Document:

EX-10.1

 Exhibit 10.1 

SPONSOR LETTER AGREEMENT 

This Sponsor Letter Agreement (this “Sponsor Letter Agreement”) is dated as of November 10, 2022, by and among
Blockchain Coinvestors Acquisition Sponsors I LLC, a Delaware limited liability company (“Sponsor”), Blockchain Coinvestors Acquisition Corp. I, an exempted company incorporated in the Cayman Islands with limited liability, which
shall domesticate as a Delaware corporation in accordance with the Business Combination Agreement (such entity, including the continuing Delaware corporation, “BCSA”), and QENTA Inc., a Delaware corporation (the
“Company”). The Sponsor, BCSA and the Company shall be referred to herein from time to time collectively as the “Parties”. Capitalized terms used but not defined herein shall have the respective meanings ascribed to
such terms in the Business Combination Agreement (as defined below). 
 RECITALS 

WHEREAS, BCSA, the Company and certain other Persons party thereto entered into that certain Business Combination Agreement, dated as of the
date hereof (as it may be amended, restated or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”); and 

WHEREAS, as a condition and inducement to the willingness of BCSA and the Company to enter into the Business Combination Agreement, BCSA, the
Company and the Sponsor are entering into this Sponsor Letter Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the premises and the mutual promises contained herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Parties, each intending to be legally bound, hereby agree as follows: 
 1.
Agreement to Vote. Sponsor, in its capacity as a shareholder of BCSA and on behalf of itself, hereby irrevocably agrees, at any meeting of the shareholders of BCSA duly called and convened in accordance with the Governing Documents of BCSA,
whether or not adjourned and however called, including at the BCSA Shareholders Meeting or otherwise, and in any action by written consent of the shareholders of BCSA, (i) to vote, or cause to be voted, or execute and return, or cause to be
executed and returned, an action by written consent with respect to, as applicable, all of Sponsor’s BCSA Class B Shares and BCSA Class A Shares (if any) held of record or beneficially by Sponsor as of the date of this Sponsor Letter
Agreement, or to which Sponsor acquires record or beneficial ownership after the date hereof and prior to the Closing (collectively, the “Subject BCSA Equity Securities”) in favor of each of the Transaction Proposals, in each case,
to the extent Subject BCSA Equity Securities are entitled to vote thereon or consent thereto and (ii) when such meeting is held, appear at such meeting or otherwise cause the Subject BCSA Equity Securities to be counted as present thereat for
the purpose of establishing a quorum, (iii) to the fullest extent permitted under applicable Law, waive any dissenters, appraisal or other similar rights, whether such rights are afforded by law or contract, in respect of the transactions
contemplated by the Business Combination Agreement and the Ancillary Documents, including the Merger and the Domestication, and (iv) to vote against, or cause to be voted against, or withhold consent, or cause consent to be withheld, with
respect to, as applicable, any BCSA Competing Acquisition. 

 2. Waiver of Anti-Dilution Protection. Sponsor hereby (a) waives, subject to,
and conditioned upon, the occurrence of the Closing (for itself and for its successors, heirs and assigns), and (b) agrees not to assert or perfect, any rights to adjustment or other anti-dilution protections with respect to the rate that the
BCSA Class B Shares held by it convert into BCSA Class A Shares, including those set out in Article 17 of the Amended and Restated Memorandum and Articles of Association of BCSA (the “BCSA Articles”), in connection
with the transactions contemplated by the Business Combination Agreement or otherwise. BCSA hereby acknowledges and agrees to such waiver. Sponsor hereby acknowledges and agrees that upon the Domestication, each BCSA Class B Share will be
converted into one (1) share of common stock, par value $0.00001 per share, of BCSA (“BCSA Common Stock”) and following the Domestication, no provision of the Pre-Closing BCSA Governing
Documents, including Article 17 of the BCSA Articles, will be of any force or effect with respect to the shares of BCSA Common Stock.
 3.
Sponsor Share Adjustment. Sponsor hereby agrees that, upon and subject to the Closing, Sponsor shall irrevocably surrender to BCSA, all of the Sponsor Equity Securities other than the Retained Sponsor Equity Securities. 

(a) “Sponsor Equity Securities” means all of the BCSA Class B Shares and all of the BCSA units, with each unit (each, a
“BCSA Unit”) consisting of one BCSA Class A Share, and one-half of one redeemable warrant, each whole warrant (each, a “Warrant”) entitling the holder to purchase one
BCSA Class A Share at an exercise price of $11.50 per BCSA Class A Share, owned by the Sponsor as of the date hereof. 
 (b)
“Retained Sponsor Equity Securities” means (i) 10,000,000 BCSA Class B Shares and 1,322,000 BCSA Units, if the Redemption Shares are no greater than 15,000,000, (ii) 10,000,000 BCSA Class B Shares and 500,000 BCSA Units,
if the Redemption Shares are between 15,000,001 and 18,750,000, (iii) 9,500,000 BCSA Class B Shares if the Redemption Shares are between 18,750,001 shares and 22,500,000, (iv) 8,500,000 BCSA Class B Shares if the Redemption Shares are
between 22,500,001 and 26,250,000 or (v) 7,500,000 Class B BCSA Shares if the Redemption Shares are greater than 26,250,000. 
 (c)
“Redemption Shares” means the aggregate number of BCSA Class A Shares redeemed in the BCSA Shareholder Redemption (without giving effect to any shares purchased by Vellar under the Forward Purchase Agreement). 

