Gold and bank

How the currency will work in game? Will it be physical and have weight, being able to lock it in the chest, put it in the backpack, being stolen etc.? Or will it be just a static number shown somewhere on the screen without any physical basis?

Also, will Gold be the only currency in game? When Ultima I was released there were some coins sold with it suggesting that Sosaria had several currencies (like bronse, silver, gold) coins.

And how will the banks work in game? Will it be bank buy guards > stack > take out. Or will it be something more systematic, such as the players can take loands, or even run a bank?