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## What changed Verify every Nostr EVENT received by buzz-acp immediately after deserialization. Events with an invalid NIP-01 ID or Schnorr signature are dropped before subscription routing, deduplication, replay-watermark updates, membership handling, or either harness queue. ## Safety Signature verification runs on the blocking pool so cryptographic work does not block the relay task. A verification failure drops only that event and keeps the connection available for subsequent valid traffic. The existing observer-control verification remains as defense in depth. Regression tests cover valid delivery; changed content, ID, signature, pubkey, tags, and timestamp; a forged owner shutdown command with a recomputed ID; forged membership notifications; and forged observer-control events. ## Testing cargo test -p buzz-acp cargo clippy -p buzz-acp --all-targets -- -D warnings just ci --------- Signed-off-by: Jordan Mecom <jm@squareup.com>