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Bitcoin history

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Bitcoin history begins with the publication of the Bitcoin design in 2008 and the launch of the network in January 2009. Its development includes changes to the protocol, the emergence of mining and exchange infrastructure, repeated market cycles, regulatory responses, and the adoption of bitcoin as a payment and investment asset. Because Bitcoin is a decentralized system rather than a company, its history involves several groups whose decisions do not always coincide: software contributors, miners, node operators, custodians, businesses, users, courts, and regulators.

Bitcoin history represented by the Bitcoin symbol, the word Bitcoin and BTC, with a timeline from 2008 to modern infrastructure
A visual overview of Bitcoin's development from its 2008 design to a global network and modern infrastructure.

This article presents selected events that changed the protocol, network operation, custody and market infrastructure, legal treatment, or measured adoption. It distinguishes failures of exchanges and other intermediaries from failures of the Bitcoin network itself. Price figures are rounded and dated because Bitcoin has no official closing price and early markets were fragmented.

Origins and launch, 2008–2010

Design and network launch, 2008–2009

Bitcoin combined ideas developed in earlier electronic-payment and proof-of-work research. David Chaum's blind-signature work described privacy-preserving electronic payments; Adam Back's Hashcash required computational work to deter abuse; Wei Dai's b-money and Nick Szabo's bit gold proposed forms of distributed digital money; and Hal Finney implemented reusable proofs of work. These systems differed materially from Bitcoin and did not produce the same decentralized consensus mechanism. The Bitcoin white paper explicitly cited Hashcash and b-money.[1][2][3][4][5]

The domain bitcoin.org was registered on 18 August 2008.[6] On 31 October 2008, a person or group using the name Satoshi Nakamoto announced Bitcoin: A Peer-to-Peer Electronic Cash System on the Cryptography mailing list. The paper described a system in which a peer-to-peer network timestamps transactions by hashing them into a proof-of-work chain, allowing participants to agree on an ordering without a central payment operator.[7][8]

The network began on 3 January 2009 with the genesis block. Its coinbase data included the text “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks,” which both timestamped the block and associated Bitcoin's launch with the financial conditions of the period.[9] Nakamoto announced Bitcoin version 0.1 on 8 January 2009 and directed readers to binaries hosted through SourceForge.[10] On 12 January, Nakamoto sent 10 BTC to Hal Finney in the first recorded person-to-person Bitcoin transaction.

During Bitcoin's first year, coins had no established exchange price. Participants experimented with mining, software, and informal valuation. In October 2009, the New Liberty Standard published an exchange rate derived from the estimated electricity cost of mining. Such calculations were not a centralized price; they were early attempts to value an asset with little liquidity and no established market.

Early commerce and the value-overflow incident, 2010

On 18 May 2010, Florida programmer Laszlo Hanyecz posted an offer of 10,000 BTC for two pizzas. On 22 May, he reported that the trade had been completed after forum user Jeremy Sturdivant, known as “jercos,” arranged delivery of two Papa John's pizzas.[11][12] The exchange is commemorated as Bitcoin Pizza Day because it provided a clear, public example of bitcoin being exchanged for ordinary goods.

Bitcoin also experienced its most serious early inflation bug in 2010. On 15 August, participants discovered that block 74,638 contained a transaction with two outputs of more than 92 billion BTC each. An integer-overflow flaw had allowed the software to accept output values totaling approximately 184.47 billion BTC, far above the intended supply limit. Developers released corrected software that rejected the transaction, and the chain produced under the corrected rules overtook the invalid branch.[13][14] The incident is historically important because the defect was in consensus validation itself, unlike later losses caused by exchange custody or fraud.

As mining difficulty increased, participants also began pooling work so that rewards could be distributed more regularly than in solo mining. A public pool was announced on the Bitcoin Forum in November 2010, and researchers were analyzing competing pooled-mining reward systems by the end of 2011.[15][16] Pooling reduced reward variance for individual participants while adding coordination and operator risks.

Nakamoto's last known public forum posts appeared in December 2010. Development continued through an open-source community rather than through a formal successor organization. Bitcoin's subsequent history is therefore not the history of a single company or leader.

