The state-of-the-art for digital security is quantum-mechanical, not relativistic as the article itself says "... Gilles Brassard of the University of Montreal, who was not involved in the research, points out in an accompanying “News and views” article in Nature that fraudsters might in future try and breach security by using quantum entanglement . . ." Cryptoanarchy deserves the finest - not some second-hand, second-rate solution. And ' Quantum supremacy ' is already being brayed by the usual suspects.