On Wed, Mar 8, 2017 at 1:20 PM, Jonas Schnelli via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote: > >> Am 08.03.2017 um 22:09 schrieb Eric Voskuil <e...@voskuil.org>: >> >> On 03/08/2017 11:47 AM, Jonas Schnelli wrote: >>>>> Nodes are by design not supposed to be identifiable in any way >>>> >>>> This is of course my objection to BIP150 ("a way for peers to ... >>>> guarantee node ownership“).
I believe this discussion is getting sidetracked. There is a difference between identification/fingerprinting (who are you?) and proving identity (prove that you are who I think you are?). BIP150 only facilitates the second, not the first. I don't think you disagree about that, but I want to make it clear for anyone else following the discussion. The question is whether it encourages people to establish known and pre-shared identities for nodes. Perhaps, but not in any way that IP/onion addresses don't already. Think about it: * If you know an IP/onion address, you can verify whether some node has it. If you know an IP/onion address + BIP150 PSK, you can verify whether some node has it. * If you know 2 IP/onion addresses, you cannot figure out whether they correspond to the same node (and if you can, that is a bug, not by design). If you know 2 (IP/onion addresses, BIP150 PSK) pairs, you cannot figure out whether they correspond to the same node (and if you can, that is a bug, not by design). * If you receive a connection from a node, you cannot know what their onion address is. If you receive a connection from a node, you cannot figure out what their PSK is. In that way, I see BIP150 as an extension of IP addresses, except more secure against network-level attackers. If you believe the concept of people establishing links along existing trust lines is a problem, you should be arguing against features in Bitcoin software that allows configuring preferred IP addresses to connect to as well (-addnode and -connect in Bitcoin Core, for example). Cheers, -- Pieter _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev