Forward Purchase Agreement, dated as of November 9, 2022, by and among Blockchain Coinvestors Acquisition Corp. I, Vellar Opportunity Fund SPV LLC - Series 5, and Qenta Inc

PO Box 1093, Boundary Hall

Cricket Square, Grand Cayman

KY1-1102, Cayman Islands

Each of Counterparty, Target and Seller represents and warrants to, and covenants and agrees with, the other as of the date on which it enters into the Transaction that (in the absence of any written agreement between the parties that expressly imposes affirmative obligations to the contrary for the Transaction):

Non-Reliance. It is acting for its own account, and it has made its own independent decisions to enter into the Transaction and as to whether the Transaction is appropriate or proper for it based upon its own judgment and upon advice from such advisers as it has deemed necessary. It is not relying on any

Assessment and Understanding. It is capable of assessing the merits of and understanding (on its own behalf or through independent professional advice), and understands and accepts, the terms, conditions and risks of the Transaction. It is also capable of assuming, and assumes, the risks of the Transaction.

Non-Public Information. It is in compliance with Section 10(b) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Eligible Contract Participant. It is an “eligible contract participant” under, and as defined in, the Commodity Exchange Act (7 U.S.C. § 1a(18)) and CFTC regulations (17 CFR § 1.3).

Tax Characterization. It shall treat the Transaction as a derivative financial contract for U.S. federal income tax purposes, and it shall not take any action or tax return filing position contrary to this characterization.

Private Placement. It (i) is an “accredited investor” as such term is defined in Regulation D as promulgated under the Securities Act, (ii) is entering into the Transaction for its own account without a view to the distribution or resale thereof and (iii) understands that the assignment, transfer or other disposition of the Transaction has not been and will not be registered under the Securities Act.

Investment Company Act. It is not and, after giving effect to the Transaction, will not be required to register as an “investment company” under, and as such term is defined in, the Investment Company Act of 1940, as amended.

Authorization. The Transaction, including this Confirmation, has been entered into pursuant to authority granted by its board of directors or other governing authority. It has no internal policy, whether written or oral, that would prohibit it from entering into any aspect of the Transaction, including, but not limited to, the purchase of Shares to be made in connection therewith.

Affiliate Status. It is the intention of the parties hereto that Seller shall not be an “affiliate” (as such term is defined in Rule 405 under the Securities Act) of the Counterparty including Blockchain or the Combined Company following the closing of the Business Combination, as a result of the transactions contemplated hereunder.

Counterparty represents and warrants to, and covenants and agrees with Seller as of the date on which it enters into the Transaction that:

Total Assets. Blockchain has total assets as of the date hereof and expects to have as of the closing of the Business Combination of at least USD $5,000,001.

Non-Reliance. Without limiting the generality of Section 13.1 of the Equity Definitions, Counterparty acknowledges that Seller is not making any representations or warranties or taking any position or expressing any view with respect to the treatment of the Transaction under any accounting standards.

Solvency. Counterparty is, and shall be as of the date of any payment or delivery by Counterparty under the Transaction, solvent and able to pay its debts as they come due, with assets having a fair value greater than liabilities and with capital sufficient to carry on the businesses in which it engages. Counterparty: (i) has not engaged in and will not engage in any business or transaction after which the property remaining with it will be unreasonably small in relation to its business, (ii) has not incurred and does not intend to incur debts beyond its ability to pay as they mature, and (iii) as a result of entering into and performing its obligations

Public Reports. As of the Trade Date, Counterparty is in material compliance with its reporting obligations under the Exchange Act, and all reports and other documents filed by Counterparty with the Securities and Exchange Commission pursuant to the Exchange Act, when considered as a whole (with the most recent such reports and documents deemed to amend inconsistent statements contained in any earlier such reports and documents), do not contain any untrue statement of a material fact or any omission of a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

No Distribution. Except with respect to any Shares that may be offered and sold pursuant to the Registration Statement, Counterparty is not entering into the Transaction to facilitate a distribution of the Shares (or any security that may be converted into or exercised or exchanged for Shares, or whose value under its terms may in whole or in significant part be determined by the value of the Shares) or in connection with any future issuance of securities.

