Forward monitors (Sec3 WatchTower, Custos Nox) watch NEW durable nonces. Ghostnonce is the retrospective baseline, a mail-in dossier of every live durable nonce where your listed signer keys are authority, with funder and creation enrichment, Solscan links, close hints, and a report hash. Honest zero if none. Not continuous monitoring.
Durable nonces are easy to lose track of across multisig operations. Ghostnonce was built to give signers a one-shot, evidence-backed baseline of current live nonce authorities before relying on forward monitoring. It is intentionally retrospective, not a continuous monitoring service.