btw i can offer 115bit range only 1 key, for make this key i need 0.75btc for buying 3090rtx gpu's for my calc fast to within 7 days Smiley, but here no one have this for work of months to days Smiley
For me, to even consider it, I'd have to know your method/how you cut it to 115 with only 1 key. I don't doubt you can, just never seen it.
Best I did once was to cut it down to 108 bit, with 1 out of 2048 keys being in the range.
And couldn't do it for less than .50 btc
I guess we could see a mini-business appearing in the future of people selling reduced puzzle transaction keys, but this is obviously a very risky business too in the same way that bought wallet.dat brute-forcing is also high risk (and usually downright scam).
for 20 bit down = 1024*1024 = 1048576 pubkeys
~
1048576 and 1073741824 pubkeys with each other addition and mutiplication will return you 260 pubkeys apear where 16 pubkeys sure inside 10 bit down from main pubkey
these 260 pubkeys again played for get 30 bit down for 1/720 pubkeys
I don't get this tip. When I tried to shift down #120 by 20 bit I was looking at 2^20 total pubkeys generated from this. How do you manage to make do with only 260 or 720 of them? That's even less than the 1024 pubkeys I obtained from shifting 10 bits down.
Here is one tip, division equals twice as many pubkeys. Look at my post above, I can shift 16 bits down with the expense of only 2^15 keys, cutting the fat by half.
With brainless, who knows, he is a wizard at pubkey/range reduction.