Paying per computational step could mitigate distributed denial of service attacks (DDoS) and abusive spam when launched against a large number of targets at a near zero margin cost. The potential benefits of this pay-per-computation model for the mitigation of network abuse cannot be understated.

The bitcoin lightning network is an off-chain payment channel that provides instant, high-volume micropayments while removing risk of trusted third parties. Recently, we had the chance to ask one of the inventors, Joseph Poon, a few questions surrounding this new technology and how they are planning to use the lightning network to benefit bitcoin users.

What 21 has here is a small step for bitcoin mining, but a giant leap for the internet of things.