According to ckpool developer Dr. CK, a miner successfully mined Bitcoin block 887212 (block hash: 000000000000000000006414aea39be567cf1d5ff6cbf2d77254fe7c714b0d81) in solo.ckpool.org using only 3.3TH of computing power and a 480GH Bitaxe mining machine. The miner's address bc1qaxccz85rx6ywy2xw6ugtm6u37mvew6qqn7lgtd theoretically the probability of finding a block per day is less than one in a million, and it typically takes 3,500 years to find a block.