Crypto Mining Glossary

An uncle block is a valid block in Ethereum that is mined but not included in the main blockchain because another block at the same height has already been added. Unlike orphan blocks in Bitcoin, uncle blocks are accepted by the Ethereum network and reward miners with a smaller incentive.

Undervolting is the practice of reducing the voltage supplied to a mining device's hardware components (such as ASIC chips or GPUs) while maintaining stable performance. In Bitcoin mining, undervolting helps lower power consumption, reduce heat generation, and improve the energy efficiency of the mining rig, ultimately enhancing profitability and extending hardware lifespan.

Uptime in Bitcoin mining refers to the amount of time that mining equipment (such as ASIC miners or GPUs) is operational and actively mining without any interruption. High uptime is critical for maximizing mining revenue, as downtime reduces the number of blocks mined and, therefore, the potential mining rewards. Miners strive for 100% uptime, but factors such as hardware failure, power outages, or network issues can cause periods of inactivity.

A UTXO, or Unspent Transaction Output, is a piece of Bitcoin that has been received in a transaction but has not yet been spent. The Bitcoin network tracks ownership through UTXOs rather than account balances, making them the fundamental building blocks of all Bitcoin transactions.