On Saturday, August 28th, 2021 at 5:17 PM, ts via bitcoin-dev 
<bitcoin-dev@lists.linuxfoundation.org> wrote:

> Following up on my original proposal, I would like to get some more feedback 
> of the community
>
> to see if this could be realized at some point. Also, any recommendations as 
> to who to contact
>
> to get things rolling?

I honestly don't understand the point of what you're suggesting.

* If you're concerned about random typos, this is something already 
automatically protected against through the checksum (both base58check or 
bech32/bech32m).

* If you're concerned about accidentally entering the wrong - but honestly 
created - address, comparing any few characters of the address is just as good 
as any other. It doesn't even require the presence of a checksum. Looking at 
the last N characters, or the middle N, or anything except the first few, will 
do, and is just as good as an "external" checksum added at the end. For 
randomly-generated addresses (as honest ones are), each of those has exactly as 
much entropy.

* If you're concerned about maliciously constructed addresses, which are 
designed to look similar in specific places, an attacker can just as easily 
make the external checksum collide (and having one might even worsen this, as 
now the attacker can focus on exactly that, rather than needing to focus on 
every other character).

Things would be different if you'd suggest a checksum in another medium than 
text (e.g. a visual/drawing/colorcoding one). But I don't see any added value 
for an additional text-based checksum when addresses are already text 
themselves. This is even disregarding the difficulty of getting the ecosystem 
to adopt such changes.

Cheers,

--
Pieter

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