Significant Accounting Policies - Summary of Principal Market and the Principal Market Prices for Portfolio Cryto Assets Comprised Majority of Trust Assets (Detail) - Coinbase [Member] - Fair Value Measured at Net Asset Value Per Share [Member]	Dec. 31, 2021 $ / shares
Cardano [Member]
Principal Market Price	$ 1.29
Bitcoin cash [Member]
Principal Market Price	420.63
Ethereum [Member]
Principal Market Price	3,644.75
Chainlink [Member]
Principal Market Price	19.07
Polygon [Member]
Principal Market Price	2.46
Solana [Member]
Principal Market Price	168.25
Uniswap [Member]
Principal Market Price	16.83
Algorand [Member]
Principal Market Price	1.65
Bitcoin [Member]
Principal Market Price	45,867.86
Litecoin [Member]
Principal Market Price	144.08
Avalanche Wallet [Member]
Principal Market Price	$ 107.05