| Cover | Jun. 28, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 28, 2024 |
| Entity File Number | 001-39258 |
| Entity Registrant Name | BTC DIGITAL LTD. |
| Entity Central Index Key | 0001796514 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 1306, 13th Floor, Xuesong Dasha Building B |
| Entity Address, Address Line Two | No. 52 Tairan 6th Road, Futian District |
| Entity Address, City or Town | Shenzhen |
| Entity Address, Country | CN |
| Entity Address, Postal Zip Code | 000000 |
| City Area Code | +86 |
| Local Phone Number | 755-8255-5262 |
| 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 |
| Ordinary Shares | |
| Title of 12(b) Security | Ordinary Shares |
| Trading Symbol | BTCT |
| Security Exchange Name | NASDAQ |
| Warrants | |
| Title of 12(b) Security | Warrants |
| Trading Symbol | BTCTW |
| Security Exchange Name | NASDAQ |
