> The power is used to secure the system, not to perform transactions. This looks to be the case now, with block reward being dominated by the block subsidy. B

> The power is used to secure the system, not to perform transactions. This looks to be the case now, with block reward being dominated by the block subsidy. But by design, the latter reduces exponentially over time, so that within a few decades, the security will have to come predominantly from transaction fees.