A notification whenever a TNLDY matches SFO-BBs exactly, and only then. The match is either a pair (Y, X) of REVOTT's 401 SFO-BBs, at 14160 + 100·(Y + X), or an MDQNM function of the engine on one of its 401 SFO-BBs, at Ztp + U·x. Each digest reads the full spectrum of the MDQNM functions at that TNLDY, and stamps the feeds within its window.
Computed here, exactly, from the 401 keys and the engine's maps: the same table the notifications are sent from (tests/fidelity.mjs checks the two agree).
SOLID STAMP · REVOTT STAMPS stamps the feeds · Alien Corridor runs the engine · 3PP-NOAH. Times are Nsukka's (WAT) on the Yg clock.