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From: Kostas Karasavvas <kkarasavvas@gmail.com>
Date: Fri, 16 Apr 2021 22:15:28 +0300
Message-ID: <CABE6yHscUPAcyK58DvqhOnxSOoPMBAy9aMUmReJYSkBit-Mekg@mail.gmail.com>
To: Christopher Gilliard <christopher.gilliard@gmail.com>, 
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] BIP - limiting OP_RETURN / HF
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Hi Christopher,

Some feedback:

"OP_RETURN is limited to 40 bytes of data."
It is 80 bytes.

"A future BIP proposing such a layer two protocol will be forthcoming."
So what is this BIP about? Just saying that it would be a nice idea? This
BIP should be the one that would go through this L2 suggestion. If one root
OP_RETURN substitutes all the rest it should say how that would be done...
where would the merkle proofs be stored, what are the trust
assumptions that we need to make, etc.

"Objections to this proposal" section
I agree with others re hard-fork, which would be a good thing of course.
My main objection with this proposal is that I don't see a proposal. It
seems like wishful thinking... if only we could substitute all the
OP_RETURNs with one :-)

We have to make sure that a proposal like this (L2, etc.) would make sure
that there are incentives that justify the added complexity for the users.
Multisig is not the only way data could be stored the wrong way; P2PK,
P2PKH, P2SH, P2WPKH, P2WSH can also be used. If the incentives are not good
enough people would start using these UTXO-bloat-heavy alternatives.

There are a multitude of L2's (kind-of) that do this 'aggregation' of data
hashes using merkle trees. Factom is adding a single merkle root per
bitcoin block for the millions upon millions of records (of thousand of
users) that they keep in their network. Opentimestamps, tierion,
blockstacks and others do a similar thing. I have investigated several of
those in the past, for one of my projects, but I ended up using plain old
OP_RETURN because the overhead of their (L2-like) solution and trust
assumptions where not to my liking; at least for my use case. They were
pretty solid/useful for other use cases.

Unless the proposed L2 is flexible/generic enough it would really prohibit
this L2 innovation that OP_RETURN allowed (see above).



On Fri, Apr 16, 2021 at 4:32 PM Christopher Gilliard via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> I have created a BIP which can be found here:
> https://github.com/cgilliard/bips/blob/notarization/bip-XXXX.mediawiki
>
> I'm sending this email to start the discussion regarding this proposal. If
> there are any comments/suggestions, please let me know.
>
> Regards,
> Chris
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>


-- 
Konstantinos A. Karasavvas
Software Architect, Blockchain Engineer, Researcher, Educator
https://twitter.com/kkarasavvas

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Christopher,<div><br></div><div>Some feedback:</div><di=
v><br></div><div>&quot;OP_RETURN is limited to 40 bytes of data.&quot;</div=
><div>It is 80 bytes.</div><div><br></div><div>&quot;A future BIP proposing=
 such a layer two protocol will be forthcoming.&quot;</div><div>So what is =
this BIP about? Just saying that it would be a nice idea? This BIP should b=
e the one that would go through this L2 suggestion. If one root OP_RETURN s=
ubstitutes all the rest it should say how that would be done... where would=
 the merkle proofs be stored, what are the trust assumptions=C2=A0that we n=
eed to make, etc.</div><div><br></div><div>&quot;Objections to this proposa=
l&quot; section</div><div>I agree with others re hard-fork, which would be =
a good thing of course.=C2=A0 My main objection with this proposal is that =
I don&#39;t see a proposal. It seems like wishful thinking... if only we co=
uld substitute all the OP_RETURNs with one :-)</div><div><br></div><div>We =
have to make sure that a proposal like this (L2, etc.) would make sure that=
 there are incentives that justify the added complexity for the users. Mult=
isig is not the only way data could be stored the wrong way; P2PK, P2PKH, P=
2SH, P2WPKH, P2WSH can also be used. If the incentives are not good enough =
people would start using these UTXO-bloat-heavy alternatives.</div><div><br=
></div><div>There are a multitude of L2&#39;s (kind-of) that do this &#39;a=
ggregation&#39; of data hashes using merkle trees. Factom is adding a singl=
e=C2=A0merkle root per bitcoin block for the millions upon millions of reco=
rds (of thousand of users) that they keep in their network. Opentimestamps,=
 tierion, blockstacks and others do a similar thing. I have investigated se=
veral of those in the past, for one of my projects, but I ended up using pl=
ain old OP_RETURN because the overhead of their (L2-like) solution and trus=
t assumptions where not to my liking; at least for my use case. They were p=
retty solid/useful for other use cases.</div><div><br></div><div>Unless the=
 proposed L2 is flexible/generic enough it would really prohibit this L2 in=
novation that OP_RETURN allowed (see above).=C2=A0</div><div><br></div><div=
><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Fri, Apr 16, 2021 at 4:32 PM Christopher Gilliard via bitcoin=
-dev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-d=
ev@lists.linuxfoundation.org</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div dir=3D"ltr">I have created a BIP which can=
 be found here:=C2=A0<a href=3D"https://github.com/cgilliard/bips/blob/nota=
rization/bip-XXXX.mediawiki" target=3D"_blank">https://github.com/cgilliard=
/bips/blob/notarization/bip-XXXX.mediawiki</a><div><br></div><div>I&#39;m s=
ending this email to start the discussion regarding this proposal. If there=
 are any comments/suggestions, please let me know.</div><div><br></div><div=
>Regards,</div><div>Chris</div></div>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div><div>Konstantinos A. Karas=
avvas</div><div>Software Architect, Blockchain Engineer, Researcher, Educat=
or</div><div dir=3D"ltr"><a href=3D"https://twitter.com/kkarasavvas" target=
=3D"_blank">https://twitter.com/kkarasavvas</a><br></div></div></div></div>

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