tl;dr: 1. ssh sends the pubkey you use on github ^1 2. his server compare with the publicly ^2 available pub key you uploaded to github.com ^1 (not mine, i s

tl;dr: 1. ssh sends the pubkey you use on github ^1 2. his server compare with the publicly ^2 available pub key you uploaded to github.com ^1 (not mine, i set keys per domain) ^2 news to me!