Early markets and protocol development, 2011–2012

Exchanges, price discovery, and illicit-market attention, 2011

Dedicated trading venues increasingly replaced person-to-person price negotiation. Mt. Gox, which had originally been created for trading cards, became the largest early bitcoin exchange. Exchanges made price discovery and conversion to national currencies easier, but they also introduced custodial risk: users who deposited bitcoin depended on the operator to safeguard private keys, keep accurate records, and honor withdrawals.

Bitcoin experienced its first widely reported speculative rise and decline in 2011. It reached parity with the US dollar in February, rose above $30 on some exchanges in June, and then fell sharply. Quoted prices varied between venues, and operational failures could distort the market. The cycle nevertheless established a pattern that would recur: rapid appreciation attracted users and investment in infrastructure, while security failures, leverage, and thin liquidity amplified subsequent losses.

The Silk Road online marketplace also began operating in 2011 and used bitcoin as its principal payment method. Its growth brought attention to the use of pseudonymous payment records in illicit commerce. It did not make transactions untraceable: Bitcoin's public ledger later became one source of evidence used in investigations.[17] The distinction between pseudonymity, privacy, and anonymity became an enduring subject of technical and legal debate.

P2SH and the first halving, 2012

In April 2012, pay-to-script-hash became active under BIP 16. P2SH allowed a sender to pay a fixed-length hash while the recipient supplied the associated spending script when redeeming the funds. This made complex conditions, including multisignature arrangements, easier for senders to use without placing the full script in the original output.[18]

The block subsidy was reduced from 50 BTC to 25 BTC at block 210,000 on 28 November 2012. This was the first Bitcoin halving, an event programmed into the consensus rules approximately every 210,000 blocks.[19] The change reduced the rate of new issuance but did not directly set bitcoin's market price.

Regulation and exchange failures, 2013–2015

Chain split, regulation, and law enforcement, 2013

On 11 March 2013, Bitcoin versions 0.8 and earlier versions disagreed about the validity of a block because they used databases with different behavior. The result was a temporary split into two chains. Major mining pools downgraded to version 0.7 so that their hash power would extend the chain accepted by older nodes; exchanges and payment processors suspended activity while the network converged. BIP 50 recorded the cause, the coordination used to resolve it, and a successful test double-spend during the incident.[20] The event showed that implementation details could become de facto consensus constraints and that emergency coordination among economically significant participants could affect which valid-looking branch survived.

On 18 March, the US Financial Crimes Enforcement Network issued guidance for “convertible virtual currency.” It distinguished ordinary users from administrators and exchangers and explained when a business could be a money transmitter subject to registration, reporting, and anti-money-laundering obligations.[21] This was an early attempt to apply existing financial rules to Bitcoin businesses without treating the network itself as an issuing company.

In July, the US Securities and Exchange Commission charged Trendon Shavers and Bitcoin Savings and Trust with operating a bitcoin-denominated Ponzi scheme. In August, the federal court held that the investments at issue were securities, rejecting the argument that their bitcoin denomination placed them outside federal securities law.[22][23] The ruling applied securities law to the investment scheme; it did not classify every transfer of bitcoin as a securities transaction.

In October, US authorities shut down Silk Road and seized its domain and bitcoin held under controlled keys. The criminal case demonstrated both Bitcoin's role in a large illicit marketplace and the ability of law enforcement to seize bitcoin when it obtained the relevant credentials or keys.[17] On 29 October, a Robocoin kiosk in a Vancouver coffee shop began operating as the first widely recognized public Bitcoin ATM, allowing customers to exchange Canadian dollars and bitcoin.[24] Two US Senate committees held hearings in November that examined money laundering, consumer risk, payment innovation, and possible legitimate uses rather than treating virtual currency solely as a criminal instrument.[25][26]

Market activity expanded at the same time. Bitcoin rose from roughly $13 at the beginning of 2013 to more than $1,100 on one contemporary composite index in early December, then declined sharply.[27] The figures describe one index rather than an official global price; liquidity remained fragmented among exchanges.

