A definite function's ability to provide results that pass statistical tests for randomness is referred to as pseudorandom.
Bitcoin Halving
A blockchain event known as a "halvening" (or "Bitcoin halving") causes block subsidies or rewards for validating transactions to be reduced by half.
Candidate Block
In a few words, a candidate block is a block that a mining node (miner) is trying to mine in order to receive the block reward. So a candidate block may be described as a temporary block that will be either validated or discarded by the network. Miners compete with each other to validate the next block and add it to the blockchain, but first, they have to create a candidate block to participate in the mining competition.
Pair
Exchange cryptocurrencies with each other, like the trading pair BTC/ETH.