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You can use ETFs that hold those assets, for example: https://totalrealreturns.com/s/GBTC,ETHE

Well, you're both right and wrong. He's right You CAN, but your linked article is also 100% correct, GBTC / trusts are absolutely NOT etf's.

There are however etfs for crypto in other districts (I hold for example ethx.b, a canadian ETF that tracks ETH within my RRSP).

Well, the funds you mentioned are not on the website.