Mt. Gox and tax treatment, 2014

Mt. Gox stopped withdrawals and entered bankruptcy proceedings in February 2014 after reporting that hundreds of thousands of customers' bitcoin were missing. The exchange had once handled a dominant share of bitcoin trading, so its failure disrupted liquidity and public confidence. Later US indictments alleged that attackers obtained unauthorized access to Mt. Gox wallet servers beginning in 2011 and stole approximately 647,000 BTC through at least 2014.[28] Because those statements concern criminal charges, they describe allegations rather than a final adjudication. The established historical point is that Mt. Gox was a custodial and operational failure: it did not reverse Bitcoin's proof-of-work chain or change the protocol's supply rules.

In March 2014, the US Internal Revenue Service stated that convertible virtual currency would be treated as property for federal tax purposes. The notice explained that mining receipts, payments, sales, and exchanges could create income or gains measured in US dollars.[29] A broader Government Accountability Office review later that year connected exchange losses, volatility, emerging investment products, law-enforcement concerns, and consumer protection. It noted that exchange and wallet customers generally lacked protections comparable to deposit insurance.[27]

Licensing, commodity treatment, VAT, and scaling disagreement, 2015

In February, a federal jury found Ross Ulbricht guilty on all seven counts arising from his operation of Silk Road.[30] The conviction connected Bitcoin's early illicit-market history with a completed criminal adjudication, rather than only an investigation or allegation.

New York's Department of Financial Services issued 23 NYCRR Part 200 in June 2015. The specialized licensing regime, commonly called the BitLicense, applied to defined virtual-currency business activity involving New York or New York residents.[31]

BIP 66 tightened the encoding rules for ECDSA signatures. When its enforcement threshold was reached in July, several large miners that had signaled support nevertheless extended an invalid block without fully validating it. This produced invalid forks of six blocks and three blocks and prompted warnings to users of lightweight and outdated wallet software.[32][33] The incident showed that signaling readiness for a rule change was not equivalent to actually validating its rules.

In September, the US Commodity Futures Trading Commission's Coinflip order found that bitcoin and other virtual currencies were commodities under the Commodity Exchange Act, bringing derivatives and certain leveraged products within the agency's established authority.[34]

In October, the Court of Justice of the European Union held that exchanging bitcoin and traditional currencies was exempt from value-added tax under the applicable EU directive. The ruling treated the exchange service as a financial transaction for VAT purposes; it did not make bitcoin legal tender.[35]

The year also brought the block-capacity dispute into organized public conflict. BIP 101 proposed a schedule of increases to the maximum block size, and Bitcoin XT distributed code supporting that approach.[36] Opponents argued that larger blocks could raise the cost of independently validating the chain; proponents emphasized transaction throughput and fees. The disagreement concerned both technical trade-offs and how incompatible consensus changes should gain adoption.

Scaling conflict and market infrastructure, 2016–2018

Lightning design and the second halving, 2016

Joseph Poon and Thaddeus Dryja published the Lightning Network paper in January 2016. It described a network of payment channels in which participants could update balances off-chain while retaining the ability to enforce the latest valid state on Bitcoin.[37] Lightning was not a replacement ledger; opening and closing channels and resolving disputes continued to depend on Bitcoin transactions.

The second halving occurred on 9 July 2016 at block 420,000, reducing the block subsidy to 12.5 BTC.[19]

In August, attackers stole approximately 120,000 BTC from the Bitfinex exchange.[38] As with Mt. Gox, the theft was a failure at a custodial intermediary rather than a reversal of Bitcoin transactions. Japan also amended its Payment Services Act in 2016; provisions enforced in April 2017 introduced a registration system for businesses exchanging virtual currency and fiat currency.[39]

Development of Segregated Witness continued during the year. SegWit moved signature-related data into a separate transaction structure, addressed transaction malleability for segregated signatures, and introduced block weight as a new capacity measure.[40]

SegWit, Bitcoin Cash, and regulated futures, 2017

Unicode 10.0, released in June, added the character U+20BF ₿ BITCOIN SIGN, making a standardized bitcoin currency symbol available to software and publishers.[41]

The scaling dispute intensified in 2017. SegWit activated in August after miners signaled the required support. On 1 August, participants favoring different block-capacity rules created Bitcoin Cash through a chain split. Bitcoin and Bitcoin Cash share transaction history before the split but use different consensus rules afterward. The fork did not rename or transfer control of the original Bitcoin network.

