Time-restricted ownership of NFTs

1. A system comprising:

at least one computer medium that is not a transitory signal and that comprises instructions executable by at least one processor to:

associate a time with at least one non-fungible token (NFT) establishing ownership of at least one digital asset, the time being associated with the NFT at least in part by indicating the time in metadata of the NFT and associating the metadata with the NFT, indication of ownership being effected at least in part by using a computer to add data to the metadata identifying at least one owner;

process the NFT using a computer to, based at least in part on the time, automatically terminate the ownership; and

offer the NFT for sale subsequent to terminating the ownership, the offer of the NFT for sale comprising sending plural advertisements via a computer game network to plural users that the NFT is available, the advertisements comprising at least one image related to the NFT and metadata comprising a list of prior owners of the NFT along with periods of time the respective prior owners possessed ownership of the NFT; and

require a player acquiring ownership of the NFT to retain ownership of the NFT at least in part by playing at least one computer game a certain period of time, or by employing the digital asset in a future particular tournament or event, or both playing at least one computer game a certain period of time and employing the digital asset in a future particular tournament or event.

2. The system of claim 1 , comprising the at least one processor.

3. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

an image of the digital asset; and

an offer to own the NFT for a limited time.

4. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

a selection to indicate a user is a spectator and cost of owning the NFT is a first price;

a selection to indicate a user is a game player and cost of owning the NFT is a second price.

5. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

an acceptance selector to indicate accepting terms of ownership of the NFT; and

a selector to automatically extend ownership of the NFT past the time for a limited period.

6. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

at least one image of the digital asset; and

notification of ownership of the digital asset.

7. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

notification at the elapse of the time that the NFT is back on the market for purchase.

8. The system of claim 1 , wherein the instructions are executable to:

present on at least one display at least one user interface (UI) comprising:

an entry field to enter a bid for the NFT.

9. The system of claim 1 , wherein the digital asset comprises a computer game asset.

10. The system of claim 9 , wherein the computer game asset comprises digital artwork.

11. The system of claim 9 , wherein the computer game asset comprises a computer game character.

12. The system of claim 1 , wherein the instructions are executable to:

require a player acquiring ownership of the NFT to retain ownership of the NFT at least in part by playing at least one computer game a certain period of time.

13. The system of claim 9 , wherein the computer game asset comprises a computer game event.

14. The system of claim 1 , wherein the instructions are executable to offer the NFT to an offeree at a first price responsive to the offeree being a player of a computer game and offer the NFT at a second price responsive to the offeree being a spectator of the computer game.

15. The system of claim 1 , wherein the instructions are executable for:

require a player acquiring ownership of the NFT to retain ownership of the NFT at least in part by employing the digital asset in a future particular tournament or event.

16. The system of claim 1 , wherein the instructions are executable for:

require a player acquiring ownership of the NFT to retain ownership of the NFT at least in part by both playing at least one computer game a certain period of time and employing the digital asset in a future particular tournament or event.