Tether: The 2014 Bitcoin Experiment That Grew From 100 Tokens to $184 Billion

At 16:39 UTC on 6 October 2014, a transaction went into Bitcoin block 324,140 that created a new token called TetherUS. Its description field read "The next paradigm of money." A little over two hours later, in block 324,157, the issuer granted the first 100 of them to an address. Nobody outside a small circle noticed.

That day one bitcoin cost about $330, and the entire Bitcoin market was worth roughly $4.4 billion, according to CoinMarketCap. Twelve years on, the token that started with 100 units is USDT, and on 28 September 2026 Tether's own transparency page showed $183.8 billion of it in circulation. That is about 59% of all dollar stablecoins tracked by DefiLlama, and makes USDT the third-largest crypto asset by market value on CoinGecko, behind only bitcoin and ether. The digital dollar is now worth more than 40 times what the whole Bitcoin market was worth the week it was born.

A dollar IOU written onto Bitcoin

A stablecoin is a digital dollar IOU. The company that issues it says it holds one real dollar, in a bank or in safe investments such as Treasury bills, for every token it has created, and that anyone holding a token can hand it back and get a dollar. The token itself is just an entry on a blockchain, the shared public ledger that records who owns what. It is closer to a money market fund share than to cash: worth a dollar only as long as the issuer's promise holds.

The first Tether tokens did not have a blockchain of their own. They rode on Bitcoin through the Omni Layer, a system then called Mastercoin. Omni works by writing extra information on top of ordinary bitcoin transactions, much like writing a note in the memo line of a cheque. The bank, in this case the Bitcoin network, processes the cheque as normal and ignores the memo. Omni software reads every memo and keeps a second set of books: this address owns 100 TetherUS, that address sent 50 to another.

Mastercoin was the idea of J.R. Willett, a programmer who described it in 2012. In the summer of 2013 he raised about 4,740 bitcoin by selling Mastercoin tokens to the public, a sale now widely called the first initial coin offering, a crowdfunded share issue with no shares. Among its early developers was Craig Sellars.

Three founders and a promise

Sellars was one of three people behind Realcoin, which CoinDesk reported on 9 July 2014. The other two were Brock Pierce, a former child actor turned Bitcoin investor and director of the Bitcoin Foundation, and Reeve Collins, an advertising-technology entrepreneur. Realcoin's pitch was that every coin would be backed one-for-one by US dollars held in "conservative investments", that the reserves would be fully auditable, and that coins could be redeemed at any time. Collins called it "digitizing the dollar". The plans included a US money transmitter licence, deals with banks to use their cash machines, and euro and yen versions.

The timing was not accidental. In February 2014 Mt. Gox, then the best-known Bitcoin exchange, had collapsed after losing about 850,000 bitcoin. Exchanges struggled to keep bank accounts. Selling bitcoin for dollars meant a bank wire that could take days and might be frozen. A trader who wanted to step out of bitcoin for an afternoon had nowhere safe to stand.

Why a digital dollar mattered to Bitcoin

Tether offered that place to stand. A trader could sell bitcoin for USDT, hold something that claimed to be worth exactly one dollar, and buy back in later, all without the money ever touching a bank. Because USDT moved on Bitcoin's own rails, it could be sent between exchanges in minutes, at any hour, the way bitcoin could. In stock-market terms it worked like the cash sweep in a brokerage account, except the cash could be carried from one broker to another in a pocket.

It also gave bitcoin a price tag in the currency the rest of the world uses. A bitcoin/USDT market is, in practice, a bitcoin/dollar market that never closes and needs no bank. USDT went on to become the most traded crypto asset of all: on 28 September 2026 CoinGecko recorded about $71 billion of it changing hands in 24 hours, against about $40 billion of bitcoin.

On 20 November 2014 Realcoin renamed itself Tether. "We're not an altcoin, we're not our own blockchain," Collins told CoinDesk. "We're a service, a token that represents dollars." The company announced three tokens, USTether, EuroTether and YenTether, a revenue model built on small fees for creating tokens, and launch partners: the exchange Bitfinex, Expresscoin, GoCoin and ZenBox.

The Bitfinex connection

Bitfinex turned out to be more than a partner. In September 2014 two Bitfinex executives, Giancarlo Devasini and Phil Potter, set up Tether Holdings Limited in the British Virgin Islands. That overlap was not widely known until the Paradise Papers leak in November 2017 showed the same people running both companies. Collins later said on X that the founders partnered with Bitfinex and "one year later they purchased the company."

Bitfinex enabled USDT deposits and withdrawals on 15 January 2015. When CoinMarketCap began tracking the token on 25 February 2015, $251,600 existed. By the end of 2015 the supply was $951,600. It reached about $10 million at the start of 2017, then exploded: $1.37 billion by 1 January 2018, as the 2017 bull market pulled in traders who wanted dollars on exchanges that banks would not serve.

Bitcoin did not keep the business. USDT launched on Ethereum in November 2017 and on Tron in 2019. When Bitcoin transaction fees spiked, moving USDT over Omni became expensive and slow, and exchanges switched. By May 2020 Ethereum had overtaken Omni as USDT's main home. Tether stopped minting on Omni on 17 August 2023, citing lack of use, and ended Omni redemptions on 1 September 2025.

©CMZ chart. Data: CoinMarketCap, DefiLlama, Tether

The promise of one audited dollar per token also did not hold as advertised. In February 2021 the New York Attorney General, Letitia James, found that Tether had lacked banking access and had not held full reserves at times from 2017; Bitfinex and Tether paid $18.5 million without admitting wrongdoing. In October 2021 the Commodity Futures Trading Commission (CFTC) fined Tether $41 million and Bitfinex $1.5 million, finding USDT was fully backed by fiat on only 27.6% of days in a sample from 2016 to 2018.