v3.25.2
Cover - shares
 3 Months Ended
Mar. 31, 2025
Jul. 11, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
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 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 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  
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol CBRRF  
Security Exchange Name NONE  
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