Document:

EX-10.3

 Exhibit 10.3 

FORM OF LOCK-UP AGREEMENT 

This Lock-Up Agreement (this “Agreement”), dated as of November 10, 2022, is
among Blockchain Coinvestors Acquisition Corp. I, an exempted company incorporated in the Cayman Islands with limited liability (the “Company”) and the other parties hereto identified as a “Holder” on the signature pages
and Schedule A hereto (each, a “Holder” and collectively, the “Holders”). 
 RECITALS

 WHEREAS, the Company, BCSA Merger Sub, Inc., a Delaware corporation (“Merger Sub”), and QENTA Inc., a Delaware
corporation (“QENTA”) are parties to the Business Combination Agreement, dated as of the date hereof (the “Business Combination Agreement”), by and among the Company, Merger Sub and QENTA, pursuant to which, among
other things, on the Closing Date, Merger Sub will merge with and into QENTA, with QENTA surviving the Merger as a wholly-owned subsidiary of the Company (the “Merger”); 

[WHEREAS, the Company, Blockchain Coinvestors Acquisition Sponsors I LLC, a Delaware limited liability company (the
“Sponsor”) and each of the Insiders (as defined in such agreements, and, together with the Sponsor, the “Original Holders”) are parties to certain Letter Agreements dated as of November 9, 2021 (the
“Prior Agreements”).]*1 
 WHEREAS, in connection with the Merger and
effective upon the consummation thereof, the parties hereto wish to set forth herein certain understandings between the parties with respect to restrictions on transfer of equity interests in the Company. 

NOW, THEREFORE, in consideration of the foregoing, the parties hereby agree as follows: 

ARTICLE I 
 DEFINITIONS

 Section 1.1 Definitions. For purposes of this Agreement, the following terms have the meanings set forth below: 

“Agreement” has the meaning set forth in the Preamble. 

“Board” means the Board of Directors of the Company. 

“Business Combination Agreement” has the meaning set forth in the Recitals. 

“Change in Control” means the transfer (whether by tender offer, merger, stock purchase, consolidation or other similar
transaction), in one transaction or a series of related transactions, to a person or group of affiliated persons of the Company’s voting securities if, after such transfer, such person or group of affiliated persons would hold more than 50% of
outstanding voting securities of the Company (or surviving entity) or would otherwise have the power to control the board of directors of the Company or to direct the operations of the Company. 

“Closing Date” has the meaning set forth in the Business Combination Agreement. 

 

	1 	 Note to Form: Bracketed language marked with an asterisk (*) throughout the form to be included in the
execution version of the lock-up agreement that provides for a 180-day lock-up period. 

 “Commission” means the Securities and Exchange Commission. 

“Common Stock” means the Company’s common stock, par value $0.0001 per share. 

“Company” has the meaning set forth in the Preamble. 

“Covered Shares” means, with respect to any Holder, the shares of Common Stock beneficially owned or owned of record by such
Holder. 
 “Effective Time” shall have the meaning set forth in the Business Combination Agreement. 

“Holders” has the meaning set forth in the Preamble. 

“Lock-up Period” has the meaning set forth in
Section 2.1.1. 
 “Merger” has the meaning set forth in the Recitals. 

“Merger Sub” has the meaning set forth in the Recitals. 

[“Original Holders” has the meaning set forth in the Recitals.]* 

“Permitted Transferees” has the meaning set forth in Section 2.2. 

[“Prior Agreements” has the meaning set forth in the Recitals.]* 

“QENTA” has the meaning set forth in the Recitals. 

[“Sponsor” has the meaning set forth in the Recitals.]* 

“Transfer” means to, directly or indirectly, sell, transfer, assign, pledge, encumber, hypothecate or similarly dispose of,
either voluntarily or involuntarily, or to enter into any contract, option or other arrangement or understanding with respect to the sale, transfer, assignment, pledge, encumbrance, hypothecation or similar disposition of, any interest owned by a
person or any interest (including a beneficial interest) in, or the ownership, control or possession of, any interest owned by a person. 

ARTICLE II 
 LOCK-UP 
 Section 2.1 Lock-Up. 

2.1.1 Except as permitted by Section 2.2, each Holder shall not Transfer any of such Holder’s Covered Shares
until the date that is [60 // 180]5 days from the Closing Date (the “Lock-up Period”). Each certificate evidencing any Covered Shares may
include any legend that the Company deems appropriate to reflect the restrictions on Transfer set forth in this Agreement, in addition to any other applicable legends. 

 

	5 	 Note to Form: Lock-up period to be 180 days for all holders
except five Qenta shareholders will have a 60-day lock-up period 

  
 2 

 2.1.2 During the Lock-up Period, any purported
Transfer by a Holder of such Holder’s Covered Shares not in accordance with this Agreement shall be null and void, and the Company shall refuse to recognize any such Transfer for any purpose. In order to enforce this
Section 2.1, the Company may impose stop-transfer instructions with respect to the Covered Shares of such Holder (and the Permitted Transferees and assigns thereof) until the end of the
Lock-Up Period and any extensions applicable at the time, except for Transfers in compliance with the exceptions in Section 2.2. 

2.1.3 Each Holder acknowledges and agrees that, notwithstanding anything to the contrary contained in this Agreement, such Holder’s
Covered Shares shall remain subject to any restrictions on Transfer under applicable securities laws of any governmental entity, including all applicable holding periods under the Securities Act of 1933, as amended, and any successor thereto, as the
same shall be in effect from time to time and other rules of the Commission. 
 Section 2.2 Exceptions. The provisions of
Section 2.1 shall not apply to: 
 2.2.1 Transfers of shares of Common Stock or any security convertible into or
exercisable or exchangeable for Common Stock as a bona fide gift or charitable contribution; 
 2.2.2 Transfers of shares of Common Stock by
a Holder to a trust, or other entity formed for estate planning purposes for the primary benefit of the spouse, domestic partner, parent, sibling, child or grandchild of such Holder; 

2.2.3 Transfers by will or intestate succession upon the death of such Holder; 

2.2.4 the Transfer of shares of Common Stock pursuant to a qualified domestic order, court order or in connection with a divorce settlement;

 2.2.5 if a Holder is a corporation, partnership (whether general, limited or otherwise), limited liability company, trust or other
business entity, (i) Transfers to another corporation, partnership, limited liability company, trust or other business entity that controls, is controlled by or is under common control or management with such Holder, or (ii) distributions
of shares of Common Stock to partners, limited liability company members or stockholders of such Holder, including, for the avoidance of doubt, if such Holder is a partnership, to its general partner or a successor partnership or fund, or any other
funds managed by such partnership; 
 2.2.6 if Holder is a trust, Transfers to a trustor or beneficiary of the trust or to the estate of a
beneficiary of such trust; 
 2.2.7 Transfers to the Company’s officers, directors or their affiliates; 

2.2.8 Transfers to a nominee or custodian of a person or entity to whom a Transfer would be permissible under Sections 2.2.1 through
2.2.7; 
 2.2.9 Transfers pursuant to a bona fide third-party tender offer, merger, stock sale, recapitalization, consolidation or
other transaction involving a Change in Control of the Company; provided, however, that in the event that such tender offer, merger, recapitalization, consolidation or other such transaction is not completed, the Common Stock subject
to this Agreement shall remain subject to this Agreement; 

  
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 provided, however, that in the case of any Transfer pursuant to Sections
2.2.1 through 2.2.8, each pledgee or transferee shall agree in writing, in form and substance reasonably satisfactory to the Company, to be bound by the provisions of this Agreement (such transferees, “Permitted
Transferees”). 
 Section 2.3 Release of Lock-up Restrictions. Notwithstanding
the other provisions set forth herein, the Board may, in its sole discretion, determine to waive, amend, or repeal the restrictions set forth in Section 2.1 above, whether in whole or in part; provided, that any such
waiver, amendment or repeal shall not make such restrictions more restrictive or apply for a longer period of time. 
 Section 2.4
[Other Lock-up Restrictions. Each of (a) the Company and (b) if such Holder is an Original Holder, each Holder hereby acknowledges and agrees that this Article II supersedes
Section 5 of each of the Prior Agreements in all respects, and, upon execution of this Agreement by each of the Company and the Holders, the Prior Agreements shall be deemed amended to remove
Section 5 of each of the Prior Agreements.]* 
 ARTICLE III 

TERMINATION 

Section 3.1 Termination. This Agreement shall terminate upon the earliest to occur of: (i) the termination of the Business
Combination Agreement in accordance with its terms, and (ii) the date on which neither the Holders nor any of their Permitted Transferees are subject to the restrictions contained in Section 2.1. 

