since applied to blockchain technology, decentralization ensures that one actor has the authority to change or censor the transaction and that the network cannot be closed without tracking every node that runs the network and turns it off, while the blockchain itself ensures that, there is no doubling. proof work and postage mining evidence act as an act of Sybil that makes blockchain unmanageable by actors who create multiple signatures or accounts. that's where we should still believe in blockchain because this technology is very safe.