4. Representations and Warranties of Sponsor. Sponsor represents and warrants, as of the date hereof to BCSA and the Company, as
follows: 
 (a) Sponsor is a limited liability company duly organized, validly existing and in good standing under the Laws of its
jurisdiction of organization. 
 (b) Sponsor has the requisite limited liability company power and authority to perform its covenants,
agreements and obligations hereunder (including, for the avoidance of doubt, those covenants, agreements and obligations hereunder that relate to the provisions of the Business Combination Agreement), and to consummate the transactions contemplated
hereby. The execution and delivery of this Sponsor Letter Agreement has been duly authorized by all necessary corporate (or other similar) action on the part of Sponsor. This Sponsor Letter Agreement has been duly and validly executed and delivered
by Sponsor and constitutes a valid, legal and binding agreement of Sponsor (assuming that this Sponsor Letter Agreement is duly authorized, executed and delivered by the other Parties hereto), enforceable against Sponsor in accordance with its terms
(subject to applicable bankruptcy, insolvency, reorganization, moratorium or other Laws affecting generally the enforcement of creditors’ rights and subject to general principles of equity). 

  
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 (c) No consent, approval or authorization of, or designation, declaration or filing with,
any Governmental Entity is required on the part of Sponsor with respect to Sponsor’s execution, delivery or performance of its covenants, agreements or obligations under this Sponsor Letter Agreement (including, for the avoidance of doubt,
those covenants, agreements and obligations under this Sponsor Letter Agreement that relate to the provisions of the Business Combination Agreement) or the consummation of the transactions contemplated hereby, except for any consents, approvals,
authorizations, designations, declarations, waivers or filings, the absence of which would not adversely affect the ability of Sponsor to perform, or otherwise comply with, any of its covenants, agreements or obligations hereunder in any material
respect. 
 (d) None of the execution or delivery of this Sponsor Letter Agreement by Sponsor, the performance by Sponsor of any of its
covenants, agreements or obligations under this Sponsor Letter Agreement (including, for the avoidance of doubt, those covenants, agreements and obligations under this Sponsor Letter Agreement that relate to the provisions of the Business
Combination Agreement) or the consummation of the transactions contemplated hereby will, directly or indirectly (with or without due notice or lapse of time or both) (i) result in any breach of any provision of Sponsor’s governing
documents, (ii) result in a violation or breach of, or constitute a default or give rise to any right of termination, Consent, cancellation, amendment, modification, suspension, revocation or acceleration under, any of the terms, conditions or
provisions of any Contract to which Sponsor is a party, (iii) violate, or constitute a breach under, any Order or applicable Law to which Sponsor or any of its properties or assets are bound or (iv) result in the creation of any Lien upon
the Subject BCSA Equity Securities, except, in the case of any of clauses (ii) through (iv) above, as would not adversely affect the ability of Sponsor to perform, or otherwise comply with, any of its covenants, agreements or obligations
hereunder in any material respect. 
 (e) Sponsor is the record and/or beneficial owner, as applicable, of the Subject BCSA Equity
Securities and has valid, good and marketable title to the Subject BCSA Equity Securities, free and clear of all Liens (other than transfer restrictions under applicable Securities Law, under the governing documents of BCSA or under that certain
Letter Agreement, dated November 9, 2021, between BCSA, Sponsor and the members of the BCSA Board). Except for the Equity Securities of BCSA set forth on Schedule I hereto, together with any other Equity Securities of BCSA that Sponsor acquires
record or beneficial ownership of after the date hereof that is either permitted pursuant to or acquired in accordance with Section 5.10(g) of the Business Combination Agreement, Sponsor does not own, beneficially or of
record, any Equity Securities of BCSA or have the right to acquire any Equity Securities of BCSA. Sponsor has the sole right to vote (and provide consent in respect of, as applicable) the Subject BCSA Equity Securities and, except for this Sponsor
Letter Agreement, the Business Combination Agreement, the governing documents of BCSA, or any proxy given for purposes of voting in favor of the Transaction Proposals, Sponsor is not party to or bound by (i) any option, warrant, purchase right,
or other Contract that would (either alone or in connection with one or more events, developments or events (including the satisfaction or waiver of any conditions precedent)) require Sponsor to Transfer any of the Subject BCSA Equity Securities or
(ii) any voting trust, proxy or other Contract with respect to the voting or Transfer of any of the Subject BCSA Equity Securities in a manner inconsistent with the requirements of this Sponsor Letter Agreement. 

(f) There is no Proceeding pending or, to Sponsor’s knowledge, threatened in writing against or involving Sponsor or any of its
Affiliates that, if adversely decided or resolved, would reasonably be expected to adversely affect the ability of Sponsor to perform, or otherwise comply with, any of its covenants, agreements or obligations under this Sponsor Letter Agreement in
any material respect. 
 (g) Sponsor understands and acknowledges that each of BCSA and the Company is entering into the Business
Combination Agreement in reliance upon Sponsor’s execution and delivery of this Sponsor Letter Agreement. 