Section 3.2 Effect of Business Combination Agreement Termination. This Agreement shall only become effective at the Effective
Time, and prior to such date this Agreement shall be of no force and effect. In the event of a termination of this Agreement as a result of the termination of the Business Combination Agreement, this Agreement shall become void. 

ARTICLE IV 
 GENERAL
PROVISIONS 
 Section 4.1 Notices. All notices, requests, claims, demands and other communications hereunder shall be in
writing and shall be given and shall be deemed to have been duly given when delivered (i) by delivery in person, (ii) by e-mail, having obtained electronic delivery confirmation thereof (i.e., an
electronic record of the sender that the e-mail was sent to the intended recipient thereof without an “error” or receipt of a similar message that such e-mail
was not deliverable or not received by such intended recipient), or (iii) by nationally recognized overnight delivery service to the other parties as follows (or at such other address or email address for a party as shall be specified in a
notice given in accordance with this Section 4.1): 
 If to the Company, to it at: 

Blockchain Coinvestors Acquisition Corp. I 

PO Box 1093, Boundary Hall 

Cricket Square, Grand Cayman 
 KY1-1102, Cayman Islands 
 Attention: Lou Kerner 

  
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 with a copy (which shall not constitute notice) to: 

Perkins Coie LLP 
 1120 N.W. Couch
Street Tenth Floor 
 Portland, Oregon 97209 

Attention: M. Christopher Hall and Gina Eiben 

If to a Holder, to the address or email address set forth for Holder on the signature page hereof. 

Section 4.2 Severability. Whenever possible, each provision of this Agreement will be interpreted in such a manner as to be
effective and valid under applicable law, but if any term or other provision of this Agreement is held to be invalid, illegal or unenforceable under applicable law, all other provisions of this Agreement shall remain in full force and effect so long
as the economic or legal substance of the subject matter hereof is not affected in any manner materially adverse to any party hereto. Upon such determination that any term or other provision of this Agreement is invalid, illegal or unenforceable
under applicable law, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original intent of the parties hereto as closely as possible in an acceptable manner in order that the transactions contemplated
hereby are consummated as originally contemplated to the greatest extent possible. 
 Section 4.3 Entire Agreement; Assignment.
This Agreement constitutes the entire agreement among the parties with respect to the subject matter hereof and supersedes all prior agreements and undertakings, both written and oral, among the parties, or any of them, with respect to the subject
matter hereof. This Agreement may not be assigned (whether by operation of law or otherwise) by any party without the prior express written consent of the Company. 

Section 4.4 Parties in Interest. This Agreement shall be binding upon and inure solely to the benefit of each party hereto (and
its respective permitted assigns), and nothing in this Agreement, express or implied, is intended to or shall confer upon any other person any right, benefit or remedy of any nature whatsoever under or by reason of this Agreement. 

Section 4.5 Governing Law. This Agreement, and any rights or claims arising from or relating to this Agreement or the transactions
contemplated hereby, shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to any choice of law or conflict of law provision or rule (whether of the State of Delaware or any other
jurisdiction) that would cause the application of the law of any jurisdiction other than the State of Delaware. 
 Section 4.6
Waiver of Jury Trial. EACH OF THE PARTIES HERETO HEREBY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY WITH RESPECT TO ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN
CONNECTION WITH THIS AGREEMENT. EACH OF THE PARTIES HERETO (I) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO
ENFORCE THAT FOREGOING WAIVER AND (II) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED HEREBY, AS APPLICABLE, BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND
CERTIFICATIONS IN THIS SECTION 4.6. 

  
 5 

 Section 4.7 Submission to Jurisdiction. Each of the parties hereto irrevocably
and unconditionally submits to the exclusive jurisdiction of the Chancery Court of the State of Delaware (or, if the Chancery Court of the State of Delaware lacks or declines to accept jurisdiction, the Superior Court of the State of Delaware, or
the United States District Court for the District of Delaware), for the purposes of any proceeding, claim, demand, action or cause of action arising under, for enforcement or breach of, or relating to this Agreement or any of the transactions
contemplated hereby, and irrevocably and unconditionally waives any objection to the laying of jurisdiction and venue of any such proceeding in any such court, and further irrevocably and unconditionally waives and agrees not to plead or claim in
any such court that any such proceeding has been brought in an inconvenient forum. Each party hereto hereby irrevocably and unconditionally waives, and agrees not to assert, by way of motion or as a defense, counterclaim or otherwise, in any
proceeding claim, demand, action or cause of action against such party arising under, for enforcement or breach of, or relating to this Agreement or any of the transactions contemplated hereby, (a) any claim that such party is not personally
subject to the jurisdiction of the courts as described in this Section 4.7 for any reason, (b) that such party or such party’s property is exempt or immune from the jurisdiction of any such court or from any legal
process commenced in such courts (whether through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of judgment or otherwise) and (c) that (i) the proceeding, claim, demand, action or cause
of action in any such court is brought against such party in an inconvenient forum, (ii) the venue of such proceeding, claim, demand, action or cause of action against such party is improper or (iii) this Agreement, or the subject matter
hereof, may not be enforced against such party in or by such courts. Each party agrees that service of any process, summons, notice or document by registered mail to such party’s respective address set forth in
Section 4.1 shall be effective service of process for any such proceeding, claim, demand, action or cause of action. 

Section 4.8 Construction; Interpretation. The headings set forth in this Agreement are inserted for convenience only and shall not
affect in any way the meaning or interpretation of this Agreement. No party, nor its respective counsel, shall be deemed the drafter of this Agreement for purposes of construing the provisions hereof, and all provisions of this Agreement shall be
construed according to their fair meaning and not strictly for or against any party. Unless otherwise indicated to the contrary herein by the context or use thereof: (a) the words, “herein,” “hereto,” “hereof” and
words of similar import refer to this Agreement as a whole, including the Schedules, and not to any particular section, subsection, paragraph, subparagraph or clause set forth in this Agreement; (b) masculine gender shall also include the
feminine and neutral genders, and vice versa; (c) words importing the singular shall also include the plural, and vice versa; (d) the words “include,” “includes” or “including” shall be deemed to be followed
by the words “without limitation”; (e) references to “$” or “dollar” or “US$” shall be references to United States dollars; (f) the word “or” is disjunctive but not necessarily exclusive;
(g) the words “writing”, “written” and comparable terms refer to printing, typing and other means of reproducing words (including electronic media) in a visible form; (h) the word “day” means calendar day
unless business day is expressly specified; (i) the word “extent” in the phrase “to the extent” means the degree to which a subject or other thing extends, and such phrase shall not mean simply “if”; (j) all
references to Articles, Sections, or Schedules are to Articles, Sections, and Schedules of this Agreement; and (k) all references to any law will be to such law as amended, supplemented or otherwise modified or
re-enacted from time to time. 
 Section 4.9 Counterparts; Electronic Signatures. This
Agreement may be executed in one or more counterparts, each of which shall be deemed to be an original, but all of which shall constitute one and the same agreement. Delivery of an executed counterpart of a signature page to this Agreement by e-mail, electronic signature or scanned pages shall be effective as delivery of a manually executed counterpart to this Agreement. 

