50 Fun Facts About Bitcoin

Under what pseudonym was the Bitcoin white paper published in 2008?

The paper, 'Bitcoin: A Peer-to-Peer Electronic Cash System', was posted to a cryptography mailing list on 31 October 2008 and was initially ignored by academics.

On what date was the Bitcoin genesis block mined?

The block carried a reward of 50 bitcoins and a hidden message quoting that day's Times headline.

Which newspaper's headline is embedded in the Bitcoin genesis block?

The text reads 'Chancellor on brink of second bailout for banks', dating the block and hinting at Nakamoto's motives.

Who received the first bitcoin transaction, ten coins from Nakamoto in January 2009?

Finney had built the first reusable-proof-of-work currency in 2004 and was the first person besides Nakamoto to run the software.

In the first known commercial bitcoin purchase (May 2010), what did Laszlo Hanyecz buy for 10,000 BTC?

The date is now celebrated every year as Bitcoin Pizza Day.

What is the maximum number of bitcoins that will ever be issued?

The last coin is expected around the year 2140, after which miners will earn only transaction fees.

How often does the bitcoin block reward halve?

At ten minutes per block that works out to roughly every four years; the genesis-era reward was 50 bitcoins.

On average, how often is a new bitcoin block created?

The difficulty target is recalibrated every 2,016 blocks, about two weeks, to keep that pace as mining power changes.

What is the smallest unit of bitcoin called?

It is one hundred-millionth of a bitcoin; a millibitcoin is 100,000 of them.

To how many decimal places is one bitcoin divisible?

That is why the smallest unit, the satoshi, is 0.00000001 BTC.

Which hashing algorithm does Bitcoin use to chain its blocks?

Each block header is hashed twice, and each block includes the hash of the one before it.

What is the consensus process by which miners compete to add blocks called?

Miners hunt for a nonce that makes the block hash fall below a difficulty target, which is easy to verify but hard to find.

What is the special transaction called that pays a miner the block reward?

Every bitcoin in existence was created through one of these; the exchange company later took the name.

What block size limit did Nakamoto impose, which later fuelled the scaling wars?

Supporters of bigger blocks forked off in 2017 to create Bitcoin Cash after the SegWit upgrade went through.

Which 2017 upgrade aimed to support second-layer payment channels and improve scalability?

Taproot followed in November 2021, adding Schnorr signatures; ordinals (NFTs on bitcoin) arrived in 2023.

Which coin, forked off in August 2017 by supporters of bigger blocks, is the best-known hard fork?

It is one of many forks; Bitcoin Unlimited is a fork of the Bitcoin Core client software.

Roughly how many bitcoins do blockchain analysts estimate Nakamoto mined before disappearing in 2010?

He handed the alert key and code repository to Gavin Andresen, later lead developer at the Bitcoin Foundation.

On his P2P Foundation profile, Nakamoto claimed to be a man of what age living in Japan?

He gave his birthday as 5 April 1975, which some read as a nod to the US gold-ownership ban of 1933 and its 1975 repeal.

Which magazine wrongly identified a Japanese-American man in California, whose real name matched the pseudonym, as Bitcoin's creator in 2014?

Journalist Leah McGrath Goodman's story prompted the real Nakamoto's account to post 'I am not Dorian Nakamoto'.

Which Australian academic, who claimed to be Nakamoto, was ruled by a London judge in 2024 not to be him?

Wired had first floated his name in December 2015 as either the inventor or 'a brilliant hoaxer'.

Which reclusive 'bit gold' creator did the New York Times call the most convincing Nakamoto candidate in 2015?

Wei Dai's b-money and Szabo's bit gold were the first proposals for distributed digital scarcity, both in 1998.

Which 1997 Adam Back anti-spam scheme became a direct precursor of bitcoin mining?

David Chaum's ecash of the 1980s needed central control, and Hashcash had no defence against double-spending.

Which dark-web market, launched in 2011, accepted only bitcoin and became its first major use?

It transacted 9.9 million bitcoins in 30 months; founder Ross Ulbricht ran it as 'Dread Pirate Roberts'.

What sentence did Ross Ulbricht receive in 2015 for running the dark-web market he founded?

He was pardoned by President Trump in 2025.

Mt. Gox, which collapsed in 2014, was originally set up to trade cards from which game?

The name is short for 'Magic: The Gathering Online eXchange'; Jed McCaleb sold it to Mark Karpeles in 2011.