  
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 5. Termination. This Sponsor Letter Agreement and all of its provisions shall
terminate and be of no further force or effect upon the earliest of (a) the Effective Time, (b) the termination of the Business Combination Agreement prior to the Closing in accordance with its terms, (c) the liquidation of BCSA and
(d) the written agreement of Sponsor, BCSA and the Company. Upon such termination of this Sponsor Letter Agreement, all obligations of the parties under this Sponsor Letter Agreement will terminate, without any liability or other obligation on
the part of any party hereto to any Person in respect hereof or the transactions contemplated hereby, and no party hereto shall have any claim against another (and no person shall have any rights against such party), whether under contract, tort or
otherwise, with respect to the subject matter hereof; provided, however, that the termination of this Sponsor Letter Agreement shall not relieve any party hereto from liability arising in respect of any breach of this Sponsor Letter Agreement prior
to such termination. Sections 5 to 11 of this Sponsor Letter Agreement shall survive the termination of this Sponsor Letter Agreement. 

6. No Recourse. Except for claims pursuant to the Business Combination Agreement or any other Ancillary Document by any party(ies)
thereto against any other party(ies) thereto on the terms and subject to the conditions therein and except for claims based on or for fraud, each Party agrees that (a) this Sponsor Letter Agreement may only be enforced against, and any action
for breach of this Sponsor Letter Agreement may only be made against, the Parties, and no claims of any nature whatsoever (whether in tort, contract or otherwise) arising under or relating to this Sponsor Letter Agreement, the negotiation hereof or
its subject matter, or the transactions contemplated hereby shall be asserted against any Representatives of any Party (other than the Persons named as parties hereto), and (b) none of the Representatives of any Party (other than the Persons
named as parties hereto, on the terms and subject to the conditions set forth herein) shall have any Liability arising out of or relating to this Sponsor Letter Agreement, the negotiation hereof or its subject matter, or the transactions
contemplated hereby, including with respect to any claim (whether in tort, contract or otherwise) for breach of this Sponsor Letter Agreement, except, in each case, as provided herein. Notwithstanding anything to the contrary in this Sponsor Letter
Agreement, in no event shall BCSA have any obligations or Liabilities related to or arising out of the covenants, agreements, obligations, representations or warrants of the Sponsor under this Sponsor Letter Agreement (including related to or
arising out of any breach of any such covenant, agreement, obligation, representation or warranty by the Sponsor). 
 7. Fiduciary
Duties. Notwithstanding anything in this Sponsor Letter Agreement to the contrary, (a) the Sponsor makes no agreement or understanding herein in any capacity other than in the Sponsor’s capacity as a record holder and/or beneficial
owner of the Subject BCSA Equity Securities, and (b) nothing herein will be construed to limit or affect any action or inaction by any representative of the Sponsor serving as a member of the board of directors (or other similar governing body)
of any BCSA Party or as an officer, employee or fiduciary of any BCSA Party, in each case, acting in such person’s capacity as a director, officer, employee or fiduciary of such BCSA Party. 

8. Amendments and Waivers; Assignment. Any provision of this Sponsor Letter Agreement may be amended or waived if, and only if, such
amendment or waiver is in writing and signed by each Party hereto. Notwithstanding the foregoing, no failure or delay by any Party in exercising any right hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof
preclude any other or further exercise of any other right hereunder. Neither this Sponsor Letter Agreement nor any of the rights, interests or obligations hereunder shall be assignable by any Party without the other Party’s prior written
consent (to be withheld or given in its sole discretion). Any attempted assignment of this Sponsor Letter Agreement not in accordance with the terms of this Section 6 shall be void. 

9. No Ownership Interest. Nothing contained in this Sponsor Letter Agreement will be deemed to vest in the Company any direct or
indirect ownership or incidents of ownership of or with respect to the Subject BCSA Equity Securities. All rights, ownership and economic benefits of and relating to the Subject BCSA Equity Securities shall remain vested in and belong to Sponsor,
and the Company shall have no authority to manage, direct, superintend, restrict, regulate, govern or administer any of the policies or operations of BCSA or exercise any power or authority to direct Sponsor in the voting of any of the Subject BCSA
Equity Securities, except as otherwise expressly provided herein with respect to the Subject BCSA Equity Securities. Except as otherwise expressly provided in Section 1, Sponsor shall not be restricted from voting in favor
of, against or abstaining with respect to or giving (or withholding) its written consent to any other matters presented to the shareholders of BCSA. 

  
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 10. 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) (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: 

If to any BCSA Party, to: 

Blockchain Coinvestors Acquisition Corp. I 

PO Box 1093, Boundary Hall 

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

with a copy to: 
 Perkins Coie LLP

 1120 N.W. Couch Street Tenth Floor 

Portland, Oregon 97209 

Attention: M. Christopher Hall and Gina Eiben 

If to the Company, to: 
 Qenta
Inc. 
 777 Post Oak Blvd. #430, Houston, TX 77056 

Email: legalnotices@qenta.com (with a copy to carlos.garduno@qenta.com and salil.rajadhyaksha@qenta.com) 

or to such other address as the Party to whom notice is given may have furnished following the date of this Sponsor Letter Agreement and prior to such notice
to the others in writing in the manner set forth above. 
 11. No Third Party Beneficiaries. This Sponsor Letter Agreement shall be
for the sole benefit of the Parties and their respective successors and permitted assigns (which shall, for the avoidance of doubt, include any successor to BCSA, which successor shall be bound by all obligations and entitled to enforce all rights
of BCSA under this Sponsor Letter Agreement) and is not intended, nor shall be construed, to give any Person, other than the Parties and their respective successors and assigns, any legal or equitable right, benefit or remedy of any nature
whatsoever by reason this Sponsor Letter Agreement. Nothing in this Sponsor Letter Agreement, expressed or implied, is intended to or shall constitute the Parties, partners or participants in a joint venture. 

