What is testnet
创建于：2025年5月5日
问题
What is testnet
思考
回答
In the crypto world, a testnet (“test network”) is a playground version of a blockchain that:
- Runs the same software and consensus rules as the main network (mainnet)—so it’s realistic for testing smart contracts, wallets, nodes, upgrades, etc.
- Uses special test‑tokens with zero market value, so there’s no financial risk if you break things or spam transactions. You can usually get these tokens for free from a “faucet.”
- Often resets or can be wiped when major protocol changes are introduced, making it easier for devs to start fresh.
- Lets core developers trial protocol upgrades (hard forks, EIPs, BIPs, etc.) before putting them in front of real money.
Why you’d care
- Developers deploy contracts or dApps there first to catch bugs cheaply.
- Node operators can practice configuration and monitoring.
- Power users can rehearse complicated DeFi trades or wallet flows without risking assets.
Well‑known examples
| Mainnet | Common Testnets (as of 2025) | Notes |
|---|---|---|
| Bitcoin | testnet3, signet | Signet is newer, easier to spin up custom test environments. |
| Ethereum | Sepolia, Holesky | Sepolia is the primary lightweight testnet after Goerli wind‑down. |
| Polygon | Mumbai | Mirrors Polygon PoS chain. |
| Solana | Devnet, Testnet | Devnet resets more frequently. |
If you’re thinking of building or experimenting, let me know what chain or toolset you’re using—I can walk you through getting test tokens or setting up a local node.