Fiber Dev Log 2025-04-17

Updates

Fiber v0.5.0 Released

Including breaking changes to both contract behavior and configuration files.

View the release note for more details: https://github.com/nervosnetwork/fiber/releases/tag/v0.5.0

Performance & Build

Resolved performance regression: https://github.com/nervosnetwork/fiber/pull/661
Fixed compiling issue caused by build.rs: https://github.com/nervosnetwork/fiber/pull/651

Watchtower Improvements

Watchtower now loops through all live cells to prevent transaction pinning attacks.
- Extracted preimage discovery into a dedicated find_preimages function: https://github.com/nervosnetwork/fiber/pull/644
Watchtower now claims upstream HTLCs using on-chain preimages: https://github.com/nervosnetwork/fiber/pull/640

Channel Handling

Force-close channel when HTLCs expire without response: https://github.com/nervosnetwork/fiber/pull/623
Forbid abandoning signed funding channels to prevent risk from peers committing signed funding transactions later: ****https://github.com/nervosnetwork/fiber/pull/633
Fixed invoice cancel bug caused by check channels job in edge cases: https://github.com/nervosnetwork/fiber/pull/657
Added test for retrying remove HLC and preimages cleanup: ****https://github.com/nervosnetwork/fiber/pull/647

Fixing channel closure issue

Addresses the problem where channels get stuck in the AWAITING_CHANNEL_READY state: https://github.com/nervosnetwork/fiber/issues/606
Refactoring the Watchtower into a standalone service with WASM support
Implementing database support to Fiber WASM.