If anyone was curious how I generated a custom v3 onion address for our forum I used https://github.com/cathugger/mkp224o
On debian it's quite easy to run, here's the commands for the lazy
apt install gcc libc6-dev libsodium-dev make autoconf libssl-dev -y
git clone https://github.com/cathugger/mkp224o
cd mkp224o
bash ./autogen.sh
./configure
make
./mkp224o -d something -s some
Replace "something" with the output directory and "some" with what charcters you want the onion address to start with. I'm also using the -s flag to print out stats.
How long it takes to generate an onion depends on your CPU. Every character increases the generation time exponentially and anything beyond 9 characters is probably impossible.
One you've generated one just setup Tor how you normally would
HiddenServiceDir /var/lib/tor/hidden_service
HiddenServicePort 80 127.0.0.1:80
Then over write /var/lib/tor/hidden_service/hs_ed25519_secret_key with the contents of the hs_ed25519_secret_key file in your something/onion directory.
Also delete /var/lib/tor/hidden_service/hs_ed25519_public_key and /var/lib/tor/hidden_service/hostname
And restart tor
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