ProtocolMajor
CoinWallet Spam Attack
Deliberate transaction flood clogs the mempool to push for bigger blocks.
#spam#block-size
Forks & Chain Splits
The block size war and its aftermath
From 2015 through 2018, Bitcoin's community fought over block size, SegWit, and who controls the protocol. The UASF movement forced miner capitulation; big-blockers forked to Bitcoin Cash; further splits produced Bitcoin Gold and Bitcoin SV. Bitcoin (BTC) emerged as the dominant chain.
Chains
Bitcoin
BTCThe original chain — SegWit, 1 MB base block weight, UASF victory.
1 MB base (≈2–4 MB effective with SegWit)·SHA-256 (ASIC)
Bitcoin Cash
BCHAugust 1, 2017Forked August 1, 2017 to raise the block size limit to 8 MB. Born from the big-blocker camp.
8 MB (later 32 MB)·SHA-256 (ASIC)
Bitcoin Gold
BTGOctober 24, 2017October 2017 fork changing the mining algorithm to resist ASICs. Failed to gain lasting adoption.
1 MB·Equihash (GPU-targeted)
Bitcoin SV
BSVNovember 15, 2018November 2018 split from Bitcoin Cash — pushed for massive blocks and Craig Wright's 'Satoshi Vision'.
128 MB+ (roadmap: GB-scale)·SHA-256 (ASIC)
Key Blocks
From the 2015 spam attack through SegWit activation — the blocks that defined the war.