## Done
- decoding of open messages
- server listen and decode loop
- request channel state
- fetch posts for hash replies

- [ ] UTF-8 handling seems to be a bit gnarly

- UTF-8 handling seems to be a bit gnarly

- [ ] check if `hash_response2_test` is supposed to fail

- keep map of active channel requests
  - new messages for open requests should be forwarded, etc.
- roll a keypair
- create posts