# Release Bioelectric Infusers (v1.16.4) · ethereum/go-ethereum

Source: https://github.com/ethereum/go-ethereum/releases/tag/v1.16.4
Kiwi News: https://news.kiwistand.com/stories/Release-Bioelectric-Infusers-v1164-ethereumgo-ethereum?index=0x68dc1dd0605acf193228597d16c8aecb617d556686c5e16b7e1983194aff0f055f872c12
Submitted by misha on 2025-09-30 UTC, 3 upvotes, 0 comments

## Summary

Geth v1.16.4 enables the Osaka (Fusaka) fork on the Holesky, Sepolia and Hoodi testnets, along with two blob-parameter-only (BPO) forks on each. Osaka activates on Holesky on 2025-10-01, on Sepolia on 2025-10-14 and on Hoodi on 2025-10-28, with BPO1 and BPO2 following on each network. BPO1 raises blob capacity to a maximum of 15 blobs per block with a target of 10, and BPO2 raises it to a maximum of 21 with a target of 14. The release also sets the default block gas limit to 60M gas, which the article describes as the limit its client authors are comfortable with.

## Article

This release enables the Osaka (Fusaka) fork on testnets. We also enable two blob-parameter only (BPO) forks for the testnets.

Holesky

Osaka at time 1759308480 (2025-10-01 08:48:00 UTC)

BPO1 at time 1759800000 (2025-10-07 01:20:00 UTC)

BPO2 at time 1760389824 (2025-10-13 21:10:24 UTC)

Sepolia

Osaka at time 1760427360 (2025-10-14 07:36:00 UTC)

BPO1 at time 1761017184 (2025-10-21 03:26:24 UTC)

BPO2 at time 1761607008 (2025-10-27 23:16:48 UTC)

Hoodi

Osaka at time 1761677592 (2025-10-28 18:53:12 UTC)

BPO1 at time 1762365720 (2025-11-05 18:02:00 UTC)

BPO2 at time 1762955544 (2025-11-12 13:52:24 UTC)

With BPO1 and BPO2, the blob capacity of these networks will increase as follows:

BPO1: max blobs/block: 15, target: 10

BPO2: max blobs/block: 21, target: 14

As of this release, the default block gas limit is set to 60M gas. This is the recommended limit that we, as client authors, feel comfortable with.

CLI commands

geth snapshot and related commands no longer fail due to not finding the trie journal file. (#32531)

A regression in geth snapshot dump and geth export-preimages is resolved. (#32650)

We have added an experimental zkVM 'guest program', keeper, to the source tree. (#32543, #32638, #32736)

RPC

eth_call and related operations were fixed to not apply the EIP-7825 per-transaction gas limit when executing under Osaka fork rules. (#32641)

For eth_getLogs and other log filtering operations, it is now possible to configure the number of addresses allowed in the filter using the --rpc.logquerylimit flag. (#32327)

Starting Geth with the --state.size-tracking option enables collection of precise state size numbers, which can be read using the debug_stateSize endpoint. (#32362)

The new debug_executionWitness and debug_executionWitnessByHash methods create a block witness for stateless execution. (#32216)

Tracing & ABIGEN

There is a new CodeChangeV2 hook, with a CodeChangeReason parameter. (#32525, #32535)

In certain corner-cases related to SELFDESTRUCT, OnBalanceChange was not invoked. (#32526)

BoundContract in accounts/abi/bind/v2 now exposes an Address method. (#32559)

Core

The EVM MODEXP precompiled account has seen some optimizations to improve performance for worst-case inputs. We are especially grateful for @GottfriedHerold's work on improving the underlying math/big library. (#32527, #32553, #32568, #32576)

The blobpool will now perform a migration to the v1 blob proof format around the time of the fork. (#31966, #32577, #32534, #32656, #32716)

engine_getBlobs has been updated for improved spec compliance and to deal with the conversion of the blob tx proofs. (#32536, #32538, #32578)

The path-based state database has seen some fixes to prevent database corruption, which could sometimes occur when Geth is terminated abnormally, e.g. by a short stop timeout in Docker. (#32557, #32447)

All engine API operations, and eth_config, now support BPO-style forks. (#32589, #32615, #32636, #32579)

This release includes some work towards supporting historical state proofs in the path-based archive node implementation. (#32418, #32523, #32649)

Pebble stall counter are now correctly reported for each opened database. (#32563)

Networking

The node discovery iterator was updated to improved geth startup time and reactivity when the node table becomes empty. (#32517, #32518)

A hang in the 'eth' protocol test suite was resolved. (#32551)

Build

The KZG proof libraries have been updated to the latest release to fix a vulnerability. Fortunately, the vulnerability would only have become usable after the Osaka fork, so there is no risk for users of current versions. (#32640, #32639)

go-ethereum now requires Go 1.24 or later. (#32584, #32598)

This release is built with Go 1.25.1 (#32593)

execution-spec-tests has been bumped to v5.1.0 (#32592, #32742)