3.4.0

Key features

Fast restart on ChainTip: no more blocking indexing or prune at startup, Caplin doesn't loose it's downloading progress.
4x smaller Chaindata (~20gb): it improving ChainTip speed. You will get it only by re-sync (or by: ./build/bin/erigon seg step-rebase --datadir=<your_path> --new-step-size=390625)
Historical eth_getProof: is not "experimental" now. We advise +32g ram for this feature. Please re-sync to get latest data-fixes.
New RPC endpoints: trace_rawTransaction, eth_getStorageValues, admin_addTrustedPeer, admin_removeTrustedPeer, call flat tracers, engine_getBlobsV3.
Reduce impact to ChainTip perf: from RPC, from background Files-Merge, from pruning, from optional heavy-flags (--persist.receipts and --prune.include-commitment-history), etc...

Minimum Golang: 1.25

Erigon 3.4 is a drop-in upgrade. No data migration or re-sync is required.

eth_getBlockReceipts: limit over-concurrency — prevents latency growth and OOM at high request rates. (#19725)
eth_feeHistory: performance optimisation and pending block support. (#19526, #19455)
debug_traceCallMany: fix global BlockOverrides and StateOverrides not being applied. (#19547)
debug_traceCall: fix state and block overrides interaction. (#18480)
eth_blobBaseFee: fix incorrect value returned. (#18506)
eth_getBalance and others: fix block-not-found error for certain historical queries. (#18457)
Block-hash canonicality check in APIs that accept a hash and state. (#19356)
eth/69: fix typed receipt encoding to use a flat RLP list as required by the spec. (#19619)
rpc: fix batch limit exceeded error to comply with JSONRPC spec. (#18260)
trace_replayTransaction(): add stack info for TLOAD opcode. (#19550)

trace_rawTransaction: execute and trace a raw signed transaction without broadcasting it. (#19524)
eth_getStorageValues: batch fetch of multiple storage slots in a single call. (#19442)
admin_addTrustedPeer / admin_removeTrustedPeer: manage trusted peers at runtime. (#19413)
Call flat tracers (trace_call family): flat trace output format support. (#18556)
engine_getBlobsV3: Engine API blob retrieval v3. (#18512)
trace_call: StateOverrides precompile support. (#18401, #18492)

Fix zombie queued transactions exceeding MaxNonceGap are now evicted. (#19449)
txnprovider/shutter: fix premature encrypted txn pool cleanup and peer drops. (#18351)
txpool: cache pendingBaseFee for queue comparisons to reduce recomputation. (#18341)

execution: add --fcu.timeout, --fcu.background.prune, --fcu.background.commit flags for fine-grained FCU timing control. (#18756)
--v5disc alias added for compatibility. (#18786)

Fusaka scheduled for Chiado (Gnosis Chain testnet) at slot 21 651 456, epoch 1 353 216, timestamp 1 773 653 580 (Mon 16 Mar 2026 09:33:00 UTC). (#19682)
Chiado bootstrap nodes updated to match the Lighthouse built-in Chiado network config. (#19693)
Balancer hard fork for Gnosis Chain mainnet. (#18122)
Amsterdam signer support and BAL non-determinism fix. (#19434)
BAL selfdestruct net-zero fix. (#19528)
Parallel execution fixes for block-access-list (BAL) workloads. (#17319)
execution/vm: EIP-8024 (SWAPN, DUPN, EXCHANGE) opcodes implemented. (#18670)

Persistent historical download — Caplin now persists and resumes historical beacon block downloads across restarts. (#18320)
Discovery v5 enabled by default — discv5 is now the default peer discovery protocol. (#18578)
cl/p2p, cl/sentinel: fix DISCV5 ENR missing IP when the discovery address is unspecified. (#19585)
Fix missing attestations by using GossipSub for subnet peer coverage. (#19523)
cl/beacon: add single_attestation event topic support. (#18142)
cl/beacon: set Eth-Consensus-Version header when versioned. (#18377)
Fix nil-ptr in DumpBeaconBlocks. (#19532)

p2p/sentry: fix wrong OR in case statement for wit protocol messages. (#19580)
p2p: better handling of RLP errors in wit. (#19569)
Fix data race in Downloader.spawn after Downloader.Close. (#18346)
discv4 disabled by default on mainnet (discv5 preferred). (#18640)

merge: prioritize Domain merge over History — 2x less disk-space required. And less impact to ChainTip by history-merge: (#19441)
merge: fix O(n²) InvertedIndex re-merge — (#19680)
SequenceBuilder: avoids an intermediate Elias-Fano representation during sequence building and merge. (#19552, #19567)
Faster startup: state-file index building deferred to reduce restart latency. (#19583, #19407)