History of Bitcoin

The table below lists the events in this article whose dates are settled and that come up most often. The sections that follow fill in the background.

Bitcoin did not appear out of nowhere. Decades of earlier attempts at digital currency led up to it.

In 1983, the cryptographer David Chaum published the concept of electronic money based on "blind signatures." In 1989 he founded DigiCash and began building an anonymous electronic payment system called "eCash" that went into service between 1994 and 1995. Too few banks signed on, and the company went bankrupt in 1998.

In 1997, Adam Back invented "Hashcash," which imposed a computational cost (Proof of Work) to deter spam email. The same idea later became the basis of Bitcoin's mining.

In 1998, Wei Dai proposed "b-money" and Nick Szabo proposed "Bit Gold." Both described decentralized digital currencies, but neither was fully implemented.

Not all of these appear in the whitepaper. Of its eight references, only two come from the prehistory described here: Wei Dai's b-money [1] and Adam Back's Hashcash [6]. Neither Chaum's eCash nor Szabo's Bit Gold is in the reference list. The early correspondence still shows that Satoshi designed Bitcoin with this lineage in view. All eight references are covered in "The Bitcoin Whitepaper, Section by Section."

Cypherpunks are activists and technologists who argue for protecting privacy with cryptography. The movement grew out of a mailing list founded in 1992 by Eric Hughes, Timothy May, and John Gilmore.

Eric Hughes published "A Cypherpunk's Manifesto" in 1993, declaring: "Privacy is not secrecy. Privacy is the power to selectively reveal oneself to the world."

They pushed forward PGP encryption, anonymous remailers, and electronic money, treating cryptography as a defense against government surveillance and censorship.

Bitcoin's creator, Satoshi Nakamoto, came directly out of this cypherpunk tradition. A currency that could move value without a central authority was one of the movement's long-standing goals.

On October 31, 2008, someone using the name Satoshi Nakamoto posted a paper titled "Bitcoin: A Peer-to-Peer Electronic Cash System" to a cryptography mailing list.

The nine-page paper proposed a system of electronic money that could be sent directly over the internet, with no third party such as a bank in between.

At its center was the "blockchain": a distributed ledger that bundles transaction records into blocks and links those blocks with cryptographic hashes. That structure solved the double-spending problem without a central authority.

Lehman Brothers had collapsed six weeks earlier, and the global financial crisis was in full swing. Bitcoin's arrival amid growing distrust of the existing financial system struck many readers as symbolic.

On January 3, 2009, at 18:15 UTC, Satoshi Nakamoto mined the first block of the Bitcoin network, the genesis block (block 0).

Embedded in the coinbase (reward transaction) of this block was a headline from The Times: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks." It was both a comment on bailout politics and a statement of why Bitcoin existed.

The primary record for software version 0.1 is Satoshi's own announcement email, sent to the cryptography mailing list on January 8, 2009 at 19:27 UTC. The SourceForge release is widely dated January 9, but the source that announced it is dated the 8th. Either way, anyone could join the network from that point on.

On January 12, a payment from Satoshi to Hal Finney was recorded in block 170, the first Bitcoin transaction ever made. Finney tweeted "Running bitcoin," and is remembered as one of Bitcoin's first users.

On May 22, 2010, the Florida programmer Laszlo Hanyecz bought two pizzas for 10,000 BTC. It was the first time Bitcoin was used to buy something in the physical world.

Those 10,000 BTC were worth about $41 at the time. The trade was a historic moment, proving that Bitcoin could actually be exchanged for physical goods.

Communities around the world celebrate May 22 as "Bitcoin Pizza Day" each year. It is one of the best-loved anniversaries in crypto.

As the price rose, those same 10,000 BTC came to be worth hundreds of millions of dollars (the exact figure moves with the market, which is highly volatile). The story is now told as "the most expensive pizza in history."

The Mt.Gox exchange opened in July 2010. The site had originally traded Magic: The Gathering cards, and the American developer Jed McCaleb launched the Bitcoin exchange there. It became "the Tokyo-based exchange" only after McCaleb sold it to Mark Karpelès in March 2011; it was not based in Japan at the outset.

Bitcoin reached $1 for the first time in February 2011. By June it had climbed to around $30, then crashed after a hack on Mt.Gox.

Also in 2011, press coverage of Silk Road, a dark web marketplace used to sell illegal drugs, opened a public argument about how anonymous Bitcoin really was.

