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Osaka1 is a Berachain execution-layer hardfork that floors the minimum base fee and minimum blob base fee at 1 gwei each after activation.

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Upgrade timing

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What changes

After the fork activates, Bera-Reth enforces configurable floors on the two EIP-1559 fee parameters:
  • Minimum base fee: 1 gwei (1_000_000_000 wei). The next-block base fee can no longer decay below this value.
  • Minimum blob base fee: 1 gwei (1_000_000_000 wei). The EIP-4844 blob base fee is lifted to this floor, shifting the entire exponential curve baseline.
Osaka1 is carried in the built-in --chain bepolia and --chain mainnet presets shipped with Bera-Reth v1.4.4. The Berachain genesis berachain.osaka1 block for Mainnet is:

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Upgrade instructions

  1. Download the recommended versions for your chain.
  2. If you use the built-in chain preset, no genesis file change is needed:
    1. Mainnet
      1. --chain mainnet
    2. Bepolia
      1. --chain bepolia.
  3. If you use --chain <path>, fetch the genesis files for each respective chain:
    1. Mainnet
      1. Mainnet genesis from Beacon Kit main branch and overwrite your current genesis file.
      2. Verify the md5: d367b133f368367c3e973636ad059c79.
    2. Bepolia
      1. Bepolia genesis from Beacon Kit v1.4.2-rc.0 and overwrite your current genesis file.
      2. Verify the md5: f7d31d1039b0253f5f43336e55d28054.
  4. No changes are needed to BeaconKit options.
  5. Start the new beacond and bera-reth binaries.