uBTC

u฿ or uBTC are MilliBitcoin. 1 uBTC is equal to 0.000001 Bitcoin "BTC".

Unconfirmed

A state in which a transaction has not been appended to the blockchain.

Unpermissioned Ledger

A public blockchain.

Unspent Transaction Output

An output of a blockchain transaction that has not been spent, and can be used as an input for new transactions.

USDT

See Tether for the meaning of USDT.

UTC Time

Coordinated Universal Time. It is the primary time standard by which the world regulates clocks and time, kept using highly precise atomic clocks combined with the Earth’s rotation.

UXTO

UXTO is the abbreviation of ‘Unspent Transaction Output’. The total balance of bitcoins on an address can be spread over multiple blocks in the blockchain. The unspent bitcoins have a UXTO attribute. By searching the blockchain for the UXTO’s, which belong to a ‘wallet’ address, the total spendable balance can be determined. This is displayed by the wallet when it is fully synchronised.