Release Notes - v0.49.0

v0.49.0 (May 27, 2026)

Title: Leios N2C delivery, persisted reward state, and sturdier chainsync handling

Date: May 27, 2026

Version: v0.49.0

Hi folks! Here’s what we shipped in v0.49.0.

Added use the new DingoSwap example through UTxO RPC: Operators can use a local Preview example that builds SundaeSwap orders through Dingo without relying on a separate hosted chain API. (#2390)
Introduced serve merged Leios blocks over node-to-client connections: Node-to-client consumers can now receive ranking and endorsement data together, which makes Leios-aware downstream processing easier to follow. (#2392)
Expanded keep reward state available across restarts and rollbacks: Reward tracking now survives node restarts and rollback recovery, which makes reward calculations steadier over long running operation. (#2426)
Enabled follow CIP-1694 stake-pool reward-account delegation semantics: Stake pool reward handling now follows the expected governance delegation behavior at snapshot time, which keeps pool voting outcomes aligned with reward-account intent. (#2378)

Refined keep the published release history current: The release documentation now includes the v0.48.0 entry, which keeps recent upgrade context easier to review. (#2423)
Updated refresh the DingoSwap example toolchain: The Preview example now uses a newer frontend toolchain, which keeps local evaluation and testing smoother. (#2431)

Corrected return transaction-submission rejection details in the expected format: Transaction submission clients now receive rejection details in the structure current tooling expects, which makes failed submissions easier to understand. (#2427)
Strengthened keep chainsync header tracking bounded during normal operation: Long running nodes now trim old header tracking state as sync advances, which helps chainsync stay steadier over time. (#2428)
Stabilized surface async chainsync delivery failures instead of dropping them: Chainsync now reports asynchronous send failures directly, which makes downstream connection problems easier to detect and recover. (#2419)

Clarified follow normal upgrade steps for this release: Normal upgrade steps are generally sufficient for this release.
Highlighted use the new DingoSwap example with the refreshed example toolchain: The new local Preview example runs through Dingo UTxO RPC, and the supporting frontend toolchain is now refreshed for smoother setup and testing.
Emphasized expect merged Leios ranking and endorsement delivery over node-to-client: Node-to-client consumers can now receive merged Leios data, which gives downstream tooling a more complete view through the same connection.
Summarized trust reward-state persistence and CIP-1694 reward-account delegation handling: Reward tracking now survives restarts and rollbacks, and stake pool reward-account delegation semantics now stay aligned with the expected governance snapshot behavior.
Noted expect steadier chainsync and transaction-submission reliability: Chainsync now bounds old header tracking and surfaces asynchronous send failures more clearly, while transaction submission returns rejection details in the expected format.

Thank you for trying!