A coin is a cryptocurrency that operates on its own independent blockchain. This distinguishes it from a "token," which is built on top of another blockchain's infrastructure. Coins are the native currency of their respective blockchains.
Coin vs Token
Coins have their own blockchain: Bitcoin (BTC) on the Bitcoin blockchain, Ether (ETH) on Ethereum, SOL on Solana.
Tokens are built on existing blockchains: USDT, UNI, and LINK are ERC-20 tokens on Ethereum.
Functions of Coins
Transaction Fees: Coins are typically used to pay gas/transaction fees on their native network.
Validator Rewards: Miners or validators are rewarded with the native coin.
Medium of Exchange: Used to transfer value between participants on the network.
Store of Value: Some coins, particularly Bitcoin, serve as long-term stores of value.