12. Construction; Miscellaneous. Sections 8.1, 8.5, 8.7, 8.10, 8.11, 8.13 and
8.15–8.17 of the Business Combination Agreement shall apply to this Sponsor Letter Agreement, mutatis mutandis. 
 13.
Entire Agreement. This Sponsor Letter Agreement, the Business Combination Agreement and documents referred to herein and therein constitutes the entire agreement of the Parties with respect to the subject matter of this Sponsor Letter
Agreement, and supersedes all prior agreements and undertakings, both written and oral, among the Parties with respect to the subject matter of this Sponsor Letter Agreement, except as otherwise expressly provided in this Sponsor Letter Agreement.

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 IN WITNESS WHEREOF, the Sponsor, BCSA and the Company have each caused this Sponsor Letter
Agreement to be duly executed as of the date first written above. 
  

			
	 SPONSOR:
  

BLOCKCHAIN COINVESTORS ACQUISITION SPONSORS I LLC

		
	By:	 	 /s/ Lou Kerner

		 	 Name: Lou Kerner
 Title:
  Manager

  
 [Signature Page to
Sponsor Support Agreement] 

 IN WITNESS WHEREOF, the Sponsor, BCSA and the Company have each caused this Sponsor Letter
Agreement to be duly executed as of the date first written above. 
  

			
	 BCSA:
  

BLOCKCHAIN COINVESTORS ACQUISITION CORP. I

		
	By:	 	 /s/ Lou Kerner

		 	 Name: Lou Kerner
 Title: Chief Executive
Officer

  
 [Signature Page to
Sponsor Support Agreement] 

 IN WITNESS WHEREOF, the Sponsor, BCSA and the Company have each caused this Sponsor Letter
Agreement to be duly executed as of the date first written above. 
  

			
	 COMPANY:
  

QENTA INC.

		
	By:	 	 /s/ Brent de Jong

		 	 Name: Brent de Jong
 Title:
Chairman

  
 [Signature Page to
Sponsor Support Agreement]EX-10.2

 Exhibit 10.2 

FORM OF TRANSACTION SUPPORT AGREEMENT 

This TRANSACTION SUPPORT AGREEMENT (this “Agreement”) is dated as of [•], 2022, by and between Blockchain Coinvestors
Acquisition Corp. I, an exempted company incorporated in the Cayman Islands with limited liability, which shall domesticate as a Delaware corporation in accordance with the Business Combination Agreement (such entity, including the continuing
Delaware corporation, “BCSA”), and [•], a [•] (the “Shareholder”). Each of BCSA and the Shareholder are sometimes referred to herein individually as a “Party” and collectively as the
“Parties”. Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Business Combination Agreement (as defined below). 

RECITALS 
 WHEREAS,
BCSA, BCSA Merger Sub, Inc., a Delaware corporation (“Merger Sub”), and QENTA Inc., a Delaware corporation (the “Company”) entered into that certain Business Combination Agreement, dated as of the date hereof (as it
may be amended or modified from time to time in accordance with its terms, the “Business Combination Agreement”) pursuant to which, among other things, Merger Sub will merge with and into the Company, with the Company as the
surviving company in the merger and, after giving effect to such merger, becoming a wholly-owned Subsidiary of BCSA, and each Company Share (including the Subject Company Shares (as defined below)) will be converted into the right to receive BCSA
Shares, in each case, on the terms and subject to the conditions set forth in the Business Combination Agreement; 
 WHEREAS, the
Shareholder is the record and beneficial owner of the number and class or series (as applicable) of issued and outstanding Company Shares set forth on Schedule A hereto (the “Owned Shares”, and together with any other Company
Shares that the Shareholder acquires record and beneficial ownership after the date hereof, collectively, the “Subject Company Shares”); and 

WHEREAS, in consideration for the benefits to be received by the Shareholder under the terms of the Business Combination Agreement and
as a material inducement to BCSA and Merger Sub agreeing to enter into and consummate the transactions contemplated by the Business Combination Agreement, the Shareholder desires to enter into this Agreement and to be bound by the agreements,
covenants and obligations contained in this Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the premises and the mutual promises set forth herein and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties, each intending to be legally bound, hereby agree as follows: 

1. Company Shareholder Consent and Related Matters. 

(a) As promptly as reasonably practicable and in any event within two (2) Business Days following the date on which the Registration
Statement / Proxy Statement is declared effective under the Securities Act, the Shareholder, in the Shareholder’s capacity as a stockholder of the Company, shall duly execute and deliver to the Company and BCSA the Company Shareholder Written
Consent under which the Shareholder shall irrevocably and unconditionally consent with respect to the Subject Company Shares to the adoption and approval of the Business Combination Agreement and the transactions contemplated thereby (including the
Merger). Without limiting the generality of the foregoing, (i) prior to the Closing the Shareholder shall vote (or cause to be voted) the Subject Company Shares in favor of and/or consent to any such other matters, actions or proposals
necessary or reasonably requested by the Company or BCSA for 

