Fiber Dev Log Archive: Pre-Mainnet (June 2024 - March 2025)

Before Fiber launched on mainnet, its development updates were included in a shared dev log here alongside CKB.

This archive compiles all Fiber-related updates leading up to the mainnet launch, categorized for easier reference.

🎉 Pre-Mainnet Milestones

Released Fiber v0.4.0 & mainnet deployment 2024-03-05
Added multi-hop routing support for cross-chain payments 2024-02-19
Released v0.0.1 2024-12-26
Fiber’s first version with backward compatibility 2024-12-12
Integrated Sphinx for onion message obfuscation 2024-10-16

🚀 Features

2024-03-05

Released Fiber v0.4.0 & mainnet deployment https://github.com/nervosnetwork/fiber/releases/tag/v0.4.0
Added WebSocket interfaces for Fiber nodes to subscribe to invoice/payment state changes: Persist cch state and make cch a standalone service fiber#522
Introduced Fiber Autopilot, an experimental project for continuous network analysis and peer recommendation: https://github.com/nervosnetwork/fiber-autopilot

2025-02-19

Added multi-hop routing support for cross-chain payments: https://github.com/contrun/fiber/tree/support-fiber-multiple-hops-payment-in-cross-chain-transaction
Implemented Fiber payment/invoice subscription and Cross-chain hub now uses fiber payment/invoice to drive cross-chain order updates

2025-01-22

Fiber has seen multiple updates, with the latest being v0.3.1: https://github.com/nervosnetwork/fiber/releases

2025-01-08

Default funding lock: feat: add default funding lock script fiber#442

2024-12-26

Released v0.0.1 Release v0.0.1 · nervosnetwork/fiber
Finished refactoring of the gossip message protocol: Refactor gossip protocol fiber#308

2024-12-12 The first version of Fiber Network with backward compatible is set for release by the end of this month. We’re currently testing and fixing.

Finished the audit of Fiber contract.
A fix for Musig2VerifyError issues via Rewrite channel actor state tlc operations fiber#341
Onion encryption Setup onion error packet fiber#354 for improved privacy in error handling.
Type safe onion packet feat: use type safe onion packet fiber#358

2024-11-27 No updates

2024-10-30 No updates

2024-10-16

Integrated Sphinx for onion message obfuscation: integrate sphinx for onion message obfuscation fiber#181
Fiber wallet encapsulation and external entity delegation: https://hackmd.io/@doitian/rygDvLKwCA
Added ability to specify the lock script for closing the channel when opening the channel: feat: add shutdown_script to rpc fiber#210
Added tests for Fiber node network info sync functionality: Add some unit tests for network syncing fiber#205
Implemented payment session and multi-hop HTLC error handling: Payment session and error handling on onion packet forwarding fiber#191

2024-09-29

Add payee public key for new_invoice by default fiber#160
Keysend mode added: Add keysend mode in send_payment fiber#159
Network graph RPC added: Add network graph PRC fiber#182
Onion message decryption implemented: peeling: decrypt and construct the packet for the next hop cryptape/fiber-sphinx#2
A specification of onion message released: https://github.com/cryptape/fiber-sphinx/blob/develop/docs/spec.md

2024-09-13

Onion Message encryption implementation feat: packet creation cryptape/fiber-sphinx#1
Network status synchronization in fiber nodes Add network graph, broadcasting, route path and multi-hop payment fiber#152

2024-09-04 No updates

2024-08-21

Enabled broadcasting of channel and node information for multihop payments. [WIP] Broadcast channel,node information for multihop payment fiber#144
Completed contract development based on the Daric protocol feat: refactor commitment lock to using daric protocol fiber-scripts#10
Active development on the network graph component https://github.com/nervosnetwork/fiber/tree/multihop-graph

2024-08-02

Developed version based commitment tx verification feat: version based commitment tx verification fiber-scripts#8

2024-07-22](https://github.com/nervosnetwork/ckb/discussions/4534) No updates

2024-07-11

Improved commitment fees calculation and refined shutdown logic: Add auto shutdown when shutdown tx fee is ok fiber#103

2024-06-26

Added a whitelist config for UDT allowed in current CFN (CKB Fiber Network, previously CKB Payment Channel Network) node: feat: Add UDT whitelist fiber#78

🦾 Improvements

2024-03-05

Addressed a pending offered TLC amount calculation issue in CCH: Confirmed failed tlc should not in check limit and build settlement outputs fiber#528
Fixed node restart issues during critical operations: Add ui test for send payment middle hops restarting fiber#512 Fix shutdown issues fiber#516
Added extra fields for channel RPC: Add extra fields for channel RPC fiber#514
Refactoring watchtower: Refactor watchtower fiber#524
Implementing incremental funding tx construction: feat: ensure funding tx is built incrementally fiber#517
Refactoring Funding Tracing Refactor Funding Tracing fiber#519
Updating live cells to exclude those used by ongoing funding tx Exclude live cells used by ongoing funding tx fiber#521

