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Tether is a cryptocurrency token claimed by its creators to be backed by one dollar for each token issued, though Tether Limited has not issued a promised audit of their currency reserves. Subpoenas from the U.S. Commodity Futures Trading Commission were sent to Tether on December 6, 2017.
Tether was issued on the Bitcoin blockchain through the Omni Layer Protocol. Tether says that each unit of Tether is backed by one United States dollar held in reserve by Tether Limited, and may be redeemed through the Tether Platform. The primary objective is to facilitate transactions between cryptocurrency exchanges with a rate fixed to the United States dollar allowing traders to take advantage of high speed arbitrage opportunities without resorting to slow bank wires. As of February 2018, Tether is ranked around the 15th highest market cap cryptocurrency in the world, with a market cap around $2 billion United States dollars as of 5 February 2018.
Tether tokens are issued by Tether Limited.
The precursor to Tether, originally named "Realcoin", was announced in July 2014 by Realcoin cofounder Brock Pierce as a Santa Monica based startup. Tether CEO Reeve Collins announced the project was being renamed to "Tether" in November 2014. The company's website states that it is incorporated in Hong Kong with offices in Switzerland, without giving details. While representatives from Tether and Bitfinex say that the two are separate, the Paradise Papers leaks in November 2017 named Bitfinex officials Philip Potter and Giancarlo Devasini as responsible for setting up Tether Holdings Limited in the British Virgin Islands in 2014. According to Tether's website, the Hong Kong based Tether Limited is a fully owned subsidiary of Tether Holdings Limited. Bitfinex is the largest Bitcoin exchange by volume in the world.
The Tether model is to hold all United States Dollars in reserve so that it can meet customer withdrawals upon demand.[not in citation given] Tether purports to make reserve account holdings transparent via external audit; however, currently no such audits exist. In January 2018 Tether announced that they no longer had a relationship with their auditor.
About $31 million of USDT tokens were stolen from Tether in November 2017. In response to the theft, Tether suspended trading, and stated it would roll out new software to implement an emergency "hard fork" in order to render untradable all of the tokens that Tether identified as stolen in the heist. Tether has stated that as of 19 December 2017, it has re-enabled limited wallet services and has begun processing the backlog of pending trades.
A blockchain critic has raised questions about the relationship between Bitfinex and Tether,  accusing Bitfinex of creating "magic Tethers out of thin air". In September 2017, Tether published a memorandum from a public accounting firm that they then said showed that tethers were fully backed by US dollars; however, according to the New York Times, independent attorney Lewis Cohen stated the document, because of the careful way it was phrased, does not prove that the Tether coins are backed by dollars". The documents also fail to ascertain whether the balances in question are otherwise encumbered." . The accounting firm specifically stated that
This information is intended solely to assist the management of Tether Limited ... and is not intended to be, and should not be, used or relied upon by any other party.
nothing has drawn more criticism than the operation of Tether, a virtual currency that is supposed to be tied — or tethered — to the value of a dollar. … Tether and Bitfinex have insisted that the two operations are separate. But leaked documents known as the Paradise Papers, which were made public this month, show that Appleby, an offshore law firm, helped Mr. Potter and Mr. Devasini, the Bitfinex operators, set up Tether in the British Virgin Islands in late 2014. One persistent online critic, going by the screen name Bitfinex’ed, has written several very detailed essays on Medium arguing that Bitfinex appears to be creating Tether coins out of thin air and then using them to buy Bitcoin and push the price up.