I love technology but find crypto currencies and assets duller than football. But it exists, and is taxed, so we need to know how and when.
A myth has built up that it somehow escapes tax or that HMRC cannot understand it.
The latest HMRC manual update gives a good and fair summary of the position https://www.gov.uk/hmrc-internal-manuals/cryptoassets-manual/crypto20000
Any HMRC guidance comes with the warning that it may not reflect the legislation and parts are hidden (eg https://www.gov.uk/hmrc-internal-manuals/cryptoassets-manual/crypto100100). But the guidance is useful and demonstrates where you may face tax and penalty risks if you take a different view. Useful sections are:
Capital gains tax disposals https://www.gov.uk/hmrc-internal-manuals/cryptoassets-manual/crypto22100
Why it isn’t tax free gambling https://www.gov.uk/hmrc-internal-manuals/cryptoassets-manual/crypto10450