Bera-Reth v1.4.3

Important

We released v1.4.4, you should use that instead of v1.4.3 release.

Summary

This is a mainnet-ready release for the Osaka1 EL hard fork. It also reverts the txpool minimum-tip enforcement from v1.4.2 (#275), which the consensus floors supersede.

Osaka1 enforces a minimum base fee and a minimum blob base fee network-wide. The floors replace the per-validator minimum priority-fee mitigation deployed during the recent spam attack as they apply regardless of validator configuration and the fees are burned instead of paid to the proposer. Both values are required in the genesis config and must be non-zero, Osaka1 must activate at or after Osaka, and any misconfiguration fails at startup instead of silently disabling a floor.

Mainnet activation

Activation time	1785945600 (August 5, 2026 at 16:00:00 UTC)
minimumBaseFeeWei	1000000000 (1 gwei)
minimumBlobBaseFeeWei	1000000000 (1 gwei)

This is a mandatory upgrade for all mainnet nodes before August 5. Nodes on older versions will silently ignore the fork (older binaries do not know the osaka1 genesis field) and stop following the chain at activation.

Upgrading

• Nodes using the built-in mainnet preset need nothing beyond this binary. That covers both --chain mainnet and omitting --chain entirely, since mainnet is the default. The fork schedule is baked into the release.
• Nodes passing an explicit genesis file must also refresh it. The eth-genesis.json was updated in berachain/beacon-kit#3152 and is downloadable directly (~47 MB) from https://raw.githubusercontent.com/berachain/beacon-kit/2059e2abea2a42513a0617a38cd7f758d1a1e6a1/testing/networks/80094/eth-genesis.json

No beacon-kit upgrade is required, Osaka1 is EL-only.

Verify the fork is loaded by checking the startup log for:

Berachain Osaka1 configuration: {time=1785945600, min_base_fee_wei=1000000000, min_blob_base_fee_wei=1000000000}

Update Priority

This table provides priorities for which classes of users should update particular components.

User Class	Priority
Payload Builders	Required
Non-Payload Builders	Required

All Changes

• chore(forks): set osaka1 mainnet activation time (#278)
• chore: set bera-reth version to 1.4.3 (#276)
• fix(txpool): revert enforcement of min effective tip on all txs (#275)
• feat: osaka1 fork to floor the base fee and blob fee (#268)
• fix(ci): pin tx-sender fees above 1 gwei min tip (#273)
• chore(deps): fix cargo deny advisories (#274)

Binaries

The binaries are signed with the PGP key: 9B79 D302 7909 D094 3EFD DA8A A8A8 EF9C 940F AD3A

Bera-Reth

System	Architecture	Binary	PGP Signature
	x86_64	bera-reth-v1.4.3-x86_64-unknown-linux-gnu.tar.gz	PGP Signature
	aarch64	bera-reth-v1.4.3-aarch64-unknown-linux-gnu.tar.gz	PGP Signature
	aarch64	bera-reth-v1.4.3-aarch64-apple-darwin.tar.gz	PGP Signature
	Docker	berachain/bera-reth	-