From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id D5DCFBB3 for ; Thu, 28 Sep 2017 15:45:52 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id EED3044D for ; Thu, 28 Sep 2017 15:45:51 +0000 (UTC) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 3437920DA6; Thu, 28 Sep 2017 11:45:51 -0400 (EDT) Received: from frontend1 ([10.202.2.160]) by compute1.internal (MEProxy); Thu, 28 Sep 2017 11:45:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sprovoost.nl; h= content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to:x-me-sender:x-me-sender:x-sasl-enc :x-sasl-enc; s=fm1; bh=LfN8rhqwhNfNW3mJ1jdOwvz9PQfmETzqPLXRZ97VW Tw=; b=LBKfCE1lDn6JmeUfBVclRyoO+9gjAG24GRjeOtBPJ643mFpWlxts3UmZx Km4+xcLUD9+p4QLRQT08oMcHKwd/F8J4aaqYHhG9MsijUko0e8KFS/JdZNLqmgdK 2XYUe3f0HA/QBm4BR54eZn+upzPIfXQ1k2pBLPgAyjDiqWpktb6zgjNg8mUCjdEp B4RXUs9Q0vqI0F9xMlCmTyi/rD1+ZuJKPMkwOU6gwLfck/U3T7DXVjy4IqIjwsv6 a1alXdXpcNKQUNV/VUsg4mElKlzGD6XRG+oFZidynsvS4uLxBNvxe72df/9Cw+hH occdNWA/j1NV5221PzE9FKJIOcxJQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-sender :x-me-sender:x-sasl-enc:x-sasl-enc; s=fm1; bh=LfN8rhqwhNfNW3mJ1j dOwvz9PQfmETzqPLXRZ97VWTw=; b=R/0Swp8b1gY+aMR6C8IiTf6n/dIAu44Pid g3Z1R+BR9+7G5neSQhiYM1VozN66CUJadOk7j7F/DyZB81XbUeme4aEkCUNnHCRJ vkP6I/2fMoxjccYap78obUwZHAVvv7Bp1vpiXVv6BNvPc38+cOhg5dRES2aDW8CP onFfFPZh0oJbaEuhlVaU0yuUiQQtQVe6x68MvLj4QBL1TjkY4SLUBQJETShU663T uXeYER0CGHkagMeslyU4o6K2RCI5WctZZOUpNQ08k7wazWEo1Ar3JxmZKZgZbuwm gfVK1UsGc4NG8ZQXF6FQpSuHMukRCgRqEx6bSVv/Cu6QY2BKEbuA== X-ME-Sender: X-Sasl-enc: UemNMzhYWJIZCo40YHbogkkfpranr6ODFDP0J1C8iV/C 1506613550 Received: from [192.168.0.108] (unknown [78.96.80.234]) by mail.messagingengine.com (Postfix) with ESMTPA id 4C9557E3BA; Thu, 28 Sep 2017 11:45:50 -0400 (EDT) From: Sjors Provoost Content-Type: multipart/signed; boundary="Apple-Mail=_FC300F55-83F4-4EDD-8CBC-5836E2EC1A32"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 11.0 \(3445.1.6\)) Date: Thu, 28 Sep 2017 18:45:47 +0300 References: <20170927160654.GA12492@savin.petertodd.org> <14496C9C-E291-4415-B07E-859853579D20@sprovoost.nl> To: Andreas Schildbach , Bitcoin Protocol Discussion In-Reply-To: Message-Id: <4745C5CF-AA3A-4614-99DA-DE3C985F3D69@sprovoost.nl> X-Mailer: Apple Mail (2.3445.1.6) X-Spam-Status: No, score=0.7 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,RCVD_IN_DNSWL_LOW,RCVD_IN_SORBS_WEB autolearn=disabled version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Thu, 28 Sep 2017 15:56:28 +0000 Subject: Re: [bitcoin-dev] Address expiration times should be added to BIP-173 X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Sep 2017 15:45:52 -0000 --Apple-Mail=_FC300F55-83F4-4EDD-8CBC-5836E2EC1A32 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Op 28 sep. 2017, om 18:06 heeft Andreas Schildbach via bitcoin-dev = het volgende geschreven: >=20 > On 