WRITE_ATTRIBUTION_* codes describe the per-write proof. A plain
INVALID_SIGNATURE or MISSING_AUTH on a write usually means the session
token is no longer known to the Personal Server (expired, or the server
restarted and dropped its in-memory sessions): open a new session.
Thrown when a write answered 401.
Remarks
WRITE_ATTRIBUTION_*codes describe the per-write proof. A plainINVALID_SIGNATUREorMISSING_AUTHon a write usually means the session token is no longer known to the Personal Server (expired, or the server restarted and dropped its in-memory sessions): open a new session.