There's partly functional semi-auto Bitcoin gateway pending deployment, however it's still centralized until we can complete the multi-sig parts of the client side BTC wallet.

These UIs although working had to be disabled for the launch phase and will be enabled next. The API should however give you a lot of options at this phase, although hard to navigate without more example cases

Wait a day or two for the fixes and the Asset-to-asset exchange is definitely something different from the features point of view. Regarding capability and the tps figures, we aim to have benchmarking tools at early phase so every node can meter their own performance. This benchmark may one day be on par with geekbench

Random number is your HEAT balance right? Unknown account just means your account doesn't have a public key and hasn't been used. For more security it's advisable to not hold funds for longer time on such stakeholder accounts.