I don't understand the first one but regarding the last two, isn't it extremely difficult and impossible to break ECDSA and Sha256 encryption? I am sure if there was some fault it would of been discovered long ago.

Yeah that would be like someone offering to pay $1M if someone could crack the private key of one of Satoshi's early mined blocks. Basically its pretty much impossible and hence the $1M reward would never be paid and would be a big waste of time for anyone attempting to crack it.