CG1 query for cryptocurrency gains

I'm wondering which asset type cryptocurrency gains fall under in the CG1 return, I'm guessing

(b) Shares / Securities - Unquoted

but haven't found a definitive reference so far. Any comment or pointer to a definitive reference welcome.

Thanks

(incidentally, I'm a longtime lurker but first time poster - fantastic site, many thanks to all the contributors, I've learned a lot from lurking here)

Cryptocurrency falls under (k) other assets.