Delivery-date: Fri, 03 Oct 2025 08:52:49 -0700
Sender: bitcoindev@googlegroups.com
Received-SPF: pass (google.com: domain of apoelstra@wpsoftware.net designates 66.183.0.127 as permitted sender) client-ip=66.183.0.127;
Date: Fri, 3 Oct 2025 13:59:43 +0000
From: Andrew Poelstra <apoelstra@wpsoftware.net>
To: /dev /fd0 <alicexbtong@gmail.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Re: [BIP Proposal] Limit ScriptPubkey Size >= 520
 Bytes Consensus.
Message-ID: <aN_Wz5YbZ9NieQu0@mail.wpsoftware.net>
References: <6f6b570f-7f9d-40c0-a771-378eb2c0c701n@googlegroups.com>
 <842930fb-bede-408a-8380-776d4be4e094n@googlegroups.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
	protocol="application/pgp-signature"; boundary="XHS6Ox6dadkPI3dr"
Content-Disposition: inline
In-Reply-To: <842930fb-bede-408a-8380-776d4be4e094n@googlegroups.com>
Precedence: list
Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com


--XHS6Ox6dadkPI3dr
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: inline

On Thu, Oct 02, 2025 at 06:21:18PM -0700, /dev /fd0 wrote:
> 
> We can't predict future usage,

Aside from proof-of-publication (i.e. data storage directly in the UTXO
set) there is no usage of script which can't be equally (or better)
accomplished by using a Segwit v0 or Taproot script.

> so it would be great if this was restricted 
> to OP_RETURN. While there is no real use for a scriptPubKey larger than 520 
> bytes as shown in the data you shared, it is possible that users may create 
> more OP_RETURN outputs after this change. It does not affect the UTXO set 
> but will cost more and economically discourage the use of multiple 
> OP_RETURN outputs. 
> 

Restricting it to OP_RETURN would have zero effect on people trying to
use scriptpubkeys for data storage. They would switch to any of the 65
or so other OP_RETURN equivalents, and failing that, switch to
OP_RESERVED, then to OP_FALSE, then to `0 1 EQVERIFY`, and so on. A
restriction that applies specifically to OP_RETURN outputs is no
restriction at all.


-- 
Andrew Poelstra
Director, Blockstream Research
Email: apoelstra at wpsoftware.net
Web:   https://www.wpsoftware.net/andrew

The sun is always shining in space
    -Justin Lewis-Webster

-- 
You received this message because you are subscribed to the Google Groups "Bitcoin Development Mailing List" group.
To unsubscribe from this group and stop receiving emails from it, send an email to bitcoindev+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/aN_Wz5YbZ9NieQu0%40mail.wpsoftware.net.

--XHS6Ox6dadkPI3dr
Content-Type: application/pgp-signature; name=signature.asc

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCgAdFiEEkPnKPD7Je+ki35VexYjWPOQbl8EFAmjf1s4ACgkQxYjWPOQb
l8G5Gwf/RA5bZsRcJhZN7Obb+aTAngRn7KIrpHMUJjWfn7CSRaEM9ej3L4Hhpkio
1pdpJmRCKWevYJHHXcswNI4pZYjFuiJJqqrsn9oTRIgWKTJXxseCVqLcE+6vGRk5
zI6RXFFJIvg9e8w3fFUrYNibSqgpUa9sEvzybHH53MmQ4TxKmXSXNpJ8ZlAa0lTT
51YCp/JMeSmJBB42wuIHMsWwANiQKDrMmXvZIo8Kz0yffxFnTTpdR3q6v6ojpwO+
JHZk7z2UEvDiQzlobTSToHVVMziRSX/s/IwBIwl/y3anasAhUoNRoYT+a17CRJ5z
aiN9EWeQnRm3FjFVA8JpPsZF/CJzrA==
=EPfI
-----END PGP SIGNATURE-----

--XHS6Ox6dadkPI3dr--