[Bitcoin-development] RFC: extend signmessage/verifymessage to P2SH multisig

[Alan Reiner]

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On 04/14/2013 02:25 AM, Peter Todd wrote:
> On Sun, Apr 14, 2013 at 01:21:21AM -0400, Alan Reiner wrote:
>> If we're going to extend/expand message signing, can we please add a
>> proper ASCII-armored format for it?  Really, anything that encodes the
>> signed message next to the signature, so that there's no ambiguities
>> about what was signed.  You can keep the "bare signatures" as an option
>> for backwards compatiblity, but offer this as the primary one.
>>
>> What we really want is to have the user copy an ASCII-armored block of
>> text into the client (or we could have a URI-extension for this), and
>> the app pops up with a window that says "The following message has a
>> valid signature from address 1XKjf32kJbf...:   <message>". 
>
> I already looked into ASCII-armoring PGP style for a different project.
> (timestamping) Basically you'd want to follow RFC2440, section 7
> "Cleartext signature framework":
>
> -----BEGIN BTC SIGNED MESSAGE-----
>
> Hello world!
> -----BEGIN BTC SIGNATURE-----
> IKBeCbxXHvD1TJh8ZlMySo26w5z6YZQD1xqKgbhsvlhEgcFD+kvKx4LzUz1yxg/8
> IdYdBnzez77VDq3odHrVftg=
> -----END BTC SIGNATURE-----
>
> Pretty simple really and doesn't need to be done prior to other
> signmessage changes. There may be an issue passing \r's through the RPC
> interface; the RFC specifies CRLF line endings.
>
Perfect.  That was the spec I was looking for but too lazy to find it. 
I guess I'll lead by example and just do it in Armory.  I'll let users
pressure the other devs to follow :)

- -Alan
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