Bitcoin's market price rose from below $1,000 at the start of the year to nearly $20,000 on some markets in December before a large decline in 2018. Regulated derivatives also appeared. Cboe began trading cash-settled bitcoin futures on 10 December, and CME launched its contract on 18 December.[42][43] These products expanded price discovery and hedging within regulated derivatives markets but did not provide direct ownership of bitcoin.

Lightning beta and CVE-2018-17144, 2018

Lightning implementations moved from testing toward limited mainnet use. In March, Lightning Labs released `lnd` 0.4-beta, its first mainnet beta. The developers directed it at technical users and advised experimentation with small amounts, reflecting the early state of the software.[44]

In September, Bitcoin Core disclosed CVE-2018-17144 and urged node operators to upgrade to version 0.16.3. The flaw was initially described as a denial-of-service problem but could also have allowed inflation and a chain split if exploited.[45] The episode showed that even mature consensus software remained vulnerable to implementation errors and depended on timely review and upgrades.

Institutional access and protocol development, 2019–2021

Custody and regulated access, 2019–2020

Market infrastructure continued to connect Bitcoin with regulated finance. Bakkt launched physically delivered bitcoin futures in September 2019, combining futures trading, clearing, and custody.[46] This differed from cash-settled contracts because delivery could involve bitcoin held by the custodian, although customers still depended on regulated intermediaries.

In March 2020, bitcoin fell sharply during a broad flight to liquidity at the onset of the COVID-19 pandemic. Its later recovery occurred alongside extraordinary monetary and fiscal measures and increased participation in digital-asset markets, but no single factor explains the entire price cycle. The third halving occurred on 11 May at block 630,000, reducing the subsidy to 6.25 BTC.[19]

The US Office of the Comptroller of the Currency stated in July that national banks and federal savings associations could provide cryptocurrency custody services, including safeguarding cryptographic keys.[47] In August, MicroStrategy disclosed that it had purchased 21,454 BTC for $250 million as part of its treasury strategy.[48] Other public companies later adopted or rejected similar policies; the significance of the disclosure was that a listed operating company had made bitcoin a material treasury asset, not that the approach became a general corporate standard.

PayPal announced in October that eligible US customers would be able to buy, hold, and sell selected cryptocurrencies. The initial product did not permit customers to withdraw coins to external wallets, so it expanded price exposure more than self-custodied use of the network.[49]

Tesla disclosed in February that it had purchased $1.5 billion in bitcoin under a revised investment policy. It briefly accepted bitcoin for vehicle purchases before suspending the payment option in May.[50][51] Coinbase completed a direct listing of its Class A shares on Nasdaq on 14 April.[52] These events connected Bitcoin markets more visibly with listed US companies, while neither amounted to protocol adoption or eliminated price and custody risk.

Restrictions imposed in China during 2021 sharply reduced Bitcoin mining there and contributed to a temporary decline in network hash rate. Cambridge Centre for Alternative Finance estimates later showed mining activity redistributing to other jurisdictions and the network's total hash rate recovering. The measurements were estimates based partly on participating mining pools and should not be read as a complete census.[53][54]

El Salvador's Bitcoin Law took effect in September, making bitcoin legal tender alongside the US dollar. The government introduced the Chivo wallet and a sign-up incentive. A representative household survey published by the National Bureau of Economic Research found substantial initial downloads but limited continued use after the incentive was spent; cash and dollars remained dominant for everyday transactions.[55] The episode distinguished legal designation from measured adoption.

In October, the ProShares Bitcoin Strategy ETF began trading after its registration became effective. It held bitcoin futures rather than spot bitcoin, expanding brokerage access while creating a different exposure from direct ownership.[56]

Taproot activated at block 709,632 on 14 November. BIP 341 introduced Taproot spending rules, combining Schnorr signatures and Merkle-based script commitments to improve flexibility and privacy in some complex spending conditions.[57] Activation did not automatically update wallets and services, so adoption of the new output type was gradual.

Crypto-sector failures and new uses of block space, 2022–2023

Deleveraging and custodial failures, 2022

Bitcoin's market price declined sharply in 2022 amid tighter financial conditions and a sequence of failures in the wider cryptocurrency sector. In May, the TerraUSD stablecoin lost its peg and the Terra ecosystem collapsed. A US jury later found Terraform Labs and Do Kwon liable for securities fraud, and a 2024 settlement imposed financial remedies and wound down the company.[58] Terra was not part of Bitcoin's consensus system, but its failure forced losses and liquidations across interconnected trading and lending businesses.