SEC Documents. The Counterparty shall comply with the Securities and Exchange Commission’s guidance, including Compliance and Disclosure Interpretation No. 166.01, for all relevant disclosure in connection with this Confirmation and the Transaction, and will not file with the Securities and Exchange Commission any Form 8-K (or Form 6-K (if applicable)), Registration Statement on Form S-4 (or Form F-4 (if applicable)) (including any post-effective amendment thereof), proxy statement, or other document that includes any disclosure regarding this Confirmation or the Transaction without consulting with and reasonably considering any comments received from Seller, provided that, no consultation shall be required with respect to any subsequent disclosures that are substantially similar to prior disclosures by Counterparty that were reviewed by Seller.

Waiver. The Counterparty hereby waives any violation of its “bulldog clause” and any other restrictions that would be caused by Seller entering into this Transaction.

Disclosure. The Counterparty shall preview with Seller all public disclosure relating to the Transaction and shall consult with Seller to ensure that such public disclosure, including the press release, Form 8-K (or Form 6-K (if applicable)) or other filing that announces the Transaction adequately discloses the material terms and conditions of the Transaction in form and substance reasonably acceptable to Seller; provided that the Form 8-K (or Form 6-K (if applicable)) shall be publicly filed on the same date that definitive transaction documents are signed and provided further, that to the extent definitive transaction documents are not signed at least 48 hours prior to the Redemption Deadline, the Counterparty agrees to make all necessary disclosures (if any) at least 24 hours prior to the Redemption Deadline to ensure that Seller is not in possession of material non-public information as a result of the transactions outlined herein.

Listing. The Counterparty agrees to use its best efforts to maintain the listing of the Shares on a national securities exchange; provided that if the Shares cease to be listed on a national securities exchange or upon the filing of a Form 25 (each a “Delisting Event”), Seller may accelerate the Maturity Date under this Confirmation by delivering notice to the Counterparty and shall be entitled to the Break-up Fees, which shall be due and payable immediately following the Maturity Date.

Regulatory Filings. Counterparty covenants that it will make all regulatory filings that it is required by law or regulation to make with respect to the Transaction.

Regulation M and Target Approvals. Counterparty is not on the Trade Date and agrees and covenants that it will not be on any date Seller is purchasing shares that may be included in a Pricing Date Notice, engaged or engaging in a distribution, as such term is used in Regulation M under the Exchange Act, of any securities of Counterparty, other than a distribution meeting the requirements of the exception set forth in Rules 101(b)(10) and 102(b)(7) of Regulation M. Counterparty shall not, until the second scheduled trading

Other Agreements. Counterparty covenants and agrees that it has not and will not enter into any other (i) OTC Equity Prepaid Forward Transactions or similar transaction(s) or agreement(s) with any other person(s) without the prior written consent of Seller or (ii) agreements or arrangements that would change or have the effect of changing or manipulating the number of redemptions for purposes of canceling this Transaction, including the Confirmation, as set forth in Break-up Fees.

No conflicts. The execution and delivery by the Counterparty and Target of, and the performance by the Counterparty and the Target of its obligations under, the Transaction and the Confirmation and the consummation of the transactions contemplated by the Confirmation, including the payments and share issuances hereunder, do not and will not result in any breach or violation of or constitute a default under (nor constitute any event which, with notice, lapse of time or both, would result in any breach or violation of or constitute a default under or give the holder of any indebtedness (or a person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a part of such indebtedness under) (or result in the creation or imposition of a lien, charge or encumbrance on any property or assets of the Counterparty, the Target or any of their respective subsidiaries pursuant to) (i) any provision of applicable law, (ii) the organizational documents of any of the Counterparty, the Target or any of their respective subsidiaries, (iii) any indenture, mortgage, deed of trust, bank loan or credit agreement or other evidence of indebtedness, or any license, lease, contract or other agreement or instrument binding upon the Counterparty, the Target or any of their respective subsidiaries, or (iv) any judgment, order or decree of any governmental body, agency or court having jurisdiction over the Counterparty, the Target or any of their respective subsidiaries, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency is required for the performance by the Counterparty or the Target of their respective obligations under the Confirmation, except as have been obtained. In addition, the Counterparty and Target covenant and agree not to enter into any agreement or other arrangement that would prohibit, restrict or otherwise prevent the Counterparty from performing its obligations hereunder, including the making of any payment or Share issuance to the Seller.

