there is a posible with a brute force attack's (theory) the problem how many ASIC do you need you for make that(using a pool for looking a private key with one address like target like Pizza's 10k BTC account for example)?.  do you have a SHA-256 when you are assuming that each HEX will not reply you can also use combinationhttps://betterexplained.com/articles/easy-permutations-and-combinations/ then you combine the mumber of hashing of one btc-miner(of course you need to modified it , like fpga programm for running within one big data databese like Apache Spark)  with the number of all posiblities and one bynary three search  for reduce the time to the half. https://algs4.cs.princeton.edu/32bst/  it is a lie that BTC it is unhacking , ich you have the real tools you can make it because the problem it is not the all posible combination is infinite . The problem is that one ordinary computer can not go well against that for this http://news.mit.edu/2009/explainer-pnp with normal mathematic can not found never in your life but with algorithms and one huge farm with modified ASIC (for example all the Asic miner just try to solve the puzzle of the  nonce .Instead of that we can modifed it for go against one private account ) . Maybe song like FUD but with this method are you using TNT instead of one hammer against the bitcoin algorithms.