Quote from: nixoid on June 10, 2010, 08:38:13 PM
4) Can somebody please write more details about transaction fee: why is it needed, how and in which cases it’s used and so on.
Transaction fee is needed to give an incentive to generate blocks after many years from now, when the block value has grown low. Also, if many nodes stop recording transactions into the blocks they generate (because of the small generation speed benefit gained), you can apply transaction fee as an incentive.
There will probably always be nodes that include your transactions into their blocks for free, but you might have to wait for a few blocks if many nodes don’t.