On GDAX for example 1/2 hour ago btc/usd was 10674 now it’s 10644 a difference of 30. Is that 30 bought or 30 sold and is that just on this exchange? Newbeee, you can prob. tell.

It goes up and down.

Thanks in advance. Tried to google it but TheBitCoinPub shall no doubt prove more fruitful for a simple answer