Still unsolved. The private key for this puzzle is an integer between 2^98 and 2^99 − 1, and whoever finds it can sweep 9.91257338 BTC from 1JWnE6p6UN7ZJBN7TtcbNDoRcjFtuDWoNL.
Only the address is known, so a solver has to walk the interval: multiply the secp256k1 generator by each candidate key, hash the compressed public key with SHA-256 and RIPEMD-160, and compare with the address’s hash160. On average that is 2^97 tests, about 1.58e+29. A single high-end GPU running BitCrack or keyhunt manages roughly a billion tests per second.
Try cracking #99 in your browser How solvers really attack it