The method they used of encoding the transactions into the output value of the transaction could be done a LOT cheaper if they just mine transaction hashes with

The method they used of encoding the transactions into the output value of the transaction could be done a LOT cheaper if they just mine transaction hashes with 16-bits of prefixed data. It's not that hard to create a transaction over and over until you get the first 16-bits of it's hash exactly as you want (in essence this is basically what Bitcoin mining is, just simply on blocks instead of txs) Also they could just do it with 4 transactions at 8-bits each too.