What share of global bitcoin trades did Mt. Gox handle in early 2014, just before it collapsed?

A leaked crisis document said 744,408 bitcoins had been stolen in a theft that went undetected for years.

Which country made bitcoin legal tender in September 2021, then reversed the obligation in 2025 for the IMF?

President Nayib Bukele's Bitcoin Law passed on 8 June 2021; by 2022, 80% of Salvadoran businesses still refused to accept it.

Which other country adopted bitcoin as legal tender in April 2022, only to repeal it a year later?

It ran alongside the CFA franc; Iran, meanwhile, makes its miners sell coins to the central bank to fund imports.

In which month and year did bitcoin's market capitalisation first reach $1 trillion?

The first US spot bitcoin ETFs did not start trading until January 2024.

In which month did the bitcoin price first hit $100,000?

It coincided with president-elect Trump promising to make the US the 'crypto capital of the planet'.

How many US spot bitcoin ETFs began trading in January 2024?

The first bitcoin futures ETF, ProShares' BITO, had been approved back in October 2021.

Which market launched the first bitcoin futures contracts in December 2017?

The price then crashed in early 2018 after China imposed a complete ban on bitcoin trading.

Which company put $250 million of its treasury into bitcoin in 2020, kicking off corporate adoption?

Square added $50 million and insurer MassMutual $100 million the same year, and PayPal added bitcoin support that November.

What slang term for holding bitcoin rather than selling was coined in December 2013?

It began as a typo of 'hold' on a forum during a price crash.

Roughly what proportion of all bitcoins is estimated to be lost forever?

One user threw out a hard drive holding 7,500 bitcoins in 2013; there is no recovery without the private key.

According to a 2025 Cambridge estimate, bitcoin mining uses about what share of global electricity?

Its emissions were put at 0.08% of the world total, comparable to Slovakia; the US had 38% of mining share in October 2025.

Which mining pool alarmed the community in 2014 by reaching 51% of the network's hashing power?

It voluntarily capped itself at 39.99%; anyone with a majority could censor transactions and double-spend.

Why does BTC not conform to the ISO 4217 currency standard?

ISO codes for global commodities must start with X, so Bloomberg uses XBT instead.

Which Austrian-school economist's The Denationalisation of Money is cited by the ECB as a root of bitcoin?

The Economist called bitcoin 'a techno-anarchist project to create an online version of cash'.

Which economist described bitcoin as a Ponzi scheme in 2014?

Legal scholar Eric Posner disagreed, calling it 'more like a collective delusion', and a World Bank report agreed it was not a deliberate Ponzi.

How did Federal Reserve chair Jerome Powell characterise bitcoin in 2024?

Fed chair nominee Kevin Warsh went further in 2025, calling it 'the new gold'.

In March 2025 President Trump signed an executive order establishing what?

Texas and New Hampshire followed with state reserves, and the Czech National Bank bought a small 'test portfolio'.

Which US agency issued the first guidelines for 'decentralized virtual currencies' in 2013?

It classed miners who sell their coins as money services businesses; that June the DEA made the first government seizure of bitcoin, 11.02 coins.

As of 2021, what percentage of holders controlled 27% of circulating bitcoin?

The Winklevoss twins and Elon Musk's Tesla and SpaceX have each bought and sold hundreds of millions of dollars' worth.

Which Finnish developer did Nakamoto task with creating content for the bitcoin.org website?

The domain itself had been registered on 18 August 2008, ten weeks before the white paper appeared.

What is the second-layer payment system proposed as a solution to bitcoin's scalability problem?

Both the 2017 SegWit and 2021 Taproot upgrades were partly designed to support it.

Around which year is the final bitcoin expected to be issued, after which miners earn only fees?

Because the block reward keeps halving, the last fractions of the 21 million supply trickle out over more than a century.

Which country held the largest share of global bitcoin mining, about 38%, as of October 2025?

Russia was second with 16%, and China still accounted for 14% despite having banned all cryptocurrency trading and mining in 2021.

To whom did Nakamoto hand the network alert key and control of the code repository before vanishing?

He went on to become lead developer at the Bitcoin Foundation, founded in September 2012 to promote the currency.

Which soft-fork upgrade, activated in November 2021, added Schnorr signatures to Bitcoin?

Until then Bitcoin signed transactions only with ECDSA on a custom elliptic curve; the upgrade also improved smart-contract functionality and Lightning Network support.