Combined Statements of Changes in Net Assets - USD ($)		3 Months Ended		5 Months Ended	9 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2025
Net assets, beginning of period		$ 90,925,327	$ 30,963,023	$ 2,621,065	$ 21,605,398
Net investment loss		(35,569)	0	0	(85,512)
Net realized gain (loss) on investment in ether		353,054	215,469	20,638	3,260,379
Net change in unrealized appreciation (depreciation) on investment in ether		(24,838,286)	8,286,409	1,509,264	6,347,571
Net increase (decrease) in net assets resulting from operations		(24,520,801)	8,501,878	1,529,902	9,522,438
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[1]	12,571,416	6,216,940	42,553,442	72,528,985
Distributions for Shares redeemed		(21,491,502)	(3,878,497)	(4,901,065)	(46,172,381)
Net increase (decrease) in net assets resulting from capital share transactions		(8,920,086)	2,338,443	37,652,377	26,356,604
Net assets, end of period		57,484,440	41,803,344	41,803,344	57,484,440
Franklin Ethereum ETF [Member]
Net assets, beginning of period		90,925,327	30,963,023	2,621,065	21,605,398
Net investment loss		(35,569)	0	0	(85,512)
Net realized gain (loss) on investment in ether		353,054	215,469	20,638	3,260,379
Net change in unrealized appreciation (depreciation) on investment in ether		(24,838,286)	8,286,409	1,509,264	6,347,571
Net increase (decrease) in net assets resulting from operations		(24,520,801)	8,501,878	1,529,902	9,522,438
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[2]	12,571,416	6,216,940	42,553,442	72,528,985
Distributions for Shares redeemed		(21,491,502)	(3,878,497)	(4,901,065)	(46,172,381)
Net increase (decrease) in net assets resulting from capital share transactions		(8,920,086)	2,338,443	37,652,377	26,356,604
Net assets, end of period		$ 57,484,440	$ 41,803,344	$ 41,803,344	$ 57,484,440

[1] 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.

[2] 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.