SIGNIFICANT ACCOUNTING POLICIES (Tables) |
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| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Digital Assets in Underlying Index and Weight | As of September 30, 2026, the Digital Assets in the Underlying Index and their weightings were as follows:
As of September 30, 2025, the Digital Assets in the Underlying Index and their weightings were as follows:
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| Summary of Changes in Shares | Changes in the Shares for the quarter from July 1, 2026 to September 30, 2026 are as follows:
Changes in the Shares for the quarter from July 1, 2025 to September 30, 2025 are as follows:
Changes in the Shares for the nine months from January 1, 2026 to September 30, 2026 are as follows:
Changes in the Shares for the period from February 20, 2025 (Date of commencement of operations) to September 30, 2025 are as follows:
# Dollar amount of balance represents the cumulative fair value of creation of Shares less the redemption of Shares, at the time of the specific creation or redemption. ^ On January 22, 2025, Franklin Resources, Inc. (the “Seed Capital Investor”), an affiliate of the Sponsor, subject to conditions, purchased 4,000 Shares at a per-Share price equal to $25.00 (the “Initial Seed Shares”). Delivery of the Initial Seed Shares was made on January 22, 2025. Total proceeds to the Fund from the sale of the Initial Seed Shares were $100,000. On February 10, 2025, the Initial Seed Shares were redeemed for $100,000, and the Seed Capital Investor purchased two Creation Units in a cash transaction comprised of a total of 100,000 Shares at a per-Share price based on 11.06240875 bitcoin and 61.7774073 ether per Creation Unit, for a total of 22.1248175 bitcoin and 123.5548146 ether (the “Seed Creation Units”). The cash proceeds to the Fund from the sale of the Seed Creation Units were used by the Fund to purchase 22.1248175 bitcoin at the price of $97,227.80 per bitcoin and 123.5548146 ether at the price of $2,665.23 per ether on February 10, 2025 (exclusive of transaction and other costs incurred in connection with the conversion of the cash proceeds to bitcoin and ether respectively, which were paid by the Seed Capital Investor). Thus, the ultimate total proceeds to the Fund from the sale of the Seed Creation Units were $2,480,449.33 (an amount representing 22.1248175 bitcoin and 123.5548146 ether) representing 100,000 shares at a per-Share price equal to $24.80. Further, the transaction and other costs incurred in connection with the Seed Creation Units were paid by the Seed Capital Investor and not borne by the Fund. |
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| Franklin Crypto Index ETF [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Digital Assets in Underlying Index and Weight | As of September 30, 2026, the Digital Assets in the Underlying Index and their weightings were as follows:
As of September 30, 2025, the Digital Assets in the Underlying Index and their weightings were as follows:
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| Summary of Changes in Shares | Changes in the Shares for the quarter from July 1, 2026 to September 30, 2026 are as follows:
Changes in the Shares for the quarter from July 1, 2025 to September 30, 2025 are as follows:
Changes in the Shares for the nine months from January 1, 2026 to September 30, 2026 are as follows:
Changes in the Shares for the period from February 20, 2025 (Date of commencement of operations) to September 30, 2025 are as follows:
# Dollar amount of balance represents the cumulative fair value of creation of Shares less the redemption of Shares, at the time of the specific creation or redemption. ^ On January 22, 2025, Franklin Resources, Inc. (the “Seed Capital Investor”), an affiliate of the Sponsor, subject to conditions, purchased 4,000 Shares at a per-Share price equal to $25.00 (the “Initial Seed Shares”). Delivery of the Initial Seed Shares was made on January 22, 2025. Total proceeds to the Fund from the sale of the Initial Seed Shares were $100,000. On February 10, 2025, the Initial Seed Shares were redeemed for $100,000, and the Seed Capital Investor purchased two Creation Units in a cash transaction comprised of a total of 100,000 Shares at a per-Share price based on 11.06240875 bitcoin and 61.7774073 ether per Creation Unit, for a total of 22.1248175 bitcoin and 123.5548146 ether (the “Seed Creation Units”). The cash proceeds to the Fund from the sale of the Seed Creation Units were used by the Fund to purchase 22.1248175 bitcoin at the price of $97,227.80 per bitcoin and 123.5548146 ether at the price of $2,665.23 per ether on February 10, 2025 (exclusive of transaction and other costs incurred in connection with the conversion of the cash proceeds to bitcoin and ether respectively, which were paid by the Seed Capital Investor). Thus, the ultimate total proceeds to the Fund from the sale of the Seed Creation Units were $2,480,449.33 (an amount representing 22.1248175 bitcoin and 123.5548146 ether) representing 100,000 shares at a per-Share price equal to $24.80. Further, the transaction and other costs incurred in connection with the Seed Creation Units were paid by the Seed Capital Investor and not borne by the Fund. |
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