What is BIP100?

BIP100 replaces the static block size limit in Bitcoin Cash (BCH) and in Bitcoin (BTC) with a hard limit set by coinbase vote.

A simple deterministic system is specified, whereby a 75% mining supermajority may activate a change to the maximum block size each 2016 blocks.

Each change is limited to a 5% increase from the previous block size hard limit, or a decrease of similar magnitude.

View BIP100 - Full Specification

What does a vote look like?

Voting is done in the coinbase transaction. A BIP100 vote for 32MB looks like this: /BIP100/B32/ If there is no BIP100 vote, then a EB will be counted as a vote. So /EB32/ is also a vote for 32MB (and a promise to accept 32MB blocks). This allows both BIP100 vote and EB signal to be present, so a BIP100 miner may publish /BIP100/B32/EB16.1/ meaning that he votes for 32MB, but currently accepts block of size 16.1MB.

Media