The zone of the order is an optional secondary account attached to the order with two additional privileges:
- The zone may cancel orders where it is named as the zone by calling
cancel. (Note that offerers can also cancel their own orders, either individually or for all orders signed with their current counter at once by callingincrementCounter). - "Restricted" orders (as specified by the order type) must be approved as indicated by a call to a
validateOrderwhen the caller is not the zone.
An example zone contract implementation can be found at /contracts/zones/PausableZone.sol.
The PausableZone contract can be used by its controller to cancel orders, execute fulfillment on restricted order, and pause all orders which use it as a zone.
New zones can be permissionlessly deployed and utilized to extend the feature set of the core Seaport marketplace. Examples include:
- Helping to prevent sales of compromised items
- Pausing orders in case of an emergency without invalidating approvals
- Limiting the number of NFTs from a particular collection that can be sold in a given amount of time
- Enforcing a particular floor or ceiling price for certain items
- Making arbitrary calls to outside data sources
- Tracking additional incentives for completing valid orders