Coin

What Are Coins?
Cryptocurrencies known as coins run on separate blockchains and are unrelated to other coins. Such a cryptocurrency's single unit is also known as a coin. The phrase serves to separate token-based cryptocurrencies like Ethereum (ETH) from autonomous cryptocurrencies like Bitcoin (BTC).
Bitcoin (BTC), which was first released in January 2009, was the first coin available on the cryptocurrency market. It makes sure that no one can create new currencies other than through the computationally costly process of mining by using a decentralized, globally dispersed ledger known as the blockchain to keep track of all transactions that occur on its network.
Following that, a large number of new coins have emerged, some based on their own blockchains created from scratch and others, known as forks, based on the blockchain of another, pre-existing coin. For instance, the blockchains for Bitcoin Cash (BCH) and Bitcoin Gold (BTG), two forks of Bitcoin, were identical at the time of their formation.
Because their blockchains continued to function in total segregation from Bitcoin's after the fork, they are still regarded as coins and distinct cryptocurrencies.
On the other hand, certain platforms, like Ethereum and EOS (EOS), let users create tokens, which are cryptocurrencies whose use is totally dependent on the functionality of the parent platform's blockchain and would cease to exist if that platform ever went down.

Altcoin

Altcoin is the term given to describe alternative digital assets, such as a coin or token that is not Bitcoin. This nomenclature comes from the idea that Bitcoin is the original cryptocurrency and that all others are then considered “alternate” or “alternative” coins.
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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.
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Address

In blockchain, an address refers to a unique alphanumeric identifier associated with a digital wallet or account that is used to send, receive, and store cryptocurrencies or other digital assets.
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