Seller represents and warrants to, and covenants and agrees with Counterparty as of the date on which it enters into the Transaction and each other date specified that:

Regulatory Filings. Seller covenants that it will make all regulatory filings that it is required by law or regulation to make with respect to the Transaction including, without limitation, as may be required by Section 13 or Section 16 (if applicable) under the Exchange Act and, assuming the accuracy of Counterparty’s Repurchase Notices (as described under “Repurchase Notices” below) any sales of the Recycled Shares and the Additional Shares will be in compliance therewith.

Shorting. From the date of this Confirmation, neither Seller nor any of its affiliates nor any entity managed by Seller or its affiliates will, directly or indirectly, effect any Short Sales in respect of the Shares prior to the earlier of a) the Maturity Date and b) the cancellation of the Transaction. “Short Sales” means all “short sales” as defined in Rule 200 promulgated under Regulation SHO under the Exchange Act, whether or not against the box, and all types of direct and indirect stock pledges, forward sale contracts, options, puts, calls, short sales, swaps, “put equivalent positions” (as defined in Rule 16a-1(h) under the Exchange Act) and similar arrangements (including on a total return basis).

Seller hereby waives the redemption rights (“Redemption Rights”) set forth in the Certificate of Incorporation in connection with the Business Combination with respect to the Subject Shares only during the term of this Confirmation. Seller may sell or otherwise transfer, loan or dispose of any of the Shares or any other shares or securities of the Counterparty in one or more public or private transactions at any time. Any Subject Shares that are not Shortfall Sale Shares sold by Seller during the term of the Transaction will cease to be included in the Number of Shares.

Unless otherwise noted herein, Seller will give written notice to Counterparty of any sale of Subject Shares by Seller within one (1) Local Business Day following the date of such sale, such notice to include the date of the sale and the number of Subject Shares sold.

Rule 10b5-1.

Counterparty represents and warrants to Seller that Counterparty is not entering into the Transaction to create actual or apparent trading activity in the Shares (or any security convertible into or exchangeable for the Shares) or to raise or depress or otherwise manipulate the price of the Shares (or any security convertible into or exchangeable for the Shares) for the purpose of inducing the purchase or sale of such securities or otherwise in violation of the Exchange Act, and Counterparty represents and warrants to Seller that Counterparty has not entered into or altered, and agrees that Counterparty will not enter into or alter, any corresponding or hedging transaction or position with respect to the Shares.

Counterparty agrees that it will not seek to control or influence Seller’s decision to make any “purchases or sales” under the Transaction, including, without limitation, Seller’s decision to enter into any hedging transactions. Counterparty represents and warrants that it has consulted with its own advisors as to the legal aspects of its adoption and implementation of this Confirmation and the Transaction under the federal securities laws, including without limitation, the prohibitions on manipulative and deceptive devices under the Exchange Act.

Counterparty acknowledges and agrees that any amendment, modification, waiver or termination of this Confirmation must be effected in accordance with the requirements for the amendment or termination of a written trading plan for trading securities.. Without limiting the generality of the foregoing, Counterparty acknowledges and agrees that any such amendment, modification, waiver or termination shall be made in good faith and not as part of a plan or scheme to evade compliance with the federal securities laws, including without limitation the prohibition on manipulative and deceptive devises under the Exchange Act and no such amendment, modification or waiver shall be made at any time at which Counterparty or any officer, director, manager or similar person of Counterparty is aware of any material non-public information regarding Counterparty or the Shares.

