Blockchain Coinvestors Acquisition Corp. I (BCSA) S-1 IPO registration

Exhibit 23.1

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM’S CONSENT

We consent to the inclusion in this Registration Statement of Blockchain Coinvestors Acquisition Corp. I on Form S-1 of our report dated August 26, 2021, which includes an explanatory paragraph as to the Company’s ability to continue as a going concern, with respect to our audit of the financial statements of Blockchain Coinvestors Acquisition Corp. I as of July 2, 2021 and for the period from June 11, 2021 (inception) through July 2, 2021, which report appears in the Prospectus, which is part of this Registration Statement. We also consent to the reference to our Firm under the heading “Experts” in such Prospectus.

/s/ MarcumLLP

MarcumLLP

Houston, Texas

August 26, 2021