Definition ∞ Revocation tokens are cryptographic instruments used to invalidate or withdraw previously granted permissions or access rights in a digital system. In certain blockchain or decentralized identity contexts, these tokens enable the issuer or a designated authority to unilaterally revoke a credential, certificate, or access privilege. This mechanism provides a necessary control layer for managing dynamic permissions and responding to security incidents. They are distinct from nullifiers, which prevent double-spending, by focusing on the active withdrawal of authority.
Context ∞ Discussions about revocation tokens appear in news concerning decentralized identity solutions, verifiable credentials, and access control mechanisms within Web3 applications. Debates often address the balance between decentralization and the need for a central point of control for revocation, especially in regulated environments. The development of robust and efficient revocation systems is crucial for the practical adoption of self-sovereign identity technologies.
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