Mainnet is the live production version of a blockchain network where real assets and real transactions exist.
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Short definition
Mainnet is mainnet is the live production version of a blockchain network where real assets and real transactions exist.
Simple explanation
Mainnet transactions can have financial consequences and are usually not reversible.
Why it matters
Users must confirm they are on the correct mainnet before sending funds, bridging, swapping, or adding tokens.
Example context
Ethereum mainnet and Solana mainnet are live production blockchain networks.