> But on testnet4 every block yields 50 tBTC. So several people try to mine 
such a block, leading to the many parallel forks.

What about lowering the coinbase block reward (with fees), if the 
difficulty was resetted? For example: if the real difficulty is equal to 
1,000,000, and some CPU miner got 50.01 tBTC, then that miner could simply 
receive 5,001 satoshis instead. And the rest of the block reward can be 
just timelocked to the future block number, or simply burned (which is 
easier to implement).

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