Section 4.10 Specific Performance. The parties hereto agree that irreparable damage would occur in the event any provision of this
Agreement was not performed in accordance with the terms hereof and that the parties shall be entitled to specific performance of the terms hereof, in addition to any other remedy at law or in equity. Each of the parties hereby further waives
(a) any defense in any action for specific performance that a remedy at law would be adequate and (b) any requirement under any law to post security or a bond as a prerequisite to obtaining equitable relief. 

  
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 Section 4.11 Amendment. This Agreement may not be amended except by an
instrument in writing signed by [(i) the Company, (ii) the Sponsor, and (iii) Holders // the Company, and Holders]7 holding at least a majority in interest of the then-outstanding number
of shares held by all Holders (provided the Holders or their Permitted Transferees hold such shares at the time of such amendment). 

Section 4.12 Waiver. At any time, (i) the Company may (a) extend the time for the performance of any obligation or other
act of any Holder, (b) waive any inaccuracy in the representations and warranties of any Holder contained herein or in any document delivered by such Holder pursuant hereto and (c) waive compliance with any agreement of such Holder or any
condition to its own obligations contained herein. At any time, (i) the Holders may (a) extend the time for the performance of any obligation or other act of the Company, (b) waive any inaccuracy in the representations and warranties
of the Company contained herein or in any document delivered by the Company pursuant hereto and (c) waive compliance with any agreement of the Company or any condition to their own obligations contained herein. Any such extension or waiver
shall be valid only if set forth in an instrument in writing signed by the party or parties to be bound thereby. 
 [Remainder of page
intentionally left blank.] 
  

	7 	 Note to Form: Language for 180-day // 60-day lock-up period agreements, respectively. 

  
 7 

 IN WITNESS WHEREOF, each of the parties has executed this Agreement as of the date first
written above. 
  

			
	COMPANY:
		
	By:	 	  

	Name:	 	
	Title:	 	

 [Signature Page to Lock-up Agreement] 

 IN WITNESS WHEREOF, each of the undersigned has executed this Agreement as of the date first
written above. 
  

			
	HOLDER:
	Name:	 	
		
	By:	 	  

		 	Name:
		 	Title:

  

			
	Address for
	Notice:	 	  

	Telephone No.:	 	  

	Email Address:	 	

 [Signature Page to Lock-up Agreement]EX-10.4

 Exhibit 10.4 
  

			
	Date:	  	November 9, 2022
		
	To:	  	Blockchain Coinvestors Acquisition Corp. I, a Cayman Islands corporation (“Blockchain”), BCSA Merger Sub, Inc., a Delaware corporation (“Blockchain Merger Sub”), formed for the purpose of
effectuating the Business Combination (as defined below), Qenta Inc., a Delaware corporation (“Target”).
		
	Address:	  	 PO Box 1093, Boundary Hall
 Cricket Square,
Grand Cayman
 KY1-1102, Cayman Islands

		
	From:	  	Vellar Opportunity Fund SPV LLC—Series 5 (“Seller”)
		
	Re:	  	OTC Equity Prepaid Forward Transaction

 The purpose of this agreement (this “Confirmation”) is to confirm the terms and conditions of the transaction
(the “Transaction”) entered into between Seller, Blockchain, Blockchain Merger Sub and Target on the Trade Date specified below. The term “Counterparty” refers to Blockchain until the Business Combination (as
defined below), including the domestication referred to in the BCA (defined below), then to Blockchain Coinvestors Acquisition Corp. I, a Delaware corporation, as it may be renamed in connection with the Business Combination. Upon the closing of the
transactions contemplated by the BCA Blockchain Merger Sub will merge with and into Target with Target as the surviving entity as a wholly-owned subsidiary of Blockchain (the “Combined Company”). Certain terms of the
Transaction shall be as set forth in this Confirmation, with additional terms as set forth in a Pricing Date Notice (the “Pricing Date Notice”) in the form of Schedule A hereto. This Confirmation, together with the Pricing
Date Notice(s), constitutes a “Confirmation” and the Transaction constitutes a separate “Transaction” as referred to in the ISDA Form (as defined below). 

This Confirmation, together with the Pricing Date Notices, evidences a complete binding agreement between Seller, Blockchain, Blockchain Merger Sub and Target
as to the subject matter and terms of the Transaction to which this Confirmation relates and shall supersede all prior or contemporaneous written or oral communications with respect thereto. 

The 2006 ISDA Definitions (the “Swap Definitions”) and the 2002 ISDA Equity Derivatives Definitions (the “Equity
Definitions”, and with the Swap Definitions, the “Definitions”), each as published by the International Swaps and Derivatives Association, Inc., are incorporated into this Confirmation. If there is any inconsistency between
the Definitions and this Confirmation, this Confirmation governs. If, in relation to the Transaction to which this Confirmation relates, there is any inconsistency between the ISDA Form, this Confirmation (including the Pricing Date Notice), the
Swap Definitions and the Equity Definitions, the following will prevail for purposes of such Transaction in the order of precedence indicated: (i) this Confirmation (including the Pricing Date Notice(s)); (ii) the Equity Definitions;
(iii) the Swap Definitions, and (iv) the ISDA Form. 
 This Confirmation, together with the Pricing Date Notice, shall supplement, form a part of,
and be subject to an agreement in the form of the 2002 ISDA Master Agreement (the “ISDA Form”) as if Seller, Target and Counterparty had executed an agreement in such form (but without any Schedule except as set forth herein under
“Schedule Provisions”) on the Trade Date of the Transaction. 

 The terms of the particular Transaction to which this Confirmation relates are as follows: 

General Terms 
  

			
	Type of Transaction:	  	Share Forward Transaction
		
	Trade Date:	  	November 9, 2022
		
	Pricing Date:	  	As specified in the Pricing Date Notice.
		
	Effective Date:	  	One (1) Settlement Cycle following the Pricing Date.
		
	Valuation Date:	  	The earliest to occur of (a) the third anniversary of the closing of the transactions between Counterparty and Target pursuant to an Business Combination Agreement, as may be entered into on or after the date hereof (the
“BCA”), by and among Counterparty, the Target and certain other parties thereto, to be reported on a Form 8-K (or Form 6-K (if applicable)) filed by the
Counterparty (the “Form 8-K”) (the “Business Combination”), (b) the date specified by Counterparty in a written notice to be delivered to Seller at Counterparty’s
discretion (not earlier than the day such notice is effective) after the occurrence of a Counterparty VWAP Trigger Event; provided that if the Counterparty elects to deliver Maturity Shares, the Share Conditions are satisfied and (c) the date
specified by Seller in a written notice to be delivered to Counterparty at Seller’s discretion (not earlier than the day such notice is effective) after the occurrence of any of a (x) Seller VWAP Trigger Event, (y) a Registration
Failure or (z) a Delisting Event (in each case the “Maturity Date”).
		
	Counterparty Trigger Event:	  	An event that occurs if the VWAP Price is at or above $13.00 per share for any 20 trading days during a 30 consecutive trading day-period and the aggregate trading volume in respect of the
Shares during the same 20-day period is at least the product of (a) three (3) and (b) the difference of (x) the Number of Shares and (y) Terminated Shares.
		
	Seller VWAP Trigger Event	  	An event that occurs if the VWAP Price is at or below $3.50 per share for any 20 trading days during a 30 consecutive trading day-period.
		
	VWAP Price:	  	For any scheduled trading day, the Rule 10b-18 volume weighted average price per Share for such day as reported on the relevant Bloomberg Screen “[ ] <Equity> AQR SEC” (or any
successor thereto), or if such price is not so reported on such trading day for any reason or is erroneous, the VWAP Price shall be as reasonably determined by the Calculation Agent.
		
