What is USDT and how does it work?

CrabChain.org Team | Updated 13 October 2026

USDT, commonly known as Tether or Tether USD, is a stablecoin designed to maintain a value close to the U.S. dollar and operate on blockchain networks. Its purpose is to combine a unit of account associated with the dollar with the operational properties of digital assets, so that it can be sent between blockchain addresses, used on trading platforms, and integrated into financial applications based on smart contracts. Tether was launched in 2014 and became one of the first projects aimed at representing fiat currencies through tokens transferable on blockchain networks.

The essential feature of USDT is its link to the dollar. Tether states that each unit in circulation is backed by reserves whose value equals or exceeds the obligations associated with the issued tokens and that the economic reference of USD₮ is one U.S. dollar per token. This statement should be distinguished from a legal or physical equivalence between one USDT and a one-dollar banknote. USDT is a digital asset issued by a private entity, while the U.S. dollar is a sovereign currency backed by the monetary and financial system of the United States. The relationship between them depends on the reserve structure, issuance and redemption mechanisms, market liquidity, and participants' confidence.

Issuance and redemption

To understand how USDT works, it is necessary to look at what happens when new tokens are created. Tether states that new tokens may be authorized using several private keys held by the issuing entity, and then recorded on the corresponding blockchain. At an initial stage, these tokens may remain in Tether's treasury as authorized units that have not yet been issued. They do not become part of effective circulation until they are transferred out of that treasury, for example to a customer who has acquired them. This distinction explains why the total number of tokens technically created on certain networks may not match the amount that the market considers to be in circulation.

The reverse process occurs when tokens are redeemed. In simplified terms, a user who meets Tether's requirements can deliver USDT to the issuer and receive the corresponding fiat currency. Redeemed tokens cease to count as units in circulation and may temporarily remain in inventory or be destroyed. Tether may also issue new tokens to meet later demand. This creation-and-removal mechanism is relevant because it introduces a relationship between the supply of USDT and the obligations of the issuing entity, although activity taking place on secondary cryptocurrency markets works differently from the direct issuance process.

The difference between the secondary market and direct redemption is fundamental. The price of USDT on an exchange is determined by buyers and sellers and may temporarily trade above or below one dollar. The existence of such a fluctuation does not necessarily mean that the backing mechanism has stopped functioning. Tether maintains that its redemption capacity for verified customers is one of the main mechanisms supporting the peg. On secondary markets, traders can also exploit price differences between platforms, and through arbitrage they may help reduce deviations when sufficient liquidity and conversion channels exist.

The reserves

USDT's financial operation therefore depends on its reserves. Tether states that these include cash, cash equivalents, and other assets and that it publishes information about their composition. The company also says that it provides information about token circulation daily and publishes quarterly reserve reports prepared by BDO Italia. It is important, however, to understand what this type of documentation means. Tether expressly explains that its reserve reports are not complete financial statements but selected financial information extracted from accounting records. Therefore, analyzing USDT requires distinguishing among statements made by the issuer, published information, and the specific scope of the independent assurance accompanying those reports.

The composition of the reserves has direct consequences for the stablecoin's risk profile. Rather than imagining a safe containing only banknotes equivalent to every USDT in existence, the model should be understood as a diversified financial structure whose stated purpose is to cover obligations related to the tokens. Tether has explained in different communications that its reserves may include liquid assets and other financial instruments, in addition to assets such as bitcoin and gold. The nature, valuation, and liquidity of those assets matter because the ability to respond to large redemption requests depends not only on the accounting value of reserves, but also on how easily they can be converted into liquid resources when necessary.

Several blockchains

Another decisive element is that USDT does not exist on a single blockchain. The same asset is available through different infrastructures and formats, including Ethereum, Tron, Solana, TON, Aptos, and other networks compatible with Tether-supported protocols. In each case, transactions are recorded by the blockchain being used. The existence of multiple networks increases integration possibilities and allows USDT to participate in technological ecosystems with different characteristics, but it also introduces an important operational consideration. Sending USDT over a network that is not compatible with the destination address can create recovery problems or even result in loss of access to the funds.

The multichain architecture also explains why simply saying that someone owns USDT can be insufficient from a technical perspective. Two users can hold the same dollar-denominated stablecoin but keep it on different networks. The asset represents the same economic reference, while the technical mechanism for transferring it depends on the protocol used. Moving assets between networks may require specific infrastructure operations and should not necessarily be confused with an independent creation of value. This separation between the asset and the network that transports it is one of the features that distinguishes USDT from a traditional bank account.

What USDT is used for

Its use has spread far beyond simple cryptocurrency trading. USDT functions as a settlement unit on exchanges, an instrument for moving liquidity between markets, and an asset integrated into numerous payment-related services and decentralized financial applications. By maintaining a relatively stable reference to the dollar, it allows users to temporarily reduce their exposure to the volatility of assets such as Bitcoin or Ether without necessarily leaving the blockchain environment. It can also facilitate international movements of value when the parties accept USDT and have access to the infrastructure needed to convert it later into fiat currency.

This utility also explains why USDT occupies a strategic position in digital-asset markets. A large share of trading activity can be expressed in terms of USDT instead of bank dollars. This facilitates interoperability between platforms operating in different jurisdictions and makes it possible to keep liquidity within open networks around the clock. However, ease of transfer does not eliminate the associated risks. A user still depends on the security of the blockchain being used, the custody of their keys, available liquidity, and the conditions of the platform used to buy, sell, or convert the tokens.

Centralization and regulation

The centralization of issuance is another fundamental difference from cryptocurrencies such as Bitcoin. Although USDT transfers are recorded on public networks and can be verified using each blockchain's tools, the creation and redemption of tokens depend on the issuing entity. Tether controls the keys needed to authorize issuance and establishes the conditions under which certain customers may directly access its services. This means that USDT combines a blockchain-based transfer infrastructure with a centralized issuance structure.

That combination has regulatory and economic consequences. USDT's operation depends on a specific company, the institutions where it keeps its reserves, and the legal framework applicable to its activities. There is also counterparty risk that does not arise in the same way in a purely decentralized asset. At the same time, centralization allows Tether to manage supply, handle issuance and redemption processes, and apply compliance procedures such as know-your-customer and anti-money-laundering measures required for relevant services.

For all these reasons, USDT should be understood as something more complex than a simple digital dollar. It is a token issued by a centralized entity, designed to maintain a value reference to the dollar, backed according to Tether by a portfolio of reserves, and deployed across multiple blockchain networks. Its stability does not come from a mathematical property that forces the market to value every unit at exactly one dollar. Instead, it results from the interaction of reserves, redemption capacity, liquidity, arbitrage, and confidence.

USDT's relevance within the crypto ecosystem lies precisely in this combination of a familiar monetary reference and an open technological infrastructure. For users, it represents a way to hold and transfer dollar-denominated value across digital networks. For the financial sector, it is an example of how a private company can use blockchain technology to create a digital monetary unit with global reach. And for analysts, its operation raises an essential question that applies to all reserve-backed stablecoins. The promised stability ultimately depends on the quality of the backing, the available transparency, and the system's effective ability to respond when a significant share of users decides to recover the value represented by those tokens.

Sources

• Transparency — Tether
• Regulation (EU) 2023/1114 on markets in crypto-assets (MiCA) — EUR-Lex