What is a testnet?
A testnet is a practice version of a cryptocurrency network. Same software, same rules, real protocols, but its own separate blockchain and its own coins, handed out for free and deliberately worth nothing.
On this page
The short version
Every real cryptocurrency (the one with actual value) runs on its mainnet. A testnet is a parallel copy of that network used for practice and development. It runs the same code and follows the same consensus rules, so everything behaves authentically: addresses, transactions, fees, confirmations, mining, nodes, and swaps all work exactly as they do on mainnet.
The difference is the money. Testnet coins are given away for free and have no market value on purpose. That means you can make every beginner mistake (fumble a transaction, misjudge a fee, send to the wrong address) and lose nothing.
Real protocols, fake money. That's what a testnet is.
Why testnets exist
- Developers test wallets, exchanges, and integrations without putting real funds at risk.
- Learners get hands-on with how a blockchain works before spending a cent.
- Protocol changes get trialed on testnet before they are ever activated on mainnet.
If you have ever wanted to understand crypto by doing rather than reading, a testnet is the safest possible sandbox.
Testnet vs mainnet
| Mainnet | Testnet | |
|---|---|---|
| Coin value | Real money | None, by design |
| Getting coins | Buy or earn them | Free from a faucet or by mining |
| Blockchain | The one real chain | A separate chain with its own genesis block |
| Addresses | Mainnet prefixes | Different prefixes, so you can't mix them up |
| Stability | Rock solid | Sometimes reset or erratic, and that's fine |
| Mistakes cost | Real money | Nothing |
The three networks here
TestnetHub focuses on three chains. Each has its own beginner guide:
Bitcoin (tBTC)
The original. Three test networks: testnet3, testnet4, and signet. Bitcoin testnet guide →
Litecoin (tLTC)
Faster blocks, plus MWEB confidential transactions. Litecoin testnet guide →
Monero (tXMR / sXMR)
Private by default, with a testnet and a stagenet. Monero testnet guide →
Testnet, signet, stagenet, regtest
"Testnet" is the general idea, but you'll meet a few specific flavors:
| Network | What it is |
|---|---|
| Public testnet | An open, shared test chain anyone can join (Bitcoin testnet3/testnet4, Litecoin testnet4, Monero testnet). |
| Signet (Bitcoin) | A testnet where blocks are signed by a coordinator, so block production is calm and predictable. Best for app development. |
| Stagenet (Monero) | Technically equivalent to mainnet in features and rules, which makes it the recommended network for integration and exchange-style testing. |
| Regtest | A private, local-only network where you mine blocks on demand. Perfect for automated testing on your own machine. |
Networks at a glance
The usable networks, side by side. The ports and prefixes come in handy once you run a node.
| Network | Coin | Block time | Ports (P2P / RPC) | Address prefix | Good for |
|---|---|---|---|---|---|
| Bitcoin testnet3 | tBTC | ~10 min | 18333 / 18332 | tb1… | Long-running, but erratic |
| Bitcoin testnet4 | tBTC | ~10 min | 48333 / 48332 | tb1… | The current Bitcoin testnet |
| Bitcoin signet | tBTC | ~10 min | 38333 / 38332 | tb1… | Stable app development |
| Litecoin testnet4 | tLTC | ~2.5 min | 19335 / 19332 | tltc1… / tmweb1… | Litecoin, plus MWEB |
| Monero testnet | tXMR | ~2 min | 28080 / 28081 | 9… or A… | Experimental Monero |
| Monero stagenet | sXMR | ~2 min | 38080 / 38081 | 5… | Mainnet-like Monero |
Where to start
The fastest way to learn is to run through the loop once:
Testnet coins are fake money
- They have no market value, so never buy or sell them.
- Never use a real seed phrase or import a real wallet on testnet.
- Never send mainnet BTC, LTC, or XMR to a testnet address.