectively, this Custody Agreement, any Exhibits hereto and any other documents incorporated herein by reference.

“Anti-Money Laundering Laws” means all applicable anti-money laundering and counter-terrorist financing laws, rules, regulations, executive orders and requirements administered by any governmental authority of the United States (including the U.S. Bank Secrecy Act, the U.S.A. PATRIOT Act, and regulations of the U.S. Treasury Department which implement such acts) or any other applicable domestic or foreign authority with jurisdiction over Customer.

“Assets” has the meaning set forth in Section 2.1(a).

“Authorized Person” has the meaning set forth in Section 3.1.

“BNY Mellon” has the meaning set forth in the introductory paragraph.

“Cash” means the money and currency of any jurisdiction which BNY Mellon accepts for deposit in an Account.

“Confidential Information” means, with respect to a Party, the terms of this Agreement and all non-public business and financial information of such Party (including, with respect to Customer, information regarding the Accounts and including, with respect to BNY Mellon, information regarding its practices and procedures related to the services provided hereunder) disclosed to the other Party in connection with this Agreement.

“Customer” has the meaning set forth in the introductory paragraph.

“Data Terms Website” means ▇▇▇▇://▇▇▇.▇▇▇▇▇▇▇▇▇.▇▇▇/▇▇▇▇▇▇▇▇/▇▇▇▇▇▇▇▇▇▇▇▇▇▇/▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇ or any successor website the address of which is provided by BNY Mellon to Customer.

“Effective Date” has the meaning set forth in the introductory paragraph.

“Electronic Access Services” means such services made available by BNY Mellon or a BNY Mellon Affiliate to Customer to electronically access information relating to the Accounts and/or transmit Instructions.

“Instructions” means, with respect to this Agreement, instructions issued to BNY Mellon by way of (a) one of the following methods (each as and to the extent specified by BNY Mellon as available for use in connection with the services hereunder): (i) the Electronic Access Services; (ii) third-party electronic communication services containing, where applicable, appropriate authorization codes, passwords or authentication keys, or otherwise appearing on their face to have been transmitted by an Authorized Person or (iii) third-party institutional trade matching utilities used to effect transactions in accordance with such utility’s customary procedures or (b) such other method as may be agreed upon by the Parties and that appear on their face to have been transmitted by an Authorized Person.

“Market Data” means pricing, valuations or other commercially sourced data applicable to any security. Market Data also includes security identifiers, bond ratings and classification data.

“Market Data Providers” means vendors and analytics providers and any other Person providing Market Data to BNY Mellon.

“Oral Instructions” means, with respect to this Agreement, spoken instructions issued to BNY Mellon and reasonably believed by BNY Mellon to be from an Authorized Person.

“Party” or “Parties” has the meaning set forth in the introductory paragraph. “Person” or “Persons” means any entity or individual.

“Sanctions” means all economic sanctions laws, rules, regulations, executive orders and requirements administered by any governmental authority of the United States (including the Office of Foreign Assets Control (OFAC) of the U.S. Department of the Treasury) or any other applicable domestic or foreign authority with jurisdiction over Customer.

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“Series” means the respective portfolios, if any, of Customer listed on Appendix I to this Agreement. If no portfolios are listed on Appendix I to this Agreement then a reference to a Series means Customer.

“Standard of Care” has the meaning set forth in Section 12.1.

“Tax Obligations” means taxes, withholding, certification and reporting requirements, claims for exemptions or refund, interest, penalties, additions to tax and other related expenses.

“Third Party Data” has the meaning set forth in Section 7.3(a).

BNY Mellon will establish and maintain a separate account for each Series in which BNY Mellon will hold Assets relating to the relevant Series as provided herein (each, an “Account,” and collectively, the “Accounts”). The Account of each Series established under this Agreement shall be maintained separately from the Account of each other Series.

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Promptly following the Effective Date, Customer and/or its designee (including any of Customer’s investment managers) will furnish BNY Mellon with one or more written lists or other documentation acceptable to BNY Mellon specifying the names and titles of, or otherwise identifying, all Persons authorized to act on behalf of Customer (with respect to a particular Series, if applicable) with respect to this Agreement (each, an “Authorized Person”). Customer will be responsible for keeping such lists and/or other documentation current, and will update such lists and/or other documentation, as necessary from time to time, pursuant to Instructions.