	Dilutive Offering Reset	  	To the extent the Counterparty, after the date hereof, sells, enters any agreement to sell or grants any right to reprice, or otherwise dispose of or issues (or announce any offer, sale, grant or any option to purchase or other
disposition) any Shares or any securities of the Counterparty or any of their respective subsidiaries which would entitle the holder thereof to acquire at any time Shares, including, without limitation, any debt, preferred stock, right, option,
warrant or other instrument that is at any time convertible into or exercisable or exchangeable for, or otherwise entitles the holder thereof to receive, Shares, at an effective price per share less than the then existing Reset Price then the Reset
Price shall be modified to equal such reduced price. This provision shall not apply to any grants or issuances under the Counterparty’s equity compensation plans that have been publicly disclosed by the Counterparty or any grants or issuances
under the Target’s equity compensation plans, or the issuance of Shares after the Business Combination to Target securityholders as additional consideration in connection with Target’s issuance of securities for capital raising purposes
prior to the Business Combination.

  
 2 

			
		
	Reset Price	  	The Reset Price shall be adjusted on the first scheduled trading day of each month (each a “Reset Date”) commencing on the first calendar month following the closing of the Business Combination to be the lowest of
(a) the then-current Reset Price, (b) $10.00 and (c) the VWAP Price of the Shares of the last ten (10) trading days of the prior calendar month, but not lower than $5.00; provided that the Reset Price may be further reduced pursuant
to a Dilutive Offering Reset.
		
	Seller:	  	Seller.
		
	Buyer:	  	Counterparty.
		
	Shares:	  	Prior to the closing of the Business Combination, the Class A ordinary shares, par value $0.0001 per share, of Blockchain (Ticker: “BCSA”) and, after the closing of the Business Combination, the shares of
Blockchain. Seller will hold the Recycled Shares and the Additional Shares (together with the Recycled Shares, the “Subject Shares”) in a bankruptcy remote special purpose vehicle for the benefit of Counterparty.
		
	Number of Shares:	  	The sum of (a) the number of Recycled Shares and (b) the number of Additional Shares, as specified in the Pricing Date Notice(s), but in no event more than the Maximum Number of Shares. The Number of Shares is subject to
reduction only as described under “Optional Early Termination”.
		
	Maximum Number of Shares:	  	12,000,000 Shares.
		
	Initial Price:	  	The Per-Share Redemption Price (the “Redemption Price”) as defined in Section 51.5 of the Amended and Restated Memorandum and Articles of Association of Counterparty,
effective as of November 9, 2021, as amended from time to time (the “Certificate of Incorporation”); provided that the Counterparty agrees and covenants to publicly disclose at least two (2) days prior to the expiration of
the Counterparty’s redemption offer the estimated Redemption Price as of the same date.
		
	Recycled Shares:	  	The number of Shares purchased by Seller from third parties (other than Counterparty) through a broker in the open market (other than through Counterparty); provided that Seller shall have irrevocably waived all redemption rights
with respect to such Shares as provided below in the section captioned “Transactions by Seller in the Shares.” Seller shall specify the number of Recycled Shares (the “Number of Recycled Shares”) in the initial Pricing
Date Notice.
		
	Additional Shares:	  	Additional Shares may be purchased at any time prior to the Maturity Date by Seller, in Seller’s sole discretion, from the Counterparty, with such number of Shares to be specified in a Pricing Date Notice(s) as Additional
Shares; provided that such number of Additional Shares that may be purchased from the Counterparty shall not exceed the difference of (x) the Maximum Number of Shares and (y) the Recycled Shares; provided further that such number of
Additional Shares included in a Pricing Date Notice shall be promptly issued to Seller in its name free and clear of all liens (other than those under any federal or state securities laws) and that the final form of the purchase of the Additional
Shares is mutually agreed by Seller and Counterparty.

  
 3 

			
		
	Prepayment:	  	Applicable. Payment of the Prepayment Amount shall be made directly from the Counterparty’s Trust Account maintained by Continental Stock Transfer and Trust Company holding the net proceeds of the sale of the units in
Counterparty’s initial public offering and the sale of private placement units (the “Trust Account”) no later than the Prepayment Date. Counterparty shall provide (a) notice to Counterparty’s trustee of the entrance
into this Confirmation no later than one (1) Local Business Day following the date hereof, with copy to Seller and Seller’s outside legal counsel, and (b) to Seller and Seller’s outside legal counsel a final draft of the flow of
funds from the Trust Account prior to the closing of the Business Combination itemizing the Prepayment Amount due to Seller; provided that Seller shall be invited to attend any closing call in connection with the Business Combination.
		
	Prepayment Amount:	  	A cash amount equal to (x) (i) the Number of Recycled Shares underlying the Transaction as set forth on the initial Pricing Date Notice, multiplied by (ii) the Redemption Price less (y) the Prepayment
Shortfall.
		
	Prepayment Date:	  	Subject to Counterparty receiving the initial Pricing Date Notice, the earlier of (a) one (1) Local Business Day after the closing of the Business Combination and (b) the date any assets from the Trust Account are
disbursed in connection with the Business Combination.
		
	Variable Obligation:	  	Not applicable.
		
	Prepayment Shortfall	  	An amount in USD equal to 10% of the product of the Number of Shares and the Redemption Price; provided that Seller shall pay the Prepayment Shortfall to Counterparty on the Prepayment Date (which amount shall be netted from the
Prepayment Amount) unless a Registration Request has been requested by Seller then on the Registration Statement Effective Date.
		
	Prepayment Shortfall Consideration	  	Seller in its sole discretion may sell Subject Shares at any time and at any sales price, without payment by Seller of any Early Termination Obligation (as defined below) until such time as the proceeds from the such sales equal
100% of the Prepayment Shortfall (as set forth under Shortfall Sales below) (such sales, “Shortfall Sales,” and such Shares, “Shortfall Sale Shares”). Any sales of Subject Shares by Seller that result in proceeds in
excess of 100% of the Prepayment Shortfall shall constitute an Optional Early Termination for purposes hereof. Seller may designate any sale of Shares as either a “Shortfall Sale,” subject to the terms and conditions herein applicable to
Shortfall Sale Shares, by delivering a Shortfall Sale Notice as required hereunder, or an Optional Early Termination, subject to the terms and conditions herein applicable to Terminated Shares, by delivering an OET Notice as required
hereunder.
		
	Exchanges	  	Nasdaq Global Market
		
	Related Exchange(s)	  	All Exchanges

  
 4 

			
		
	Break-up Fees:	  	A break-up fee equal to (i) all of Seller’s actual out-of-pocket reasonable fees, costs and expenses
relating to the Transaction in an amount not to exceed $75,000 plus (ii) $350,000 (collectively, the “Break-up Fee”) shall be payable, jointly and severally, by the Counterparty and the Target
to the Seller in the event this Confirmation or Transaction is terminated by either the Counterparty or the Target; provided that Counterparty and Target may terminate this Transaction, including the Confirmation, with no liability to Seller, if
(a) redemptions (including as redemptions such Shares that were tendered for redemption and then unredeemed to be purchased in connection with the transactions contemplated hereunder) are less than 80% as calculated in good faith by the board
of directors of Counterparty (based on the number of shares submitted for redemption as the numerator and the total issued and outstanding shares as the denominator calculated as a percentage) upon written notice to Seller certifying the same no
later than the Counterparty’s redemption deadline (two days prior to the shareholder vote) and (b) upon any Additional Termination Event; provided that notwithstanding any other provision, clause or proviso (including the immediately
preceding proviso) of this Confirmation, this Transaction, including the Confirmation may not be terminated by Counterparty or Target after Seller purchases any Subject Shares after the redemption deadline; provided further that Seller hereby waives
any and all right, title and interest, or any claim of any kind they have or may have, in or to any monies held in the Counterparty’s Trust Account and agrees not to seek recourse against the Trust Account, in each case, as a result of, or
arising out of, this Transaction; provided, however, that nothing in the foregoing waiver shall (x) serve to limit or prohibit Seller’s right to pursue a claim against the Counterparty for legal relief against assets held outside the Trust
Account, for specific performance or other equitable relief, (y) serve to limit or prohibit any claims that the Seller may have in the future against the Counterparty’s assets or funds that are not held in the Trust Account (including any
funds that have been released from the Trust Account and any assets that have been purchased or acquired with any such funds), (z) be deemed to limit Seller’s right, title, interest or claim to the Trust Account by virtue of such Seller’s
record or beneficial ownership of securities of the Counterparty acquired by any means other than pursuant to this Transaction or (aa) serve to limit Seller’s redemption right with respect to any such securities of the Seller other than during
the term of this Confirmation. The Breakup Fee is not intended to constitute a liquidated damages provision, and it will be payable in addition to any other amount due and payable to Seller as a result of the occurrence of an Early Termination Date
under the ISDA Master Agreement.
		
