Ethereum, the second-largest cryptocurrency, has switched to proof-of-stake, cutting its energy demands. The transition, which has been in the works since 2016, won’t change much for the average Ethereum user, but it sidelines miners.

The switchover began on September 6th, when the Bellatrix upgrade was activated. It is now complete after the mining of the Terminal Total Difficulty block, which triggered the Paris upgrade. The technical part is done; now, we get to see what happens.

Before the Merge, Ethereum ran on proof-of-work, where computers all around the world competed to solve puzzles so they could add a new block to the chain. That was pretty energy-inefficient because all these miners were competing to solve the puzzle at the same time, but only one could win; all other energy was wasted. Proof of stake, on the other hand, has validators who’ve put up their Ethereum as collateral. If they misbehave, they’ll lose the Ethereum they staked.