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Transaction Gatekeeper

Definition

A Transaction Gatekeeper is an entity or mechanism that controls or filters which transactions are allowed to proceed within a financial or blockchain system. In centralized systems, this role is often performed by banks or payment processors; in decentralized contexts, it could involve smart contracts or specific protocol rules. These gatekeepers enforce compliance, security policies, or network parameters, preventing unauthorized or malicious activities. They serve as a point of control within a transaction flow.