From rusty at rustcorp.com.au  Fri Jul 19 06:12:51 2019
From: rusty at rustcorp.com.au (Rusty Russell)
Date: Fri, 19 Jul 2019 15:42:51 +0930
Subject: [Lightning-dev] [PROPOSAL] Removal of proposal to make CSV
	delay symmetric
In-Reply-To: <CAMXsxZOGNUAbuUNbPtY_US_K2paEcNs05ZQU1PnOj3uWq990Eg@mail.gmail.com>
References: <877e8hmom0.fsf@rustcorp.com.au>
	<CAMXsxZOGNUAbuUNbPtY_US_K2paEcNs05ZQU1PnOj3uWq990Eg@mail.gmail.com>
Message-ID: <87tvbi8sd8.fsf@rustcorp.com.au>

Pierre <pm+lists at acinq.fr> writes:
> Hi Rusty,
>
> How would bruteforcing on the CSV delay be different from a BIP32
> wallet with look ahead keys? Especially given that we could try with
> most probable values first.

It's a big multiplier, given that CSV can be specified by the
counterparty.  If you accept up to 1024 and offer 144, that's 880
variants to look for, per key.

It also can't be done with a normal bitcoin wallet, which is unfortunate
too.

Cheers,
Rusty.