3

If I have secp256k1 keypair that is widely known, like a Bitcoin address, can I convert that into a Ed25519 key pair such that someone could access a .onion address in a deterministic way?

1

The bitcoin key could sign a message containing the onion address. There are several other alternatives but there isn't any way to do this without the key holder producing a message of some kind.

  • Thanks. It makes sense now that I think about it because there is no way to get the ECC coordinates from the hashed address alone. – Kristopher Ives Feb 27 at 4:36
  • 2
    Even if you had the full public key, you can't convert it to a ed25519 public key in such a way that the private key can be converted in a compatible manner. The secp256k1 and ed25519 have different structure. – Pieter Wuille Feb 27 at 7:02
-1

No you can't convert them since they are defined over different curves.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.