Repurchase Notices. Counterparty shall, on any day on which Counterparty effects any repurchase of Shares (other than in connection with a Counterparty equity compensation program (e.g., to fund taxes in connection with vested RSUs), promptly give Seller a written notice of such repurchase (a “Repurchase Notice”), provided that Counterparty agrees that this information does not constitute material non-public information; provided further if this information shall be material non-public information, it shall publicly disclosed immediately. Counterparty agrees to indemnify and hold harmless Seller and its affiliates and their respective officers, directors, employees, affiliates, advisors, agents and controlling persons (each, an “Indemnified Person”) from and against any and all losses (including losses relating to Seller’s hedging activities as a consequence of remaining or becoming a Section 16 “insider” following the closing of the Business Combination, including without limitation, any forbearance from hedging activities or cessation of hedging activities and any losses in connection therewith with respect to the Transaction), claims, damages, judgments, liabilities and expenses (including reasonable attorney’s fees), joint or several, which an Indemnified Person may become subject to, as a result of Counterparty’s failure to provide Seller with a Repurchase Notice on the day and in the manner specified in this paragraph, and to reimburse, within thirty (30) days, upon written request, each of such Indemnified Persons for any reasonable legal or other expenses incurred in connection with investigating, preparing for, providing testimony or other evidence in connection with or defending any of the foregoing; provided, however, for the avoidance of doubt, Counterparty has no indemnification or other obligations with respect to Seller becoming a Section 16 “insider” prior to the closing of the Business Combination. If any suit, action, proceeding (including any governmental or regulatory investigation), claim or demand shall be brought or asserted against the Indemnified Person as a result of Counterparty’s failure to provide Seller with a Repurchase Notice in accordance with this paragraph, such Indemnified Person shall promptly notify Counterparty in writing, and Counterparty, upon request of the Indemnified Person, shall retain counsel reasonably satisfactory to the Indemnified Person to represent the Indemnified Person and any others Counterparty may designate in such proceeding and shall pay the fees and expenses of such counsel related to such proceeding. Counterparty shall not be liable for any settlement of any proceeding contemplated by this paragraph that is effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, Counterparty agrees to indemnify any Indemnified Person from and against any loss or liability by reason of such settlement or judgment. Counterparty shall not, without the prior written consent of the Indemnified Person, effect any settlement of any pending or threatened proceeding contemplated by this paragraph that is in respect of which any Indemnified Person is or could have been a party and indemnity could have been sought hereunder by such Indemnified Person, unless such settlement includes an unconditional release of such Indemnified Person from all liability on claims that are the subject matter of such proceeding on terms reasonably satisfactory to such Indemnified Person. If the indemnification provided for in this paragraph is unavailable to an Indemnified Person or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then Counterparty hereunder, in lieu of indemnifying such Indemnified Person thereunder, shall contribute to the amount paid or payable by such Indemnified Person as a result of such losses, claims, damages or liabilities. The remedies provided for in this paragraph are not exclusive and shall not limit any rights or remedies which may otherwise be available to any Indemnified Person at law or in equity. The indemnity and contribution agreements contained in this paragraph shall remain operative and in full force and effect regardless of the termination of the Transaction.

Transfer or Assignment. The Seller may freely transfer or assign the rights and duties under this Confirmation. If at any time following the closing of the Business Combination at which (A) the Section 16 Percentage exceeds 9.9%, or (B) the Share Amount exceeds the Applicable Share Limit (if any applies) (any such condition described in clause (A) or (B), and “Excess Ownership Position”), Seller is unable to effect a transfer or assignment of a portion of the Transaction to a third party on pricing terms reasonably acceptable to Seller and within a time period reasonably acceptable to Seller such that no Excess Ownership Position exists, then Seller may designate any Local Business Day as an Early Termination Date with respect to a portion of the Transaction (the “Terminated Portion”), such that following such partial termination no Excess Ownership Position exists. In the event that Seller so designates an Early Termination Date with respect to a portion of the Transaction, a portion of the Shares with respect to the

Indemnification. Counterparty agrees to indemnify and hold harmless Seller, its affiliates and its assignees and their respective directors, officers, employees, agents and controlling persons (each such person being an “Indemnified Party”) from and against any and all losses (but not including financial losses to an Indemnified Party relating to the economic terms of the Transaction provided that the Counterparty performs its obligations under this Confirmation in accordance with its terms), claims, damages and liabilities (or actions in respect thereof) expenses, joint or several, incurred by or asserted against such Indemnified Party arising out of, in connection with, or relating to, investigating, preparing or defending against any litigation, commenced or threatened, or any claim whatsoever, whether arising out of any action between any of the Indemnified Parties and the Counterparty or between any of the Indemnified Parties and any third party, or otherwise) to which they or any of them may become subject under the Securities Act, the Exchange Act or any other statute or at common law or otherwise or under the laws of foreign countries, arising out of or based upon the Transaction, including the execution or delivery of this Confirmation, the performance by Counterparty of its obligations under the Transaction, any breach of any covenant, representation or warranty made by Counterparty in this Confirmation or the ISDA Form, regulatory filings and submissions made by or on behalf of the Counterparty related to the Transaction (other than as relates to any information provided in writing by or on behalf of Seller or its affiliates), or the consummation of the transactions contemplated hereby, including the Registration Statement or any untrue statement or alleged untrue statement of a material fact contained in any registration statement, press release, filings or other document, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. Counterparty will not be liable under the foregoing indemnification provision to the extent that any loss, claim, damage, liability or expense is related to the manner in which Seller sells, or arising out of any sales by Seller of, any Shares, including the Subject Shares or found in a nonappealable judgment by a court of competent jurisdiction to have resulted from Seller’s material breach of any covenant, representation or other obligation in this Confirmation or the ISDA Form or from Seller’s willful misconduct, bad faith or gross negligence in performing the services that are subject of the Transaction. If for any reason the foregoing indemnification is unavailable to any Indemnified Party or insufficient to hold harmless any Indemnified Party, then Counterparty shall contribute, to the maximum extent permitted by law, to the amount paid or payable by the Indemnified Party as a result of such loss, claim, damage or liability. In addition (and in addition to any other Reimbursement of Legal Fees and other Expenses contemplated by this Confirmation), Counterparty will reimburse any Indemnified Party for all reasonable, out-of-pocket, expenses (including reasonable counsel fees and expenses) as they are incurred in connection with the investigation of, preparation for or defense or settlement of any pending or

