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What does mainnet launch mean in crypto?

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Quick answer

A mainnet launch is when a blockchain project starts its production network. This usually means creating a genesis block, and from that point transactions carry real value. Some projects that first issued tokens on another chain, such as EOS with ERC-20 tokens on Ethereum, asked holders to swap or register before launch. A mainnet launch is a technical milestone. It does not show that a project is secure or financially sound.

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Answer

Bitcoin's genesis block is dated 3 January 2009 [8], and Ethereum's Frontier mainnet went live on 30 July 2015 [9]. Before the EOS mainnet launch in June 2018, holders were warned that ERC-20 EOS tokens not swapped would be frozen .

Sources

  1. academicBlockchain Technology Overview (NISTIR 8202) — National Institute of Standards and Technology (via arXiv) · accessed Nov 10, 2026 · Evidence page
  2. officialNetworks — ethereum.org · accessed Nov 10, 2026 · Evidence page
  3. officialHolesky and Hoodi Testnet Updates — Ethereum Foundation Blog · accessed Nov 11, 2026 · Evidence page
  4. officialPectra Mainnet Announcement — Ethereum Foundation Blog · accessed Nov 10, 2026 · Evidence page
  5. officialHolešky Testnet Shutdown Announcement — Ethereum Foundation Blog · accessed Nov 11, 2026 · Evidence page
  6. officialSolana Clusters — Solana Foundation · accessed Oct 31, 2026 · Evidence page
  7. officialUsing a test network — Bitcoin Core Onboarding · accessed Nov 11, 2026 · Evidence page
  8. officialGenesis block — Bitcoin Wiki · accessed Nov 11, 2026 · Evidence page
  9. newsEthereum Launches Long-Awaited Decentralized App Network — CoinDesk · accessed Oct 31, 2026 · Evidence page
  10. officialEIP-155: Simple replay attack protection — Ethereum Improvement Proposals · accessed Nov 11, 2026 · Evidence page
  11. officialThe Merge — ethereum.org · accessed Nov 10, 2026 · Evidence page
  12. officialTaproot — Bitcoin Optech · accessed Nov 11, 2026 · Evidence page