[Binance] Plan for user data stream migration (WebSocket API flow)

[mrbaron3]

Hi NautilusTrader team,

I'm writing to inquire about the project's plans regarding the upcoming changes to the Binance user data stream. Binance has announced the deprecation of the current listenKey-based flow, with the deadline set for 2026-02-20 UTC.

Currently, in v1.222.0, the Binance Spot adapter appears to rely on the listenKey mechanism. I couldn't find support for the new WebSocket API flow (userDataStream.subscribe / session.logon) in the codebase yet.

Could you please clarify the roadmap for this migration? Specifically:

Migration Plan: Is there an official plan to migrate the Binance Spot adapter to the new WebSocket API flow?

Timeline: If so, what is the expected version or estimated timeline for this update?

Ed25519 Support: Will the new flow support or require Ed25519 signing?

Backward Compatibility: Will there be a configuration switch to allow users to remain on the listenKey flow temporarily if needed?

Community Contribution: If no official migration is planned in the near future, where would you recommend as the best extension point for a community-driven patch?

Thank you for your guidance and for all the work on this project.