EIP-7607: Hardfork Meta - Fusaka

EIPs included in the Fulu/Osaka Ethereum network upgrade.

In simple terms

What does EIP-7607 do?

EIP-7607 is the Meta EIP tracking all proposals for the Fusaka (Fulu/Osaka) network upgrade. It lists EIPs as Proposed, Considered, Scheduled, or Declined for inclusion, along with activation parameters for testnets and mainnet once decided.

Why is it important?

Meta EIPs provide a single source of truth for what's included in each network upgrade. Developers, node operators, and the community can track Fusaka's progress in one place, seeing which proposals made the cut, which were declined, and when activation will occur.

Metadata

Status: FinalMetaCreated: 2024-02-01

Authors

Tim Beiko (@timbeiko), Alex Stokes (@ralexstokes), Ansgar Dietrichs (@adietrichs)

Requires

EIP-7594, EIP-7600, EIP-7642, EIP-7823, EIP-7825, EIP-7883, EIP-7892, EIP-7910, EIP-7917, EIP-7918, EIP-7934, EIP-7935, EIP-7939, EIP-7951

Links

GitHub page Discussion on Ethereum Magicians

Abstract

This Meta EIP lists the EIPs included in the Fulu/Osaka network upgrade. It follows the Pectra upgrade, documented in EIP-7600.

Specification

Included EIPs

Core EIPs

EIP-7594: PeerDAS - Peer Data Availability Sampling
EIP-7823: Set upper bounds for MODEXP
EIP-7825: Transaction Gas Limit Cap
EIP-7883: ModExp Gas Cost Increase
EIP-7917: Deterministic proposer lookahead
EIP-7918: Blob base fee bounded by execution cost
EIP-7934: RLP Execution Block Size Limit
EIP-7939: Count leading zeros (CLZ) opcode
EIP-7951: Precompile for secp256r1 Curve Support

Other EIPs

EIP-7892: Blob Parameter Only Hardforks
EIP-7642: eth/69 - Drop pre-merge fields
- Client teams MUST support this EIP by the activation of the Fusaka network upgrade.
EIP-7910: eth_config JSON-RPC Method
- Client teams MUST support this JSON-RPC method by the activation of Fusaka network upgrade.
EIP-7935: Set default gas limit to 60M

Activation

Network Name	Activation Epoch	Activation Timestamp	Activation Time (UTC)	Fork ID
Holešky	`165120`	`1759308480`	2025-10-01 08:48:00	`0x783def52`
Sepolia	`272640`	`1760427360`	2025-10-14 07:36:00	`0xe2ae4999`
Hoodi	`50688`	`1761677592`	2025-10-28 18:53:12	`0xe7e0e7ff`
Mainnet	`411392`	`1764798551`	2025-12-03 21:49:11	`0x5167e2a6`

Blob Parameter Only Forks

Blob Parameter Only (BPO) forks, defined in EIP-7892, are scheduled alongside Fusaka to raise blob capacity without additional protocol changes.

BPO 1

Network Name	Activation Epoch	Activation Timestamp	Activation Time (UTC)	Fork ID
Holešky	`166400`	`1759800000`	2025-10-07 01:20:00	`0xa280a45c`
Sepolia	`274176`	`1761017184`	2025-10-21 03:26:24	`0x56078a1e`
Hoodi	`52480`	`1762365720`	2025-11-05 18:02:00	`0x3893353e`
Mainnet	`412672`	`1765290071`	2025-12-09 14:21:11	`0xcba2a1c0`

BPO 2

Network Name	Activation Epoch	Activation Timestamp	Activation Time (UTC)	Fork ID
Holešky	`167936`	`1760389824`	2025-10-13 21:10:24	`0x9bc6cb31`
Sepolia	`275712`	`1761607008`	2025-10-27 23:16:48	`0x268956b6`
Hoodi	`54016`	`1762955544`	2025-11-12 13:52:24	`0x23aa1351`
Mainnet	`419072`	`1767747671`	2026-01-07 01:01:11	`0x07c9462e`

Rationale

This Meta EIP provides a global view of all changes included in the Fusaka network upgrade, as well as links to full specification.

Security Considerations

None.