v3.25.4
Document And Entity Information
9 Months Ended
Sep. 30, 2025
Document Information Line Items  
Entity Central Index Key 0002070457
Amendment Description AMENDMENT NO. 1
Document Type S-1/A
Entity Registrant Name Twenty One Capital, Inc.
Entity Incorporation, State or Country Code TX
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag true