by AK Arora 
On August 1, 2017, at exactly 12:20 PM UTC, Bitcoin split into two.
Not metaphorically. Literally. One blockchain became two separate, independent blockchains — each with its own rules, its own miners, its own future.
Bitcoin remained Bitcoin. The new chain became Bitcoin Cash.
Every person who held Bitcoin at that exact moment suddenly held both — Bitcoin AND Bitcoin Cash. Overnight, without doing anything, Bitcoin holders received a free allocation of an entirely new cryptocurrency.
That is what a fork does. And understanding forks helps you understand how blockchains actually evolve, upgrade, and sometimes divide.
What is a Fork in Crypto?
A fork in cryptocurrency is a change to the blockchain’s protocol — its rules — that creates a divergence in the blockchain’s history.
The word comes from software development: when a codebase splits into two separate development paths, it “forks” — like a fork in a road.
In blockchain, forks happen when:
- Developers want to upgrade the network
- The community disagrees about which direction to take
- A security vulnerability needs emergency patching
- New features need to be added
The result: either a smooth upgrade where everyone continues on one chain (soft fork) or a permanent split into two separate blockchains (hard fork).
Hard Fork vs Soft Fork — The Key Difference
| Feature | Hard Fork | Soft Fork |
|---|---|---|
| Backward compatible? | ❌ No | ✅ Yes |
| Result | Two separate blockchains | One updated blockchain |
| Node upgrade | All nodes must upgrade | Only majority needed |
| Old nodes | Rejected — cannot participate | Still work |
| Creates new coin? | Usually yes | No |
| Community split | Often | Rarely |
| Example | Bitcoin Cash (2017) | SegWit (2017) |
What is a Hard Fork?
A hard fork is a permanent, backward-incompatible change to a blockchain’s rules.
“Backward incompatible” means nodes running the old software can no longer validate blocks created by nodes running the new software. The two versions are fundamentally incompatible — they must split.
What happens during a hard fork:
Original Blockchain:
Block 1 → Block 2 → Block 3 → Fork Point
↓ ↓
New Chain Old Chain
(new rules) (old rules)
After the fork point, two completely separate chains exist simultaneously. Each has its own transaction history from the fork point onwards. Before the fork point, both chains share identical history.
Result for holders: If you held 1 Bitcoin before a hard fork, you now hold:
- 1 Bitcoin (original chain)
- 1 of the new coin (forked chain)
This is why hard forks can be exciting for existing holders — they essentially receive free coins.
What is a Soft Fork?
A soft fork is a backward-compatible upgrade to a blockchain’s rules.
“Backward compatible” means old nodes can still participate in the network — they may not fully understand the new rules, but they can still validate transactions that follow the new rules.
Why soft forks are less dramatic:
- No chain split — everyone stays on one blockchain
- No new coin created
- Smoother upgrade process
- Old nodes gradually phase out naturally
Famous soft fork example — SegWit (2017): SegWit (Segregated Witness) was a Bitcoin soft fork that changed how transaction data is stored — reducing transaction sizes and increasing effective block capacity. It was activated in August 2017 and remains active in Bitcoin today. Old nodes continued working, new nodes adopted SegWit.
Famous Hard Forks in Crypto History
Bitcoin Cash — August 2017
The most famous hard fork in crypto history — and the one that started the “fork wars.”
What happened: A group of Bitcoin developers and miners believed Bitcoin’s 1MB block size was too small — causing slow transactions and high fees. They wanted larger blocks to accommodate more transactions.
Bitcoin Core developers disagreed — arguing for off-chain scaling solutions.
Unable to reach consensus, the “big blockers” forked Bitcoin. At block 478,558, the chain split:
- Bitcoin (BTC): Continued with 1MB blocks + SegWit
- Bitcoin Cash (BCH): Launched with 8MB blocks
Roger Ver — Bitcoin Jesus — was BCH’s most prominent advocate.
Everyone holding Bitcoin at the split received an equal amount of Bitcoin Cash.
Read more: Roger Ver Net Worth
Ethereum Classic — July 2016
Ethereum’s famous fork came before Bitcoin Cash — and for a very different reason.
In 2016, a hacker exploited a vulnerability in “The DAO” — a major Ethereum smart contract — and drained $60 million worth of ETH.
The Ethereum community faced a choice:
- Option 1: Roll back the blockchain to recover the stolen funds (intervention)
- Option 2: Let the hack stand — “code is law”
The majority voted for a rollback. The chain was forked to recover the funds:
- Ethereum (ETH): The rolled-back chain — what everyone uses today
- Ethereum Classic (ETC): The original chain — where the hack’s results stood
The philosophical divide: should blockchains be immutable no matter what, or can communities intervene in extraordinary circumstances?
Bitcoin Gold — October 2017
A smaller fork designed to make Bitcoin mining more accessible by changing the mining algorithm — preventing large ASIC mining farms from dominating. Less successful than Bitcoin Cash.
