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What is preventing me from simply constructing a hash that's lower than the current target?



The 2019 Stack Overflow Developer Survey Results Are InHow do the clients agree on the target to hash for?How is a block header hash compared to the target (bits)?How does mining process takes Approximately 10 minutes?if a Bitcoin mining nounce is just 32 bits long how come is it increasingly difficult to find the winning hash?What is #Hash in bitcoin from a layman's perspective?Why the nonce is difficult to find in Bitcoin?Calculating the target from the hash leading off bitsWhat is the exact input for the hash function?What is a good resource to learn about bitcoinMining: what is the lowest possible target? Could it be a block hash of all zeros?










1















I just started learning about Bitcoin, and something I can figure out is why miners have to use a random process (hashing a nonce) to get lower than the target. For example, if the target is



00000000000001ae00000000000000


why not just produce



000000000000000000000000000001


to become the winner? I have no practical experience mining, I'm guessing my ignorance lies in the requirements of how a hash is produced. If so, where can I found about those requirements? Thanks.




EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.










share|improve this question









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    1















    I just started learning about Bitcoin, and something I can figure out is why miners have to use a random process (hashing a nonce) to get lower than the target. For example, if the target is



    00000000000001ae00000000000000


    why not just produce



    000000000000000000000000000001


    to become the winner? I have no practical experience mining, I'm guessing my ignorance lies in the requirements of how a hash is produced. If so, where can I found about those requirements? Thanks.




    EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.










    share|improve this question









    New contributor




    Zduff is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      1












      1








      1








      I just started learning about Bitcoin, and something I can figure out is why miners have to use a random process (hashing a nonce) to get lower than the target. For example, if the target is



      00000000000001ae00000000000000


      why not just produce



      000000000000000000000000000001


      to become the winner? I have no practical experience mining, I'm guessing my ignorance lies in the requirements of how a hash is produced. If so, where can I found about those requirements? Thanks.




      EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.










      share|improve this question









      New contributor




      Zduff is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I just started learning about Bitcoin, and something I can figure out is why miners have to use a random process (hashing a nonce) to get lower than the target. For example, if the target is



      00000000000001ae00000000000000


      why not just produce



      000000000000000000000000000001


      to become the winner? I have no practical experience mining, I'm guessing my ignorance lies in the requirements of how a hash is produced. If so, where can I found about those requirements? Thanks.




      EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.







      mining-theory hash






      share|improve this question









      New contributor




      Zduff is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      Zduff is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 3 hours ago







      Zduff













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      asked 3 hours ago









      ZduffZduff

      1085




      1085




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      New contributor





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          2 Answers
          2






          active

          oldest

          votes


















          2















          EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.




          When determining whether or not a block is valid, each and every bitcoin node on the network will take the header of that block, and run it through a hashing algorithm to see what the output is. If the output is lower than the target value, then the block is valid (assuming that the rest of the block is also valid, of course).



          Notice something important: the hash value itself is not explicitly stored in the block. So you cannot just append some fabricated value that falls below the target value onto the block in lieu of a valid PoW. To create a valid block, you must construct it such that all other network nodes can independently verify it as being valid, and to do so, they use a hash function.



          As Pieter mentioned, hash functions are unpredictable 'one-way' functions. The only way to find a valid output is by trying a huge number of possible inputs, and 'getting lucky', so to speak.






          share|improve this answer






























            2














            Hash functions are unpredictable.



            You can't simply find an input to the hash function that produces such an output. The only way to accomplish that is by trying lots and lots of candidate blocks as input. If the target is 1000 times smaller, it requires 1000 times as many tries.






            share|improve this answer























            • Deleted comment. Please see edit to question.

              – Zduff
              3 hours ago











            Your Answer








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            2 Answers
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            active

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            2 Answers
            2






            active

            oldest

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            active

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            active

            oldest

            votes









            2















            EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.




            When determining whether or not a block is valid, each and every bitcoin node on the network will take the header of that block, and run it through a hashing algorithm to see what the output is. If the output is lower than the target value, then the block is valid (assuming that the rest of the block is also valid, of course).



            Notice something important: the hash value itself is not explicitly stored in the block. So you cannot just append some fabricated value that falls below the target value onto the block in lieu of a valid PoW. To create a valid block, you must construct it such that all other network nodes can independently verify it as being valid, and to do so, they use a hash function.



