Added context to how the block max limit can be changed

[JacobSharples]

Added two sentences on how the block gas limit can be changed by consensus

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[wackerow]

Hey @JacobSharples, guess I wasn't familiar with this exact detail... do you have a reference for this by chance?

[corwintines]

I've been trying to find information on this. But, I haven't seen this in EIP-1559.

I know that block size can go up to 30 million gas, but that is the limit and there isn't an in protocol way to increase this. Do you have a source this information so I can better understand this change @JacobSharples

[JacobSharples]

Apologies for not attaching more information before. I used the EIP-1559 as a reference

after seeing some blocks with a gas limit > 30M. I started digging into this after I saw the website PumpTheGas and learned that stakers could change their max limit with a flag. However, to ensure that all nodes can execute all transactions, the change in the gas limit is capped (this is my understanding, there definitely seems to be a lack of info on this topic).

The gas limit change is restricted on how or low it change in a single block:

For example, block 20170216 has a max limit 30,029,295 (the parent and child block is 30M).

Doing the math, the max gas increase from a parent block of 30M is 30,000,000//1024 = 29,295

[wackerow]

Very cool, thanks for this @JacobSharples!

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[wackerow]

@all-contributors please add @JacobSharples for content

[allcontributors]

@wackerow

I've put up a pull request to add @JacobSharples! 🎉