The Merge — September 2022 (Ethereum)
The most technically complex upgrade in blockchain history. Ethereum switched from Proof of Work to Proof of Stake — a fundamental change to its consensus mechanism.
This was technically a hard fork — but with broad community consensus, so no chain split occurred. Everyone upgraded together.
Why Do Forks Happen?
Forks occur for several reasons:
1. Protocol Upgrades
Blockchains need upgrades like any software. Adding new features, improving security, or fixing bugs often requires changing the protocol.
2. Community Disagreements
When the community cannot agree on how to upgrade — some go one way, others go another. This is how Bitcoin Cash, Ethereum Classic, and dozens of smaller forks emerged.
3. Emergency Patches
Security vulnerabilities sometimes require immediate protocol changes. The Ethereum DAO hack required emergency intervention.
4. Philosophical Differences
Deeper disagreements about what a blockchain should be — centralized vs decentralized, big blocks vs small blocks, intervention vs immutability — have driven major forks.
Forks and Crypto Prices — What to Expect
Forks often cause significant price volatility:
Before a fork:
- Speculation drives prices up as investors buy to receive forked coins
- Uncertainty can also cause selling pressure
- Mining hash rate may shift as miners position for the fork
After a hard fork:
- Original coin price may drop as some holders sell
- New coin typically launches with significant volatility
- Long-term value of both chains depends on adoption and development
The pattern: Bitcoin Cash launched at significant value in 2017 as Bitcoin holders received free BCH. Most subsequent Bitcoin forks (Bitcoin Gold, Bitcoin Diamond, etc.) launched and quickly lost most of their value as adoption never materialized.
Are Forked Coins Taxable in India?
For Indian crypto investors — yes.
When you receive coins from a hard fork, the Indian tax treatment is:
- Received forked coins → Taxable as income at fair market value on receipt date
- Selling forked coins later → 30% tax on gains above cost basis
Example:
You hold 1 BTC before a fork
Fork happens → You receive 1 BCH worth ₹10,000
Tax at receipt: Income tax on ₹10,000 (at your slab rate)
If you sell BCH for ₹15,000 later:
Additional tax: 30% on ₹5,000 gain = ₹1,500
Complete tax guide: Crypto Tax India
How to Claim Forked Coins
If a major fork happens and you held coins on an exchange — the exchange typically credits the forked coins to your account automatically.
If you held coins in a personal wallet (Ledger, Trezor, MetaMask) at the time of the fork:
- Check if the forked chain is compatible with your wallet
- Download compatible wallet software
- Import your private key or seed phrase into the new wallet
- Claim your forked coins
Important: Only import seed phrases into official, verified wallet software. Fork events are commonly used by scammers to create fake wallets that steal your keys.
FAQs — What is a Fork in Crypto?
What is a fork in cryptocurrency?
A fork is a change to a blockchain’s protocol that creates a divergence. Soft forks are backward-compatible upgrades that keep everyone on one chain. Hard forks are incompatible changes that can split the blockchain into two separate chains.
What is the difference between a hard fork and soft fork?
A hard fork is a permanent, incompatible split — creating two separate blockchains and usually a new coin. A soft fork is a backward-compatible upgrade — everyone stays on one chain, no new coin is created.
What was the Bitcoin Cash fork?
On August 1, 2017, Bitcoin split into two chains over a disagreement about block size. Bitcoin kept 1MB blocks. Bitcoin Cash (BCH) launched with 8MB blocks. Every Bitcoin holder received an equal amount of BCH at the fork point.
Do I get free coins from a fork?
If you held the original cryptocurrency in a personal wallet at the time of the fork, you typically receive an equal amount of the new forked coin. Exchange users may or may not receive forked coins — depends on the exchange’s policy.
Are forked coins taxable in India?
Yes — in India, forked coins received are taxable as income at fair market value when received. Subsequent gains when selling are subject to 30% flat tax.
What is Ethereum Classic?
Ethereum Classic (ETC) is the original Ethereum blockchain that continued after the majority of the community forked to create Ethereum (ETH) — rolling back the 2016 DAO hack. ETC holders believe in “code is law” immutability.
Can a fork make crypto more valuable?
Forks can temporarily increase holder value if they receive valuable forked coins. Long-term, forks that lack adoption or development often fail — their coins losing most value quickly.
Conclusion
Forks are how blockchains evolve — and sometimes how communities split.
Bitcoin Cash showed that fundamental disagreements about a blockchain’s direction can produce lasting chains with real communities. Ethereum Classic showed that philosophical differences about immutability can be as divisive as technical ones.
The Ethereum Merge showed that with sufficient consensus, even the most radical protocol change — switching the entire consensus mechanism — can happen without a chain split.
Every major blockchain has forked. Most will fork again. Understanding forks helps you understand not just the technology but the governance — who gets to decide how these decentralized networks evolve, and what happens when they disagree.
Disclaimer: This article is for educational purposes only. Forked coin values are highly speculative. Tax treatment of forked coins in India should be confirmed with a qualified CA.
