[Lightning-dev] Dropping Tor v2 onion services from node_announcement

darosior darosior at protonmail.com
Tue Jun 1 22:18:42 UTC 2021

Hi all,

It's been almost 9 months since Tor v2 hidden services have been deprecated.
The Tor project will drop v2 support in about a month in the latest release. It will then be entirely be dropped from all supported releases by October.
More at https://blog.torproject.org/v2-deprecation-timeline .

Bitcoin Core defaults to v3 since 0.21.0 (https://bitcoincore.org/en/releases/0.21.0/) and is planning to drop the v2 support for 0.22 (https://github.com/bitcoin/bitcoin/pull/22050), which means that v2 onions will gradually stop being gossiped on the Bitcoin network.

I think we should do the same for the Lightning network, and the timeline is rather tight. Also, the configuration is user-facing (as opposed to Bitcoin Core, which generates ephemeral services) which i expect to make the transition trickier.
C-lightning is deprecating the configuration of Tor v2 services starting next release, according to our deprecation policy we should be able to entirely drop its support 3 releases after this one, which should be not so far from the October deadline.

Opinions? What is the state of other implementations with regard to Tor v2 support?


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