Celsius Network halted withdrawals in June and filed for bankruptcy in July. Its founder later pleaded guilty and was sentenced for fraud and market manipulation involving the company's business and CEL token.[59] The failures of Three Arrows Capital and Voyager Digital contributed to the same credit-contagion cycle, as loans, collateral, and claims linked otherwise separate firms.

FTX failed in November after a run on customer withdrawals exposed a shortfall. Its founder, Sam Bankman-Fried, was subsequently convicted of fraud and conspiracy and sentenced to 25 years in prison; the criminal case established that billions of dollars in customer funds had been misappropriated.[60] FTX's collapse reduced market liquidity and harmed bitcoin holders who had entrusted assets to the exchange, but it did not rewrite confirmed Bitcoin transactions.

The Bank for International Settlements found that the Terra/Luna and FTX shocks caused large losses within crypto markets but little discernible spillover to broader financial conditions. Its analysis also concluded that many retail users of crypto-trading applications probably lost money during the period.[61] Together, the events demonstrated that ownership through an intermediary can reintroduce counterparty, leverage, and governance risks that the Bitcoin protocol does not remove.

Network operation remained separate from those insolvencies. By early 2022, estimated hash rate had recovered from its China-related decline and mining had become more geographically distributed.[54] This did not eliminate concentration or environmental concerns, but it showed that a large regional disruption had not permanently stopped block production.

Ordinals and the Grayscale decision, 2023

The Ordinals project, released in early 2023, assigned serial numbers to satoshis and used Taproot witness data to associate content with them through transactions called inscriptions. The software did not require a new Bitcoin consensus rule; it used transaction forms already valid under existing rules.[62][63] Inscriptions became a significant source of block-space demand and fees. Supporters treated them as a new use of the network, while critics objected to their effect on fees, storage, and node resources. The dispute illustrated that consensus-valid activity can remain socially and economically controversial.

In June, the iShares Bitcoin Trust filed an initial registration statement with the SEC for a spot bitcoin product sponsored through a BlackRock affiliate.[64] The filing was a proposal, not an approval, but it became part of the sequence leading to the agency's January 2024 decisions.

On 29 August, the US Court of Appeals for the District of Columbia Circuit vacated the SEC's rejection of Grayscale's proposal to convert its Bitcoin trust into a spot exchange-traded product. The court held that the agency had not adequately explained why it treated the proposal differently from materially similar bitcoin-futures products.[65] The judgment did not itself approve the product, but it removed the challenged denial and became an important step toward the SEC's decisions in January 2024.

Spot ETPs, the fourth halving, and reserve policy, 2024–2025

Spot exchange-traded products and halving, 2024

On 10 January 2024, the US Securities and Exchange Commission approved exchange rule changes allowing several spot bitcoin exchange-traded products to list and trade. Unlike futures-based funds, these products held bitcoin through custodians to support their shares. The approval concerned regulated investment products; it did not endorse bitcoin, guarantee the products, or change the Bitcoin protocol.[66]

The fourth halving occurred at block 840,000 on 20 April 2024 UTC, reducing the block subsidy to 3.125 BTC.[19] Fees briefly formed an unusually large share of miner revenue around the event. The long-term security implications of declining subsidies remain debated because they depend on future demand for block space, fee levels, bitcoin's market value, mining costs, and network participation.

Spot products increased the amount of bitcoin held through regulated fund and custody structures. They broadened access through conventional brokerage accounts but did not give shareholders possession of the underlying private keys. Their growth therefore expanded institutional access while concentrating some holdings among a smaller number of custodians.

On major spot markets, bitcoin first traded above US$100,000 during 4–5 December, depending on time zone.[67] The threshold was a market-price milestone rather than a protocol event, and values still differed among venues.

National, state, and central-bank experiments, 2025

In January 2025, El Salvador amended its Bitcoin framework so that private-sector acceptance became voluntary and public-sector involvement was constrained under an agreement with the International Monetary Fund. The change removed core compulsory features of the original legal-tender policy while leaving private use possible.[68] The reversal underscored the difference between announcing legal status and sustaining widespread transactional adoption.