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Notwithstanding anything to the contrary set forth in this Agreement, Customer hereby authorizes BNY Mellon, without Instructions, to take any administrative or ministerial actions with respect to the Accounts that it deems reasonably necessary or appropriate to perform its obligations under this Agreement, including the following:

With respect to each Instruction for a Cash transfer, when the Instruction is to credit or pay a party by both a name and a unique numeric or alpha-numeric identifier (e.g., IBAN or ABA or account number), BNY Mellon and any other bank participating in the Cash transfer will be entitled to rely solely on such numeric or alpha-numeric identifier, even if it identifies a party different from the party named. Such reliance on an identifier will apply to beneficiaries named in the Instruction, as well as any financial institution that is designated in the Instruction to act as an intermediary in such Cash transfer. To the extent permitted by applicable law, the Parties will be bound by the rules of any transfer system used to effect a Cash transfer under this Agreement.

If Customer elects to use the Electronic Access Services in connection with this Agreement, the use thereof will be subject to any terms and conditions contained in a separate written agreement between the Parties or their Affiliates. If an Authorized Person elects, with BNY Mellon’s prior consent, to transmit Instructions through a third-party electronic communications service, BNY Mellon will not be responsible or liable for the reliability or availability of any such service.

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BNY Mellon may appoint agents, including BNY Mellon Affiliates, on such terms and conditions as it deems appropriate to perform its obligations hereunder. Except as otherwise specifically provided herein, no such appointment will discharge BNY Mellon from its obligations hereunder.

Customer will be responsible and liable for all Tax Obligations with respect to any Assets held on behalf of Customer and any transaction related thereto. Customer acknowledges and agrees that BNY Mellon and its Affiliates are not tax advisers and will not under any circumstances provide tax advice to Customer. Customer will obtain its own independent tax advice for any tax-related matters.

Where BNY Mellon receives Instructions to make distributions or transfers out of an Account in order to pay Customer’s third party service providers, Customer acknowledges that in making such payments BNY Mellon is acting in an administrative or ministerial capacity, and not as the payor, for tax information reporting and withholding purposes.

If BNY Mellon receives an Instruction that, if processed, would result in an overdraft in an Account, BNY Mellon may, in its sole discretion, advance funds in any currency hereunder.

If: (a) BNY Mellon has advanced funds to an Account; (b) an overdraft has occurred in an Account (including overdrafts incurred in connection with funds transfers or foreign exchange transactions) or (c) Customer is for any other reason indebted to BNY Mellon, Customer agrees to repay BNY Mellon (on demand or upon becoming aware thereof) the amount of such advance, overdraft or indebtedness, plus accrued interest at a rate then charged by BNY Mellon to its institutional custody clients in the relevant currency.

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In order to secure repayment of Customer’s obligations and liabilities relating to a Series (whether or not matured) to BNY Mellon or any BNY Mellon Affiliate, whether or not relating to or arising under this Agreement, and without limiting BNY Mellon’s or such BNY Mellon Affiliate’s rights under applicable law or any other agreement, Customer hereby pledges and grants to BNY Mellon and such BNY Mellon Affiliate, and agrees BNY Mellon and such BNY Mellon Affiliate will have to the maximum extent permitted by law, a continuing first lien and security interest in: (a) all of Customer’s and such Series’ right, title and interest in and to the Account relating to such Series and the Assets now or hereafter held in such Account (including proceeds thereof) and (b) any other property at any time held by BNY Mellon or any BNY Mellon Affiliate relating to such Series; provided that Customer does not hereby grant a security interest in any securities issued by an affiliate (as defined in Section 23A of the U.S. Federal Reserve Act) of BNY Mellon. Customer represents, warrants and covenants that it owns the Assets in the Accounts, and such other property at any time held by BNY Mellon or any BNY Mellon Affiliate relating to Customer, free and clear of all liens, claims and security interests (except as otherwise acknowledged in writing by BNY Mellon), and that the first lien and security interest granted herein with respect to each Series will be subject to no setoffs, counterclaims or other liens prior to or on a parity with it in favor of any third party (other than specific liens granted preferred status by statute). Customer will take any additional steps required to assure BNY Mellon of such priority security interest, including notifying third parties or obtaining their consent. BNY Mellon will be entitled to collect from the relevant Account sufficient Cash for reimbursement. In this regard, BNY Mellon will be entitled to all the rights and remedies of a pledgee, secured creditor and/or securities intermediary under applicable laws, rules and regulations as then in effect as if Customer or the relevant Series is in default.

