What is Token?

A token is a unit of value or ownership that lives inside a smart contract on a blockchain rather than in the chain itself. Ether is the native asset of Ethereum; USDC on Ethereum is a token, a balance sheet kept by a contract that follows a standard interface so wallets and exchanges can handle it the same way. The standard is what makes tokens interoperable: ERC-20 on Ethereum and its lookalikes, SPL on Solana, jettons on TON, TRC-20 on Tron.

Tokens come in a few families. Fungible tokens are interchangeable units: stablecoins, governance tokens, wrapped versions of other assets, memecoins. Non-fungible tokens are unique items with their own identifier. Liquidity-pool shares, staked receipts and lending deposits are tokens too, which is why a wallet full of DeFi positions looks, at the raw level, like a wallet full of oddly named coins.

Anyone can create a token, and that cuts both ways. It is why a new project can launch in an afternoon, and why every active wallet accumulates airdropped junk and outright scam tokens sent to it unasked. A token with a name and a price is not the same as a token with a market: the price of an illiquid or fake token is whatever a single trade last printed.

For tracking, the work is in valuation and filtering. A tracker has to resolve each token contract to a real asset, price it from venues with real liquidity, and hide the dust and spam that would otherwise inflate a total. TrueHold prices tokens against exchange tickers, treats stablecoins at one dollar, and filters spam and dust below a threshold you set, so the portfolio total reflects what you could actually sell.

A token's real identity is its contract address, not its ticker. Dozens of tokens can share a name, and scam tokens copy popular tickers on purpose, so wallets, explorers and trackers resolve tokens by address and treat the symbol as a label. When two things called USDC show up in a wallet, one of them is usually a bridged version and the other is often nothing at all; the address tells them apart.