	Payment Dates:	  	Following the Business Combination the last day of each calendar month or, if such date is not a Local Business Day, the next following Local Business Day, until the Maturity Date.
		
	Reimbursement of Legal Fees and Other Expenses:	  	Together with the Prepayment Amount, Counterparty shall pay to Seller an amount equal to the reasonable attorney fees and other reasonable out-of-pocket
expenses related thereto actually incurred by Seller or its affiliates in connection with this Transaction not to exceed (a) $75,000 and (b) expenses actually incurred in connection with the acquisition of the Shares in an amount not to exceed
$0.05 per Share.

  
 5 

			
		
	Settlement Terms	  	
		
	Settlement Method Election:	  	Not Applicable.
		
	Settlement Method:	  	Physical Settlement.
		
	Settlement Currency:	  	USD.
		
	Settlement Date:	  	Two (2) Local Business Days following the Valuation Date.
		
	Excess Dividend Amount	  	Ex Amount.
		
	Optional Early Termination:	  	From time to time and on any date following the Business Combination (any such date, an “OET Date”) and subject to the terms and conditions below, Seller may, in its absolute discretion, terminate the Transaction in
whole or in part so long as Seller provides written notice to Counterparty (the “OET Notice”), no later than the later of (a) the third Local Business Day following the OET Date and (b) the first Payment Date after the OET
Date which shall specify the quantity by which the Number of Shares is to be reduced (such quantity, the “Terminated Shares”) provided that “Terminated Shares includes only such quantity of Shares by which the Number of Shares
is to be reduced and included in an OET Notice and does not include any Shortfall Sale Shares or sales of Shares that are designated as Shortfall Sales (which designation can be made only up to the amount of Shortfall Sale Proceeds), which Shares
will not be included in any OET Notice or included in the definition, or when calculating the number, of Terminated Shares. Notwithstanding anything to the contrary contained herein, Seller shall terminate the Transaction in respect of any Shares
sold by it on or prior to the Maturity Date, and Seller shall be obligated to deliver an OET Notice or Shortfall Sales Notice, as the case may be, in respect of any Shares sold prior to the Maturity Date. The effect of an OET Notice given shall be
to reduce the Number of Shares by the number of Terminated Shares specified in such OET Notice with effect as of the related OET Date. As of each OET Date, Counterparty shall be entitled to an amount from Seller, and the Seller shall pay to
Counterparty an amount, equal to the product of (x) the number of Terminated Shares and (y) the Reset Price in respect of such OET Date (an “Early Termination Obligation”), except that no such amount will be due to
Counterparty upon any Shortfall Sale; provided that Seller shall pay certain of the Early Termination Obligation to the accounts and in the amounts as directed by Counterparty. The remainder of the Transaction, if any, shall continue in accordance
with its terms; provided that if the OET Date is also the stated Valuation Date, the remainder of the Transaction shall be settled in accordance with the other provisions of “Settlement Terms.” Seller shall pay to Counterparty any and all
unsatisfied Early Termination Obligations, calculated as of the last day of each calendar month, on the first Local Business Day following such day; provided that Seller shall be under no obligation to settle an Early Termination Obligation set
forth in an OET Notice prior to one (1) Local Business Day following the settlement of the Share sale(s) covered in such OET notice.
		
	Shortfall Sales	  	From time to time and on any date following the Business Combination (any such date, a “Shortfall Sale Date”) and subject to the terms and conditions below, Seller may, in its absolute discretion, at any sales
price, sell Shortfall Sale Shares, and in connection with such sales,

  
 6 

			
		  	Seller shall provide written notice to Counterparty (the “Shortfall Sale Notice”) no later than the later of (a) the third Local Business Day following the Shortfall Sales Date and (b) the first Payment
Date after the Shortfall Sales Date, specifying the quantity of the Shortfall Sale Shares and the allocation of the Shortfall Sale Proceeds. Seller shall not have any Early Termination Obligation in connection with any Shortfall Sales. The
Counterparty covenants and agrees for a period of at least sixty (60) Local Business Days not to publicly issue, sell or offer or publicly agree to sell any Shares, or securities or debt that is convertible, exercisable or exchangeable into
Shares, including under any existing or future equity line of credit (collectively, “Private Sale Transactions”), until the Shortfall Sales equal the Prepayment Shortfall, other than (w) grants or issuances under the
Counterparty’s equity compensation plans that have been publicly disclosed by the Counterparty, (x) securities issued as contemplated by the BCA, and (y) Shares issued in exercise of securities or debt that is convertible, exercisable
or exchangeable into Shares on the date on the Trade Date and publicly disclosed; provided that Counterparty shall cause any securities or derivative securities that may be issued or sold pursuant to such Private Sale Transactions to not be sold,
resold or transferred publicly, including on or through an exchange during the sixty (60) Local Business Day period referenced above.
		
	Maturity Consideration:	  	The “Maturity Consideration” means an amount equal to the product of (1) the Maximum Number of Shares less the number of Terminated Shares multiplied and (2) $1.75. In the event the Maturity Date is determined
by clause (a) or (c) of Valuation Date, on such Maturity Date, Seller shall be entitled to receive the Maturity Consideration in cash or, at the option of Counterparty (other than in the case of a Delisting Event), Shares based on the average
daily VWAP Price over 30 scheduled trading days ending on the Maturity Date (such shares to be paid as Maturity Consideration, the “Maturity Shares”); provided that the Maturity Shares used to pay the Maturity Consideration
(i) (a) are registered for resale under an effective registration statement pursuant to the Securities Act of 1933, as amended (the “Securities Act”) under which Seller may sell or transfer the Shares or (b) may be transferred by
Seller without any restrictions including the requirement for the Counterparty to be in compliance with the current public information required under Rule 144(c)(1) (or Rule 144(i)(2)) or the volume and manner of sale limitations under Rule 144
under the Securities Act and (ii) bear no restrictive legend (collectively, (i) and (ii) above, the “Share Conditions”); provided further that if the Maturity Shares do not satisfy the Share Conditions, Seller shall
instead receive such number of Shares equal to the product of (a) three (3) and (b) the Maximum Number of Shares minus the Terminated Shares (the “Penalty Shares”); provided further that if the Penalty Shares satisfy the
Share Conditions within 120 days after the Maturity Date, Seller shall return to Counterparty such number of Penalty Shares that are valued in excess of Maturity Consideration based on the 10-day VWAP ending
on date that such Shares satisfied the Share Conditions. Counterparty, at Sellers’s option, will pay the Maturity Consideration on a net basis such that Seller retains a number of shares due to Counterparty upon the Maturity Date equal to the
number of Maturity Shares or Penalty Shares payable to Seller, only to the extent the Number of Shares due to Counterparty upon the Maturity Date are equal to or more than the number of Maturity Shares or Penalty
Shares

  
 7 

			
		  	payable to Seller, with any Maturity Consideration remaining due to be paid to Seller in newly issued Shares. For the avoidance of doubt, in addition to the Maturity Consideration, at the Maturity Date, Seller will be entitled to
retain the Prepayment Amount. In the event that the Maturity Date is determined by clause (b) of the Valuation Date, on such Maturity Date, Seller shall not be entitled to receive the Maturity Consideration.
		
