and as such because its deposited(preconfirmed) into a company that other businesses will trust. then INSTANT transactions can occur. either onchain or offchain.
offchain transactions are not bitcoin.
any business which will accept numbers stored in some companies database as bitcoin is basically using that company as a bank.
Some examples of this would be:
MtGox
BitStamp
BTC-E
CoinBase
history shows that eventually this bank company will start issuing more database bitcoins then there are actual bitcoins on the block chain (e.g fractional reserve).
So, if you had to venture a guess, which of the already existing "bitcoin banks" do you suppose are already engaged in fractional reserve?