It makes me think: What would a device with a spring to launch the coin do? It would almost certainly eliminate all bias in coin tosses - provided it is engineered properly - and it could even be made into a wearable on your hand that you can use to emulate a traditional coin toss.
My gut feeling tells me this spring would create the same result every time, because the initial conditions are the same. Unless the spring tension varies, in that case the spring tension becomes your random and you need to make sure there's no bias in it. Or the way you load the coin into the machine.
Just for fun: here's a
Machine Flips a Coin 10,000 Times.