Client‑side PoW: SHA‑1 with leading hex zeros (6/7/8) to mitigate spam.
Generated Token:
Using UTC timestamp (YYMMDDhhmmss) from toISOString().
Ephemeral key pair; signature is mandatory and discarded on send.
Public Key:
Signature:
Includes X-Hashcash and X-Ed25519-Sig headers; max 3 newsgroups.