XML 12 R1.htm IDEA: XBRL DOCUMENT v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-41909  
Entity Registrant Name CoinShares Bitcoin ETF  
Entity Central Index Key 0001841175  
Entity Tax Identification Number 86-6430837  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 437 Madison Avenue, 28th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
City Area Code (615)  
Local Phone Number 909-6421  
Title of 12(b) Security Common Shares of Beneficial Interest  
Trading Symbol BRRR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   22,325,000