We are upgrading our Sei Pacific and Atlantic infrastructure to seid v6.6.3.
This is a patch release with no state-machine or consensus-breaking changes, recommended for RPC operators and validators. It includes a memory leak fix in snapshot writes, improved snapshot durability and validation, new freeze mode for historical EVM RPC, a frozen RPC router for block-scoped request fanout, and hardening fixes for nested block reference parsing and JSON-RPC batch handling. During the maintenance window, brief interruptions to RPC availability may occur.
RPC Changes: - EIP-1898 block references — Nested block reference parsing depth is now capped at 16 levels to prevent quadratic parse time and protect against adversarial inputs. - JSON-RPC batches — Router batch allocations are now bounded with write timeouts to prevent unbounded memory allocation from slow clients. - Freeze mode — Historical EVM RPC nodes can now be held at an upgrade boundary via freeze mode, continuing to serve state while staying out of mempool gossip; the frozen RPC router fans block-scoped requests to the matching frozen node.