Not sure I entirely agree with your 15% withholding tax statement. That only applies to dividends or other income recieved by the foreign investment. As a canadian resident, I have traded several US listed (no Canadian listing) stocks and paid my share of Canadian tax on 50% of the capital gains after converting to $C. Dividends paid to me by the US stock was subject to the withholding tax and all documentation and tax slips were provided to me. As far as I know, PTK is not planning on starting a dividend distribution any time soon!

One thing the CRA does require to report is any foreign property owned that is cost over $100,000. As far as I know, there is no tax applies to this and is just to keep the CRA snooping in your affairs and is just accounting paperwork.