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I was wondering if there is a way to obtain public key of a public address where the address does not have any output transaction

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    Are you looking for the public key to your own address or someone else's?
    – Murch
    Jul 15, 2021 at 10:59
  • I'm looking for the public key of the btc puzzle
    – rage0920
    Jul 15, 2021 at 20:34

1 Answer 1

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I assume that you are talking about a Pay to Public Key Hash (P2PKH) address.

Cryptographic hash functions have the pre-image resistance property:

Given a hash value h, it should be difficult to find a message m for which h = hash(m).

P2PKH addresses encode a locking script that commits funds to the hash of a public key. Given that the address only provides the hash, it is not possible to guess the public key from the address as that would require breaking the pre-image resistance property of RIPEMD-160.

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  • So it is not possible to get the public key?
    – rage0920
    Jul 16, 2021 at 9:20
  • No, you cannot learn the original value if you only have a hash.
    – Murch
    Jul 18, 2021 at 16:22

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