I think it would be more akin to bip70. I have a similar proposal, largely
already written up around this. I'm very interested in having this for
multi signature wallets.
On 14 Sep 2015 8:06 pm, "Arthur - bitcoin-fr.io via bitcoin-dev" <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hi,
> I realized that there isn't any way to ask for a signature (or to verify a
> message) as easily you can do when requesting a payment using a bitcoin URI
> scheme (BIP0021).
> I think a URI scheme to use the signing tools in bitcoin core might be
> useful, and with a proper consensus it could become available in most
> bitcoin clients who already support message signing/verifying and payment
> url (or QRCode) and enable new uses of bitcoin signatures.
> A way to gain proper consensus is going through a BIP, so that's why I'm
> here: to present my idea publicly before going any further (draft BIP and
> reference implementation).
> Some thoughts
>  - like BIP0021: "Bitcoin clients MUST NOT act on URIs without getting the
> user's authorization." so signing requires the user to manually approve the
> process
>  - it could use the same URI scheme than BIP0021 with an additional
> parameter (ex: signaction=<verify/sign>) or use another one like BIP121
> (ex: btcsig:)
> PS : I'll also post a topic in "Development & Technical Discussion"
> section on Bitcointalk
>
> --
> Arthur Bouquet
>
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