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Aren’t those data trivial to procure for the common cryptocurrencies? For uncommon ones, just ask the user to find the price on dates X, Y and Z.

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A given day could have multiple instances of open/close price n for any number of trading intervals though couldn't it?

The IRS is usually fine with reasonable approximations. Tax lawyers and preparers are familiar with this problem; their input could inform a compliant system.

Disclaimer: I am neither a lawyer nor a tax expert. This is not legal nor tax advice. Talk to a CPA about your tax situation.

Ahh okay. Thanks for the correction.

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