[Standard] Fluent Mainnet and Testnet - v1.4.0

Scheduled for Aug 26, 01:00 - 05:00 UTC

Scheduled

We are upgrading our Mainnet and Testnet infrastructure to v1.4.0 (MITHRIDATE).

This release adds Solidity contract support to the runtime-upgrade system and includes critical security and correctness fixes, including linear memory bounds across nested contract frames, runtime-upgrade artifact authentication, and EVM bytecode preservation.

During the maintenance window, brief interruptions to RPC availability may occur.

RPC Changes:
- eth_call / eth_estimateGas / eth_sendRawTransaction — gas charged for the P256 (EIP-7951) signature verification precompile has been corrected. Users invoking this precompile (e.g. for secp256r1-based account verification) will see updated gas costs.
- Blob-related opcodes (BLOBHASH, BLOBBASEFEE) now consistently return zero when queried via eth_call, since Fluent does not process blob transactions.

https://github.com/fluentlabs-xyz/fluentbase/releases/tag/v1.4.0

Posted Aug 19, 2026 - 13:29 UTC

This scheduled maintenance affects: Fluent (Fluent Testnet - Websockets API, Fluent Testnet - JSON RPC API, Fluent Mainnet - Websockets API, Fluent Mainnet- JSON RPC API).