| Document and Entity Information | Feb. 03, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Feb. 03, 2023 |
| Entity Registrant Name | BLOCKCHAIN COINVESTORS ACQUISITION CORP. I |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-41050 |
| Entity Tax Identification Number | 98-1607883 |
| Entity Address, Address Line One | PO Box 1093, Boundary Hall |
| Entity Address, Address Line Two | Cricket Square |
| Entity Address, City or Town | Grand Cayman |
| Entity Address, Postal Zip Code | KY1-1102 |
| Entity Address, Country | KY |
| City Area Code | 345 |
| Local Phone Number | 814-5726 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Description | This Current Report on Form 8-K/A is being filed to amend the Current Report on Form 8-K dated February 3, 2023 and filed on February 7, 2023 (the “Form 8-K”) to update the disclosure in Item 8.01 to reflect the final recalculation of the redemption price per share and amount withdrawn from the trust account and other clarifying matters. There were no other changes to the Form 8-K. |
| Current Fiscal Year End Date | --12-31 |
| Entity Central Index Key | 0001873441 |
| Capital Units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one Redeemable Warrant |
| Trading Symbol | BCSAU |
| Security Exchange Name | NASDAQ |
| Class A ordinary shares, par value $0.0001 per share, included as part of the Units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share, included as part of the Units |
| Trading Symbol | BCSA |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable Warrants included as part of the Units |
| Trading Symbol | BCSAW |
| Security Exchange Name | NASDAQ |
