consensus/ethash: change eip3554 from 9.5M to 9.7M (ethereum#22870)

Author: holiman

consensus/ethash/consensus.go

@@ -46,9 +46,9 @@ var (
 	allowedFutureBlockTimeSeconds = int64(15)         // Max seconds from current time allowed for blocks, before they're considered future blocks
 
 	// calcDifficultyEip3554 is the difficulty adjustment algorithm as specified by EIP 3554.
-	// It offsets the bomb a total of 9.5M blocks.
+	// It offsets the bomb a total of 9.7M blocks.
 	// Specification EIP-3554: https://eips.ethereum.org/EIPS/eip-3554
-	calcDifficultyEip3554 = makeDifficultyCalculator(big.NewInt(9500000))
+	calcDifficultyEip3554 = makeDifficultyCalculator(big.NewInt(9700000))
 
 	// calcDifficultyEip2384 is the difficulty adjustment algorithm as specified by EIP 2384.
 	// It offsets the bomb 4M blocks from Constantinople, so in total 9M blocks.