Hi there,
The ETF is expected to track the price of Bitcoin - plain and simple. Think of Bitcoin as a commodity. If Bitcoin goes up by 5% - the ETF should track it closely. It won't be perfect, but it'll be close. It should be the same as any other commodity ETF. It is as simple as that.
BTCC.B trades in CAD and BTCC.U trades in USD. The BTCC.B vs BTCC.U stocks won't be exactly the same as one another because as I understand it they may not necessarily hold the same amount of bitcoin - it'll depend on demand. Bottom line however, each should track the price movements of Bitcoin.
It owns Bitcoin - so the fund holdings are backed by actual Bitcoin, much like a gold bullion ETF is backed by actual gold.
Mat