[Standards] Proposed XMPP Extension: Extensible In-Band Registration

Sam Whited sam at samwhited.com
Mon Feb 13 15:24:47 UTC 2017


On Mon, Feb 13, 2017 at 7:28 AM, Goffi <goffi at goffi.org> wrote:
> - proof of work would be really nice, with a fallback mechanism.

If by a "fallback mechanism" my understanding is correct and you mean
"something to fall back too if the client does not support the
particular proof-of-work function the server is asking it to compute",
we can't do this.
If you allow fallback, spammers just won't support the POW function
and will register a ton of accounts anyways. If a server advertises
that it requires a POW calculation before registration can be
completed, it will need to always require support in all clients that
register on that server.

—Sam


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