v3.25.2
Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Jun. 16, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference [Text Block] None    
Entity Information [Line Items]      
Entity Registrant Name Chain Bridge I    
Entity Central Index Key 0001845149    
Entity File Number 001-41047    
Entity Tax Identification Number 95-1578955    
Entity Incorporation, State or Country Code E9    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company true    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 11,284,916
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 8 The Green # 17538    
Entity Address, City or Town Dover    
Entity Address, State or Province DE    
Entity Address, Postal Zip Code 19901    
Entity Phone Fax Numbers [Line Items]      
City Area Code (302)    
Local Phone Number 597-7438    
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant to acquire one Class A ordinary share      
Entity Listings [Line Items]      
Trading Symbol CBGGF    
Security Exchange Name NONE    
Title of 12(g) Security Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant to acquire one Class A ordinary share    
Class A ordinary shares, par value $0.0001 per share      
Entity Listings [Line Items]      
Trading Symbol CBRRF    
Security Exchange Name NONE    
Title of 12(g) Security Class A ordinary shares, par value $0.0001 per share    
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50      
Entity Listings [Line Items]      
Trading Symbol CBRGF    
Security Exchange Name NONE    
Title of 12(g) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Class A ordinary shares      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   3,014,736  
Class B ordinary shares      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   3,191,000