ethereum/go-ethereum - Sprouted Seed Vial (v1.16.2)

Published: Aug 4, 2025

Release Summary

Geth v1.16.2, titled "Sprouted Seed Vial", is a maintenance release that introduces implementations for the upcoming Fusaka EIPs, alongside performance optimizations and important bug fixes. While the upgrade is optional, feedback is encouraged.

Fusaka Network Upgrade Preparation

This release contains the client-side implementation for the next Ethereum network upgrade, Fusaka. Key changes include:

EIP-7883: Triples the gas cost for the ModExp precompile post-Cancun.
EIP-7825: Introduces a cap on the gas limit for a single transaction, setting it to 2^24.
EIP-7934: Implements a maximum size limit for the RLP-encoded execution block.
EIP-7939: Adds a new `CLZ` (Count Leading Zeros) EVM opcode with a gas cost of 5.
EIP-7951: Adds a new precompile to support the secp256r1 elliptic curve, enabling more efficient cryptographic operations for technologies like Apple's Secure Enclave.
EIP-7918: Binds the blob base fee to the execution cost, improving the blob fee market.
Additionally, the number of blobs in a single transaction is now limited to a maximum of 6.

Core Improvements and Optimizations

Trie Hashing Memory Usage: Memory allocation during trie hashing has been significantly reduced by optimizing encoding logic and reusing encoders. This change may result in slightly slower overall performance but drastically cuts down on memory usage.
File-based State Journal: Geth can now use a file-based state journal instead of an in-memory one, which is automatically triggered when the journal size exceeds 4 GB.
Freezer Sync Mechanism: The background sync logic for the freezer has been improved to schedule syncs based on both time and the number of uncommitted items, preventing unnecessary disk I/O when the node is idle.
Bug Fixes: This release includes several crucial fixes, including resolving a potential deadlock in the state history indexer, correcting the logic for dropping oversized transaction announcements, and fixing a condition that incorrectly disabled direct ancient sync mode.

RPC API Updates

`eth_getLogs` Validation: The API endpoint will now correctly reject requests that use both `blockHash` and range filters (`fromBlock`/`toBlock`), as these parameters are mutually exclusive.
`debug_traceCall` Fix: A bug was fixed where using block overrides with a future block number would cause the `BLOCKHASH` opcode to return an incorrect value during simulations.
New `debug_sync` Method: A new `debug_sync` RPC method has been introduced to allow for performing a trusted full chain sync on demand.

Other Notable Changes

New metrics have been added to monitor the duration of snap sync and its healing process.
Checkpoints for `blsync` and `filtermaps` have been updated.

Release Notes

<!-- Sprouted Seed Vial (v1.16.2) -->

This is a maintenance release that includes implementations of the Fusaka EIPs, along with 
several new features, optimizations, and bug fixes.  Upgrading to this version is optional, 
but feedback from those who do is greatly appreciated.

### Fusaka:
- Implement EIP-7825 - Transaction Gas Limit Cap. ([#31824](https://github.com/ethereum/go-ethereum/pull/31824),[#32230](https://github.com/ethereum/go-ethereum/pull/32230))
- Implement EIP-7934 - RLP Execution Block Size Limit. ([#31990](https://github.com/ethereum/go-ethereum/pull/31990))
- Implement EIP-7939 - CLZ opcode. ([#31989](https://github.com/ethereum/go-ethereum/pull/31989),[#32172](https://github.com/ethereum/go-ethereum/pull/32172))
- Implement EIP-7918 - Blob base fee bounded by execution cost. ([#31965](https://github.com/ethereum/go-ethereum/pull/31965))
- Implement EIP-7951 - Precompile for secp256r1 Curve Support. ([#31991](https://github.com/ethereum/go-ethereum/pull/31991))
- Implement EIP-7892 - Blob Parameter Only Hardforks. ([#32193](https://github.com/ethereum/go-ethereum/pull/32193))
- Implement EIP-7883 - ModExp Gas Cost Increase. ([#32231](https://github.com/ethereum/go-ethereum/pull/32231))
- Add Block-level accessList structure. ([#31948](https://github.com/ethereum/go-ethereum/pull/31948))
- Limit the max blobs in blob transaction. ([#32246](https://github.com/ethereum/go-ethereum/pull/32246))

### Core:
- Reduce the memory allocation in trie hash function. ([#31902](https://github.com/ethereum/go-ethereum/pull/31902))
- Improve the background sync mechanism of the freezer. ([#32135](https://github.com/ethereum/go-ethereum/pull/32135))
- Introduce file-based state journal. ([#32060](https://github.com/ethereum/go-ethereum/pull/32060))
- Fix the dropping oversized transaction announcements. ([#32210](https://github.com/ethereum/go-ethereum/pull/32210))
- Fix the condition that disables direct ancient sync mode. ([#32188](https://github.com/ethereum/go-ethereum/pull/32188))
- Add an interface for the jump destination analysis cache. ([#32143](https://github.com/ethereum/go-ethereum/pull/32143))
- Fix incorrect address length in historical state reader. ([#32248](https://github.com/ethereum/go-ethereum/pull/32248))
- Fix a dead lock in state history indexer. ([#32260](https://github.com/ethereum/go-ethereum/pull/32260))
- Expose `SigHash` of SetCodeAuthorization for customized signing. ([#32298](https://github.com/ethereum/go-ethereum/pull/32298))

### RPC:

- Reject `eth_getLogs` requests that include both block hash and block range. ([#31877](https://github.com/ethereum/go-ethereum/pull/31877))
- Fix block overrides in `debug_traceCall`. ([#32183](https://github.com/ethereum/go-ethereum/pull/32183))
- Introduce `debug_sync` to perform a trusted full chain sync. ([#32177](https://github.com/ethereum/go-ethereum/pull/32177),[#32149](https://github.com/ethereum/go-ethereum/pull/32149))

### Others:

- Add automatic package aliasing in rlp code generator. ([#31148](https://github.com/ethereum/go-ethereum/pull/31148))
- Add the metrics for tracking snap sync duration. ([#32258](https://github.com/ethereum/go-ethereum/pull/32258))
- Update checkpoints for blsync and filtermaps. ([#32336](https://github.com/ethereum/go-ethereum/pull/32336))
- Add test suite for ENRRequest. ([#32303](https://github.com/ethereum/go-ethereum/pull/32303))

For a full rundown of the changes please consult the Geth 1.16.2 [release milestone](https://github.com/ethereum/go-ethereum/milestone/191?closed=1).

---

As with all our previous releases, you can find the:

- Pre-built binaries for all platforms on our [downloads page](https://geth.ethereum.org/downloads/).
- Docker images published under [`ethereum/client-go`](https://cloud.docker.com/u/ethereum/repository/docker/ethereum/client-go).
- Ubuntu packages in our [Launchpad PPA repository](https://launchpad.net/~ethereum/+archive/ubuntu/ethereum).
- OSX packages in our [Homebrew Tap repository](https://github.com/ethereum/homebrew-ethereum).

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