Testnet Changelog

v0.10.2 [2025-07-30, testnet-2 only]

Notable behavioral changes:

• [Consensus] Consensus mechanism upgraded from Fast-HotStuff to MonadBFT. This is a major upgrade that adds (i) resilience to tail forking and (ii) 1-slot speculative finality
• [RPC] Add support for real-time data via websocket and shared memory queue access (docs coming soon):
  • Geth real-time events (via websocket)
  • Geth real-time events with Monad extensions (via websocket)
  • Real-time data via shared memory queue, for programs on a full node host using the execution event SDK
• [Network params] Block time reduced from 500 ms to 400 ms

Notable performance changes:

• [Execution] Switch to JIT EVM. Bytecode is now compiled to native code using LLVM for faster execution
• [Execution] Switch to using file pointer-based IPC to execute blocks. Previously, the client was using a write-ahead log (WAL), which did not take advantage of available consensus information and could result in avoidable execution.

Notable internal changes:

• [Node ops] Adds peer discovery
• [Node ops] Adds full node RaptorCast, making the full node network scalable. Full nodes may now join permissionlessly

v0.9.3 [2025-05-29]

Notable behavioral changes:

• [RPC] eth_call and eth_estimateGas limits
  • RPC providers can now set individual per-transaction limits on maximum gas for eth_call and eth_estimateGas
    • Previously the limit would always be the block gas limit (150M), now the RPC provider may choose (default: 30M)
    • Controlled with --eth-call-provider-gas-limit and --eth-estimate-gas-provider-gas-limit
  • Add a maximum timeout for queueing when executing eth_call and eth_estimateGas
    • Controlled with --eth_call_executor_queuing_timeout

Notable performance changes:

• [RPC] Improve overall eth_call performance by maintaining separate queues for cheap and expensive eth_call operations, so that cheap eth_call operations will not be queued behind expensive ones.
  • This adds two new RPC error strings:
    • failure to submit eth_call to thread pool: queue size exceeded
    • failure to execute eth_call: queuing time exceeded timeout threshold
• [RPC] Added an archive index for eth_getLogs to support queries with address and/or topic filters
  • This enables larger block ranges to be queried efficiently, with work proportional to number of matching logs instead of number of blocks in range
• [Execution] Better bounding of TrieDB traversals

Notable internal changes:

• [Node ops] Performance improvements for slow statesync client upsert
• [Node ops] Bugfix for execution delay and abrupt history length drops caused by premature soft reset
• [Node ops] keystore QOL improvements
  • Support for importing from a private key in hex string format (previously required conversion to json file)
  • More helpful documentation via --help command

testnet-1 active set expansion [2025-05-02]

Notable behavioral changes:

• none

Notable performance changes:

• none

Notable internal changes:

• [Network params] Testnet validator set expanded from 72 to 99 nodes

v0.9.2 [2025-04-05]

Notable behavioral changes:

• none

Notable performance changes:

• [RPC] Update to the eth_call execution implementation - uses fewer threads to achieve the same concurrency as in v0.9.1

Notable internal changes:

• [Node ops] Support for a faster statesync mechanism
• [RPC] RPC no longer accepts requests while node is statesyncing
• [Node ops] Some reliability and efficiency improvements to how statesync traffic is carried between nodes
• [Node ops] Bugfixes for execution crashes (monad::mpt::deserialize_node_from_buffer, 'Resource temporarily unavailable)

• [Node ops] Bug fix for unbounded blocksync requests that result in node OOM failures
• [Node ops] Removal of DNS resolution panic on start up

v0.9.1 [2025-03-24]

Notable behavioral changes:

• none

Notable performance changes:

• none

Notable internal changes:

• [Node ops] Bugfix for blocksync errors
• [Node ops] Reliability and efficiency improvements to statesync

v0.9.0 [2025-03-14]

Notable behavioral changes:

• [DevEx] Max contract size increased from 24kb to 128kb (enabled 3/14/25 19:00 GMT)
  • example 123 kb contract
• [RPC] debug_traceTransaction fixes
  • Fixed a bug where, within one transaction, only the first 100 calls were being traced
  • Added error and revertReason fields to response data

Notable performance changes:

• [Consensus] Dataplane v2 - simpler and more efficient implementation; small performance improvement in broadcast time
• [RPC] Improvements to RPC performance for eth_call

• [RPC] Removed redundant sender_recovery operation on raw transactions received via RPC

Notable internal changes:

• [Node ops] Statesync improvements to mitigate negative performance effects on upstream validator nodes

• [RPC] EIP-2 signature validation added to RPC transaction validation
• [Node ops] Miscellaneous tracing, logging and metrics additions
• [Consensus] Raptorcast performance improvement when dealing with invalid symbols

v0.8.1 [2025-02-14]

Notable behavioral changes:

• [Network params] Block time reduced from 1s to 500 ms (enabled 2/14/25 19:00 GMT)
• [Network params] Block gas limit reduced from 300M to 150M (to keep gas limit consistent) (enabled 2/14/25 19:00 GMT)
• [Fee mechanism] Transactions are charged based on gas limit, not gas consumed (enabled 2/14/25 19:00 GMT)
• [UX] UX improvements for transaction status. RPC nodes track status of transactions submitted to them in order to provide updates to users.

Notable performance changes:

• none

Notable internal changes:

• none