BNY Mellon has the right to debit any Cash for any amount payable by Customer in connection with any and all obligations and liabilities (whether or not matured) of Customer relating to a Series to BNY Mellon or any BNY Mellon Affiliate whether or not relating to or arising under this Agreement. In addition to the rights of BNY Mellon or such BNY Mellon Affiliate under applicable law or any other agreement, at any time when Customer has not honored any of its obligations relating to a Series to BNY Mellon or such BNY Mellon Affiliate, BNY Mellon will have the right without notice to Customer to retain or setoff against any obligations relating to such Series any cash BNY Mellon or any BNY Mellon Affiliate may directly or indirectly hold with respect to such Series and any obligations (whether or not matured) that BNY Mellon or any BNY Mellon Affiliate may have with respect to such Series in any currency. Any such cash or obligation relating to a Series may be transferred to BNY Mellon and any BNY Mellon Affiliate in order to effect the above rights.

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BNY Mellon will make available to Customer, through the Electronic Access Services, a monthly statement (or report for such other time period as the Parties may agree upon from time to time) reflecting all transfers to or from the Accounts during such month and all holdings in the Accounts as of the last business day of such month (or as of such other date(s) as the Parties may agree from time to time). Customer will promptly review each such statement and, within ninety (90) days of when such statement is made available by BNY Mellon, notify BNY Mellon of any exception or objection thereto. Notwithstanding the foregoing, Customer may notify BNY Mellon of any such exceptions or objections at any time; provided, however, that BNY Mellon will not be responsible or liable for any losses that could have been mitigated had such notice been provided during such ninety (90) day period.

The books and records directly pertaining to the Accounts which are in the possession of BNY Mellon will be the property of Customer. BNY Mellon will identify on its books and records the Assets belonging to Customer with respect to each Series. Customer and its authorized representatives will have the right, at Customer’s own expense and with reasonable prior written notice to BNY Mellon, to have reasonable access to those books and records directly pertaining to the Accounts. Any such access will occur during BNY Mellon’s normal business hours and will be subject to BNY Mellon’s applicable security policies and procedures. Upon Customer’s reasonable request, copies of those books and records directly pertaining to the Accounts will be provided by BNY Mellon to Customer or its authorized representative.

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In connection with this Agreement, Customer may enter into foreign exchange transactions (including foreign exchange hedging transactions) with BNY Mellon or a BNY Mellon Affiliate acting as a principal or otherwise through customary channels. Customer may issue standing Instructions with respect to any such foreign exchange transactions, subject to any rules or limitations that may apply to any foreign exchange facility made available to Customer. With respect to any such foreign exchange transactions, BNY Mellon or such BNY Mellon Affiliate is acting as a principal counterparty on its own behalf and is not acting as a fiduciary or agent for, or on behalf of, Customer, a Series, an investment manager or any Account.

In connection with this Agreement, Customer may issue standing Instructions to invest Cash in one or more sweep investment vehicles. Such investment vehicles may be offered by a BNY Mellon Affiliate or by a client of BNY Mellon, and BNY Mellon may receive compensation therefrom. By making investment vehicles available, BNY Mellon and its Affiliates will not be deemed to have recommended, endorsed or guaranteed any such investment vehicle in any way or otherwise to have acted as a fiduciary or agent for, or on behalf of, Customer, its investment manager or any Account. BNY Mellon will have no liability for any loss incurred on any such investments. Customer understands that Cash may be uninvested if it is received or reconciled to an Account after the applicable deadline to be swept into Customer’s selected investment vehicle.

Section 326 of the U.S. Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (including its implementing regulations) requires BNY Mellon to implement a customer identification program pursuant to which BNY Mellon must obtain certain information from Customer in order to verify Customer’s identity prior to establishing an Account. Accordingly, prior to establishing an Account, Customer will be required to provide BNY Mellon with certain information, including Customer’s name, physical address, tax identification number and other pertinent identifying information, to enable BNY Mellon to verify Customer’s identity. Customer acknowledges that BNY Mellon cannot establish an Account unless and until BNY Mellon has successfully performed such verification.

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In consideration of BNY Mellon’s services provided hereunder, Customer will (a) pay to BNY Mellon the fees set forth in the agreed upon fee schedule (as such fee schedule may be amended by BNY Mellon from time to time upon thirty (30) days’ prior written notice to Customer) and (b) reimburse BNY Mellon for any out-of-pocket and incidental expenses incurred by BNY Mellon in connection therewith. Unless otherwise agreed by the Parties, such amounts will be payable to BNY Mellon within thirty (30) days of Customer’s receipt of the relevant invoice. Without limiting BNY Mellon’s other rights set forth in this Agreement, BNY Mellon may charge interest on overdue amounts at a rate then charged by BNY Mellon to its institutional custody clients in the relevant currency.

