?url_ver=Z39.88-2004&rft_id=10.3390%2Ffi13110285&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=N.A.&rft.au=Akbar%2C+N.A.&rft.aulast=Akbar&rft.issn=19995903&rft.atitle=Distributed+hybrid+double-spending+attack+prevention+mechanism+for+proof-of-work+and+proof-of-stake+blockchain+consensuses&rft.title=Future+Internet&rft.issue=11&rft.date=2021&rft.volume=13&rft.genre=article