Non-fungible tokens

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Across
  1. 2. the document proving ownership of a house.
  2. 5. something that can be collected.
  3. 9. a written agreement between parties.
  4. 11. the code used for creating NFTs.
  5. 13. single, only one copy.
  6. 14. cannot be copied or duplicated.
  7. 16. a piece of art, real estate, a share: something which has value.
  8. 17. a piece of land, a space on Internet.
Down
  1. 1. can be made again and again.
  2. 3. characteristics.
  3. 4. something serving as proof, as representing something.
  4. 6. swap.
  5. 7. idea, concept
  6. 8. scarce.
  7. 10. skilled, imaginative, capable
  8. 12. the act of owning something.
  9. 15. most famous cryptocurrency.