09/28/2017 04:41 PM, Sjors Provoost via bitcoin-dev wrote: >=20 >>> The payment request message is just as one-way as an address is. It = is >>> already being emailed and printed on an invoice, in fact it often = acts >>> as the invoice. >>=20 >> True and the more complicated fields, like a digital signature, are = optional. Are you suggesting BIP-70 payment requests should be rendered = with bech32? How long would those be if it's just the address and = expiration date? >=20 > I've not yet progressed that far in segwit support, but I can't think = of > a reason why not. You can request coins to any script using the = payment > protocol. >=20 > Regarding size, I've had no problems putting (unsigned) payment = request > messages into QR codes. I doubt paying to a native segwit address will > change much in size. Protobuf is very efficient. Bech32 is just a replacement for Base58. It's not strictly SegWit = related. If I understand correctly the only reason it won't be used for = legacy addresses is to prevent confusion: https://www.youtube.com/watch?v=3DNqiN9VFE4CU https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki Regarding size I'm mostly curious how big it is on a screen or a = physical paper, as text, not as a QR code. This would involve = deserializing the protobuf and rendering the result in bech32. I does sound like there's overlap between BIP-70 and BIP-173 that should = be resolved. Perhaps any payment request can be rendered as bech32 and any bech32 = address can converted to a payment request. Maybe only for a limited set = of fields (address, expiration, amount). This would be a matter of = agreeing how the protobuf should be serialized and deserialized. In that = case the protobuf would not contain the literal bech32 address as a = string, but instead it would contain the underlying data (public key / = script hash, network, etc). Sjors --Apple-Mail=_FC300F55-83F4-4EDD-8CBC-5836E2EC1A32 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE7ZvfetalXiMuhFJCV/+b28wwEAkFAlnNGSsACgkQV/+b28ww EAlP1Q//f6SPursatGp4Jp/0HybgK/xl5PBqX29r0sQhhUa8PGxVVq31afok1lGh jnW2ed7OMZ9AS5hQYyN5QffgxgT+SPkOuHGHLuVMnyxtI6uZdO/jVxYF+Z4731Xy Z5mvrxF9XlslwEF2Bz8BEWgTueEp7F2wDz42RRuA/X2/1HZ+dk8vXOqxQlL+xnQU LB9Q8wBQVHlSqtyhkW7OvhY7+HiVSG/K00qLLPBvvm6cNMc6IVJhJQbithhJefEP KbELvgV8mqp7lZ4XLlqjJLekPmbwADkQFBk4SseVsyyiXrpXDD6NoI0Dxkd+k1xc Zx+Gqb6NjFygwTw4UXaIp8dsQAfVI/IE/qW51VDALZ05JfS1AYlfmDIm7oot65p9 rGvWq7FoLZCPKP24j5GZMZbnfqY3P7wIYFFMVu8UyTfmOeTRj9+EfGD1yaAvnjwB 9KnG6SSwnHRmUnpPJ53pj8Bp7jXCTOBsZ1JZ+HzkMUuSKOZ/cNXWo9+cyZ4ixH4z myOUOdALYnOuRqdx2USvhAo7wuw+Fi2tSBiGPR3tYw39BTUIjAY5JGFEVtW0oPmW VlhG2Kr6REVXXHxCBI6W8YlO2WoCrNkNvUbFtNMyoHNk+qCT2x5wngajwH7CEyhw qmZdH18A+Jty+AMGAJynJmmFuiYC6e96r535A5/mfCP4rpx+qqQ= =5UyY -----END PGP SIGNATURE----- --Apple-Mail=_FC300F55-83F4-4EDD-8CBC-5836E2EC1A32--