Sentinel

Sentinel is a Token-2022 Transfer Hook program that enforces customizable compliance rules atomically on every token transfer — no off-chain monitoring, no backend approval queue, no centralized gatekeeper. When a wallet calls transfer_checked on a Sentinel-protected mint, Token-2022 CPIs into Sentinel before the transfer settles, evaluating the sender's on-chain compliance record against an upgradeable ruleset and allowing or reverting the transaction atomically.