Blockchain Industry | What exactly did Ethereum’s “Merge” merge?
The Beacon Chain launched as early as December 1, 2020, and ran alongside the original proof-of-work mainnet for nearly two years before they officially merged.
You can think of the “Merge” as changing the engine on a plane in mid-flight: account balances, contracts, and transaction history stayed the same; what changed was how blocks are produced.
After the “Merge,” newly issued $ETH was no longer awarded to miners, but instead went to validators.
If you don’t understand something, don’t put a large amount of money into it. It’s safer to try it with a small amount.

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This is just my personal perspective and may not be accurate. Please use caution.