	Additional Consideration:	  	In addition to the Prepayment Amount, Seller shall pay directly from the Trust Account on the Prepayment Date, an amount equal to the product of 500,000 multiplied by the Redemption Price, for the purpose of repayment of Seller
having purchased, prior to the closing of the Business Combination, 500,000 Shares from third parties in the open market through a broker in connection with the Share Consideration, which Shares (the “Additional Purchased Shares”)
shall not be included in the Number of Shares in this Transaction, and shall be free and clear of all obligations of Seller in connection with this Confirmation.
		
	Share Registration	  	At the written request of Seller and no earlier than the Counterparty’s redemption deadline (the “Registration Request”), within thirty (30) calendar days of the Registration Request, Counterparty shall
file (at Counterparty’s sole cost and expense) with the U.S. Securities and Exchange Commission (the “Commission”) a registration statement registering the resale of all shares held by the Seller and its affiliates, including
the Recycled Shares, the Additional Shares and the Share Consideration Shares (the “Registration Statement”), and have the Registration Statement declared effective as soon as practicable after the filing thereof, but no later than
the earliest of (i) the 60th calendar day (or 105th calendar day if the Commission notifies the Counterparty that it will “review” the Registration Statement) following the Registration Request and (ii) the 5th Local Business Day
after the date the Counterparty is notified (orally or in writing, whichever is earlier) by the Commission that such Registration Statement will not be “reviewed” or will not be subject to further review. Upon notification by the
Commission that the Registration Statement has been declared effective by the Commission, within two (2) Local Business Days thereafter, the Counterparty shall file the final prospectus under Rule 424 of the Securities Act of 1933, as amended
containing a “plan of distribution” reasonably acceptable to the Seller. In no event shall Counterparty identify Seller as a statutory underwriter in the Registration Statement unless requested by the Commission. The Counterparty will use
its best efforts to keep the Registration Statement covering the resale of the shares as described above continuously effective (except for customary blackout periods, up to twice per year and for a total of up to 15 calendar days (and not more than
10 calendar days in an occurrence), if and when the Counterparty is in possession of material non-public information the disclosure of which, in the good faith judgment of the Counterparty’s board of
directors, would be prejudicial, and the Counterparty agrees to promptly notify Seller of any such blackout determination) until all such shares have been sold or may be transferred without any restrictions including the requirement for the
Counterparty to be in compliance with the current public information required under Rule 144(c)(1) (or Rule 144(i)(2) or the volume and manner of sale limitations under Rule 144 under the Securities Act; provided that Counterparty covenants and
agrees to

  
 8 

			
		  	make all necessary filings, amendments, supplements and submissions in furtherance of the foregoing, including to register all of Seller’s Shares for resale. The Seller may, at its sole discretion, accelerate the Maturity Date
(and payment of the Maturity Consideration, including the Penalty Shares (if applicable)) by written notice to the Counterparty at any time, if (a) the Registration Statement covering all of the shares described above in this section is not
declared effective after the 60th calendar day (or 105th calendar day if the Commission notifies the Counterparty that it will “review” the Registration Statement) after the Registration Request) or (b) the Registration Statement
after it is declared effective ceases to be continuously effective (subject to the blackout periods as indicated above) as set forth in the preceding sentence for more than 15 consecutive calendar days ((a) and (b) together, collectively, a
“Registration Failure”). Seller will promptly deliver customary representations and other documentation reasonably acceptable to the Counterparty, its counsel and/or its transfer agent in connection with the Registration Statement,
including those related to selling shareholders and to respond to Commission comments If requested by Seller, the Counterparty shall remove or instruct its transfer agent to remove any restrictive legend with respect to transfers under the
Securities Act from any and all Shares held by Seller if (1) the Registration Statement is and continues to be effective under the Securities Act, (2) such Shares are sold or transferred pursuant to Rule 144 under the Securities Act
(subject to all applicable requirements of Rule 144 being met), or (3) such Shares are eligible for sale under Rule 144, without the requirement for the Counterparty to be in compliance with the current public information required under Rule
144(c)(1) (or Rule 144(i)(2), if applicable) as to the Shares and without volume or manner-of-sale restrictions; provided that Seller shall have timely provided
customary representations and other documentation reasonably acceptable to the Counterparty, its counsel and/or its transfer agent in connection therewith. Any fees (with respect to the transfer agent, Counterparty’s counsel or otherwise)
associated with the issuance of any legal opinion required by the Counterparty’s transfer agent or the removal of such legend shall be borne by the Counterparty. If a legend is no longer required pursuant to the foregoing, the Counterparty
will, no later than five (5) Local Business Days following the delivery by Seller to the Counterparty or the transfer agent (with notice to the Counterparty) of customary representations and other documentation reasonably acceptable to the
Counterparty, its counsel and/or its transfer agent, remove the restrictive legend related to the book entry account holding the Shares and make a new, unlegended book entry for the Shares. Consistent with the foregoing, the Seller and the
Counterparty agree to enter into a separate registration rights agreement providing for customary demand and piggyback registration rights and customary indemnification of the Seller.
		
	Share Adjustments:	  	
		
	Method of Adjustment: 	  	Calculation Agent Adjustment.
		
	Extraordinary Events:	  	
		
	Consequences of Merger Events involving Counterparty:	  	
		
	Share-for-Share:	  	Calculation Agent Adjustment.

  
 9 

			
		
	Share-for-Other:	  	Cancellation and Payment.
		
	Share-for-Combined:	  	Component Adjustment.
		
	Tender Offer:	  	Applicable; provided, however, that Section 12.1(d) of the Equity Definitions is hereby amended by adding “, or of the outstanding Shares,” before “of the Issuer” in the fourth line thereof. Sections
12.1(e) and 12.1(l)(ii) of the Equity Definitions are hereby amended by adding “or Shares, as applicable,” after “voting Shares”.
		
	Consequences of Tender Offers:	  	
		
	Share-for-Share: 	  	Calculation Agent Adjustment.
		
	Share-for-Other:	  	Calculation Agent Adjustment.
		
	Share-for-Combined:	  	Calculation Agent Adjustment.
		
	Composition of Combined Consideration:	  	Not Applicable.
		
	Nationalization, Insolvency or Delisting:	  	Cancellation and Payment (Calculation Agent Determination); provided that in addition to the provisions of Section 12.6(a)(iii) of the Equity Definitions, it shall also constitute a Delisting if the Exchange is located in the
United States and the Shares are not immediately re-listed, re-traded or re-quoted on any of the New York Stock Exchange, the
Nasdaq Global Select Market, Nasdaq Capital Market or the Nasdaq Global Market (or their respective successors) or such other exchange or quotation system which, in the determination of the Calculation Agent, has liquidity comparable to the
aforementioned exchanges; if the Shares are immediately re-listed, re-traded or re-quoted on any such exchange or quotation
system, such exchange or quotation system shall be deemed to be the Exchange.
		
	Business Combination Exclusion:	  	Notwithstanding the foregoing or any other provision herein, the parties agree that the Business Combination shall not constitute a Merger Event, Tender Offer, Delisting or any other Extraordinary Event hereunder.
		
	Additional Disruption Events:	  	
		
	(a) Change in Law: 	  	Applicable; provided that Section 12.9(a)(ii) of the Equity Definitions is hereby amended by adding the words “(including, for the avoidance of doubt and without limitation, adoption or promulgation of new
regulations authorized or mandated by existing statute)” after the word “regulation” in the second line thereof.
		
