I was curious, here's what the abstract says: > Bitcoin provides two incentives for miners: block rewards and transaction fees. The former accounts for

I was curious, here's what the abstract says: > Bitcoin provides two incentives for miners: block rewards and transaction fees. The former accounts for the vast majority of miner revenues at the beginning of the system, but it is expected to transition to the latter as the block rewards dwindle. There has been an implicit belief that whether miners are paid by block rewards or transaction fees does not affect the security of the block chain. > We show that this is not the case. Our key insight is that with only transaction fees, the variance of the block reward is very high due to the exponentially distributed block arrival time, and it becomes attractive to fork a “wealthy” block to “steal” the rewards therein. We show that this results in an equilibrium with undesirable properties for Bitcoin’s security and performance, and even non-equilibria in some circumstances.