PHILIPPOPOULOS, Pericles; RICOTTONE, Alessandro; G. OLIVER, Carlos. Difficulty Scaling in Proof of Work for Decentralized Problem Solving. Ledger, [S. l.], v. 5, 2020. DOI: 10.5195/ledger.2020.194. Disponível em: https://ledgerjournal.org/ojs/ledger/article/view/194. Acesso em: 8 dec. 2025.