The Bitcoin Genesis Block: The First Block and Its Hidden Message

Key takeaways

• The genesis block is the first block of Bitcoin’s chain, called block 0. Its timestamp is 3 January 2009 and it was created by Satoshi Nakamoto.
• Its only transaction contains a line of text that quotes a newspaper headline of that day. The text shows the date, and many people read it as a comment on banking, but its creator never explained the intent.
• The 50 bitcoin reward in this block is commonly described as unspendable.
• The block is built into every node’s software and every later block links back to it, which makes it the anchor of the whole chain.
• The first payment between two people came days later, in block 170 on 12 January 2009.

What is the Bitcoin genesis block?

The genesis block is the first block of the Bitcoin blockchain, numbered block 0. Its timestamp is 3 January 2009, and it was created by Satoshi Nakamoto about two months after the whitepaper was published on 31 October 2008. Every later block was added on top of it.

It looks like any other block with one exception. A normal block points to the block before it by including that block’s hash, and the genesis block has nothing to point to, so that field holds only zeros. It also contains a single transaction, the reward that a block’s creator is allowed to claim, which in 2009 was 50 bitcoin. What Is a Blockchain? explains how blocks link together.

The main facts in one place:

Fact	Detail
Block number	0, also called block zero
Date	3 January 2009
Created by	Satoshi Nakamoto (a pseudonym)
Transactions	One: the 50 bitcoin block reward
Previous block	None, so the field is all zeros
Text in the first transaction	A newspaper headline dated 3 January 2009
Where it is stored	On every full node, and built into the software

What is the hidden message in the genesis block?

The message is a line of text in the genesis block’s only transaction that reads “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks”. It is a headline from The Times, a British newspaper, and the Chancellor is the UK’s finance minister.

It is hidden only in the sense that no wallet or app shows it. The text sits in plain view in the public record. The first transaction in any block has a field that can hold arbitrary data, and the creator of the genesis block used it for this line.

Two things can be said safely about it. The headline carries a date, which ties the text to 3 January 2009. And because its subject is a government weighing a second rescue of banks, many people read it as a comment on the financial system of the time, which fits the 2008 crisis described in The History of Bitcoin.

What cannot be said is why Nakamoto chose it. The creator never explained, so any claim about intent is interpretation. Who Is Satoshi Nakamoto? covers what is and is not known about the person behind the name.

Can the 50 bitcoin in the genesis block be spent?

No, the reward in the genesis block is commonly described as unspendable. The usual explanation is technical: the block is written directly into Bitcoin’s software instead of being processed like a normal block, so its output was never recorded as a coin that can be spent, and a transaction trying to spend it would be rejected.

That makes it a small exception to how every other block reward works. Those 50 bitcoin still count in the supply schedule, which is one reason circulating supply figures differ between sources, as How Many Bitcoin Are Left to Mine? explains.

Do not confuse this block with the coins created in the first months after launch. Those sit in later blocks, and the open questions about who holds them belong to the Satoshi article, not this one.

Why is the genesis block called block 0?

Blocks are numbered by how many blocks come before them. Nothing comes before the genesis block, so it is block 0, the next block is block 1, and the count continues from there. This number is called the block height.

The numbering matters in practice because Bitcoin’s rules refer to block heights. The block reward is cut in half every 210,000 blocks, counted from block 0, as What Is the Bitcoin Halving? explains.

Why does the genesis block matter?

The genesis block matters because it is the anchor of the chain: every later block links back to it. Each block contains the hash of the block before it. Follow those links backward from today’s newest block and you arrive at block 0 without a gap on the way.

That is also what makes the history hard to rewrite. Changing anything in an old block changes its hash and breaks every link after it, so the identity of the first block fixes the identity of everything built on top of it.

Every computer running Bitcoin software already knows this block, because it is part of the program. A new node starts from it and then downloads and checks each later block in turn, as What Is a Bitcoin Node? describes. A chain that does not start from this block is not Bitcoin’s chain. Chains that split off later share Bitcoin’s history up to the split, while an independent cryptocurrency starts from a genesis block of its own.

The block also shows proof of work from the first moment. Its hash begins with a long run of zeros, the visible sign that the creator did the computing work the rules require, as How Does Bitcoin Work? explains.

What happened right after the genesis block?

The first version of the Bitcoin software was released in early January 2009, and the next block followed several days after the genesis block. The first transaction between two people took place on 12 January 2009 in block 170, when Nakamoto sent bitcoin to the developer Hal Finney.

In those first weeks the network was tiny and the coins had no market price. The first documented purchase of a physical good with bitcoin came in May 2010, a story told in Bitcoin Pizza Day.

How can you look at the genesis block yourself?

You can look at it with a block explorer, a website that lets anyone search the public chain by block height, block hash, transaction or address. Enter 0 as the block height and you will see the block, its single transaction and the embedded text. Some explorers show the text as readable words, and others show it as raw hexadecimal data, which any hex decoder can turn into text.

If you run your own node, its software can also show block 0 from your own copy of the chain, with no third party involved. Explorers only need public information such as a block number or an address, so never type a seed phrase or private key into one. Anyone who asks you to is attempting theft, and Common Bitcoin Scams and How to Spot Them lists the usual tricks.

What does the genesis block not tell us?

It does not tell us who Nakamoto is, why the headline was chosen, or how many coins Nakamoto holds. It records a starting point and nothing more, and it says nothing about what bitcoin is or will be worth.

For decisions about your own money, a qualified professional is the right person to ask, not the history of a block. If you are new to the subject, the Start Here path gives an ordered route through the basics.

Where to go next

• The History of Bitcoin: From a Whitepaper to a Global Network: the timeline that begins with this block.
• Who Is Satoshi Nakamoto? What We Know and What We Don’t: the creator behind the first block.
• The Bitcoin Whitepaper Explained, Section by Section: the design the block put into practice.
• What Is a Blockchain? Bitcoin’s Ledger Explained: how blocks link back to the first one.