BNY Mellon represents and warrants that: (a) it is duly organized, validly existing and in good standing in its jurisdiction of organization; (b) it has the requisite corporate power and authority to enter into and to carry out the transactions contemplated by this Agreement and (c) the individual executing this Agreement on its behalf has the requisite authority to bind BNY Mellon to this Agreement.

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In performing its duties under this Agreement, BNY Mellon will exercise the standard of care and diligence that a professional custodian would observe in these affairs taking into account the prevailing rules, practices, procedures and circumstances in the relevant market (“Standard of Care”).

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BNY Mellon will not be responsible or liable for any failure or delay in the performance of its obligations under this Agreement to the extent caused, directly or indirectly, by any event beyond its reasonable control, including acts of God, strikes or other labor disputes, work stoppages, acts of war, terrorism, general civil unrest, governmental or military actions, legal constraint or the interruption, loss or malfunction of utilities or communications or computer systems. BNY Mellon will promptly notify Customer upon the occurrence of any such event and will use commercially reasonable efforts to minimize its effect.

Customer will indemnify and hold harmless BNY Mellon from and against all losses, costs, expenses, damages and liabilities (including reasonable counsel fees and expenses) incurred by BNY Mellon arising out of or relating to BNY Mellon’s performance under this Agreement, except to the extent resulting from BNY Mellon’s failure to perform its obligations under this Agreement in accordance with the Standard of Care. The Parties agree that the foregoing will include reasonable counsel fees and expenses incurred by BNY Mellon in its successful defense of claims that are asserted by Customer against BNY Mellon arising out of or relating to BNY Mellon’s performance under this Agreement. Any obligations of Customer under this Section 12.4 with respect to a particular Series will not be satisfied out of the assets of another Series.

Each Party agrees to use the Confidential Information of the other Party solely to accomplish the purposes of this Agreement and, except in connection with such purposes or as otherwise permitted herein, not to disclose such information to any other Person without the prior written consent of the other Party. Notwithstanding the foregoing, BNY Mellon may: (a) use Customer’s Confidential Information in connection with certain functions performed on a centralized basis by BNY Mellon, its Affiliates and joint ventures and their service providers (including audit, accounting, risk, legal, compliance, sales, administration, product communication, relationship management, compilation and analysis of customer-related data and storage); (b) disclose such information to its Affiliates and joint ventures and to its

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and their service providers who are subject to confidentiality obligations and (c) store the names and business contact information of Customer’s employees and representatives relating to this Agreement on the systems or in the records of its Affiliates and joint ventures and its and their service providers. In addition, BNY Mellon may aggregate information regarding Customer and the Accounts on an anonymized basis with other similar client data for BNY Mellon’s and its Affiliates’ reporting, research, product development and distribution, and marketing purposes.

The Parties’ respective obligations under Section 13.1 will not apply to any such information: (a) that is, as of the time of its disclosure or thereafter becomes, part of the public domain through a source other than the receiving Party; (b) that was known to the receiving Party as of the time of its disclosure and was not otherwise subject to confidentiality obligations; (c) that is independently developed by the receiving Party without reference to such information; (d) that is subsequently learned from a third party not known to be under a confidentiality obligation to the disclosing Party or (e) that is required to be disclosed pursuant to applicable law, rule, regulation, requirement of any law enforcement agency, court order or other legal process or at the request of a regulatory authority.

The term of this Agreement will commence on the Effective Date and will continue in effect until terminated in accordance with the provisions herein.

Each Party may terminate this Agreement with respect to one or more Series by giving to the counter-Party a notice in writing specifying the date of such termination, which will be not less than ninety (90) days after the date of such notice.

Upon termination hereof, Customer will pay to BNY Mellon such compensation as may be due to BNY Mellon, and will reimburse BNY Mellon for other amounts payable or reimbursable to BNY Mellon hereunder, through the date of termination. BNY Mellon will follow such reasonable Instructions as Customer issues concerning the transfer of custody of records, Assets and other items; provided that (a) BNY Mellon will have no responsibility or liability for shipping and insurance costs associated therewith and (b) full payment has been made to BNY Mellon of its compensation, costs, expenses and other amounts to which it is entitled hereunder. If any Assets remain in any Account after termination, BNY Mellon may deliver to Customer such Assets.

