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Category: Events
15 articles · Wars, splits, hash wars and launches.
Value overflow incident (2010)
The August 2010 bug that let a transaction create about 184 billion bitcoin; Satoshi shipped 0.3.10 within hours and the good chain overtook the bad one at block 74,691.
March 2013 chain fork
The accidental split of 11–12 March 2013, when Bitcoin 0.8 accepted a large block that older nodes could not process; pools downgraded to 0.7 to end it.
Block size war
The 2015–2017 fight over Bitcoin's 1 MB limit that produced the first durable chain split.
Hong Kong Roundtable
The February 2016 meeting where miners and some Core contributors agreed SegWit first, then a roughly 2 MB hard fork that never shipped.
Replay protection in the 2017 forks
How the 2017 forks did, or did not, make their transactions invalid on Bitcoin: Bitcoin Cash's SIGHASH_FORKID, its copies, and SegWit2x's late opt-in marker.
New York Agreement
The May 2017 industry deal to activate SegWit at 80% and hard fork to 2 MB within six months, which became SegWit2x.
BIP-91 (reduced-threshold SegWit signalling)
James Hilliard's 2017 miner-enforced bridge: an 80% vote over 336 blocks that made miners reject blocks not signalling SegWit, letting the original 95% deployment lock in.
UASF (BIP-148)
The 2017 user-activated soft fork that threatened to reject non-SegWit-signalling blocks from 1 August 2017.
CVE-2018-17144 (duplicate-input inflation bug)
A 2018 Bitcoin Core bug that could crash nodes and, in 0.15.x–0.16.2, let a miner inflate supply by spending one input twice in a block; patched in 0.16.3 before any known exploit.
BCH–BSV hash war
The November 2018 contest between Bitcoin ABC and Bitcoin SV over Bitcoin Cash's upgrade, which split BCH into two chains.
CTV and the covenant activation debates
The long fight over OP_CHECKTEMPLATEVERIFY (BIP-119): Jeremy Rubin's 2022 Speedy Trial plan, a 2025 open letter, and a 2026 activation meeting.
ABC vs BCHN split
The November 2020 split in which Bitcoin ABC, insisting on an 8% coinbase funding rule, left Bitcoin Cash; its chain became BCHA, later eCash.
Taproot activation (2021)
The Schnorr/Taproot soft fork, signalled through Speedy Trial in 2021, locked in at block 687,285 and activated at block 709,632 on 14 November 2021.
The 2025 OP_RETURN fight
The 2025 dispute over Bitcoin Core lifting its default OP_RETURN limit, which pushed opponents to Bitcoin Knots and fed the BIP-110 fork effort.
BIP-110 (Reduced Data Temporary Softfork)
The 2025 proposal for a one-year soft fork limiting data fields, with a 55% threshold and mandatory signalling, whose 2026 enforcement split Knots nodes from Bitcoin.