CKB Dev Log 2026-05-27

[chenyukang]

Updates

Features

CKB v0.206.0 release

• CKB v0.206.0 was released on May 6, 2026. This maintenance release focuses on dependency upgrades, security patches, rich-indexer correctness, and operator documentation.

• Release references: ckb 0.206.0 release

  Note: This release introduces no consensus or protocol changes.

Improvements & Fixes

Release maintenance and node operations

• Beyond core stability fixes, the v0.206.0 release delivered rich-indexer corrections, security dependency bumps, updated testnet bootnodes, and refreshed documentation for node operators.
• CKB also upgraded the Rust toolchain to 1.95.0 and merged smaller reliability/documentation fixes during the month.
• Links:
  • Upgrade CKB Rust toolchain to 1.95.0
  • Fix flaky ci for orphan tx
  • Split mainnet and testnet params in devnet-from-existing-data

CKB light client maintenance

• CKB light client work continued alongside CKB core maintenance. The light-client repo was updated to the Rust 1.95.0 toolchain with clippy fixes, while cargo-deny cleanup remains open.
• Links:
  • Upgrade ckb-light-client rust-toolchain to 1.95.0 and fix clippy warnings
  • Fix cargo deny checks

CKB-VM and optimized library cleanup

• CKB-VM merged additional spec/test coverage and a small API improvement for DefaultCoreMachine. ckb-vm-contrib also continued this work on optimized libraries, including B extension vectors and a new blake2b Rust binding.
• Links:
  • Add B extension spec test cases
  • Enable Clone for DefaultCoreMachine
  • Package B Extension Test Cases
  • Add blake2b rust binding

In Pipeline

RocksDB storage schema optimization

• The RocksDB key schema refactor remains CKB’s core pipeline focus. Benchmarks indicate lower read/write amplification and faster sync. The implementation is under review and testing, with the migration strategy being evaluated.
• Links:
  • Refactor RocksDB schema to reduce read and write amplification
  • Discussion: Optimize CKB Storage Schema

Guix reproducible release flow

• The reproducible build is ready for review. The PR now covers Linux, macOS, and Windows release flows to support reproducible building. It is undergoing final review before becoming part of our release process.
• Link: Guix reproducible release flow for Linux, macOS, and Windows

CKB networking with QUIC

• QUIC session support and ServiceBuilder integration are still in progress. Session support is currently open for review, while ServiceBuilder integration remains a draft. CKB-side integration will follow once these foundational work are finalized.
• Links:
  • quic QuicSession implementation
  • quic ServiceBuilder integration

Some other misc pending work

• Removing the torut dependency for onion service, Remove torut dependency #5202
• We did some memory allocator benchmarking (mimalloc vs jemalloc), Benchmark mimalloc vs jemalloc

Voting and DAO treasury research

• We continue researching a into DAO / voting system built on top of CKB-VM and zkVMs, including voting specifications, a PoC of CKB Vote System with zkVM, and experimental branches for zkVM-based voting and DAO treasury workflows. We now can conclude that zkVM is a feasible route for voting under the UTXO model, but we need more tuning to make its settlement performance better.
• Links:
  • Voting spec in ckb-vote-poc
  • ckb-vote-poc
• For the activating DAO treasury project, we will continue to consider burning issuance to avoid accumulates a massive bounty of unspent CKB, some discussions can be found here: https://talk.nervos.org/t/ndao-0000-burn-unused-treasury-funds/9626