Blockchain Tokens
A token is a digital asset created on top of an existing blockchain. Anyone with technical skill can launch a token with a smart contract. Tokens can represent money, voting rights, game items, tickets, or ownership of real objects.
Coin Versus Token
A coin runs on its own blockchain. Bitcoin and Ether are coins. A token borrows another chain and follows that chain's rules. Picture a country issuing its own currency. A coin matches that currency, and a token matches a loyalty point that works only inside a single shop.
How a Token Works
A token contract holds a simple ledger. The ledger maps each address to a balance. A transfer subtracts from one balance and adds to another.
Token Contract: "FarmCoin" Address Balance ------------ ------- Asha 120 Ravi 45 Meera 10 Asha sends 20 to Ravi: Asha 120 → 100 Ravi 45 → 65
The contract stores the numbers and the rules. The blockchain protects the contract from tampering.
Token Standards
Standards give developers a shared set of functions. Wallets and apps then recognize any token that follows the standard.
| Standard | Type | Typical Use |
|---|---|---|
| ERC-20 | Fungible: every unit is identical | Payment, governance, and stable value tokens |
| ERC-721 | Non-fungible: every unit is unique | Digital art and collectibles |
| ERC-1155 | Mixed: fungible and unique items together | Game inventories |
Common Token Categories
Utility Tokens
These tokens unlock a service, such as storage space or access to a platform feature.
Governance Tokens
Holders vote on changes to a project or a DAO.
Payment Tokens
Users spend these tokens like digital cash inside an app or community.
Security Tokens
These tokens represent regulated investments such as company shares. Strict laws often apply.
Stablecoins
Stablecoins aim to hold a steady price, usually matched to a national currency.
Supply Terms
| Term | Meaning |
|---|---|
| Total supply | All tokens created so far |
| Circulating supply | Tokens available to the public |
| Max supply | The upper limit, if the contract sets one |
| Minting | Creating new tokens |
| Burning | Destroying tokens permanently |
Approvals
Apps often ask permission to move tokens on your behalf. The permission is called an allowance. A trading app, for example, needs an allowance to swap your tokens. Review each approval carefully. An unlimited allowance given to a malicious contract can let it drain that token from your wallet.
Warning Signs of Scam Tokens
- Promises of guaranteed returns or risk-free gains.
- Anonymous teams with no public history.
- Contracts that let the creator block sales or mint unlimited tokens.
- Pressure to act fast or to share a recovery phrase.
Search the contract address on a block explorer. Read who holds the tokens, how old the contract is, and whether the code is verified. Token content here teaches how the technology works and does not recommend any purchase.
Gas and Tokens
Moving a token on Ethereum costs gas in Ether, not in the token itself. A wallet that holds tokens but no Ether cannot send them. Keep a small amount of the network coin for fees.
Key Takeaways
Tokens live on existing blockchains and follow shared standards. Contracts keep the balances. Many kinds exist, from voting rights to game items. Careful research and cautious approvals protect you from scams.