Bitcoin Cash (BCH) emerged as one of the most significant hard fork events in cryptocurrency history, driven by a fundamental disagreement over how best to scale Bitcoin. Since its inception in 2017, BCH has undergone several critical upgrades through hard forks—each shaping its development path, community alignment, and technological capabilities. This article explores the three major hard fork upgrades in BCH's history, their technical motivations, real-world impacts, and lasting implications for the blockchain ecosystem.
The Birth of Bitcoin Cash: August 1, 2017
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On August 1, 2017, at Bitcoin block height 478,558, Bitcoin Cash was born via a hard fork from the original Bitcoin (BTC) chain. The primary motivation behind this split was to address growing concerns about network congestion and high transaction fees on the Bitcoin network.
Unlike BTC’s approach of implementing Segregated Witness (SegWit) and layer-2 solutions like the Lightning Network, BCH proponents advocated for on-chain scaling—increasing block sizes to allow more transactions per block. As part of the fork, BCH removed SegWit and set an initial block size limit of 8MB, later increased further in subsequent upgrades.
This bold move sparked widespread debate across the crypto community. While critics argued it compromised decentralization, supporters believed it restored Bitcoin’s original vision as a peer-to-peer electronic cash system. In the months that followed, BCH gained rapid adoption and even reached the position of second-largest cryptocurrency by market capitalization during the 2017–2018 bull run.
First Upgrade: November 2017 — Fixing the Emergency Difficulty Adjustment (EDA)
One of the earliest challenges BCH faced after launch was block time instability due to fluctuating mining difficulty. To ensure consistent block production despite variable hash rate, developers introduced the Emergency Difficulty Adjustment (EDA) mechanism.
The EDA rule stated:
- If the median time past (MTP) of the current block and the 6th previous block differed by more than 12 hours, the mining difficulty would automatically decrease by 20%.
- This adjustment aimed to prevent long delays in block confirmation when miners temporarily shifted hash power away from BCH.
While EDA successfully stabilized block times during low-hash-rate periods, it had unintended consequences. Mining pools quickly exploited this mechanism through hash rate flipping, rapidly switching computational power between BTC and BCH to mine BCH blocks at reduced difficulty and maximize profits.
This behavior led to:
- Erratic block intervals on both chains
- Temporary congestion on the Bitcoin network
- A faster-than-expected emission schedule for BCH, meaning BCH would halve before BTC
In response, developers revised the algorithm during a November 2017 upgrade. The updated difficulty adjustment used a more responsive moving average model—smoothing out fluctuations while preventing abuse. This fix restored stability and marked BCH’s first major protocol refinement.
Second Upgrade: May 2018 — Expanding Capacity and Script Functionality
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The May 2018 hard fork represented a major leap forward in BCH’s technical roadmap. Key changes included:
- Block size increase to 32MB – enabling significantly higher transaction throughput
Reactivation of disabled Bitcoin script opcodes, including:
OP_CAT,OP_AND,OP_OR,OP_XOROP_DIV,OP_MODOP_SPLIT,OP_NUM2BIN,OP_BIN2NUM
- Expansion of OP_RETURN data capacity to 220 bytes – allowing richer metadata embedding
These enhancements transformed BCH from a simple payment-focused chain into a platform capable of supporting smart contracts and token systems. Soon after the upgrade, developers launched several token protocols on top of BCH, including:
- SLP (Simple Ledger Protocol) – enabling creation of custom tokens and NFTs
- Wormhole Protocol – a more advanced framework for issuing assets and executing smart contracts
- Keoken – another tokenization solution built for enterprise use cases
This upgrade demonstrated BCH’s commitment to becoming not just digital cash, but a full-fledged programmable blockchain, albeit with a focus on simplicity and efficiency over Turing-complete complexity.
Third Upgrade: November 2018 — The Great Split and Rise of BSV
The most controversial upgrade occurred on November 15, 2018, when ideological differences within the BCH community culminated in a dramatic split.
At the heart of the conflict was Dr. Craig S. Wright (CSW), who led the Bitcoin SV (Satoshi Vision) faction. He advocated for:
- Scaling BCH to 128MB blocks
- Restoring original Bitcoin protocol rules as he interpreted them
- Rejecting certain post-fork innovations like SLP
Opposing CSW was a coalition including Bitcoin.com, Bitmain, and other core developers who supported continued innovation under the BCH brand with moderate scaling.
Just hours before the scheduled fork, tensions peaked when CSW’s SV faction briefly controlled over 75% of BCH’s hash rate. However, at the last moment, Bitcoin.com deployed massive hidden mining power (~4 exahash) in support of the anti-SV chain—effectively altering the outcome.
The result? A permanent split:
- BCHABC (later renamed BCH) continued under the original ticker with support for tokens and flexible upgrades
- Bitcoin SV (BSV) broke off as a separate chain pursuing ultra-large blocks and strict protocol conservatism
This event wasn’t just a technical divergence—it reflected deeper philosophical divides about decentralization, governance, and what “Bitcoin” should become.
Frequently Asked Questions (FAQ)
Q: What is a hard fork in blockchain?
A: A hard fork is a permanent divergence from a blockchain’s previous version. Nodes running the new software reject old transactions or blocks, creating two separate chains if consensus isn’t reached.
Q: Why did Bitcoin Cash split from Bitcoin?
A: Due to disagreements over scalability. BTC chose off-chain scaling via SegWit and Lightning; BCH opted for larger blocks to increase on-chain capacity directly.
Q: Did BCH succeed in lowering fees?
A: Yes. Even during peak usage, BCH has maintained average transaction fees below $0.01—making it highly competitive for micropayments and daily transactions.
Q: Is Bitcoin Cash still active today?
A: Absolutely. Despite competition from other layer-1 chains, BCH remains among the top cryptocurrencies by network activity and developer engagement.
Q: What happened to BSV after the split?
A: BSV continues as an independent blockchain with its own ecosystem, though it has faced regulatory scrutiny and controversy surrounding its primary backers.
Q: Can I send BCH to a BTC address?
A: No. Although they share similar address formats, sending BCH to a BTC-only wallet may result in permanent loss unless the service supports both chains.
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By examining these pivotal moments—from its birth in 2017 to the dramatic schism of 2018—we gain valuable insight into how technical decisions, economic incentives, and human conflict shape blockchain ecosystems. Whether you view BCH as a necessary evolution or a cautionary tale, its impact on crypto history is undeniable.