Wouldn't they have to crack the private key by the time the block is mined? Otherwise that transaction would already be sent to another address? I don't have a good idea how long it would take supercomputers to crack a single private key, so I don't know if 13,000x faster would be fast enough, but I don't think it would.
The private key is a 256-bit number. I don't think even 13,000x faster than supercomputers is going to get your cracking time under the time for a 10-minute block. 2^256 is a really, really, really big number.
The private key is a 256-bit number. I don't think even 13,000x faster than supercomputers is going to get your cracking time under the time for a 10-minute block. 2^256 is a really, really, really big number.