Release notes

Important

This release is mandatory for all Testnet nodes with the upcoming Fusaka fork.
It includes protocol changes and fixes required to remain in consensus on testnets.

Holesky: 2025-10-01
Sepolia: 2025-10-14
Hoodi: 2025-10-28

Fusaka Testnets Support

Implemented Osaka testnet forks (#9321).
Updated RPC behavior: eth_getBlobsV1 now returns UnsupportedFork post-Osaka (#9341).
Fixed eth_config: ensured ForkInfo is always initialized (#9233).

Stability & Sync Improvements

Fixed snap sync edge cases and hanging on Sepolia (#9166, #9338).
Corrected blockhash handling and rare invalid block cases (#9340).
Improved cancellation handling and graceful shutdown for peers and sync dispatcher (#9173, #9174, #9175).
Fixed concurrent storage root issues and reduced reliance on storage root reads (#9209, #9255).
Ensured consistent receipts handling and transaction processed counters (#9231, #9270).
Fixed issues in Taiko fee handling and default chains config (#9314, #9309).
Fixed missed SELFDESTRUCT between transactions (#9343).

Node Improvements

Reduced log noise from misbehaving peers and improved shutdown logging (#9156, #9177).
Improved logging and config autocompletion (#9159).
CLI now displays default values in help output (#9152).
Improved deposit request validation (#9199).
Enhanced Prometheus metrics in Kute tool (#9077).
Better RPC alignment with Geth (#8951).
Various performance optimizations: bloom filters, Patricia trie, TrieNode navigation, gas estimation (#9191, #9220, #9221, #9195, #9064, #9210).

These changes strengthen node stability, improve operator experience, and ensure readiness for the Fusaka fork on testnets.

