Supposedly I got a short-term software engineering remote contract which was agreed to be paid by the cryptocurrencies or tokens on the task-basis (e.g. receiving a certain amount of EOS tokens for task X, and BAT tokens for task Y). The company is based in the EU. To be clear, I'm not planning to monetarize it, like converting it into real currency anytime soon (e.g. converting into GBP), but keep it on the crypto-wallets or trade on the cryptocurrency exchange portals.
Let's assume that I trust the company which is offering me the payments, so personally, I don't need any direct agreement with them for my own safety as all the work is documented well and tasks are tracked using the bug tracking software. For further clarity, I could compare this type of work to Bountysource, but without using the site (in other words, without any middlemen or agents).
Question is, do I need any paperwork to satisfy Revenue and Customs from any kind of tax point of view, IR35 compliance or any other legal purposes?
I've read Revenue and Customs Brief 9 (2014): Bitcoin and other cryptocurrencies, and I think I don't need any paperwork, but I wanted to be sure what's your opinion on that.