Public PGP key - Ilya Mikheev 83739FC973D65212
Matrix - @themasterbun:ilyamikcoder.com
XMPP - @ilyamikcoder@ilyamikcoder.com
Below are WWW things, that may be not so relevant:
Mastodon - @ilyamikcoder@ilyamikcoder.com (mostly RU, may change in future)
Retrospring - @ilyamikcoder (AMA!)
Lower are proprietary things, that are absolutely not relevant (but may be useful):
Discord - ilya.mikheev.coder#9359