Earlier quoted context omitted.
Your name 'grishka' looks familiar. I'm also an ActivityPub developer ( https://quanta.wiki ). What languages do you develop in, in case we can share code?
Java for the back end, TypeScript for the very lightweight front end.
BTW we have spoken before. You are the developer of Smitherene, the only other ActivityPub implementation in Java other than my Quanta platform.
Your code was very helpful to me getting my impl working!