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| author | Peter Todd <pete@petertodd.org> | 2023-08-04 17:39:03 +0000 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2023-08-04 17:39:11 +0000 |
| commit | 5ebfdae9ff8d69d764a62ac12995256280bf3b47 (patch) | |
| tree | db57253a16476de5e0039253f3602c646ae0f693 | |
| parent | 994cbfae6df60fa53d73027e6a85567cd753f630 (diff) | |
| download | pi-bitcoindev-5ebfdae9ff8d69d764a62ac12995256280bf3b47.tar.gz pi-bitcoindev-5ebfdae9ff8d69d764a62ac12995256280bf3b47.zip | |
[bitcoin-dev] BIP-352 Silent Payments addresses should have an expiration time
| -rw-r--r-- | 6b/4b93933f6ee78135476986d73e8c47166a8de5 | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/6b/4b93933f6ee78135476986d73e8c47166a8de5 b/6b/4b93933f6ee78135476986d73e8c47166a8de5 new file mode 100644 index 000000000..53b1e39e8 --- /dev/null +++ b/6b/4b93933f6ee78135476986d73e8c47166a8de5 @@ -0,0 +1,155 @@ +Return-Path: <pete@petertodd.org> +Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) + by lists.linuxfoundation.org (Postfix) with ESMTP id 1315EC0032 + for <bitcoin-dev@lists.linuxfoundation.org>; + Fri, 4 Aug 2023 17:39:11 +0000 (UTC) +Received: from localhost (localhost [127.0.0.1]) + by smtp3.osuosl.org (Postfix) with ESMTP id ED3996109B + for <bitcoin-dev@lists.linuxfoundation.org>; + Fri, 4 Aug 2023 17:39:10 +0000 (UTC) +DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org ED3996109B +Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, + unprotected) header.d=messagingengine.com header.i=@messagingengine.com + header.a=rsa-sha256 header.s=fm3 header.b=EONdZ48G +X-Virus-Scanned: amavisd-new at osuosl.org +X-Spam-Flag: NO +X-Spam-Score: -0.701 +X-Spam-Level: +X-Spam-Status: No, score=-0.701 tagged_above=-999 required=5 + tests=[BAYES_40=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, + RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, + RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] + autolearn=ham autolearn_force=no +Received: from smtp3.osuosl.org ([127.0.0.1]) + by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id AnfrYp9rfhWW + for <bitcoin-dev@lists.linuxfoundation.org>; 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Fri, + 4 Aug 2023 13:39:06 -0400 (EDT) +Received: by localhost (Postfix, from userid 1000) + id 6A6BF5F851; Fri, 4 Aug 2023 17:39:03 +0000 (UTC) +Date: Fri, 4 Aug 2023 17:39:03 +0000 +From: Peter Todd <pete@petertodd.org> +To: bitcoin-dev@lists.linuxfoundation.org +Message-ID: <ZM03twumu88V2NFH@petertodd.org> +MIME-Version: 1.0 +Content-Type: multipart/signed; micalg=pgp-sha512; + protocol="application/pgp-signature"; boundary="SB8PAdHnrhigqCwh" +Content-Disposition: inline +Subject: [bitcoin-dev] BIP-352 Silent Payments addresses should have an + expiration time +X-BeenThere: bitcoin-dev@lists.linuxfoundation.org +X-Mailman-Version: 2.1.15 +Precedence: list +List-Id: Bitcoin Protocol Discussion <bitcoin-dev.lists.linuxfoundation.org> +List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe> +List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/> +List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org> +List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help> +List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe> +X-List-Received-Date: Fri, 04 Aug 2023 17:39:11 -0000 + + +--SB8PAdHnrhigqCwh +Content-Type: text/plain; charset=us-ascii +Content-Disposition: inline +Content-Transfer-Encoding: quoted-printable + +tl;dr: Wallets don't last forever. They are often compromised or lost. When +this happens, the addresses generated from those wallets become a form of t= +oxic +data: funds sent to those addresses can be easily lost forever. + +All Bitcoin addresses have this problem. But at least existing Bitcoin +addresses aren't supposed to be reused. Silent Payments are: the whole poin= +t is +to have a single address that you can safely pay to multiple times, without +privacy concerns. Failing to make Silent Payment addresses eventually expir= +e in +a reasonable amount of time is thus a particularly harmful mistake. + +Fixing this is easy: add a 3 byte field to silent payments addresses, encod= +ing +the expiration date in terms of days after some epoch. 2^24 days is 45,000 +years, more than enough. Indeed, 2 bytes is probably fine too: 2^16 days is= + 180 +years. We'll be lucky if Bitcoin still exists in 180 years. + +Wallets should pick a reasonable default, eg 1 year, for newly created +addresses. Attempts to pay an expired address should just fail with a simple +"address expired". Lightning invoices are a good example here: while invoic= +es +does not require expiration from a technical point of view, they do expire = +for +similar UX reasons as applies to silent payments. + +--=20 +https://petertodd.org 'peter'[:-1]@petertodd.org + +--SB8PAdHnrhigqCwh +Content-Type: application/pgp-signature; name="signature.asc" + +-----BEGIN PGP SIGNATURE----- + +iQIzBAEBCgAdFiEE0RcYcKRzsEwFZ3N5Lly11TVRLzcFAmTNN7QACgkQLly11TVR +Lzcqag//XGfqhEuXQMff0t8/BdgkNuOlW0JVbDcbQkoqtlvjtKEQNSvhSCPO6CVk +8GXc59qBLGe0oz+O5BdRrwnymEGj3bu9cSLm9l9n/t/LPZ4i6/3TIG1t4f5VVvuD +jmFA/1/tneA7Gv6ZGj1pxbmpZ1XluhrGLRrLi52BPjbXExIIfzoJWjnVvhUSjzvO +X966+Kj3Y1iIe2BOUfncT/Ig0tViU0JfbGXsLD4skTc7Jn8VrUWvpp55DMy8cRuK +XtIu660reaFLJVsC67IsvZJdTJR++Jsa4lhIuoCNnRLU50YyVckdUlsoOiZcfI0v +W5pC28fIcf3CAIjUDJMV3sp7DdEhNH8MTFGngZHuGqNLnj3KRbQ55bBkaUlliKNn +NRxoLebKLenbGweO7mxT4BMa0K4N3GA/7Pan4HYF4/p7soGjvTO/j8Lh/EqYvoF2 +c4KF0LlHfnnCaHlAflIgar1RsnQ0dBZtA439sDQhKaGc2dkevsztU+gj9PDqNPRv +eaW6NLwhgbU8VV1iR6qeF11tPe8nfP+fpK0Abz3zYWnsnPttG1OvUVhAWJGxjNrp +SD+zTi4Q5WSJ9JnFP70Eep4CXtC2qwWSRUxMKCg5jsJtGrhzi3yMRXzYegRweO+A +mc5dv37uTGnc5Le981X+TbQI77AKxbajXd5jY/irCK59WnoVFOg= +=2pUB +-----END PGP SIGNATURE----- + +--SB8PAdHnrhigqCwh-- + |