The first halving came at block 210,000 on November 28, 2012, cutting the mining reward from 50 BTC to 25 BTC. It was the first evidence that the issuance schedule worked as designed.

Bitcoin rose steeply through 2013, passing $1,000 in November. The entry of the Chinese market was a major factor.

In February 2014, Mt.Gox, then the world's largest Bitcoin exchange, announced the loss of about 850,000 BTC (roughly $450 million at the time). What it filed with the Tokyo District Court on February 28 was not bankruptcy but civil rehabilitation; the case converted to bankruptcy that April and moved back into civil rehabilitation in November 2017. About 200,000 BTC turned up in an old-format wallet in March 2014, putting the effective loss at roughly 650,000 BTC. Those recovered coins became the source of the creditor repayments that began a decade later.

It was one of the largest hacking incidents in crypto history, and Bitcoin's price fell to less than half its value. "Bitcoin is dead" was pronounced around the world.

The crisis ended up showing how durable the network was. The exchange vanished, but Bitcoin itself never stopped for a moment. The episode fixed the phrase "Not your keys, not your coins" in the crypto vocabulary.

Exchange security standards were rewritten afterward, and cold wallet storage and multi-signature authorization became normal practice.

As use grew, the 1MB limit on block size became a bottleneck, and the community argued fiercely over how to raise throughput.

The fight between the "increase the block size" camp and the "solve it with Layer 2" camp became known as the "Block Size War" and was the most bitter internal dispute in Bitcoin's history.

On August 1, 2017, Bitcoin Cash (BCH) split off in a hard fork that raised the block size to 8MB.

Later that month, on August 24 at block 481,824, Segregated Witness (SegWit) activated on Bitcoin itself: the same month as the fork, but not the same day. By separating signature data, it raised effective capacity and opened the way for second-layer systems such as the Lightning Network.

In December 2017, Bitcoin hit a record of about $20,000, driven in part by the ICO (Initial Coin Offering) boom.

After the 2018 crash, which took the price down to about $3,200, Bitcoin entered a "crypto winter." Infrastructure work continued steadily through it.

In 2020, PayPal began offering Bitcoin trading. The same year, MicroStrategy set a precedent by buying large amounts of Bitcoin as a corporate treasury asset.

In February 2021, Tesla announced a $1.5 billion Bitcoin purchase. That same month, Bitcoin's market cap passed $1 trillion for the first time.

In September 2021, El Salvador made Bitcoin legal tender, the first country to give it that status. It did not last. With an IMF financing agreement in the background, the legal-tender provisions were repealed in January 2025, and accepting Bitcoin went back to being optional for businesses.

In November 2021, Bitcoin reached what was then its all-time high, about $69,000.

In 2022, the collapse of the FTX exchange and the implosion of Terra/Luna hit the industry hard, and Bitcoin fell to about $16,000.

In January 2024, the U.S. Securities and Exchange Commission (SEC) approved spot Bitcoin ETFs. Major asset managers including BlackRock and Fidelity entered the market, and billions of dollars flowed in.

The fourth halving came in April 2024, cutting the mining reward from 6.25 BTC to 3.125 BTC.

The ETFs made Bitcoin much easier for traditional investors to reach. Pension funds, hedge funds, and other institutions have moved in faster since, and as of August 2026 U.S. spot Bitcoin ETFs hold more than 1 million BTC between them (holdings and total assets under management move daily, so check each issuer's disclosures for current figures).

In March 2025, the United States established the Strategic Bitcoin Reserve. The GENIUS Act, which regulates stablecoins, was signed in July 2025 and moved the regulatory framework for crypto forward considerably.

On October 6, 2025, BTC reached an all-time high of $126,198. In November 2025, a $2 billion cascade of derivatives liquidations pushed it below $85,000.

The decline continued into 2026, and BTC was trading in the $60,000s as of mid-August 2026, down about 50% from the ATH. Whether institutional money has permanently broken the four-year halving cycle, or whether a "crypto winter" is simply arriving late, is still argued over.

In March 2026, Tether launched USDT on the Lightning Network through Taproot Assets, a milestone in Bitcoin's second layer becoming usable payment infrastructure.

Total mined BTC reached 20 million, about 95.2% of the cap, in March 2026. More than 17 years after it began, Bitcoin has gone from a cypherpunk experiment to a global financial asset, while its founding aims of decentralization, censorship resistance, and individual financial sovereignty have not changed.