Before revision: Public blockchains should be able to scale with respect to the number of nodes and to the transactions load. Despite the large research and experimental effort, all known approaches turn out to be tradeoffs that sacrifice security or decentralization to achieve scalability. Actually, the blockchain scalability trilemma has been informally proposed .
After revision: Public blockchains should be able to scale with respect to the number of nodes and to the transactions workload. The blockchain scalability trilemma has been informally proposed .