Ori Brafman and Rod Beckstrom developed a metaphor to explain the power of the kind of open-source collaboration and decentralized decision-making that defines bitcoin. If you cut off a spider's leg, it is crippled, and if you cut off its head, it dies, the authors tell us. But if you cut of a starfish's leg, it grows a new one, and the dislodged leg can grow into an entirely new starfish. As fit a head or brain, it has none. Similarly, a decentralized organization has no central point of vulnerability and it thus virtually impossible to shut down or destroy.