?url_ver=Z39.88-2004&rft_id=10.1145%2F3419483&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Krol&rft.aufirst=M.&rft.issue=2&rft.volume=21&rft.date=15+June+2021&rft.issn=1533-5399&rft.atitle=Proof-of-Prestige%3A+A+Useful+Work+Reward+System+for+Unverifiable+Tasks&rft.title=ACM+Transactions+on+Internet+Technology+(TOIT)&rft.pages=1-27&rft.genre=article