Ethereum co-founder Vitalik Buterin is reminding node operators to upgrade their clients before the Bellatrix “hard fork,” slated for Sept. 6. Buterin said that the scheduled upgrade will be the final update that prepares the Beacon chain (proof-of-stake chain) for the Merge. The merge is still expected to happen around Sep 13-15. What’s happening today is the Bellatrix hard fork,…