 
consummation of the Merger or the other transactions contemplated by the Business Combination Agreement and (ii) prior to the Closing, the Shareholder shall vote (or cause to be voted) and
withhold consent with respect to (A) any Company Competing Acquisition or any proposal or offer that constitutes or could reasonably be expected to lead to a Company Competing Acquisition, (B) any other matter, action or proposal that
would reasonably be expected to result in a breach of any of the Company’s covenants, agreements or obligations under the Business Combination Agreement or (C) any of the conditions to the Closing set forth in Sections 6.2(a) and
6.2(b) of the Business Combination Agreement not being satisfied; provided, that nothing in this Agreement shall preclude the Shareholder from exercising full power and authority to vote the Subject Company Shares in the
Shareholder’s sole discretion for or against, and the proxy granted pursuant to this Agreement shall not cover, any proposal submitted to a vote of the stockholders of the Company (1) that decreases the amount or changes the form of the
consideration payable to the Shareholder or (2) that imposes any material restrictions or additional conditions on the consummation of the Merger or the payment of the BCSA Shares to the Shareholder, in the case of either clause (1) or
(2), not contemplated by the Business Combination Agreement or the Ancillary Documents. 
 (b) Without limiting any other rights or remedies
of BCSA, the Shareholder hereby irrevocably appoints BCSA or any officer of BCSA designated by BCSA as the Shareholder’s agent, attorney-in-fact and proxy (with
full power of substitution and resubstitution), for and in the name, place and stead of the Shareholder, (i) to attend on behalf of the Shareholder any meeting of the Company Shareholders with respect to the matters described in
Section 1(a), (ii) to include the Subject Company Shares in any computation for purposes of establishing a quorum at any such meeting of the Company Shareholders and (iii) to vote (or cause to be voted), or deliver a
written consent (or withhold consent) with respect to, the Subject Company Shares on the matters specified in, and in accordance and consistent with, Section 1(a) in connection with any meeting of the Company Shareholders
or any action by written consent by the Company Shareholders (including the Company Shareholder Written Consent), in each case, in the event that the Shareholder fails to perform or otherwise comply with the covenants, agreements or obligations set
forth in Section 1(a). 
 (c) The proxy granted by the Shareholder pursuant to
Section 1(b) is coupled with an interest sufficient in law to support an irrevocable proxy and is granted in consideration for BCSA entering into the Business Combination Agreement and agreeing to consummate the
transactions contemplated thereby. The proxy granted by the Shareholder pursuant to Section 1(b) is also a durable proxy and shall survive the bankruptcy, dissolution, death, incapacity or other inability to act by the
Shareholder and shall revoke any and all prior proxies granted by the Shareholder with respect to the Subject Company Shares. The vote or consent of the proxyholder in accordance with Section 1(b) and with respect to the
matters described in Section 1(a) shall control in the event of any conflict between such vote or consent by the proxyholder of the Subject Company Shares and a vote or consent by the Shareholder of the Subject Company
Shares (or any other Person with the power to vote or provide consent with respect to the Subject Company Shares) with respect to the matters described in Section 1(a). 

2. Other Covenants and Agreements. 

(a) The Shareholder agrees that the Shareholder shall (i) be bound by and subject to (A) Sections 5.3(a) (Confidentiality and
Access to Information) and Section 5.4 (Public Announcements) of the Business Combination Agreement to the same extent as such provisions apply to the parties to the Business Combination Agreement, as if the Shareholder is
directly party thereto, and (B) Section 8.18 (Trust Account Waiver) of the Business Combination Agreement to the same extent as such provisions apply to the Company, as if the Shareholder is directly party thereto and
(ii) not, directly or indirectly, take any action that the Company is prohibited from taking pursuant to Section 5.6(a) of the Business Combination Agreement. 

  
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 (b) The Shareholder acknowledges and agrees that BCSA and Merger Sub are entering into the
Business Combination Agreement in reliance upon the Shareholder entering into this Agreement and agreeing to be bound by, and perform, or otherwise comply with, as applicable, the agreements, covenants and obligations contained in this Agreement and
but for the Shareholder entering into this Agreement and agreeing to be bound by, and perform, or otherwise comply with, as applicable, the agreements, covenants and obligations contained in this Agreement, BCSA and the other BCSA Parties would not
have entered into or agreed to consummate the transactions contemplated by the Business Combination Agreement or the Ancillary Documents. 

3. Shareholder Representations and Warranties. The Shareholder represents and warrants to BCSA as follows: 

(a) If the Shareholder is an entity, the Shareholder is a corporation, limited liability company or other applicable business entity duly
organized or formed, as applicable, validly existing and in good standing (or the equivalent thereof, if applicable, in each case, with respect to the jurisdictions that recognize the concept of good standing or any equivalent thereof) under the
Laws of its jurisdiction of formation or organization (as applicable). 
 (b) The Shareholder has, if the Shareholder is an entity, the
requisite corporate, limited liability company or other similar power and authority, and if the Shareholder is a person, the capacity, right and authority, to execute and deliver this Agreement, to perform the Shareholder’s covenants,
agreements and obligations hereunder (including, for the avoidance of doubt, those covenants, agreements and obligations hereunder that relate to the provisions of the Business Combination Agreement), and to consummate the transactions contemplated
hereby. If the Shareholder is an entity, the execution and delivery of this Agreement has been duly authorized by all necessary corporate (or other similar) action on the part of the Shareholder. This Agreement has been duly and validly executed and
delivered by the Shareholder and constitutes a valid, legal and binding agreement of the Shareholder (assuming that this Agreement is duly authorized, executed and delivered by BCSA), enforceable against the Shareholder in accordance with its terms
(subject to applicable bankruptcy, insolvency, reorganization, moratorium or other Laws affecting generally the enforcement of creditors’ rights and subject to general principles of equity). 

