# MetaID PIN Conventions

#### About `modify`/`revoke`

1. The address initiating the `modify` or `revoke` must match the address of the creator of the old version of the PIN, and the PIN must not have been transferred. If the PIN has been transferred, any subsequent `modify`/`revoke` operations will be invalid. For PINs under the `/info` path, only the initiator's address and the address of the creator of the old version of the PIN need to match for modification.
2. The PIN being modified must be the current latest version of the PIN for the modification to be valid. If the PIN being modified is not the current latest version, all `modify`/`revoke` operations will be invalid.
3. The modified PIN and the newly modified PIN need to be packaged in different block heights to be valid. If the modified PIN and the newly modified PIN are packaged in the same block, the new modification will be invalid.
4. When the `operation` is `modify`/`revoke`, the `path` needs to point to the corresponding PIN, for example: `@{pinid}`. The pointed PIN must be a PIN that exists on the chain and has been packaged into a block for the `modify`/`revoke` to be valid. The targeted PIN must be in different block heights.

<figure><img src="/files/xNggxJhJCrpgBwQSKAtm" alt=""><figcaption></figcaption></figure>


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