I have a basic question to ensure If I really have understood something.
Lets assume that person A wants to give person B 5 Bitcoins.
Do the miners have to walk through the entire Blockhain beginning from 2009 up to know to check my bank balance in order I have still 5 Bitcoins as balance ? If this is the case and maybe the half world would use bitcoins, there are endless blocks to be read to validate each transactions. ???
Thank you for anwering!