A further note for everyone, unless something drastically improves with being able to use a public key, such as BSGS, Kangaroo, etc., the 67, 68, and 69 wallets, are all easier reached (time wise) now versus 135.
The lower puzzles are now very risky ... Even if someone manages to crack one of them still they could be easily stolen.
It's better not to find a solution than get it and then being robbed right away.
Please stop this wallet stealing talk. Even if unintentionally, you are creating an invitation and letting more people know.
By the way, the difficulty level of puzzle 69 and 66 is the same, puzzle 69 the first digit is 1 and known , so on . this does make it 66 bit.
I guess everyone who is trying to solve one of the lower puzzles would like to know about the risk. I don't get your point that my previous post was "invitation" to stealing. Even if there is only few people hunting for that public key to be revealed the risk exists and it's better to know that.
BTW How can be 66bit and 69 bit at the same difficulty level ? Visualize 66 puzzle like you have 66 light switches on a wall. Every switch can be only in position on or off ( one or zero). To resolve the puzzle you must set every switch in a certain position (and of course in certain order)... now... how can adding three more switches keep the same level of difficulty ?