            As Pieter mentioned, hash functions are unpredictable 'one-way' functions. The only way to find a valid output is by trying a huge number of possible inputs, and 'getting lucky', so to speak.






            share|improve this answer



























              2















              EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.




              When determining whether or not a block is valid, each and every bitcoin node on the network will take the header of that block, and run it through a hashing algorithm to see what the output is. If the output is lower than the target value, then the block is valid (assuming that the rest of the block is also valid, of course).



              Notice something important: the hash value itself is not explicitly stored in the block. So you cannot just append some fabricated value that falls below the target value onto the block in lieu of a valid PoW. To create a valid block, you must construct it such that all other network nodes can independently verify it as being valid, and to do so, they use a hash function.



              As Pieter mentioned, hash functions are unpredictable 'one-way' functions. The only way to find a valid output is by trying a huge number of possible inputs, and 'getting lucky', so to speak.






              share|improve this answer

























                2












                2








                2








                EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.




                When determining whether or not a block is valid, each and every bitcoin node on the network will take the header of that block, and run it through a hashing algorithm to see what the output is. If the output is lower than the target value, then the block is valid (assuming that the rest of the block is also valid, of course).



                Notice something important: the hash value itself is not explicitly stored in the block. So you cannot just append some fabricated value that falls below the target value onto the block in lieu of a valid PoW. To create a valid block, you must construct it such that all other network nodes can independently verify it as being valid, and to do so, they use a hash function.



                As Pieter mentioned, hash functions are unpredictable 'one-way' functions. The only way to find a valid output is by trying a huge number of possible inputs, and 'getting lucky', so to speak.






                share|improve this answer














                EDIT: For clarity, I mean this in the sense of what part of the technology requires me to use a hash function? As opposed, to just constructing something that looks like a valid hash.




                When determining whether or not a block is valid, each and every bitcoin node on the network will take the header of that block, and run it through a hashing algorithm to see what the output is. If the output is lower than the target value, then the block is valid (assuming that the rest of the block is also valid, of course).



                Notice something important: the hash value itself is not explicitly stored in the block. So you cannot just append some fabricated value that falls below the target value onto the block in lieu of a valid PoW. To create a valid block, you must construct it such that all other network nodes can independently verify it as being valid, and to do so, they use a hash function.



                As Pieter mentioned, hash functions are unpredictable 'one-way' functions. The only way to find a valid output is by trying a huge number of possible inputs, and 'getting lucky', so to speak.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 3 hours ago









                chytrikchytrik

                7,3822628




                7,3822628





















                    2














                    Hash functions are unpredictable.



                    You can't simply find an input to the hash function that produces such an output. The only way to accomplish that is by trying lots and lots of candidate blocks as input. If the target is 1000 times smaller, it requires 1000 times as many tries.






                    share|improve this answer























                    • Deleted comment. Please see edit to question.

                      – Zduff
                      3 hours ago















                    2














                    Hash functions are unpredictable.



                    You can't simply find an input to the hash function that produces such an output. The only way to accomplish that is by trying lots and lots of candidate blocks as input. If the target is 1000 times smaller, it requires 1000 times as many tries.






                    share|improve this answer























                    • Deleted comment. Please see edit to question.

                      – Zduff
                      3 hours ago













                    2












                    2








                    2







                    Hash functions are unpredictable.



                    You can't simply find an input to the hash function that produces such an output. The only way to accomplish that is by trying lots and lots of candidate blocks as input. If the target is 1000 times smaller, it requires 1000 times as many tries.






                    share|improve this answer













                    Hash functions are unpredictable.



                    You can't simply find an input to the hash function that produces such an output. The only way to accomplish that is by trying lots and lots of candidate blocks as input. If the target is 1000 times smaller, it requires 1000 times as many tries.







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 3 hours ago









                    Pieter WuillePieter Wuille

                    48.2k3100162




                    48.2k3100162












                    • Deleted comment. Please see edit to question.

                      – Zduff
                      3 hours ago

















                    • Deleted comment. Please see edit to question.

                      – Zduff
                      3 hours ago
















                    Deleted comment. Please see edit to question.

                    – Zduff
                    3 hours ago





                    Deleted comment. Please see edit to question.

                    – Zduff
                    3 hours ago










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