Cryptocurrency

A cryptocurrency is a digital asset whose ownership is recorded on a blockchain, a shared ledger kept by many independent computers instead of one company. Bitcoin, launched in 2009, was the first to see wide use. The word now covers everything from Bitcoin and Ether to thousands of small tokens that someone created in an afternoon.

You don't actually hold coins in a file or an app. You hold a private key that lets you sign transactions from an address, and the network's miners or validators check that signature before updating the ledger. Native coins such as BTC, ETH, SOL, and BNB pay fees on their own chains. Tokens are made by smart contracts running on top of those chains, though most people call both "crypto" anyway.

This matters because transfers are generally final. There is no support desk to call if you paste the wrong address, sign a malicious approval, or lose your keys. Supply rules and ownership are also written in public code and data, so you can verify a lot yourself instead of trusting a company's word.

Before buying anything, confirm which chain it lives on and copy the exact contract address from a source you trust, because fake tokens often copy real names and tickers. Use a block explorer to see how many wallets hold it and whether a few wallets own most of the supply. Check whether the contract can mint more tokens and whether there is real liquidity to sell into. A token showing up on a list or a leaderboard doesn't mean anyone has vetted it.

Prices swing hard, and small tokens can lose most of their value in hours with no news at all. Many cryptocurrencies have no use beyond trading, so a price can rest on attention alone. Only put in what you can afford to watch fall.