Ethereum, the second-largest cryptocurrency by market value, just ran a final dress rehearsal ahead of a years-awaited upgrade that’s been billed as one of the most important events in the history of crypto.Since its creation almost a decade ago, ethereum has been mined through a so-called proof-of-work model. It involves complex math equations that massive numbers of machines race to solve, and it requires an abundance of energy. Bitcoin mining follows a similar process.Ethereum has been working to shift to a new model for securing the network called proof of stake. Rather than relying on energy-intensive mining, the new method requires users to leverage their existing cache of ether as a means to verify transactions and mint tokens. It uses far less power and is expected to translate into faster transactions.Ansgar Dietrichs, a researcher with the Ethereum Foundation, said in a tweet that the most relevant metric for success when it comes to a dry run like this is looking at time to finalization. He called it “another successful test.”A research associate from Galaxy Digital pointed out that the participation rate after the test merge dropped, and it looked like there may have been an issue with one of the clients — but overall, it worked.“A success Merge = chain finalizes,” Christine Kim wrote in a tweet, adding that we are likely to see similar types of issues with the upgrade on mainnet, “but the point is, the Merge worked.”cnbc.com