What's Changed

Correctly Wrap PrepareRequest exeception by @benaadams in #9144
Only update metrics if not already updating metrics by @benaadams in #9142
fix: BlockReceiptsTracer not forwarding stateRoot to inner tracers by @radik878 in #9129
Make CLI show default values in help output by @Copilot in #9152
Don't serialize UI events when no subscribers by @benaadams in #9150
Fix storage range not retried on wrong order by @asdacap in #9154
Reduce log noise from bad behaving peers by @benaadams in #9156
Don't crash process in debug for Disposal warning messages by @benaadams in #9157
Base mainnet bigger machine by @kamilchodola in #9158
Improve logs and config autocompletion by @flcl42 in #9159
Add a EIP and remove genesis number in superchain.py by @flcl42 in #9143
Add Vector256 nibble conversion by @benaadams in #9153
Use multi-arch vectors for Or and Xor; and expand to 512 bits by @benaadams in #9164
Fix snap sync edge case due to unnecessary proof by @asdacap in #9166
Auto-update fast sync settings by @core-repository-dispatch-app[bot] in #9147
Use single event subscription for NewPayload by @benaadams in #9107
Always output logs for processed blocks by @benaadams in #9170
Handle Cancellation in SyncPeerPool.Allocate by @benaadams in #9173
Extra validation in case IForwardHeaderProvider skip header. by @asdacap in #9171
Cancel sync dispatcher loop on cancellation by @benaadams in #9174
Handle peers shutdown more gracefully by @benaadams in #9175
Remove unsupported Rlpx channel option by @benaadams in #9172
More graceful shutdown logs by @benaadams in #9177
Support OP Isthmus at the Genesis block by @emlautarom1 in #9163
Explicitly pass parent header in header validator by @asdacap in #9168
Cleanup/remove MaybeParent. by @asdacap in #9169
Update OP Superchain chains by @core-repository-dispatch-app[bot] in #9148
Align/refactor RPC output with geth by @ak88 in #8951
Optimize Blooms by @benaadams in #9191
Auto-update fast sync settings by @core-repository-dispatch-app[bot] in #9193
Update OP Superchain chains by @core-repository-dispatch-app[bot] in #9194
Per contract state by @asdacap in #9088
Use genesis as the parent for the first block by @flcl42 in #9203
Improve deposit request fields validation by @flcl42 in #9199
Refactor/move main blockprocessing to di by @asdacap in #9130
Start XDC project by @ak88 in #9206
Optimize TrieNode.SeekChild by @benaadams in #9195
Fix concurrent storage root issue by @asdacap in #9209
Incorrect Gas Estimation by @svlachakis in #9064
GasEstimator refactor post #9064 by @LukaszRozmej in #9210
Added basic spec classes by @ak88 in #9212
Await db blocks sync inside ReviewBlockTree by @deffrian in #9196
Remove hardcoded AuRa release spec decorator to plugin module by @asdacap in #9167
Auto-update fast sync settings by @core-repository-dispatch-app[bot] in #9217
Update OP Superchain chains by @core-repository-dispatch-app[bot] in #9218
Precompiles Extensibility through IReleaseSpec by @svlachakis in #9222
feat: improve kute tool prometheus metrics by @cbermudez97 in #9077
Hive to load blocks before RPC start by @flcl42 in #9224
Refactor/move blocktree to di by @asdacap in #9230
Admin Get Peers by @svlachakis in #9003
Fix receipts deletion by @Marchhill in #9231
ENR Support on admin_peers by @svlachakis in #9228
Ensure ForkInfo is initialized by @flcl42 in #9233
feat(block-validator): add debug logging message for MaxRlpBlockSize by @0xMushow in #9236
Implement Xdc Header Decoder by @cicr99 in #9214
Remove unused references for XDC by @ak88 in #9237
Corrected sealing encoding XDC by @ak88 in #9238
Removed xdc ref in core by @ak88 in #9242
XDC : add extra needed types by @Demuirgos in #9219
implement eth_getAccountInfo by @smartprogrammer93 in #9241
Added filename in accumulator.txt and checksums.txt by @ndatta-nethermind in #9211
Cleanup/remove nodecommit info by @asdacap in #9155
Fix Nethermind UI when the app is run from non-app directory by @wurdum in #9248
Fix simulate gas by @deffrian in #9244
Cleanup/remove unnecessary method by @asdacap in #9249
Tests for #9244 by @deffrian in #9250
Perf/Patricia set by @asdacap in #9220
Perf/Update Patricia.Get by @asdacap in #9221
Auto-update fast sync settings by @core-repository-dispatch-app[bot] in #9252
Update OP Superchain chains by @core-repository-dispatch-app[bot] in #9253
Bump up the version to 1.34.0-unstable by @core-repository-dispatch-app[bot] in #9124
Feature/arbitrum setup sync by @damian-orzechowski in #9232
Reduce use of storage root slightly by @asdacap in #9255
Clear storage cell / trie without reading cell's value first fails by @damian-orzechowski in #9239
fix inconsistent merge plugin test by @asdacap in #9258
Required decoders for XDC by @ak88 in #9257
Perf/PatriciaTree bulk set by @asdacap in #9215
Refactor/Use genesis loader in test by @asdacap in #9259
Cleanup/move TransactionProcessed event to IMainProcessingContext by @asdacap in #9271
Fix transaction processed counter not working by @asdacap in #9270
Use extension method in some ITransactionProcessor interface method. by @asdacap in #9272
Remove from GitHub Actions energyweb and volta chains sync by @stdevMac in #9256
Genesis extensibility by @svlachakis in #9282
Enable passing args to Nethermind when using sync chains pipeline by @flcl42 in #9184
Update OP Superchain chains by @core-repository-dispatch-app[bot] in #9284
Auto-update fast sync settings by @core-repository-dispatch-app[bot] in #9283
Select proper block by @flcl42 in #9289
Fix selfdestruct missed between transaction by @asdacap in #9343
Fix Issues in Taiko Fee Handling by @dipkakwani in #9314
Fix Taiko Chains Default Config by @dipkakwani #9309
Make eth_getBlobsV1 return UnsupportedFork post Osaka by @LukaszRozmej in #9341
Fix blockhash related random invalid block by @asdacap in #9340
Fix MCL memory leak by @rubo in #9336
Fix hanging sepolia snap sync by @asdacap in #9338
Osaka testnet forks by @Marchhill in #9321

New Contributors

@radik878 made their first contribution in #9129
@0xMushow made their first contribution in #9236
@ndatta-nethermind made their first contribution in #9211

Full Changelog: 1.33.1...1.34.0

NethermindEth/nethermind 1.34.0 v1.34.0 on GitHub