if you have to sign off , you effectively become self employed which would let you

claim cost of computer, monitor etc as cost of business
claim part of your rent/electric as part of your operating costs
claim subscriptions for things like trading view as operating costs when related to your "work"
claim any accountancy fees against taxable profits etc

downsides are that as your job is effectively trading crypto , the income is more likely be treated as income tax rather than capital gains.......this is where your accountant would come in

Never had to deal with benefits .....but are you supposed to be declaring your "profits" to dole office as income ? no idea on that