On 6 March, a US executive order established a Strategic Bitcoin Reserve and a separate Digital Asset Stockpile. The order directed that the reserve initially be capitalized with bitcoin already owned by the federal government through final forfeiture proceedings, prohibited agencies from selling reserve bitcoin, and called for study of budget-neutral acquisition strategies. It did not order an immediate open-market purchase.[69]

Texas enacted legislation effective 20 June establishing a state Strategic Bitcoin Reserve framework, an example of reserve policy extending below the federal level.[70] In November, the Czech National Bank announced a USD 1 million digital-asset test portfolio that included bitcoin but was explicitly outside its international reserves. The pilot was designed to test custody, legal, accounting, audit, and security processes rather than implement monetary-reserve adoption.[71]

These policies had different legal and financial meanings. Forfeited-asset retention, a state-managed fund, and a central-bank test portfolio should not all be described as equivalent “Bitcoin reserves.”

Recurring themes

Protocol risk and intermediary risk

Bitcoin history includes failures at different layers. The 2010 value-overflow incident, the 2013 chain split, and CVE-2018-17144 involved consensus or node software. Mt. Gox, Celsius, and FTX involved organizations holding assets or claims for customers. A protocol defect can affect which transactions nodes accept; a custodian can lose, misuse, or freeze a customer's bitcoin without invalidating the blockchain. The distinction does not make self-custody risk-free: users who control keys can still lose them, sign malicious transactions, or use faulty software.

Mining geography and environmental measurement

Proof-of-work mining converts electricity and computing equipment into the work used to order blocks and make revisions costly. Estimates of electricity use, energy mix, and emissions depend on different data and assumptions. Mining-pool data can estimate hash-rate geography but do not identify every facility; electricity-consumption models estimate ranges rather than directly meter the network. The 2021–2022 relocation showed that geographic shares can change quickly in response to regulation, energy prices, and access to equipment. Energy use, energy source, and carbon emissions are related but are not interchangeable measures.

Historical price measurement

Bitcoin has no official closing price. Historical figures depend on the exchange, quote currency, time zone, and method used to aggregate trades. Early markets were especially fragmented and thinly traded. Later benchmarks, such as the CME CF Bitcoin Reference Rate, aggregate executed trades from selected constituent exchanges under a published methodology, but they begin only after Bitcoin's earliest years.[72]

Price cycles are historically significant because they affected public attention, mining revenue, leverage, business formation, and losses. They should not be treated as a complete history or assigned a single cause. Protocol changes, legal decisions, custody failures, and changes in mining geography can be important without producing an immediate or uniquely attributable market movement.

Halving timeline

Date (UTC) Block height Subsidy before Subsidy after
28 November 2012 210,000 50 BTC 25 BTC
9 July 2016 420,000 25 BTC 12.5 BTC
11 May 2020 630,000 12.5 BTC 6.25 BTC
20 April 2024 840,000 6.25 BTC 3.125 BTC

Halving dates describe when the relevant block was mined. Future dates are estimates because block intervals vary.

The following links appeared in the previous version of this article and are retained for continuity. Some are contemporary reporting, community records, commercial market commentary, or general destination pages rather than primary evidence for the central claims above. Destinations may have changed since they were originally cited.

