Expirations

When a domain expires it enters a 28-day reverse auction where the price starts at $100,000 and gradually decreases to the standard renewal price.

The original owner retains the right to renew the domain at the regular price at any point, regaining full ownership without having to pay the auction price. This is intended to be a 'grace period'.

All metadata must be cleared before another owner can take over the NFD (via renew method). The UI will provide calls to unlink addresses and delete fields prior to the renew call if the data isn't already cleared.

When an NFD is expired, and someone clears the metadata, the MBR for the box storage used by that metadata is paid to the caller.

Automated services can take advantage of this and in return for them providing this decentralized service of clearing metadata, receive payment in the form of the returned MBR.