Amendments to Equity Definitions.

Section 12.6(a)(ii) of the Equity Definitions is hereby amended by (i) deleting from the fourth line thereof the word “or” after the word “official” and inserting a comma therefor, and (ii) deleting the semi-colon at the end of subsection (B) thereof and inserting the following words therefor “or (C) the occurrence of any of the events specified in Section 5(a)(vii)(1) through (9) of the ISDA Form with respect to that Issuer.”; and

Section 12.6(c)(ii) of the Equity Definitions is hereby amended by replacing the words “the Transaction will be cancelled,” in the first line with the words “Seller will have the right, which it must exercise or refrain from exercising, as applicable, in good faith acting in a commercially reasonable manner, to cancel the Transaction,”;

Waiver of Jury Trial. Each party waives, to the fullest extent permitted by applicable law, any right it may have to a trial by jury in respect of any suit, action or proceeding relating to the Transaction. Each party (i) certifies that no representative, agent or attorney of either party has represented, expressly or otherwise, that such other party would not, in the event of such a suit, action or proceeding, seek to enforce the foregoing waiver and (ii) acknowledges that it and the other party have been induced to enter into the Transaction, as applicable, by, among other things, the mutual waivers and certifications provided herein.

Attorney and Other Fees. Subject to clause (d) Indemnification (above), in the event of any legal action initiated by any party arising under or out of, in connection with or in respect of, this Confirmation or the Transaction, the prevailing party shall be entitled to reasonable attorneys’ fees, costs and expenses incurred in such action, as determined and fixed by the court.

Tax Disclosure. Effective from the date of commencement of discussions concerning the Transaction, Counterparty and each of its employees, representatives, or other agents may disclose to any and all persons, without limitation of any kind, the tax treatment and tax structure of the Transaction and all materials of any kind (including opinions or other tax analyses) that are provided to Counterparty relating to such tax treatment and tax structure.

Securities Contract; Swap Agreement. The parties hereto intend for (i) the Transaction to be (a) a “securities contract” as defined in the Bankruptcy Code, in which case each payment and delivery made pursuant to the Transaction is a “termination value,” “payment amount” or “other transfer obligation” within the meaning of Section 362 of the Bankruptcy Code and a “settlement payment,” within the meaning of Section 546 of the Bankruptcy Code, and (b) a “swap agreement” as defined in the Bankruptcy Code, with respect to which each payment and delivery hereunder or in connection herewith is a “termination value,” “payment amount” or “other transfer obligation” within the meaning of Section 362 of the Bankruptcy Code and a “transfer,” as such term is defined in Section 101(54) of the Bankruptcy Code and a “payment or other transfer of property” within the meaning of Sections 362 and 546 of the Bankruptcy Code, and the parties hereto to be entitled to the protections afforded by, among other Sections, Sections 362(b)(6), 362(b)(17), 546(e), 546(g), 555 and 560 of the Bankruptcy Code, (ii) a party’s right to liquidate, terminate and accelerate the Transaction and to exercise any other remedies upon the occurrence of any

Process Agent. For the purposes of Section 13(c) of the ISDA Form:

/s/ Lou Kerner

/s/ Lou Kerner

/s/ Brent de Jong