Unspent Transaction Output (UTXO)
An unspent transaction output, or UTXO, is a piece of cryptocurrency value created by a transaction output that has not yet been…
Glossary terms starting with U
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Unsupported Asset Payment
An unsupported asset payment occurs when a payer sends a cryptocurrency or token that the receiving merchant, invoice, address, or processor is…
Unsupported Network Payment
An unsupported network payment is a cryptocurrency transfer made on a blockchain that the merchant or payment provider does not support for…
Unsupported Token Payment
An unsupported token payment is a transfer of a blockchain token that the merchant or payment provider has not approved for the…
Unsupported-Address Payment
An unsupported-address payment is a transfer sent to an address that the merchant or payment system does not recognize as a valid…
Unvested Token Supply
Unvested Token Supply is the amount of an allocated token supply for which beneficiaries have not yet earned an unconditional right under…
Upgradeability Risk
Upgradeability risk is the possibility that a change mechanism alters software or smart-contract behavior in a harmful, unauthorized, incompatible, or unexpected way.…
Upgradeable Token
An upgradeable token is a token whose code, behavior, parameters, or administrative modules can be changed after deployment without replacing every holder…
Usage-Based Billing
Usage-based billing calculates customer charges from measured consumption of a product or service rather than only a fixed recurring price.
USD Coin (USDC)
USD Coin (USDC) is a dollar-targeted stablecoin issued by Circle entities and used for digital payments, transfers and liquidity management. Circle publishes…
Usual Governance Token (USUAL)
Usual Governance Token (USUAL) is the governance and ownership token of the Usual Protocol. Official protocol documentation describes USUAL as the asset…
Utility Token
A utility token is a digital token designed to provide access, functionality, discounts, resources, services, rewards, or participation inside a network or…
UTXO Age Distribution
UTXO age distribution describes how long the currently unspent outputs in a UTXO-based blockchain have remained unspent. Analysts group UTXOs by the…
UTXO Bloat
UTXO bloat is the excessive growth of a blockchain’s active set of unspent transaction outputs. It occurs when users create many small…
UTXO Consolidation
UTXO consolidation combines several small, spendable Bitcoin outputs into fewer outputs controlled by the same wallet. It aims to reduce the number…
UTXO Dust
UTXO dust describes Bitcoin outputs whose small value makes them uneconomical or unevaluable under certain network relay policies relative to the cost…
UTXO Fragmentation
UTXO fragmentation is the condition in which a wallet’s total value is divided across many small unspent outputs instead of a manageable…
UTXO Management
UTXO management is the set of wallet and treasury practices used to select, label, consolidate, preserve, and spend unspent transaction outputs. It…
UTXO Model
The UTXO model is a blockchain accounting design in which transactions consume existing unspent outputs and create new outputs instead of directly…
UTXO Set
The UTXO set is the complete collection of unspent transaction outputs recognized by a UTXO-based blockchain at a particular block. It represents…
UTXO Snapshot
A UTXO snapshot is a serialized copy or commitment of the unspent transaction output set at a specific block. It lets a…