A Guided Tour of the 2mb Fork
Increasing the block size limit from 1 million bytes to 2 million bytes sounds so simple: just change the “1” to a “2” in the source code and we’re done, right?
If we didn’t care about a smooth upgrade, then it could be that simple. Just change this line of code (in src/consensus/consensus.h):
If you make that one-byte change then recompile and run Bitcoin Core, it will work. You computer will download the blockchain and will interoperate with the other computers on the network with no issues.
If your computer is assembling transactions into blocks (you are a solo miner or a mining pool operator), then things get more complicated. I’ll walk through that complexity in the rest of this blog post, hopefully giving you a flavor for the time and care put into making sure consensus-level changes are safe.
Github has a handy...
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