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Any and all provisions of this Agreement which by their nature or effect are required or intended to be observed, kept or performed after the expiration or termination of this Agreement will survive the expiration or any termination of this Agreement and remain binding upon and for the Parties’ benefit, including Section 11 (Representations, Warranties and Covenants); Section 12 (Liability); Section 13 (Confidentiality); Section 14.3 (Effect of Termination); Section 14.4 (Survival) and Section 15.3 (Governing Law/Forum).

Neither Party may, without the other Party’s prior written consent, assign any of its rights or delegate any of its duties under this Agreement (whether by change of control, operation of law or otherwise); provided, however that BNY Mellon may, without the prior written consent of Customer, assign this Agreement or any of its rights, or delegate any of its duties hereunder: (a) to any BNY Mellon Affiliate; (b) to any successor to the business of BNY Mellon to which this Agreement relates, in which event BNY Mellon agrees to provide notice of such successor to Customer or (c) as otherwise permitted in this Agreement; provided further that any entity to which this Agreement is assigned by BNY Mellon without the prior written consent of Customer pursuant to a foregoing item (a), (b) or (c) will satisfy the requirements for serving as a custodian for a registered investment company. Any purported assignment or delegation by a Party in violation of this provision will be voidable at the option of the other Party. This Agreement will be binding upon, and inure to the benefit of, the Parties and their respective permitted successors and assigns.

This Agreement may be amended or modified only in a written agreement signed by an authorized representative of each Party. For purposes of the foregoing, email exchanges between the Parties will not be deemed to constitute a written agreement.

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BNY Mellon will implement business continuity and disaster recovery plans designed to minimize interruptions of service and ensure recovery of systems and applications used to provide the services under this Agreement. Such plans will cover the facilities, systems, applications and employees that are critical to the provision of the services hereunder, and will be tested at least annually to validate whether the recovery strategies, requirements, and protocols are viable and sustainable.

Customer hereby acknowledges and agrees that BNY Mellon is not a fiduciary by virtue of accepting and carrying out its obligations under this Agreement and has not accepted any fiduciary duties, responsibilities or liabilities with respect to its services hereunder, including with respect to the management, investment advisory or sub-advisory functions of Customer.

Other than routine communications in the ordinary course of providing or receiving services hereunder (including Instructions), notices given hereunder will be: (a) addressed to BNY Mellon or Customer at the address set forth on the signature page (or such other address as either Party may designate in writing to the other Party) and (b) sent by hand delivery, by certified mail, return receipt requested, or by overnight delivery service, in each case with postage or charges prepaid. All notices given in accordance with this Section will be effective upon receipt.

This Agreement constitutes the sole and entire agreement among the Parties with respect to the matters dealt with herein, and merges, integrates and supersedes all prior and contemporaneous discussions, agreements and understandings between the Parties, whether oral or written, with respect to such matters.

This Agreement is entered into solely between, and may be enforced only by, the Parties. Each Party intends that this Agreement will not, and no provision of this Agreement will be interpreted to, benefit, or create any right or cause of action in or on behalf of, any party or entity other than the Parties.

This Agreement may be executed in any number of counterparts, each of which will be deemed an original, and said counterparts when taken together will constitute one and the same instrument and may be sufficiently evidenced by one set of counterparts. This Agreement may also be executed and delivered by facsimile or email with confirmation of delivery and/or receipt.

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The terms and conditions of this Agreement are the result of negotiations between the Parties. The Parties intend that this Agreement will not be construed in favor of or against a Party by reason of the extent to which such Party or its professional advisors participated in the preparation or drafting of this Agreement.

No failure or delay by a Party to exercise any right, remedy or power it has under this Agreement will impair or be construed as a waiver of such right, remedy or power. A waiver by a Party of any provision or any breach of any provision will not be construed to be a waiver by such Party of such provision in any other instance or any succeeding breach of such provision or a breach of any other provision. All waivers will be in writing and signed by an authorized representative of the waiving Party.

All section and subsection headings in this Agreement are included for convenience of reference only and will not be considered in the interpretation of the scope or intent of any provision of this Agreement

If a court of competent jurisdiction determines that any provision of this Agreement is illegal or invalid for any reason, such illegality or invalidity will not affect the validity of the remainder of this Agreement. In such case, the Parties will negotiate in good faith to replace each illegal or invalid provision with a valid, legal and enforceable provision that fulfills as closely as possible the original intent of the Parties.

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IN WITNESS WHEREOF, the Parties have executed this Agreement as of the Effective Date.

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