See also

References

  1. ↑ David Chaum, “Blind Signatures for Untraceable Payments”, Advances in Cryptology, 1983.
  2. ↑ Adam Back, “Hashcash — A Denial of Service Counter-Measure”, 2002.
  3. ↑ Wei Dai, “b-money”, 1998.
  4. ↑ Nick Szabo, “Bit Gold”, 29 December 2005.
  5. ↑ Hal Finney, “RPOW — Reusable Proofs of Work”, Cryptography mailing list, August 2004.
  6. ↑ Bitcoin.org, “Bitcoin.org is 10 years old”, 18 August 2018.
  7. ↑ Satoshi Nakamoto, “Bitcoin P2P e-cash paper”, Cryptography mailing list, 31 October 2008.
  8. ↑ Satoshi Nakamoto, Bitcoin: A Peer-to-Peer Electronic Cash System, 2008.
  9. ↑ Bitcoin Core, chain parameters, source code containing the genesis-block construction.
  10. ↑ Satoshi Nakamoto, “Bitcoin v0.1 released”, Cryptography mailing list, 8 January 2009.
  11. ↑ Laszlo Hanyecz, “Pizza for bitcoins?”, Bitcoin Forum, May 2010.
  12. ↑ Associated Press, “Billion dollar pizza? Bitcoin soars on key anniversary of crypto's growth”, 22 May 2025.
  13. ↑ Jeff Garzik, “Strange block 74638”, Bitcoin Forum, 15 August 2010.
  14. ↑ “overflow bug SERIOUS”, Bitcoin Forum development discussion, August 2010.
  15. ↑ slush, “Bitcoin pooled mining”, Bitcoin Forum, 27 November 2010.
  16. ↑ Meni Rosenfeld, “Analysis of Bitcoin Pooled Mining Reward Systems”, 2011.
  17. ↑ 17.0 17.1 US Attorney's Office for the Southern District of New York, “Manhattan U.S. Attorney Announces Seizure of Additional $28 Million Worth of Bitcoins Belonging to Ross William Ulbricht”, 25 October 2013.
  18. ↑ BIP 16: Pay to Script Hash, accessed 1 September 2026.
  19. ↑ 19.0 19.1 19.2 19.3 Bitcoin.org, “Bitcoin Block Reward Halving Countdown”, historical halving table, accessed 1 September 2026.
  20. ↑ BIP 50: March 2013 Chain Fork Post-Mortem, accessed 1 September 2026.
  21. ↑ FinCEN, “Application of FinCEN's Regulations to Persons Administering, Exchanging, or Using Virtual Currencies”, 18 March 2013.
  22. ↑ US Securities and Exchange Commission, “SEC Charges Texas Man With Running Bitcoin-Denominated Ponzi Scheme”, 23 July 2013.
  23. ↑ SEC v. Shavers, No. 4:13-CV-416, memorandum opinion regarding subject-matter jurisdiction, US District Court for the Eastern District of Texas, 6 August 2013.
  24. ↑ Wired, “World's First Bitcoin ATM Arrives at Coffee Shop”, 28 October 2013.
  25. ↑ US Senate Committee on Homeland Security and Governmental Affairs, “Beyond Silk Road: Potential Risks, Threats, and Promises of Virtual Currencies”, 18 November 2013.
  26. ↑ US Senate Committee on Banking, Housing, and Urban Affairs, “The Present and Future Impact of Virtual Currency”, 19 November 2013.
  27. ↑ 27.0 27.1 US Government Accountability Office, Virtual Currencies: Emerging Regulatory, Law Enforcement, and Consumer Protection Challenges, GAO-14-496, 29 May 2014.
  28. ↑ US Department of Justice, “Russian Nationals Charged With Hacking One Cryptocurrency Exchange and Illicitly Operating Another”, 9 June 2023.
  29. ↑ Internal Revenue Service, Notice 2014-21, 25 March 2014.
  30. ↑ US Attorney's Office for the Southern District of New York, “Ross Ulbricht ... Found Guilty ... on All Counts”, 5 February 2015.
  31. ↑ New York State Department of Financial Services, “Virtual Currency Business Licensing”, accessed 1 September 2026.
  32. ↑ BIP 66: Strict DER signatures, accessed 1 September 2026.
  33. ↑ Bitcoin.org, “Some Miners Generating Invalid Blocks”, updated 15 July 2015.
  34. ↑ Commodity Futures Trading Commission, “CFTC Orders Bitcoin Options Trading Platform Operator and its CEO to Cease Illegally Offering Bitcoin Options”, 17 September 2015.
  35. ↑ Court of Justice of the European Union, “The exchange of traditional currencies for units of the ‘bitcoin’ virtual currency is exempt from VAT”, Press Release No. 128/15, 22 October 2015.
  36. ↑ BIP 101: Increase maximum block size, accessed 1 September 2026.
