Hello, you can join the "btcpuzzle.info" website with the 100% open source "bitcrackrandomiser" tool. We haven't completed a year yet, but we have completed 11% of the keys. (in Puzzle 66)

Btcpuzzle.info is a solo pool, but the scanned ranges are shared. One lucky person gets the full prize. Bitcoin puzzle 66, 67 and 68 are supported.

BTC Puzzle website;
https://btcpuzzle.info/

Github repo;
https://github.com/ilkerccom/bitcrackrandomiser

Thanks.