Public Blockchain Examples: Bitcoin, Ethereum, and More

What Makes a Blockchain Public?

A public blockchain is open to anyone. No permission needed. You don’t have to ask a company or government to join. Anyone can download the software, send transactions, or even become a validator. All transactions are recorded on a public ledger that anyone can check. No secrets. No hidden records. This is the core idea behind Bitcoin and Ethereum - systems built to work without central control.

Bitcoin: The Original Public Blockchain

Bitcoin launched on January 3, 2009. It wasn’t designed to be a fancy platform. It was built to move money - directly, securely, and without banks. Its rules are simple: send value from one address to another. Every transaction is verified by miners using powerful computers solving complex math puzzles. That’s called proof-of-work.

Bitcoin’s network is massive. Over 15,000 full nodes spread across more than 100 countries keep the system running. These aren’t just servers. They’re independent computers verifying every block. That’s what makes Bitcoin the most decentralized public blockchain ever created.

Each block takes about 10 minutes to confirm. It handles only 4 to 7 transactions per second. That sounds slow, but it’s intentional. Speed isn’t the goal. Security is. Bitcoin’s SHA-256 hashing algorithm is so strong that it would cost over $14.5 billion to attack it, according to Crypto51.app estimates in 2023. That’s more than most countries spend on defense.

Miners earn Bitcoin as a reward. After the May 2020 halving, they got 6.25 BTC per block. The next one, in April 2024, cuts that to 3.125 BTC. This reduces supply over time, which is why many call Bitcoin “digital gold.” It’s scarce. It’s durable. And it’s not controlled by any government.

Ethereum: The Programmable Blockchain

Ethereum changed everything. Launched in July 2015, it didn’t just move money. It let people write code that runs on the blockchain. That code is called a smart contract. Think of it like a vending machine: you put in ETH, and it automatically gives you something - a token, a loan, a game item - without needing a middleman.

Ethereum uses a different system now. In September 2022, it switched from mining to staking. That’s called “The Merge.” Instead of using electricity-hungry machines, validators lock up 32 ETH (about $51,200 at $1,600 per ETH) to help secure the network. This cut energy use by 99.95%, according to the Ethereum Foundation.

Blocks now confirm every 12 seconds. Ethereum handles 15 to 30 transactions per second. It’s faster than Bitcoin. But its real power is flexibility. Developers build apps on it using Solidity, a programming language designed for blockchains. Over 4,000 decentralized apps (Dapps) run on Ethereum. DeFi platforms hold over $72 billion in locked value. NFTs have traded over $23 billion in total.

But it’s not perfect. Gas fees - the cost to send a transaction - can spike. During the 2021 bull run, fees hit $180 per transaction. In late 2023, they averaged $3.50, still higher than Bitcoin’s $1.20. That’s why most users now rely on Layer-2 solutions like Arbitrum and Optimism. These secondary networks handle transactions off the main chain, slashing costs by up to 90%.

Other Public Blockchains You Should Know

Bitcoin and Ethereum aren’t alone. Other public blockchains have emerged with different trade-offs.

• Cardano launched in 2017. It uses a proof-of-stake system called Ouroboros. It claims to be more energy-efficient and scientifically peer-reviewed. It has around 2,000 nodes and confirms blocks every 10 seconds.
• Solana went live in 2020. It boasts 65,000 transactions per second - far faster than Ethereum or Bitcoin. But it’s not as decentralized. In 2022 alone, Solana had six major outages. Its speed comes at a cost: reliability.
• Polkadot doesn’t run one blockchain. It connects many. Think of it as a highway between blockchains. It lets different chains talk to each other, sharing security and data.

Each has strengths. But none match Bitcoin’s security or Ethereum’s ecosystem. That’s why they remain the top two.

How People Use Them Differently

Users treat Bitcoin and Ethereum in totally different ways.

On Reddit’s r/Bitcoin, people talk about holding Bitcoin as long-term savings. A top post from October 2023 asked, “Just bought my first 0.01 BTC as long-term savings - am I crazy?” It got over 2,300 upvotes. That’s the mindset: store of value. Like gold.

On r/ethereum, the conversation is technical. “Best resources for learning Solidity in 2023?” got over 1,800 upvotes. People here are building apps. They’re coding. They’re experimenting.

On-chain data backs this up. Glassnode’s 2023 report showed 62.3% of Bitcoin addresses haven’t moved coins in over a year. That’s long-term holding. For Ethereum, only 41.7% are inactive. More people are using it actively - swapping tokens, staking, playing games.

DappRadar found 1.8 million daily active Ethereum wallets versus 850,000 for Bitcoin. Bitcoin is for storing. Ethereum is for doing.

Real-World Impact and Criticism

Bitcoin’s role as a store of value is clear. Over 106 million people own Bitcoin worldwide. Fifteen U.S. public companies - like MicroStrategy and Tesla - hold over $12 billion of it on their balance sheets. It’s becoming institutional.

Ethereum is the backbone of DeFi, NFTs, and Web3. JPMorgan’s Onyx platform processes 300% more Ethereum-based transactions each year. It’s not just for crypto traders. Banks, insurers, and logistics firms are testing it.

But critics are loud. Nouriel Roubini called both “highly speculative assets.” Paul Krugman said blockchain “solves a problem that doesn’t exist.” And yes - scams exist. Hacks happen. Volatility is real.

Still, the numbers don’t lie. Bitcoin and Ethereum aren’t going away. They’re evolving. Bitcoin’s Taproot Assets upgrade in early 2024 will let users issue tokens on its network. Ethereum’s Dencun upgrade will make Layer-2 transactions cheaper than ever.

Which One Fits Your Needs?

If you want to hold something secure, simple, and scarce - Bitcoin is the choice. It’s the most battle-tested network in crypto history.

If you want to interact with apps, earn interest on crypto, buy NFTs, or build your own decentralized tool - Ethereum is where you start.

Neither is perfect. Bitcoin is slow. Ethereum is complex. But together, they cover the two biggest uses of public blockchains: value storage and programmable trust.

Other chains may offer speed or innovation. But none have the combination of adoption, security, and community that Bitcoin and Ethereum have built over more than a decade.