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Tue, 14 Jun 2022 11:34:37 -0400 (EDT) Received: by localhost (Postfix, from userid 1000) id DA3C020D53; Tue, 14 Jun 2022 11:34:36 -0400 (EDT) Date: Tue, 14 Jun 2022 11:34:36 -0400 From: Peter Todd To: "Undiscussed Horrific Abuse, One Victim of Many" , Bitcoin Protocol Discussion Message-ID: References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Kma3SPeoRP6GyPwO" Content-Disposition: inline In-Reply-To: Subject: Re: [bitcoin-dev] Why OpenTimestamps does not "linearize" its transactions X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Jun 2022 15:34:44 -0000 --Kma3SPeoRP6GyPwO Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 14, 2022 at 08:45:43AM -0400, Undiscussed Horrific Abuse, One V= ictim of Many via bitcoin-dev wrote: > > The basic service that a timestamp service provides is =E2=80=9Cthis co= ntent (or at > > least a digest of this content) existed at least as early as this > > timestamp.=E2=80=9D It says nothing about how long before the timestamp= the content >=20 > OTS needlessly adds the requirement that the user publicize their .ots > files to everybody who will make use of the timestamp. > > This does not provide the service you describe. It would be trivial to > include enough cryptographic information in the original OP_RETURN, so > as to obviate the need for publicizing the .ots file. That approach does not scale. Via merkle trees, the OpenTimestamps system routinely timestamps tens of thousands of messages with a single transactio= n: https://petertodd.org/2016/opentimestamps-announcement#scalability-through-= aggregation Client-side validated .ots files are a necessary requirement to achieve this scalability. FWIW the most I've personally done is timestamped 750 million items from the Internet Archive with a single transaction. > If I send my .ots file to another party, a 4th party can replace it > with their own, because there is no cryptographic pinning ensuring its > contents. This changes the timestamp to one later, no longer proving > the earliness of the data. They can also simply delete their copy of the data, making it impossible to prove anything about it. --=20 https://petertodd.org 'peter'[:-1]@petertodd.org --Kma3SPeoRP6GyPwO Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEFcyURjhyM68BBPYTJIFAPaXwkfsFAmKoqogACgkQJIFAPaXw kfvKwwgAo6teG9MEm1DL5W0VB/SRoJVjUz1wpaZUNgPYDzNZlFDJcQdIorJTxrnZ KRfvK0b28VXbvVp3aVrnPfQysYsrTS0GgKIK+wS0F7hxfCgq5Y3kg3fsCLvWU25S SMrSnqBNId9kKLBCpsM7W2StxYmEo1NklyDmF4O5NkjSz8h7mV1rcJZCL2mCXWub mbbn0y5c52AWkSTRbRliCfFSaNgQIXa/um2TggnEjUdV+whqURynEy4QjYlE2CXI /2oFcNwFa98vfEuxMT6pNgU6g9q1TMEBEmddd77Wihk6eXtI6glEJkQUXdK+mTwW YLrVEX41xBSUFCKcE+W5RQfiBEPppA== =3ztn -----END PGP SIGNATURE----- --Kma3SPeoRP6GyPwO--