  37. ↑ Joseph Poon and Thaddeus Dryja, The Bitcoin Lightning Network: Scalable Off-Chain Instant Payments, 14 January 2016.
  38. ↑ US Attorney's Office for the District of Columbia, “2016 Bitfinex Hack”, accessed 1 September 2026.
  39. ↑ Financial Services Agency of Japan, “Discussion Paper on the Crypto-Asset System”, 10 April 2025, pp. 2–3.
  40. ↑ BIP 141: Segregated Witness (Consensus layer), accessed 1 September 2026.
  41. ↑ Unicode Consortium, “Announcing The Unicode Standard, Version 10.0”, 20 June 2017.
  42. ↑ Cboe Global Markets, “Cboe Bitcoin Futures Open for Trading”, 10 December 2017.
  43. ↑ CME Group, “CME Group Self-Certifies Bitcoin Futures to Launch Dec. 18”, 1 December 2017.
  44. ↑ Olaoluwa Osuntokun, “Announcing our first Lightning mainnet release, lnd 0.4-beta!”, Lightning Labs, 15 March 2018.
  45. ↑ Bitcoin.org, “Notice of Required Upgrade to 0.16.3”, 21 September 2018.
  46. ↑ Bakkt Holdings, Form S-1 registration statement, filed with the US Securities and Exchange Commission, 21 June 2021.
  47. ↑ Office of the Comptroller of the Currency, “Federally Chartered Banks and Thrifts May Provide Custody Services For Crypto Assets”, 22 July 2020.
  48. ↑ MicroStrategy Incorporated, Form 8-K, 11 August 2020.
  49. ↑ PayPal, “PayPal Launches New Service Enabling Users to Buy, Hold and Sell Cryptocurrency”, 21 October 2020.
  50. ↑ Tesla, Inc., Form 10-K, filed 8 February 2021.
  51. ↑ Tesla, Inc., Form 10-Q, filed 27 July 2021.
  52. ↑ Coinbase Global, Inc., 2022 Annual Report, p. 77.
  53. ↑ Cambridge Centre for Alternative Finance, “New data reveals timeline of China’s bitcoin mining exodus”, 15 July 2021.
  54. ↑ 54.0 54.1 Cambridge Centre for Alternative Finance, “Bitcoin mining electricity update: new data”, 17 May 2022.
  55. ↑ Fernando Alvarez, David Argente, and Diana Van Patten, “Are Cryptocurrencies Currencies? Bitcoin as Legal Tender in El Salvador”, NBER Working Paper 29968, April 2022.
  56. ↑ ProShares Trust, SEC filing for Bitcoin Strategy ETF, effective 18 October 2021.
  57. ↑ BIP 341: Taproot, accessed 1 September 2026.
  58. ↑ US Securities and Exchange Commission, “Terraform Labs and Kwon to Pay $4.5 Billion Following Fraud Verdict”, 13 June 2024.
  59. ↑ US Attorney's Office for the Southern District of New York, “Founder of Celsius Sentenced to 12 Years for Fraud and Market Manipulation”, 8 May 2025.
  60. ↑ US Attorney's Office for the Southern District of New York, “Samuel Bankman-Fried Sentenced to 25 Years for His Orchestration of Multiple Fraudulent Schemes”, 28 March 2024.
  61. ↑ Bank for International Settlements, “Crypto shocks and retail losses”, BIS Bulletin No. 69, 20 February 2023.
  62. ↑ Ordinal Theory Handbook, accessed 1 September 2026.
  63. ↑ Ordinals project, “Inscriptions”, source documentation, accessed 1 September 2026.
  64. ↑ iShares Bitcoin Trust, Form S-1, filed 15 June 2023.
  65. ↑ Grayscale Investments, LLC v. Securities and Exchange Commission, No. 22-1142, US Court of Appeals for the District of Columbia Circuit, decided 29 August 2023.
  66. ↑ Gary Gensler, “Statement on the Approval of Spot Bitcoin Exchange-Traded Products”, US Securities and Exchange Commission, 10 January 2024.
  67. ↑ Associated Press, “Bitcoin has surpassed the $100,000 mark as the post-election rally continues”, 5 December 2024.
  68. ↑ International Monetary Fund, El Salvador: Selected Issues, 19 March 2025.
  69. ↑ The White House, “Establishment of the Strategic Bitcoin Reserve and United States Digital Asset Stockpile”, 6 March 2025.
  70. ↑ Texas Legislature Online, SB 21 history, 89th Regular Session, accessed 1 September 2026.
  71. ↑ Czech National Bank, “Digital assets pilot”, November 2025.
  72. ↑ CME Group, “Analysis of the CME CF Bitcoin Reference Rate”, accessed 1 September 2026.
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