	(a) Failure to Deliver:	  	Not Applicable.
		
	(b) Insolvency Filing:	  	Applicable.
		
	(c) Hedging Disruption:	  	Not Applicable.
		
	(d) Increased Cost of Hedging:	  	Not Applicable.
		
	(e) Loss of Stock Borrow:	  	Not Applicable.

  
 10 

			
		
	(f) Increased Cost of Stock Borrow:	  	Not Applicable.
		
	Determining Party:	  	For all applicable events, Seller, unless (i) an Event of Default, Potential Event of Default or Termination Event has occurred and is continuing with respect to Seller, or (ii) if Seller fails to perform its obligations
as Determining Party, in which case a Third Party Dealer (as defined below) in the relevant market selected by Counterparty will be the Determining Party.
		
	Additional Provisions:	  	
		
	Calculation Agent:	  	Seller, unless (i) an Event of Default, Potential Event of Default or Termination Event has occurred and is continuing with respect to Seller, or (ii) if Seller fails to perform its obligations as Calculation Agent, in
which case an unaffiliated leading dealer in the relevant market selected by Counterparty in its sole discretion will be the Calculation Agent.
		
		  	In the event that a party (the “Disputing Party”) does not agree with any determination made (or the failure to make any determination) by the Calculation Agent, the Disputing Party shall have the right to require
that the Calculation Agent have such determination reviewed by a disinterested third party that is a dealer in derivatives of the type that is the subject of the dispute and that is not an Affiliate of either party (a “Third Party
Dealer”). Such Third Party Dealer shall be jointly selected by the parties within one (1) Local Business Day after the Disputing Party’s exercise of its rights hereunder (once selected, such Third Party Dealer shall be the
“Substitute Calculation Agent”). If the parties are unable to agree on a Substitute Calculation Agent within the prescribed time, each of the parties shall elect a Third Party Dealer and such two dealers shall agree on a Third Party
Dealer by the end of the subsequent Local Business Day. Such Third Party Dealer shall be deemed to be the Substitute Calculation Agent. Any exercise by the Disputing Party of its rights hereunder must be in writing and shall be delivered to the
Calculation Agent not later than the third Local Business Day following the Local Business Day on which the Calculation Agent notifies the Disputing Party of any determination made (or of the failure to make any determination). Any determination by
the Substitute Calculation Agent shall be binding in the absence of manifest error and shall be made as soon as possible but no later than the second Local Business Day following the Substitute Calculation Agent’s appointment. The costs of such
Substitute Calculation Agent shall be borne by (a) the Disputing Party if the Substitute Calculation Agent substantially agrees with the Calculation Agent or (b) the non-Disputing Party if the
Substitute Calculation Agent does not substantially agree with the Calculation Agent. If, after following the procedures and within the specified time frames set forth above, a binding determination is not achieved, the original determination of the
Calculation Agent shall apply.
		
	Non-Reliance:	  	Applicable.
		
	Agreements and Acknowledgements Regarding Hedging Activities:	  	Applicable.
		
	Additional Acknowledgements:	  	Applicable.

  
 11 

			
	Schedule Provisions:	  	
		
	Specified Entity:	  	In relation to both Seller and Counterparty for the purpose of:
		
		  	Section 5(a)(v), Not Applicable
		  	Section 5(a)(vi), Not Applicable
		  	Section 5(a)(vii), Not Applicable
		
	Cross-Default	  	The “Cross-Default” provisions of Section 5(a)(vi) of the ISDA Form will not apply to either party.
		
	Credit Event Upon Merger	  	The “Credit Event Upon Merger” provisions of Section 5(b)(v) of the ISDA Form will not apply to either party.
		
	Automatic Early Termination:	  	The “Automatic Early Termination” of Section 6(a) of the ISDA Form will not apply to either party.
		
	Termination Currency:	  	United States Dollars.
		
	Additional Termination Events:	  	Will apply to Seller and to Counterparty and Target. The occurrence of any of the following events shall constitute an Additional Termination Event in respect of which Seller and Counterparty and Target shall be Affected
Parties:
		
		  	(a) The Business Combination fails to close on or before the Outside Date (as defined in the BCA) (as such Outside Date may be amended or extended from time to time); and
		
		  	(b) The BCA is terminated pursuant to its terms prior to the closing of the Business Combination.
		
		  	Notwithstanding the foregoing, Counterparty’s obligations set forth under the captions, “Reimbursement of Legal Fees and Expenses,” and “Other Provisions — (d) Indemnification” shall survive any
termination due to the occurrence of either of the foregoing Additional Termination Events.
		
	Governing Law:	  	New York law (without reference to choice of law doctrine).
		
	Credit Support Provider:	  	With respect to Seller and Counterparty, None.
		
	Local Business Days:	  	Seller specifies the following places for the purposes of the definition of Local Business Day as it applies to it: New York. Counterparty specifies the following places for the purposes of the definition of Local Business Day as it
applies to it: New York.

 Representations, Warranties and Covenants 

 

	1.	 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): 

 

	(a)	 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 

  
 12 

	 	
communication (written or oral) of the other party as investment advice or as a recommendation to enter into the Transaction, it being understood that information and explanations related to the
terms and conditions of the Transaction will not be considered investment advice or a recommendation to enter into the Transaction. No communication (written or oral) received from the other party will be deemed to be an assurance or guarantee as to
the expected results of the Transaction. 

  

	(b)	 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. 

 

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

  

	(d)	 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). 

  

	(e)	 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. 

  

	(f)	 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. 

  

	(g)	 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. 

  

	(h)	 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. 

  

	(i)	 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. 

  

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

  

	(a)	 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. 

  

	(b)	 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. 

  

	(c)	 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 

  
 13 

	 	
under the Transaction, (a) it has not violated and will not violate any relevant state law provision applicable to the acquisition or redemption by an issuer of its own securities and
(b) it would not be nor would it be rendered “insolvent” (as such term is defined under Section 101(32) of the Bankruptcy Code or under any other applicable local insolvency regime). 

 

	(d)	 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. 

  

	(e)	 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. 

  

	(f)	 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. 

 

	(g)	 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. 

  

	(h)	 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. 

  

	(i)	 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. 

 

	(j)	 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. 

  

	(k)	 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

  
 14 

	 	
day immediately following dates referenced in the preceding sentence, engage in any such distribution. Counterparty, including Target, also agrees and covenants that the BCA shall be executed and
all required approvals and consents of the Target security holders in connection with the Business Combination shall be obtained and any subsequent valuation periods as contemplated under Regulation M under the Exchange Act, shall be completed in
each case no later than Blockchain’ redemption deadline. 

  

	(l)	 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. 

 

	(m)	 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. 

  

	3.	 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: 

  

	(a)	 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. 

  

	(b)	 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). 

  
 15 

 Transactions by Seller in the Shares 

 

	(a)	 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.

  

	(b)	 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. 

No Arrangements 
 Seller, Counterparty and Target
each acknowledge and agree that: (i) there are no voting, hedging or settlement arrangements between or among Seller, Counterparty and Target with respect to any Shares or the Counterparty or Target, other than those set forth herein;
(ii) although Seller may hedge its risk under the Transaction in any way Seller determines, Seller has no obligation to hedge with the purchase, sale or maintenance of any Shares or otherwise; (iii) Counterparty and Target will not be
entitled to any voting rights in respect of any of the Shares underlying the Transaction; and (iv) Counterparty and Target will not seek to influence Seller with respect to the voting or disposition of any Shares. 