(c) No consent, approval or authorization of, or designation, declaration or filing with, any Governmental Entity is required on the part of
the Shareholder with respect to the Shareholder’s execution, delivery or performance of his, her or its covenants, agreements or obligations under this Agreement (including, for the avoidance of doubt, those covenants, agreements and
obligations under this Agreement that relate to the provisions of the Business Combination Agreement) or the consummation of the transactions contemplated hereby, except for any consents, approvals, authorizations, designations, declarations,
waivers or filings, the absence of which would not adversely affect the ability of the Shareholder to perform, or otherwise comply with, any of the Shareholder’s covenants, agreements or obligations hereunder in any material respect. 

(d) None of the execution or delivery of this Agreement by the Shareholder, the performance by the Shareholder of any of the
Shareholder’s covenants, agreements or obligations under this Agreement (including, for the avoidance of doubt, those covenants, agreements and obligations under this Agreement that relate to the provisions of the Business Combination
Agreement) or the consummation of the transactions contemplated hereby will, directly or indirectly (with or without due notice or lapse of time or both) (i) to the extent Shareholder is in an entity, result in any breach of any provision of
the Shareholder’s governing documents, (ii) result in a violation or breach of, or constitute a default or give rise to any right of termination, Consent, cancellation, amendment, modification, suspension, revocation or acceleration under,
any of the terms, conditions or provisions of any Contract to which the Shareholder is 

  
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a party, (iii) violate, or constitute a breach under, any Order or applicable Law to which the Shareholder or any of the Shareholder’s properties or assets are bound or (iv) result
in the creation of any Lien upon the Subject Company Shares, except, in the case of any of clauses (ii) and (iii) above, as would not adversely affect the ability of the Shareholder to perform, or otherwise comply with, any of the
Shareholder’s covenants, agreements or obligations hereunder in any material respect. 
 (e) The Shareholder is the record and
beneficial owner of the Owned Shares and has valid, good and marketable title to the Owned Shares, free and clear of all Liens (other than transfer restrictions under applicable Securities Law or under the Company Shareholders Agreement). Except for
the Equity Securities of the Company set forth on Schedule A hereto, together with any other Equity Securities of the Company that the Shareholder acquires record or beneficial ownership after the date hereof that is either permitted pursuant
to or acquired in accordance with Section 5.1(b)(v) of the Business Combination Agreement, the Shareholder does not own, beneficially or of record, any Equity Securities of any Group Company or have the right to acquire any
Equity Securities of any Group Company. The Shareholder has the sole right to vote (and provide consent in respect of, as applicable) the Owned Shares and, except for this Agreement and the Business Combination Agreement, the Shareholder is not
party to or bound by (i) any option, warrant, purchase right, or other Contract that could (either alone or in connection with one or more events, developments or events (including the satisfaction or waiver of any conditions precedent))
require the Shareholder to Transfer any of the Subject Company Shares or (ii) any voting trust, proxy or other Contract with respect to the voting or Transfer of any of the Subject Company Shares that would adversely affect the ability of the
Shareholder to perform, or otherwise comply with, any of the Shareholder’s covenants, agreements or obligations hereunder in any material respect. 

(f) There is no Proceeding pending or, to the Shareholder’s knowledge, threatened in writing against or involving the Shareholder or any
of the Shareholder’s Affiliates that, if adversely decided or resolved, would reasonably be expected to adversely affect the ability of the Shareholder to perform, or otherwise comply with, any of its covenants, agreements or obligations under
this Agreement in any material respect. 
 (g) The Shareholder, on the Shareholder’s own behalf and on behalf of the Shareholder’s
Representatives, acknowledges, represents, warrants and agrees that (i) the Shareholder has conducted the Shareholder’s own independent review and analysis of, and, based thereon, has formed an independent judgment concerning, the
business, assets, condition, operations and prospects of, the BCSA Parties and the transactions contemplated by this Agreement, the Business Combination Agreement and the other Ancillary Documents to which the Shareholder is or will be a party and
(ii) the Shareholder has been furnished with or given access to such documents and information about the BCSA Parties, their respective businesses and operations, and the transactions contemplated by this Agreement, the Business Combination
Agreement and the other Ancillary Documents to which the Shareholder is or will be a party as the Shareholder and the Shareholder’s Representatives have deemed necessary to enable the Shareholder to make an informed decision with respect to the
execution, delivery and performance of this Agreement or the other Ancillary Documents to which the Shareholder is or will be a party and the transactions contemplated hereby and thereby. 

(h) In entering into this Agreement and the other Ancillary Documents to which the Shareholder is or will be a party, the Shareholder has
relied solely on the Shareholder’s own investigation and analysis and the representations and warranties expressly set forth in the Ancillary Documents to which the Shareholder is or will be a party and no other representations or warranties of
any BCSA Party (including, for the avoidance of doubt, none of the representations or warranties of any BCSA Party set forth in the Business Combination Agreement or any other Ancillary Document) or any other Person, either express or implied, and
the Shareholder, on the Shareholder’s own behalf and on behalf of the Shareholder’s Representatives, acknowledges, represents, warrants and agrees that, except for the representations and warranties expressly set forth in this Agreement or
in the other Ancillary Documents to which the Shareholder is or will be a party, none of the BCSA Parties or any other Person makes or has made any representation or warranty, either express or implied, in connection with or related to this
Agreement, the Business Combination Agreement or the other Ancillary Documents or the transactions contemplated hereby or thereby. 
  

