Hi!
As the title says, what happens if i get an address wrong? Do the coins get lost?
If that's what happens, why not change the code in Bitcoin, so that if the bitcoin network cant detect that address, returns the bitcoins to you?
Bitcoin transactions are irreversible. While this may be very inconvenient at times, it prevents scammers doing charge backs on PayPal transactions while using credit cards. If you think about it another way, how would the block-chain know you sent bitcoins to the wrong address? It could be that someone buys goods with bitcoins, pays the guy and then a day later tries to get his bitcoins back claiming he sent them to the wrong address.