2025-02-19

Pre-Ready Channels Management design finished
Added multi-hop routing support for cross-chain payments: https://github.com/contrun/fiber/tree/support-fiber-multiple-hops-payment-in-cross-chain-transaction
Implemented Fiber payment/invoice subscription; Cross-chain hub now updates orders via fiber payment/invoice

2025-01-22

Design updates:
- Handle errors before channel ready fiber#437
Pathfinding improvements:
- Removed some duplicated logics: Minimize work done by build_route fiber#471
- Use private channel hop hints: Handle private channel hop hints fiber#487
- Add unit test for last hop stopped fiber#460
- Fix issue that the failure of middle hop tlc forwarding does not returned fiber#457
Message broadcast improvements:
Migration updates:
Minor fixes:

2025-01-08

Unified cryptographic signing utilities: Unify various cryptography functions fiber#420
Unit tests for gossip message processing: Add some unit tests for channel related gossip message processing fiber#418
Simplified and cleaned up code for better readability: chore: simplify fn prune_messages_to_be_saved fiber#414 chore: code cleanup fiber#417
TLC ACK operation revisited: Tlc operations wait dual ack fiber#416
Retryable forwarding TLC introduced: Add retryable forwarding tlc fiber#440
Ongoing extensive tests to ensure Fiber’s stability

2024-12-26 No updates

2024-12-12 No updates

2024-11-27

Channels are now public by default. fix: channel should be public by default fiber#331
Basic database migration has been added to the node, smoothing the updating process. Add database migration fiber#315
More robust validation of TLC while forwarding payments has been added. Add expiry check for rpc and HTLC forwarding fiber#317

2024-10-30

Added allow_self_payment for send payment: Add allow_self_payment for send_payment fiber#282
Automatic initialization for better dev experience: Initialize automatically for the first time fiber#262
Added a check to ensure the CKB amount is within the u64::max range to prevent errors when opening a channel: check CKB amount range when open channel fiber#256

2024-09-29

Improved unit test related to network syncing: Add some unit tests for network syncing fiber#205
Enhanced CI: Use random port for github action to resolve unstable CI fiber#179 Fix an possible test failure because of RepeatedConnection fiber#178

2024-09-13 No updates

2024-09-04 No updates

2024-08-21 No updates

2024-08-02 No updates

2024-07-22

Open issue: Consider the tradeoff of broadcasting channel balance: Consider the tradeoff of broadcasting channel balance fiber#138
Removed log macros and fixed log node prefix: Remove log macros and fix log node prefix fiber#127
Removed funding source lock script: Remove funding source lock script fiber#135
Prevented channel status updates when an error occurs: Do not update channel status before error fiber#131
Added limits check for Time Lock Contracts: Add limits check for tlcs fiber#140

2024-07-11

Enabled using SHA256 in Hashed Timelock Contract (HTLC) for BTC interoperability： feat: allow sha256 for HTLC fiber#105
Added the option to keep closed channels: Add option to keep closed channels fiber#124
A few improvements, including retransmission of messages that may have been lost after reconnection, enhancements to logging, and support for different hash algorithms (compatible with Lightning Network):

2024-06-26

Overhauled the internal data representation of time locked contracts (TLCs) in channel states, with a few issues fixed:
Enhanced the process for deriving secrets for each commitment transaction. Derive secrets from commitment points fiber#96
Various specification documents have been updated:
A demo for cross-chain transfer is now available for enthusiasts to try: simple cross-chain hub demo fiber#46
Optimized transaction building by only using essential cell dependencies: Find the correspending cell deps for script fiber#60

🛠️ Fixes

2024-03-05 No updates

2025-02-19

2025-01-22 No updates

2025-01-08

Fixed missing broadcast messages during a query request: Query missing broadcast messages from peers fiber#428
Cached ChannelAnnoucement timestamp to reduce round-trips with CKB: Save our own broadcast message directly and save raw gossip message from peers to memory first fiber#434
Made CI more resilient with configurable syncer count: Make number of active/passive syncers configurable fiber#429
Fixed CI failure by propagating panics: Panick the whole program when actor panick fiber#435
Adopted Molecule for deterministic hashing: fix: deterministically hash should use molecule fiber#415
Adopted Molecule for serializing relevant data structures: Use molecule for hopdata and tlc_err fiber#425
Adjusted gossip to ignore private addresses: fix: gossip actor and graph should ignore private address fiber#421
Allowed private channels as sources: fix: use private channel as source should be ok fiber#426
Properly set inbound channel actor names: fix: inbound channel actor name fiber#439
Regulated field names in RPC: [BREAKING CHANGE] fix: unify the fields name in rpc fiber#441
Cleaned up channel RPC and fixed self payment when both parties have 0 remote balance: Add custom hop hints and fix self payment fiber#432
Resolved a self payment error: fix a bug in direct channel fiber#411
Ensured the network graph updated properly when a message is received: Retry all payment session with actor message fiber#430
Updated network graph when a channel is closed: Network graph should sync up when channel closed fiber#412