  
 - 4 - 

 4. Transfer of Subject Company Shares. Except as expressly contemplated by the
Business Combination Agreement or with the prior written consent of BCSA (such consent to be given or withheld in its sole discretion), from and after the date hereof, the Shareholder agrees not to (a) Transfer any of the Subject Company
Shares, (b) enter into (i) any option, warrant, purchase right, or other Contract that could (either alone or in connection with one or more events or developments (including the satisfaction or waiver of any conditions precedent)) require
the Shareholder to Transfer the Subject Company Shares or (ii) any voting trust, proxy or other Contract with respect to the voting or Transfer of the Subject Company Shares, or (c) enter into any Contract to take, or cause to be taken,
any of the actions set forth in clauses (a) or (b); provided, however, that the foregoing shall not apply to any Transfer (A) to any Affiliates of the Shareholder; (B) in the case of an individual, by gift
to a member of one of the individual’s immediate family, to a trust, the beneficiary of which is a member of the individual’s immediate family or an Affiliate of such person; (C) in the case of an individual, by virtue of laws of
descent and distribution upon death of the individual; and (D) by virtue of the Shareholder’s organizational documents upon liquidation or dissolution of the Shareholder; provided, that Shareholder shall, and shall cause any
transferee of any Transfer of the type set forth in clauses (A) through (C), to enter into a written agreement in form and substance reasonably satisfactory to BCSA, agreeing to be bound by this Agreement (which will include, for the avoidance
of doubt, all of the covenants, agreements and obligations of the Shareholder hereunder and the making of all the representations and warranties of the Shareholder set forth in Section 3 with respect to such transferee and
the Shareholder’s Subject Company Shares received upon such Transfer, as applicable) prior and as a condition to the occurrence of such Transfer. For purposes of this Agreement, “Transfer” means any, direct or indirect, sale,
transfer, assignment, pledge, mortgage, exchange, hypothecation, grant of a security interest or encumbrance in or disposition of an interest (whether with or without consideration, whether voluntarily or involuntarily or by operation of law or
otherwise). 
 5. Termination. This Agreement and all of its provisions shall terminate and be of no further force or effect upon the
earlier of (a) the Effective Time or (b) the termination of the Business Combination Agreement prior to the Closing in accordance with its terms. Upon such termination of this Agreement, all obligations of the parties under this Agreement
will terminate, without any liability or other obligation on the part of any party hereto to any Person in respect hereof or the transactions contemplated hereby, and no party hereto shall have any claim against another (and no person shall have any
rights against such party), whether under contract, tort or otherwise, with respect to the subject matter hereof; provided, however, that the termination of this Agreement shall not relieve the Shareholder from liability for fraud, intentional
misrepresentation or any breach of this Agreement prior to such termination. Section 2(a), Section 3 and Sections 5 to 12 of this Agreement shall survive the termination of this
Agreement. 
 6. Fiduciary Duties. Notwithstanding anything in this Agreement to the contrary, (a) the Shareholder makes no
agreement or understanding herein in any capacity other than in such Shareholder’s capacity as a record holder and beneficial owner of the Subject Company Shares, and not in such Shareholder’s capacity as a director, officer or employee of
any Group Company or in such Shareholder’s capacity as a trustee or fiduciary of any Company Equity Plan, as applicable and (b) nothing herein will be construed to limit or affect any action or inaction by such Shareholder or any
representative of such Shareholder serving as a member of the board of directors of any Group Company or as an officer, employee or fiduciary of any Group Company, in each case, acting in such person’s capacity as a director, officer, employee
or fiduciary of such Group Company. 

  
 - 5 - 

 7. No Recourse. Except for claims pursuant to the Business Combination
Agreement or any other Ancillary Document by any party(ies) thereto against any other party(ies) thereto on the terms and subject to the conditions therein and except for claims based on or for fraud, each Party agrees that (a) this
Agreement may only be enforced against, and any action for breach of this Agreement may only be made against, the Parties, and no claims of any nature whatsoever (whether in tort, contract or otherwise) arising under or relating to this Agreement,
the negotiation hereof or its subject matter, or the transactions contemplated hereby shall be asserted against the Company or any Company Affiliated Party (other than the Shareholder named as a party hereto, on the terms and subject to the
conditions set forth herein) or any BCSA Affiliated Party, and (b) none of the Company, any Company Affiliated Party (other than the Shareholder named as a party hereto, on the terms and subject to the conditions set forth herein) or any
BCSA Affiliated Party shall have any Liability arising out of or relating to this Agreement, the negotiation hereof or its subject matter, or the transactions contemplated hereby, including with respect to any claim (whether in tort, contract
or otherwise) for breach of this Agreement, except, in each case, as provided herein. 
 8. 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) (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 email was sent to the intended recipient thereof without an “error” or similar message that such email was not received by such intended recipient)), or
(iii) by nationally recognized overnight delivery service to the other Parties as follows: 
 If to any BCSA Party, to: 

Blockchain Coinvestors Acquisition Corp. I 

PO Box 1093, Boundary Hall 

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

with a copy to: 
 Perkins Coie LLP

 1120 N.W. Couch Street Tenth Floor 

Portland, Oregon 97209 

Attention: M. Christopher Hall and Gina Eiben 

If to the Company, to: 
 Qenta
Inc. 
 777 Post Oak Blvd. #430, Houston, TX 77056 

Email: legalnotices@qenta.com (with a copy to carlos.garduno@qenta.com and salil.rajadhyaksha@qenta.com) 

or to such other address as the Party to whom notice is given may have furnished following the date of this Agreement and prior to such notice
to the others in writing in the manner set forth above. 
 9. Entire Agreement. This Agreement, the Business Combination Agreement
and documents referred to herein and therein constitutes the entire agreement of the Parties with respect to the subject matter of this Agreement, and supersedes all prior agreements and undertakings, both written and oral, among the Parties with
respect to the subject matter of this Agreement, except as otherwise expressly provided in this Agreement. 

