A coin is a digital currency that runs on its blockchain. The rule is straightforward—if a crypto asset has its own blockchain, it is a coin. If it doesn’t, it falls into a different category, usually called a token.
A blockchain is a shared digital record book that no single person, company, or bank owns or controls. Copies of it sit on thousands of computers worldwide, making it impossible for anyone to manipulate. Bitcoin has its blockchain, so it’s a coin. Ether lives on the Ethereum blockchain, which Ethereum built and maintains itself, so it’s a coin as well. The two are tied together permanently—a coin without its blockchain is nothing.
A useful way to picture the situation is by considering countries and their currencies. America has the dollar. Japan has the yen. Each country issues money that belongs to its system. Crypto coins work the same way—each blockchain has one native coin that belongs to it alone.
Coins do more than exist; they serve specific purposes. You can send them to anyone, anywhere, without a bank handling the transfer. Many people hold them as a way to store value over time—Bitcoin, for instance, has a hard cap of 21 million coins baked into its code, so no more will ever be made. Scarcity, as with most things, tends to matter. Some coins also work as fuel—ETH is spent every time someone does anything on the Ethereum network, whether that’s sending money or running an application.
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Coins come into existence through two main processes. Mining is where computers do heavy computational work and receive newly created coins as payment. Staking is where people lock up coins they already own to help keep the network running and earn more coins in return.
What often surprises people is that coins are also the entry point to the broader crypto world. To buy a token, use a crypto application, or participate in anything blockchain-related, you almost always need coins first. Coins serve as a means of payment, a medium of exchange, and the ultimate benchmark for pricing the entire system. In this sense, coins aren’t just one part of crypto—they are the foundation everything else is built on top of.