Return-Path: Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id D20E7C07FF for ; Fri, 8 May 2020 19:56:32 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id A838B26BE2 for ; Fri, 8 May 2020 19:56:32 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eGMeaCWLC9W5 for ; Fri, 8 May 2020 19:56:31 +0000 (UTC) X-Greylist: delayed 00:16:20 by SQLgrey-1.7.6 Received: from mail-oi1-f178.google.com (mail-oi1-f178.google.com [209.85.167.178]) by silver.osuosl.org (Postfix) with ESMTPS id DF3672673B for ; Fri, 8 May 2020 19:56:30 +0000 (UTC) Received: by mail-oi1-f178.google.com with SMTP id j16so9459670oih.10 for ; Fri, 08 May 2020 12:56:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=purse.io; s=google; h=to:cc:references:from:autocrypt:subject:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=11+gDZIa+1tA4TPehKPqgbYs59I/tVJWJrsyBF6NdGw=; b=J1xxtVKl7OPj/HhS3wvBtsYGBh5KgE1xeaEwRB92dZbRO7cRqHALIvTdII3EmIn4aC NjT/Q1mcJzmURr2ZzwC6WA0AHeO7OWLeYP8eEBukAXG20/WBjavK477PcbA3co6djNNg iXBpExLpoQrWjRYpCrv9/i7HUNM7jw7jIk3X4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:references:from:autocrypt:subject :message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding:content-language; bh=11+gDZIa+1tA4TPehKPqgbYs59I/tVJWJrsyBF6NdGw=; b=qybMb6KeGdKY7rg7Syrh3n3CV6IQf6Jlh4ruyDgN83cIQUy3cyn4vjOoiGvtlY7xRn JjWULD6Ve87IMVrMmRjg5VDaw4ET6oxfwRwOhWWHKii0OOK7B9TyV3rnUW88GTsVpPps 4QRNMBLU/tHxqJZgLN/nOSQQrOsbT0oz2KtIcyYo3RFDLfsG9WTuCRBYqPAed8le7Z/W u4ARJXVK8zk7yjxJkEqhEanfZRSr7li0qSGIqYMr8d2QV1TA5yB6ijhgLY7R+yWGivtD 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"lightning-dev\\\\@lists.linuxfoundation.org" Subject: Re: [bitcoin-dev] [Lightning-dev] On the scalability issues of onboarding millions of LN mobile clients 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: Fri, 08 May 2020 19:56:33 -0000 On 5/6/20 9:07 PM, Keagan McClelland wrote: > I think that one of the solutions here is to have light clients choose > their full node tethers explicitly. Even if you think it is unrealistic= to > have everyone run their own node (fwiw, I don=E2=80=99t), there is stil= l a trust > model where you can pick your trusted source. > > This way you could have many light clients working off of a family node= , > and the peer services could be limited to some sort of =E2=80=9Cauthent= icated=E2=80=9D > peers. Perhaps this is better accomplished over the RPC interface in Co= re, > but the idea is to have some sort of peer service model between =E2=80=9C= full > public=E2=80=9D and =E2=80=9Cowner only=E2=80=9D. This limits the amoun= t of costs that can be > properly externalized, without exposing risk of consensus capture by > economically weighty institutions. The RPC interface in Bitcoin Core, and others, is not great for this because it exposes a lot of functionality that isn't necessary and introduces risks. For example the `gettxoutsetinfo` can start a very intensive CPU and disk I/O task. There are several others, for example: `stop`, `addnode`, `clearbanned`, `setban`, and etc. Furthermore reading full raw blocks isn't very efficient with JSON. Electrum servers (e.g electrs) for example read blocks from disk instead and use the RPC interface to sync headers. Though, Electrum servers also have a risk of DoS with addresses that have many transactions, see the `--txid-limit` option [2]. [1]: https://github.com/bitcoin/bitcoin/blob/5b24f6084ede92d0f493ff416b4726245= 140b2c1/src/rpc/blockchain.cpp#L954-L956 [2]: https://github.com/romanz/electrs/blob/f0a7a325af495ecbc152c0866550dc3000= 11779b/src/query.rs#L284-L289