  
 - 6 - 

 10. Amendments and Waivers; Assignment. Any provision of this Agreement may be
amended or waived if, and only if, such amendment or waiver is in writing and signed by the Shareholder and BCSA. Notwithstanding the foregoing, no failure or delay by any Party in exercising any right hereunder shall operate as a waiver thereof nor
shall any single or partial exercise thereof preclude any other or further exercise of any other right hereunder. Neither this Agreement nor any of the rights, interests or obligations hereunder shall be assignable by any Party without BCSA’s
prior written consent (in the case of the Shareholder) and the Shareholder’s written consent (in the case of BCSA) (in each case, to be withheld or given in its sole discretion). Any attempted assignment of this Agreement not in accordance with
the terms of this Section 10 shall be void. 
 11. Fees and Expenses. Without limiting BCSA’s
rights under the Business Combination Agreement, all fees and expenses incurred in connection with this Agreement and the transactions contemplated hereby, including the fees and disbursements of counsel, financial advisors and accountants, shall be
paid by the Party incurring such fees or expenses. 
 12. Remedies. Except as otherwise expressly provided herein, any and all
remedies provided herein will be deemed cumulative with and not exclusive of any other remedy conferred hereby, or by law or equity upon such Party, and the exercise by a Party of any one remedy will not preclude the exercise of any other
remedy. The Parties agree that irreparable damage for which monetary damages, even if available, would not be an adequate remedy, would occur in the event that either Party does not perform such Party’s respective obligations under the
provisions of this Agreement in accordance with their specific terms or otherwise breach such provisions. It is accordingly agreed that each Party shall be entitled to an injunction or injunctions, specific performance and other equitable
relief to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, in each case, without posting a bond or undertaking and without proof of damages and this being in addition to any other remedy to
which they are entitled at law or in equity. Each Party agrees that such Party will not oppose the granting of an injunction, specific performance and other equitable relief when expressly available pursuant to the terms of this Agreement
on the basis that the other parties have an adequate remedy at law or an award of specific performance is not an appropriate remedy for any reason at law or equity. 

13. Third Party Beneficiaries. This Agreement shall be for the sole benefit of the Parties and their respective successors and
permitted assigns and is not intended, nor shall be construed, to give any Person, other than the Parties and their respective successors and assigns, any legal or equitable right, benefit or remedy of any nature whatsoever by reason this Agreement.
Nothing in this Agreement, expressed or implied, is intended to or shall constitute the Parties as partners or participants in a joint venture. 

14. No Ownership Interest. Nothing contained in this Agreement will be deemed to vest in BCSA any direct or indirect ownership or
incidents of ownership of or with respect to the Subject Company Shares. All rights, ownership and economic benefits of and relating to the Subject Company Shares shall remain vested in and belong to Shareholder, and BCSA shall have no authority to
manage, direct, superintend, restrict, regulate, govern or administer any of the policies or operations of Company or exercise any power or authority to direct Shareholder in the voting of any of the Subject Company Shares, except as otherwise
provided herein with respect to the Subject Company Shares. Without limiting the foregoing, nothing in this Agreement shall obligate or require the Shareholder to exercise an option to purchase any Company Shares. 

  
 - 7 - 

 15. Acknowledgements. The Parties each acknowledge that (a) Perkins Coie LLP,
counsel for BCSA, is representing BCSA in connection with this Agreement, the Business Combination Agreement, the Ancillary Documents and the transactions contemplated hereby and thereby and (b) Perkins Coie LLP is not representing the
Shareholder in connection with this Agreement, the Merger, the Business Combination Agreement, the Ancillary Document or the transactions contemplated hereby, thereby or otherwise. The Shareholder acknowledges that such Shareholder has had the
opportunity to consult with such Shareholder’s own counsel. 
 16. Construction; Miscellaneous. Sections 8.1, 8.5,
8.7, 8.10, 8.11, 8.13 and 8.15–8.16 of the Business Combination Agreement shall apply to this agreement, mutatis mutandis. 

[SIGNATURE PAGES FOLLOW] 

  
 - 8 - 

 IN WITNESS WHEREOF, the Parties have executed and delivered this Transaction Support
Agreement as of the date first above written. 
  

			
	 BLOCKCHAIN COINVESTORS ACQUISITION CORP. I

		
	By:	 	  

	Name:	 	
	Title:	 	

  
 [Signature Page to
Transaction Support Agreement] 

 IN WITNESS WHEREOF, the Parties have executed and delivered this Transaction Support
Agreement as of the date first above written. 
  

			
	 [SHAREHOLDER]

		
	By:	 	  

	Name:	 	
	Title:	 	

  
 [Signature Page to
Transaction Support Agreement] 

 SCHEDULE A 

 

			
	 Company Shares
	  	 Number of Shares

	 Common Stock
	  	[•]

  
 Schedule A – Page 1

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