What you will do with unused token, is there any token burning sort of thing?

https://medium.com/@arpa/arpa-monthly-report-february-progress-review-44656adaa442

Token Burn

ARPA Foundation bought back burnt 10,000,000 ARPA tokens from the market which was worth $ 90,000 at the time The burnt token has been transferred to the corresponding black hole address: 0x168115cf806009f8984f47c90033e9a9705b4f65

This was the sixth monthly burn of the ARPA Foundation.