Mainnet

Mainnet is the live, production version of a blockchain — the network where transactions move real value, as opposed to testnets where tokens are worthless stand-ins for experimentation. When people say a coin's price, a protocol's usage, or a wallet balance, they mean mainnet; it is the chain of record whose history the community treats as economically meaningful.

The term appears most prominently in "mainnet launch," the milestone when a project graduates from testing to production. Many projects sell tokens or run testnets long before a functioning mainnet exists, so the launch is the moment the technology must actually work under real economic pressure. For example, Ethereum's mainnet went live in July 2015 after earlier proof-of-concept networks, and newer chains typically progress through devnets and incentivized testnets before their mainnet genesis block. Established networks also use the word for upgrades: a feature "ships to mainnet" after being rehearsed on testnets, as Ethereum's Merge did in September 2022.

A common misconception is that mainnet and testnet tokens are interchangeable or connected; they are entirely separate ledgers, and testnet coins can never be moved to mainnet — a fact scammers exploit by "paying" victims in worthless testnet tokens that look real in an explorer. Practical care follows from the distinction: wallet software lets you switch networks, and sending mainnet assets to an address on the wrong network, or trusting a transaction that actually occurred on a testnet, are classic beginner mistakes worth double-checking against the network name shown in your wallet.