Wall Street Transparency and Accountability Act 

In connection with Section 739 of the Wall Street Transparency and Accountability Act of 2010 (“WSTAA”), the parties hereby agree that
neither the enactment of WSTAA or any regulation under WSTAA, nor any requirement under WSTAA or an amendment made by WSTAA, nor any similar legal certainty provision in any legislation enacted, or rule or regulation promulgated, on or after the
date of this Confirmation, shall limit or otherwise impair either party’s otherwise applicable rights to terminate, renegotiate, modify, amend or supplement this Confirmation or the ISDA Form, as applicable, arising from a termination event,
force majeure, illegality, increased costs, regulatory change or similar event under this Confirmation, the Equity Definitions incorporated herein, or the ISDA Form. 

Address for Notices 
 Notice to Seller: 

3 Columbus Circle 
 24th Floor 
 New York, NY 10019 

With a copy to: 
 Seward & Kissel LLP 

One Battery Park Plaza 
 New York, NY 10004 

Attention: Keith Billotti 
 Email: billotti@sewkis.com 

Notice to Counterparty: 
 Blockchain Acquisition
Corp. I 
 PO Box 1093 Boundary Hall 
 Cricket Square, Grand
Cayman 
 KY1-1102, Cayman Islands 

With a copy to: 
 Perkins Coie LLP 

1120 NW Couch Street, 10th Floor 
 Portland, Oregon 97209 

  
 16 

 Attention: M. Christopher Hall 

Email: chall@perkinscoie.com 
 Following the Closing of the
Business Combination: 
 Qenta Inc. 
 777 Post Oak Blvd.
#430 
 Houston, TX 77056 
 Attention: Brent De Jong / Carlos
Garduño 
 Email: brent.dejong@qenta.com / legalnotices@qenta.com 

With a copy to: 
 Perkins Coie LLP 

1120 NW Couch Street, 10th Floor 
 Portland, Oregon 97209 

Attention: M. Christopher Hall 
 Email: chall@perkinscoie.com 

A copy of all OET Notices shall be sent by Seller to the following address: 

399 Park Avenue 

4th Floor 

New York, NY 10022 
 Attn: General Counsel 

Email: Project_EncryptAll_Ext@moelis.com; Tiffany.Lundquist@moelis.com 

Other Provisions. 
  

	(c)	 Rule 10b5-1. 

 

	 	(i)	 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. 

  

	 	(ii)	 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.

  

	 	(iii)	 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. 

  
 17 

	(d)	 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. 

 

	(e)	 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 

  
 18 

	 	
Transaction shall be delivered to Counterparty as if the Early Termination Date was the Valuation Date in respect of a Transaction having terms identical to the Transaction and a Number of Shares
equal to the number of Shares underlying the Terminated Portion. The “Section 16 Percentage” as of any day is the fraction, expressed as a percentage, as determined by Seller, (A) the numerator of which is
the number of Shares that Seller and each person subject to aggregation of Shares with Seller under Section 13 or Section 16 of the Exchange Act and rules promulgated thereunder and all persons who may form a “group” (within the
meaning of Rule 13d-5(b)(1) of the Exchange Act) with Seller directly or indirectly beneficially own (as defined under Section 13 or Section 16 of the Exchange Act and rules promulgated thereunder)
(the “Seller Group” ) and (B) the denominator of which is the number of Shares outstanding. 

 The “Share
Amount” as of any day is the number of Shares that Seller and any person whose ownership position would be aggregated with that of Seller and any group (however designated) of which Seller is a member (Seller or any such person or group, a
“Seller Person”) under any law, rule, regulation, regulatory order or organizational documents or contracts of Counterparty that are, in each case, applicable to ownership of Shares (“Applicable Restrictions”),
owns, beneficially owns, constructively owns, controls, holds the power to vote or otherwise meets a relevant definition of ownership under any Applicable Restriction, as determined by Seller in its sole discretion. 

The “Applicable Share Limit” means a number of Shares equal to (A) the minimum number of Shares that could give rise to reporting (other
than on Schedule 13D or 13G) or registration obligations or other requirements (including obtaining prior approval from any person or entity) of a Seller Person, or could result in an adverse effect on a Seller Person, under any Applicable
Restriction, as determined by Seller in its sole discretion, minus (B) 0.1% of the number of Shares outstanding. 
  

	(f)	 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 

  
 19 

	 	
threatened claim or any action, suit or proceeding arising therefrom, whether or not such Indemnified Party is a party thereto and whether or not such claim, action, suit or proceeding is
initiated or brought by or on behalf of Counterparty. Counterparty also agrees that no Indemnified Party shall have any liability to Counterparty or any person asserting claims on behalf of or in right of Counterparty in connection with or as a
result of any matter referred to in this Confirmation except to the extent that any losses, claims, damages, liabilities or expenses incurred by Counterparty result from such Indemnified Party’s breach of any covenant, representation or other
obligation in this Confirmation or the ISDA Form or from the gross negligence, willful misconduct or bad faith of the Indemnified Party or breach of any U.S. federal or state securities laws or the rules, regulations or applicable interpretations of
the Securities and Exchange Commission. The provisions of this paragraph shall survive the completion of the Transaction contemplated by this Confirmation and any assignment and/or delegation of the Transaction made pursuant to the ISDA Form or this
Confirmation shall inure to the benefit of any permitted assignee of Seller. 

  

	(g)	 Amendments to Equity Definitions. 

 

	 	(i)	 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 

  

	 	(ii)	 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,”; 

  

	(h)	 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. 

  

	(i)	 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. 

  

	(j)	 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. 

  

	(k)	 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 

  
 20 

	 	
Event of Default under the ISDA Form with respect to the other party to constitute a “contractual right” as described in the Bankruptcy Code, and (iii) each payment and delivery of
cash, securities or other property hereunder to otherwise constitute a “margin payment” or “settlement payment” and a “transfer” as defined in the Bankruptcy Code. 

 

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

Seller appoints as its Process Agent: None 
 Counterparty
appoints as its Process Agent: None. 
 [Signature page follows] 

  
 21 

 Please confirm that the foregoing correctly sets forth the terms of our agreement by executing a copy of
this Confirmation and returning it to us at your earliest convenience. 
  

			
	Very truly yours,
	
	VELLAR OPPORTUNITY FUND SPV LLC – SERIES 5
		
	By:	 	 /s/ Solomon Cohen

	Name:	 	Solomon Cohen
	Title:	 	Authorized Signatory

  

			
	Agreed and accepted by:
	
	BLOCKCHAIN ACQUISITION CORP. I
		
	By:	 	 /s/ Lou Kerner

	Name:	 	Lou Kerner
	Title:	 	CEO
	
	BCSA Merger Sub, Inc.
		
	By:	 	 /s/ Lou Kerner

	Name:	 	Lou Kerner
	Title:	 	President
	
	QENTA INC.
		
	By:	 	 /s/ Brent de Jong

	Name:	 	Brent de Jong
	Title:	 	Chairman

  
 [Signature Page to
Confirmation] 

 SCHEDULE A 

FORM OF PRICING DATE NOTICE 
 Date: [•],
2022 
 To: Blockchain Acquisition Corp. I (“Counterparty”) 

Address: [•] 
 Phone: [•] 

From: Vellar Opportunity Fund SPV LLC – Series 5 (“Seller”) 

Re: OTC Equity Prepaid Forward Transaction 
 1. This Pricing Date
Notice supplements, forms part of, and is subject to the Confirmation Re: OTC Equity Prepaid Forward Transaction dated as of [•], 2022 (the “Confirmation”) between Counterparty and Seller, as amended and supplemented from time to
time. All provisions contained in the Confirmation govern this Pricing Date Notice except as expressly modified below. 
 2. The purpose of this Pricing
Date Notice is to confirm certain terms and conditions of the Transaction entered into between Seller and Counterparty pursuant to the Confirmation. 

Pricing Date: [•], 2022 
 Number of Recycled Shares:
[•] 
 Number of Additional Shares: [•] (if any)

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