The block-size limit debate has taken a turn now that some of Bitcoin’s biggest mining pools are publicly endorsing BIP 100 (Bitcoin Improvement Proposal 100) instead of backing a Bitcoin XT blockchain fork. So far, F2Pool, BTCChina, BitFury, KnCMiner, 21 Inc. and several smaller pools have come out in support of this alternative proposal. Combined, this represents well over half of all hashing power on the Bitcoin network.
While these endorsements are just a show of support, and do not trigger a change of the block-size limit or a blockchain hard fork as Bitcoin XT is programmed to do, the mining endorsements do mandate a closer look at BIP 100.
What is BIP 100?
Over the past weeks most of the attention regarding the block-size issue has gone to BIP 101 and the Bitcoin XT fork, but BIP 100 was really the first BIP to offer a solution for the block-size limit. Drafted and published as a PDF by Bitcoin Core developer and BitPay employee Jeff Garzik in June, BIP 100 does not set any specific block-size limit or program