2024-12-26

2024-12-12

2024-11-27

Private addresses are now filtered out by default while broadcasting NodeAnnouncement. chore: do not announce private addresses by default fiber#325
The calculation of the size of shutdown Script was corrected. fix: resolve shutdown script size bug fiber#338
An issue related to sending payments to oneself was fixed. Fix pay self issue in network graph path finding fiber#302
A bug causing incorrect fee calculation while building payment route was fixed. Fix build_router fee rate issue fiber#323

2024-10-30

Cross chain hub E2E test: fix cross chain hub e2e test fiber#275
Commitment tx capacity issue: fix: commitment tx capacity is wrong fiber#269

2024-10-16

2024-09-29

2024-09-13

Fixed issues in multi-hop payment process: Add network graph, broadcasting, route path and multi-hop payment fiber#152

2024-09-04 No updates

2024-08-21 No updates

2024-08-02 No updates

2024-07-22

Added a unit test for revoking an older commitment transaction: Test revoking old commitment tx fiber#133
Fixed handle_add_tlc_command and handle_remove_tlc_command for response: Fix handle_add_tlc_command and handle_remove_tlc_command for response fiber#134

2024-07-11 No updates

2024-06-26 Multiple bugs squashed:

Various fee and channel balance partition issues fixed. Fix channel amount and fee issues fiber#69
A problem of incompatibility in SUDT and xUDT contract that resulting in CFN contracts not working in xUDT fixed. fix: try to resolve xudt compatibility issue fiber-scripts#5
Fix inputs of transactions that consume funding cell
Fix wrong order of first second commitment point
Fix off by one error in commitment number
Fix get sent/received tlc value

⏳ In Pipeline

2024-03-05

Expand channel and router RPC capabilities
Conduct Fiber autopilot simulation and testing

2025-02-19

Status management on restart
Release mainnet version

2025-01-22

Addressing the reestablishment of Fiber channels in intermediate states following a node restart: [send_payment] return Musig2RoundFinalizeError when mid node update_channel fiber#480

2025-01-08

Fiber 1.0.0 release is in progress. Please stay tuned!

2024-12-26

Continue refactoring the gossip protocol
- Graph is not updated immediately when a TlcErrData::ChannelFailed is sent from a peer fiber#407
- Querying missing gossip messages is not very robost fiber#408
Resolving TLC operation issue caused by peer not waiting ACK from sender
Excluding used Cells during concurrent funding requests: Cells exclusion for active funding tx negotiation fiber#74

2024-12-12

A more robust gossip message protocol is coming. Refactor gossip protocol fiber#308
Exclude used Cells during concurrent funding requests: Cells exclusion for active funding tx negotiation fiber#74
Save shared secret for forwarding the onion packet, and use it to encrypt the backwarding error packets. Onion error encryption fiber#356
Limit the size of remote_commitment_points and remote_nonces Fix tlc space issue caused by remote_nonces and remote_commitment_points fiber#374

2024-11-27

Excluding used Cells during concurrent funding requests: Cells exclusion for active funding tx negotiation fiber#74
Integrating Fiber Sphnix error messages for better payment error handling Integrate fiber sphinx to return errors of payment requests fiber#198
A more robust gossip message protocol is coming. Refactor gossip protocol fiber#308
Issues occurred while adding invalid TLCs causing signature verification failures are identified and planed to be fixed. [send_payment] Call send_payment twice at the same time cause Musig2VerifyError fiber#245

2024-10-30 No updates

2024-10-16

Fiber wallet encapsulation and external entity delegation
Korean community AMA
Add more comprehensive test coverage and continue refining the codebase

2024-09-29 No updates

2024-09-13

Preparing for the second release of the Fiber testnet.
Working on Onion Message decryption and finalizing its specification.

2024-09-04

Advancing Fiber Onion Message protocol (Sphinx) research and implementation: feat: packet creation cryptape/fiber-sphinx#1
Expanding scenarios for triggering message broadcasting, and initial implementation of message processing logic required for node synchronization network status: https://github.com/contrun/fiber/commits/multihop-graph/
Active development on Fiber payment route
Completion of the node-side implementation of the Watchtower module

2024-08-21

Keep working on pathfinding
Support multi-hop cross-chain transactions
Document how to route payments
Implement Onion Message (Sphinx)
Design and implement node-side work of the watchtower module

2024-08-02

Complete the watchtower solution based on the Daric scheme
Begin working on the fiber broadcasting and pathfinding components

2024-07-22

Design and implementation of WatchTower module

2024-07-11 No updates

2024-06-26

Current channel state is removed before shutdown transaction is confirmed. A fix for that is in preparation. Channel state should only be removed when shutdown transaction has been confirmed fiber#86
More unit tests for CKB Fiber Network are planned. Add test to check that we have the correct amounts of asset for both parties fiber#92 Add an unit test to test that we can correctly revoke a commitment transaction fiber#97
Improvements for CFN funding implementation are planned. Cells exclusion for active funding tx negotiation fiber#74 Funding tx negotiation verification fiber#75
Channel re-establishment when peers are reconnected to each other is ready for review. feat: retransmission for tlc fiber#89