SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | ||
| Sponsor's fee rate | 0.19% | |
| Accrued Sponsor's fee | $ 205,215 | |
| Extraordinary or non-routine expenses | $ 0 | $ 0 |
| Number of business days to transfer ownership of Bitcoin | 1 day | |
| Franklin Bitcoin ETF [Member] | ||
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | ||
| Sponsor's fee rate | 0.19% | |
| Accrued Sponsor's fee | $ 205,215 | |
| Extraordinary or non-routine expenses | $ 0 | $ 0 |
| Number of business days to transfer ownership of Bitcoin | 1 day | |
| Maximum [Member] | ||
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | ||
| Ordinary legal fees and expenses assumed by the sponsor | $ 500,000 | |
| Maximum [Member] | Franklin Bitcoin ETF [Member] | ||
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | ||
| Ordinary legal fees and expenses assumed by the sponsor | $ 500,000 | |