How to declare missing transaction data and lost assets from FTX exchange

I have used the FTX cryptocurrency exchange in the 2021/22 tax year, but as the company is now insolvent there is no way to access transactional data, and any assets that were on the exchange are now irretrievable. How do I declare this on my self assessment? Do I report any deposits into the exchange as a capital loss? Thank you

Hi,

You can find guidance here:

Negligible value claims and Income Tax losses on disposal of shares (Self Assessment helpsheet HS286)

Thank you.