Bitcoin and Its Forks Explained: From BTC to Bitcoin Cash, Litecoin, and Beyond

What This Sector Covers

This sector is the original cohort of crypto: Bitcoin and the chains that descend from it. That descent comes in two flavors, and the distinction matters.

A fork can be a chain split. The network disagrees on a rule change, the chain diverges, and both sides keep running with a shared history up to the split point. Bitcoin Cash is the cleanest example: it forked from Bitcoin in 2017 over the block-size debate and carried Bitcoin's transaction history forward into a separate coin. The same mechanism created Ethereum Classic, though from Ethereum rather than Bitcoin.

A fork can also mean a code fork: a brand-new chain built by copying and modifying Bitcoin's software, with its own fresh ledger from block zero. Litecoin is the canonical case. It launched in 2011 as a lighter, faster Bitcoin using a different mining algorithm, sharing none of Bitcoin's history but most of its design. Dogecoin, in turn, was forked from Litecoin's code, which is why the two are merge-mined together to this day.

So the sector is really a family tree. Bitcoin sits at the root. Some coins broke off its trunk, others grew from cuttings of its code, and one or two are cousins from the wider Proof of Work line.

The Anchor: Bitcoin

Every coin in this sector is defined by how it differs from Bitcoin, so the anchor comes first. Bitcoin launched in January 2009 with a design that has barely changed at the monetary level: a hard cap of 21 million coins, SHA-256 Proof of Work, roughly ten-minute blocks, and a reward that halves every four years.

That halving is the heartbeat of the whole sector. The Bitcoin halving cuts new issuance in half on a fixed schedule, enforcing programmed scarcity, and most coins in this cohort inherited some version of the same idea. Bitcoin's pitch is to be the hardest, most credibly neutral money in crypto, secured by the largest Proof of Work network in existence. The forks each argue they do one part of that job better: cheaper payments, faster blocks, larger blocks, or a stricter "code is law" philosophy.

The Forks Compared

The family splits cleanly on supply, speed, and purpose.

Read across the rows and the design philosophies separate. Bitcoin Cash kept Bitcoin's exact monetary policy but raised the block size to push cheaper, higher-volume payments. Litecoin quadrupled the supply and the speed, positioning itself as "silver to Bitcoin's gold." Dogecoin abandoned the supply cap entirely, trading hard scarcity for steady, predictable issuance, which is part of why it now trades more like one of the meme coins than a sound-money fork. Ethereum Classic is the outlier: it descends from Ethereum, not Bitcoin, but belongs in this Proof of Work cohort because it kept PoW when Ethereum left it, holding to the "code is law" principle that drove its 2016 split. Each brief carries the full history and the specific tradeoffs.

How the Sector Behaves

This cohort shares a market personality that flows from its shared DNA. These are Proof of Work coins with fixed or predictable supply, so they trade on a sound-money narrative more than a utility one. When that narrative is in favor, Bitcoin leads and the forks tend to follow with higher beta.

The structural risk also rhymes across the sector. Proof of Work chains are only as secure as their hash rate, and the smaller members of this family carry real attack risk that Bitcoin does not. Ethereum Classic suffered multiple 51% attacks because its hash rate was a fraction of the network it split from. That is the central lesson of the fork sector: copying Bitcoin's design does not copy Bitcoin's security. Security comes from the size and decentralization of the actual network, which is why the Proof of Work mechanics matter as much as the marketing.

Bitcoin and its forks are the foundation the rest of the sector map is built on top of. Understand this family and the rest of crypto reads as a series of answers to the questions Bitcoin raised first.