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