47 Fun Facts About Bitcoin

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

Satoshi Nakamoto posted 'Bitcoin: A Peer-to-Peer Electronic Cash System' to the metzdowd cryptography mailing list on 31 October 2008; the identity behind the name has never been confirmed.

On what date was the Bitcoin genesis block mined?

The genesis block was mined on 3 January 2009 with a 50-bitcoin reward that can never be spent; it carried a newspaper headline from that day.

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?

Laszlo Hanyecz paid 10,000 BTC for two Papa John's pizzas, ordered for him by another forum user, on 22 May 2010; the date is celebrated as Bitcoin Pizza Day.

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

Bitcoin's supply is capped at 21 million coins, enforced by the halving schedule written into the protocol; by the April 2024 halving about 19.7 million had already been mined.

How often does the bitcoin block reward halve?

The block reward halves every 210,000 blocks, roughly every four years; it fell from 50 bitcoins in 2009 to 3.125 after the April 2024 halving.

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

Bitcoin targets one block every 10 minutes on average; the difficulty is recalibrated every 2,016 blocks, about two weeks, to hold that pace as mining power changes.

What is the smallest unit of bitcoin called?

The satoshi is one hundred-millionth of a bitcoin, so a millibitcoin is 100,000 satoshis; the unit is named after the currency's pseudonymous creator.

Which hashing algorithm does Bitcoin use to chain its blocks?

Bitcoin uses SHA-256: each block header is hashed twice with it, and every header includes the SHA-256 hash of the previous block, chaining them together.

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

Bitcoin uses proof of work: miners hunt for a nonce that makes the block hash fall below a difficulty target, a result that is hard to find but easy to verify.

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

The coinbase transaction is the first in each block and pays the miner the subsidy plus fees; every bitcoin in existence was created this way, and the exchange Coinbase later took the name.

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

Nakamoto quietly added a one megabyte block size limit in 2010 as an anti-spam measure; by 2015–17 the cap was at the heart of the 'block size wars' over how to scale.

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

Segregated Witness (SegWit) activated in August 2017, moving signature data out of the base block to fix transaction malleability and raise effective capacity, which made payment channels practical.

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

Bitcoin Cash split from Bitcoin on 1 August 2017 with an 8 MB block limit, backed by big-block supporters such as Roger Ver; Bitcoin Gold and Bitcoin SV followed as further forks.

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

Analyses of early mining patterns, notably Sergio Lerner's 'Patoshi' study published in 2013, suggest Nakamoto mined about one million bitcoins in 2009–10.

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

The profile described a 37-year-old man living in Japan with a birthday of 5 April 1975, read by some as a nod to the 5 April 1933 US gold-ownership ban 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?

Newsweek's March 2014 cover story by Leah McGrath Goodman named Dorian Satoshi Nakamoto of Temple City, California; the dormant P2P Foundation account then posted 'I am not Dorian Nakamoto'.

Which self-proclaimed Nakamoto was ruled by a London judge in 2024 not to be him?

Craig Wright, an Australian computer scientist, was ruled not to be Nakamoto by Mr Justice Mellor at the High Court in March 2024; Wired had 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?

Adam Back's Hashcash (1997) made senders compute a partial hash collision to deter spam; Nakamoto's white paper cites it as the basis of bitcoin's proof-of-work mining.

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

Silk Road, launched in February 2011, took only bitcoin; the FBI said it handled about 9.5 million bitcoins in sales before its October 2013 shutdown, run by Ross Ulbricht as 'Dread Pirate Roberts'.

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

In May 2015 Ulbricht was given two life terms plus 40 years with no possibility of parole; President Trump granted him a full pardon on 21 January 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?

El Salvador's Bitcoin Law, pushed by President Nayib Bukele, took effect on 7 September 2021; in January 2025 the assembly made acceptance voluntary to secure a $1.4 billion IMF loan.

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

The Central African Republic made bitcoin legal tender alongside the CFA franc in April 2022 under President Touadéra, but repealed the law in March 2023 under pressure from the regional central bank BEAC.

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

Bitcoin's market capitalisation first topped $1 trillion on 19 February 2021, when the price passed roughly $53,000; the rally was fuelled by Tesla's $1.5 billion purchase disclosed that month.

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

Bitcoin first crossed $100,000 on 5 December 2024, weeks after Donald Trump's election win and hours after he named crypto-friendly Paul Atkins to lead the SEC.

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

The SEC approved 11 spot bitcoin ETFs on 10 January 2024, including BlackRock's IBIT and Grayscale's converted GBTC, and they began trading the next day; ProShares' BITO futures ETF had launched in October 2021.

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

MicroStrategy, led by Michael Saylor, bought $250 million of bitcoin in August 2020 as its treasury reserve; Square followed with $50 million in October and MassMutual with $100 million in December.

Which bitcoin slang term began as a forum typo in December 2013?

'Hodl' began as a typo of 'hold' in a Bitcointalk post titled 'I AM HODLING' on 18 December 2013, written during a price crash; it came to mean holding through volatility.

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?

The 2025 Cambridge Digital Mining Industry Report put bitcoin mining at about 138 TWh a year, roughly 0.5% of global electricity use, with emissions near 0.08% of the world total, comparable to Slovakia.

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

Ghash.io briefly exceeded 51% of bitcoin's hashing power in June 2014, then pledged to cap itself at 39.99%; a majority miner could censor transactions and double-spend.

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

Under ISO 4217 the first two letters are a country code, and BT is Bhutan's, so BTC would read as a Bhutanese currency; non-national units start with X, hence the XBT code used by Bloomberg.

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

Friedrich Hayek's 1976 book The Denationalisation of Money argued for competing private currencies; the ECB's 2012 report 'Virtual Currency Schemes' traced bitcoin's theoretical roots to that Austrian-school idea.

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.

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

Trump's 6 March 2025 executive order created a Strategic Bitcoin Reserve, seeded with coins already forfeited to the federal government; New Hampshire and Texas passed state reserve laws later that year.

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

FinCEN's March 2013 guidance was the first, classing those who create and sell virtual currency 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?

A 2021 NBER study by Igor Makarov and Antoinette Schoar found the top 10,000 investors, roughly 0.01% of holders, controlled about 27% of circulating bitcoin.

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

Martti Malmi, a Finnish student known as Sirius, was asked by Nakamoto in 2009 to build out bitcoin.org and became the project's second developer; the domain had been registered on 18 August 2008.

Which second-layer network routes bitcoin payments through off-chain channels?

The Lightning Network, proposed by Joseph Poon and Thaddeus Dryja in a 2015 white paper, routes payments through off-chain channels and settles on bitcoin's base layer; it went live in 2018.

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 in 2025?

The United States led bitcoin mining through 2025 with more than a third of global hashrate, hosting large operations in Texas; China's 2021 ban had pushed miners abroad.

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

Gavin Andresen received the alert key and control of the code repository from Nakamoto in late 2010, became Bitcoin's lead developer, and served as chief scientist of the Bitcoin Foundation founded in September 2012.

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

Taproot (BIPs 340–342) activated at block 709,632 on 14 November 2021, adding Schnorr signatures alongside the existing ECDSA on secp256k1 and making complex spending conditions cheaper and more private.