v1.34.0

Release notes

Important

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

• Holesky: Wednesday, October 1, 2025 at 8:48:00 AM UTC
• Sepolia: Tuesday, October 14, 2025 at 7:36:00 AM UTC
• Hoodi: Tuesday, October 28, 2025 at 6:53:12 PM UTC

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 and 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