| Cover | Apr. 27, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | false |
| Document Period End Date | Apr. 27, 2023 |
| Entity File Number | 001-41047 |
| Entity Registrant Name | Chain Bridge I |
| Entity Central Index Key | 0001845149 |
| Entity Tax Identification Number | 98-1578955 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 330 Primrose Road |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Burlingame |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94010 |
| City Area Code | 202 |
| Local Phone Number | 656-4257 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one Class A ordinary share and one-half of one redeemable Warrant to acquire one Class A ordinary share [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half of one redeemable Warrant to acquire one Class A ordinary share |
| Trading Symbol | CBRGU |
| Security Exchange Name | NASDAQ |
| Common Class A [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CBRG |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |
| Trading Symbol | CBRGW |
| Security Exchange Name | NASDAQ |
