Fiber Dev Log 2026-02-06

[yuqiliu617]

Updates

Features

Trampoline routing payment (merged, upcoming release)

Fiber has added support for trampoline routing payment. The implementation is complete and merged, and will be available in the next release.

With trampoline routing:

• The sender only needs to reach the first trampoline node.
• The remaining route is encoded inside an inner trampoline onion and forwarded hop‑by‑hop by trampoline nodes.
• The final recipient only sees the final payload and settles the payment.

PR: #1012

Improvements & Fixes

Cross-Chain Hub (CCH) Order Refactoring

• Introduced CCH order refactoring with Finite State Machine (FSM) and persistence: Refactor CCH order with FSM and actions #971
• Refactored CCH order with FSM and actions: feat(cch): implement order persistence and housekeeping #1045
• Added expiry, preimage, and invoice validations: feat(cch): add expiry, preimage, and invoice validations #998

Path-Finding Performance Improvements

• 10x faster with map indexing: The bottleneck was identified in get_node_inbounds where Pubkey equality checks called expensive secp256k1_ec_pubkey_serialize operations internally. Since path-finding iterates through many channels with multiple equality checks, performance was dominated by cryptographic serialization rather than actual graph logic. The fix replaces sequential iteration with map indexing, eliminating the costly PartialEq operations during path discovery:
  • Improve find_path performance with map #1081
• 2x faster with serialized pubkey storage: Stores already-serialized compressed public keys ([u8; 33]) within ChannelInfo to permanently remove serialization overhead:
  • Use new Pubkey for better performance #1084

Optional Gossip Network for Reduced Resource Usage

This allows nodes to disable the gossip network by making the GossipActor optional. When disabled, the node no longer participates in gossip avoids registering the gossip protocol, and skips gossip-related store updates. This reduces network bandwidth and CPU usage for nodes that don't need full gossip participation.

• PR: feat: add option to disable gossip network synchronization #1070

Fiber Dashboard

• Capacity/Assets Data Separation: The concepts and data of capacity and assets are now separated at the API level, allowing users to view metrics in different assets (CKB/UDT)
  • feat: capacity/state count by asset cryptape/fiber-dashboard#56
  • feat: asset and capacity cryptape/fiber-dashboard#57
• CKB unit display:
  • feat: capacity/state count by asset cryptape/fiber-dashboard#56
  • feat: asset and capacity cryptape/fiber-dashboard#57
  • feat: ckb capacity unit change cryptape/fiber-dashboard#58
• Upgraded salvo to resolve the list parsing issue in query params.
  • chore: upgrade salvo cryptape/fiber-dashboard#60

Developer Tooling

• Fiber Demo Startup: Dockerfiles for CKB and Fiber nodes that can startup and pass health checks, making it easier to spin up local development environments: https://github.com/officeyutong/fiber-demo-startup

Fixes

• Return failure when sending tx returns a permanent error: Stop CKB tx tracer when fail to resolve #1069
• Multiple one-way channel bugs:
  • Oneway channel and trampoline routing #1012
  • Add a up bound limit for payment fee #1073
  • Fix unstable watchtower test case #1074
  • Fix unstable add_tlc ci test #1085

In Pipeline

Protocol Debugging

• Debugging protocol error with simultaneous SC + retry TLCs: Reproduce channel bug #1047

TLC On-Chain Settlement

• Design discussion on hold TLC settlement logic to improve payment handling according to feedback: refactor: improve hold TLC settlement logic #1022
• Implementation Solution 1: Update Payment Status After On-Chain Settlement #1077

External wallet signing for channel funding

This allows users sign funding transactions with their own wallets instead of the node's key, via new RPC endpoints for requesting and submitting unsigned transactions. It adds a channel state for awaiting external signatures and reuses existing timeouts, giving users greater control and security over channel funds.

• PR: feat: add external wallet signing for channel funding #1083

Avoid performance issues when restarting for a lot of pending payments

This prevents the NetworkActor from being blocked during channel reconnection by eliminating a full scan over all payment attempts, avoiding multi-minute stalls on large databases and preventing payment timeouts with panics: #1093

Upcoming release preparation

• Preparing 0.7.0 release, including one-way channel and trampoline routing
• Migration required

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