Yesterday, somebody (maybe the owner) increased the unsolved bitcoin puzzles prizes again by x10. Now the puzzle #66 prize is 6.6 BTC, #67 is 6.7 BTC and so on… puzzle #160 prize is 16 BTC.

Here's the transaction https://www.blockchain.com/explorer/transactions/btc/12f34b58b04dfb0233ce889f674781c0e0c7ba95482cca469125af41a78d13b3

For those who aren't aware, in 2015, in order to show the hugeness of the private key space (or maybe just for fun), someone created a "puzzle" where he chose keys in a certain smaller space and sent increasing amounts to each of those keys like this:

20 ≤ random key < 21 — 0.001 BTC

21 ≤ random key < 22 — 0.002 BTC

23 ≤ random key < 23 — 0.003 BTC …

2255 ≤ random key < 2256 — 0.256 BTC (total 32.896 BTC)

First 65 and #70, #75, #80, #85, #90, #95, #100, #105, #110, #115 private keys have already been cracked.