I forgot to add that the cryptocurrency I acquired is Bitcoin and that Bitcoin is the official currency (legal tender) of El Salvador and the Central African Republic. So I wonder whether the following would apply: “The situs of foreign currency accounts that are held by UK residents who are not domiciled within the UK are regarded as situated in the UK only if the account is maintained at a UK branch of the bank. Otherwise, the account is regarded as situated offshore.
I'm a non-domiciled resident of the UK. I claim the remittance basis. I have USD 20,000 of foreign income in an overseas bank account. I bought cryptoassets (Bitcoin, a cryptocurrency) with this foreign income from my offshore bank account (my traditional, regulated bank also provides crypto exchange and custody services). The cryptoassets are still in my offshore bank account and I have no plans to move them out of the offshore bank account or to sell them during this fiscal year. As the cryptoassets are kept on the exchange and I don't own the private keys of these assets, they are effectively an "IOU" on the assets (similar to a gold certificate, compared to physical gold).
Does the mere acquisition of the cryptoassets trigger a remittance to the UK? (And if that's the case, do I need to pay income tax on the USD 20,000 foreign income?) Or are the cryptoassets still considered offshore as they're kept on an offshore account?