[bitcoin-dev] BIP for Legacy Sign Verify functions

Luke Dashjr luke at dashjr.org
Thu Dec 21 23:09:05 UTC 2017

On Thursday 21 December 2017 10:26:25 PM Dan Bryant via bitcoin-dev wrote:
> https://github.com/brianddk/bips/blob/legacysignverify/bip-0xyz.mediawiki

It's not even correct... Your first "verify message" step is not possible; you 
can't get a public key from an address.

What is actually done, is using the signature + message to perform key 
recovery, to extract the public key of the signer, and then hashing that and 
comparing it to the address provided.

> Although this is a well established functionality, it has never been
> published in a BIP.  My proposal is simply to provide a reference point for
> future expansion of these capabilities into new address schemes.

New schemes should probably NOT be based on the current one.


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