The Difference Between Bitcoin and Blockchain

Bitcoin is a network and the money that moves through it. The blockchain is only the ledger in which that network records who owns which bitcoin. Without Bitcoin, the blockchain would be a slow database. Without the blockchain, there would be no Bitcoin as we know it. One is the purpose, the other a tool.

How a blockchain works technically, with blocks, fingerprints and mining, is explained in Blockchain explained simply. This article is about something else: what is Bitcoin, what is the blockchain, and why did the attempt to sell one without the other become one of the most expensive fads of recent years?

Bitcoin is more than its blockchain

When you say "Bitcoin", you actually mean a whole system. It has three parts:

1. The money. The unit BTC, at most 21 million, divisible into 100 million satoshis. This is what you buy and hold.
2. The network. Tens of thousands of nodes that check every payment, and miners that append new blocks. Nobody owns this network, anyone may take part.
3. The rules. What a valid payment is, how many new bitcoin are created per block, how hard the mining puzzle is. Every node enforces these rules itself.

The blockchain is the record of these three parts: the list of all valid payments, in the right order, with proof of how much work stands behind them. It is important, but it is not the whole thing. Just as the land register is not the land and the accounts are not the company.

A word Satoshi did not use

One small detail shows how much the order has shifted: the word "blockchain" does not appear at all in the Bitcoin white paper of 2008. Satoshi Nakamoto writes of a "chain of blocks" and a "proof-of-work chain". The single word only caught on years later. For Satoshi, the chain was a component that made electronic cash without a bank possible. Who he was and what else he wrote is in the portrait Satoshi Nakamoto.

How the parts fit together

The parts of Bitcoin support each other. Take one away and the others fall.

• No money, no mining. Miners spend real money on machines and electricity. They do it because every new block brings them new bitcoin and the fees of the payments in it. This reward is created inside the system. Nobody has to pay it from outside.
• No mining, no security. The computing work makes it expensive to change old entries. Whoever wants to rewrite history has to compute more than all honest miners together. How that works exactly is explained in Proof of work.
• No security, no money. A ledger that someone can change at will protects no value. Nobody would save in it.

This loop is Bitcoin's actual invention. The individual building blocks existed before: Stuart Haber and W. Scott Stornetta described chains of fingerprints in 1991, and Adam Back proposed proof of work against spam with Hashcash in 1997. What was new in 2008 was that Satoshi tied them together through a scarce money into a system that pays for itself and protects itself.

This chart shows how the number of new bitcoin shrinks with every halving and approaches 21 million:

The hype: "blockchain, not Bitcoin"

From 2016, and especially between 2017 and 2019, an idea came into fashion that was repeated in many talks at the time: Bitcoin was merely an object of speculation, and the real innovation was the technology behind it. The blockchain would transform supply chains, stock exchanges, banks and public authorities, without any Bitcoin.

Banks formed consortia, IT corporations offered "blockchain as a service", and at the end of 2015 the Linux Foundation launched the Hyperledger project, on which many corporate solutions were built. The difference from Bitcoin: these blockchains were private or permissioned. Only selected companies were allowed to write entries, there was no money of their own and no mining.

What came of it: three well-documented cases

TradeLens (Maersk and IBM). The world's largest shipping company and IBM presented a blockchain platform for shipping documents in 2018. It was meant to replace the paperwork of world trade. At the end of November 2022 both announced its end, and it was switched off in early 2023. Maersk gave as the reason that the platform had not reached the necessary participation from the industry. Rival shipping lines did not want to run their data through a platform owned by a competitor.

we.trade. An alliance of large European banks built a blockchain platform for trade finance for small and medium-sized firms from 2017. In 2022 the company ceased operations because it ran out of money.

The settlement system of the Australian exchange ASX. At the end of 2017 the ASX decided to replace its settlement system CHESS with one based on a distributed ledger. After years of delays it stopped the project in November 2022 and wrote off about 250 million Australian dollars. An independent review had found fundamental problems.

Then there were cases that only show how hot the word was. In December 2017, the US beverage maker Long Island Iced Tea renamed itself Long Blockchain, and its shares closed that same day almost three times as high as the day before. No viable blockchain business ever came of it, and Nasdaq removed the shares from trading in 2018.

Why a blockchain without Bitcoin loses its point

The failed projects were not simply unlucky. They had a basic problem: they took the tool and left out the purpose.

Who trusts whom?

A blockchain with mining is an expensive and slow way to store data. That effort is only needed by someone who wants to trust nobody and has no operator. A corporate blockchain, however, has operators, and the participants know each other by name and contract. Then the only question is: whom do they trust? If the answer is "the operators", a normal database with access rights is faster, cheaper and just as secure.

The middle column has the drawbacks of the left one (effort, complexity) and the weakness of the right one (in the end, the operators decide). That is why it rarely caught on.

Without proof of work, the chain is only a promise

A chain of fingerprints shows whether someone has changed an old entry. It does not prevent it. Whoever keeps the chain can simply recompute it from the desired point. On a private blockchain that takes seconds.

Only proof of work makes rewriting expensive: every recomputed block needs as much computing work as the original. And computing work costs electricity that someone has to pay for. That is why there is no way around a money of its own.

The money has to be scarce

Having its own money is not enough. If someone can create any number of new units, the reward loses its value and the security goes with it. Bitcoin solves this with a fixed cap that every node checks for itself. Why this scarcity matters is explained in Why there are only 21 million bitcoin. Why the many other coins with their own blockchains cannot simply copy it is covered in Bitcoin vs. altcoins.

The blockchain only checks itself

One last point on which many supply chain projects failed: a blockchain can only check what is created inside it. With Bitcoin, that is everything. A payment is valid if it is signed with the right key and the bitcoin have not been spent yet. How that works is shown in How does a Bitcoin transaction work?.

A supply chain is different. Whether a container really holds 2’000 boxes of organic mangoes, the blockchain does not know. It only knows what a person or a sensor entered. If the entry is wrong, it is from then on wrong in a tamper-proof way.

When people say one and mean the other

The two words are swapped all the time. A few typical cases:

The last case matters most to you as a holder. The blockchain records amounts and addresses, public for everyone. What secures your bitcoin is your private key alone. That is why custody is always about keys and the seed phrase, never about "the blockchain".

What this means for you as a saver

For your decisions the difference has very practical consequences:

• You buy Bitcoin, not technology. The value you hold for the long term lies in the scarce money and the network that protects it. The blockchain is one component of it, just as TCP/IP is one component of the internet.
• "Blockchain" in a product name is not a mark of quality. Check whether a fund, certificate or token really holds bitcoin.
• New chains are no substitute. Every blockchain is only as secure as the computing work or the trust behind it. The Bitcoin blockchain has by far the most work behind it, since the first block on 3 January 2009.

If you are just starting out and first want to see how the system works as a whole, read the beginner's guide What is Bitcoin?.