# Guardian provers

By [briq)master](https://paragraph.com/@briq-master) · 2024-01-22

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**Prover availability**
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A potential vulnerability of the contestation design is the lack of active higher-tier provers, especially since contestations are infrequent. To maintain a pool of available high-tier provers, Taiko introduces a **mechanism that randomly assigns a minimum required tier for each new block**. The likelihood of a block being assigned a higher tier is inversely proportional to the tier level; for instance, only 5% of blocks might require SGX+ZKP, while 20% demand ZKP, leaving the majority to require just SGX. This ensures that ZK provers always have work to keep them engaged and profitable.

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*Originally published on [briq)master](https://paragraph.com/@briq-master/guardian-provers)*