KIP-227: Revision

[ian0371]

Proposed changes

This PR updates KIP-227 with a more concrete VRank specification: new data structures, protocol behavior, and clearer scoring.

[Terminology]

• CANDIDATE_READY_TIMEOUT → CANDIDATE_MSG_TIMEOUT (200ms → 500ms)
• CandidateReady → VRankCandidate
• crReport → cfReport (Candidate Failure Report)
• TMFS / CMFS → CFS (Candidate Failure Score)
• PFS_FAILURE_THRESHOLD → PFS_THRESHOLD = 2
• CFS_THRESHOLD = 300
• Messages: VRankPreprepare, VRankCandidate (including signature scheme)

[Parameters]

• Removed: BLOCK_TIME, DOWNTIME_THRESHOLD, CONSECUTIVE_FAILURE_LENGTH_10_CF, CONSECUTIVE_FAILURE_LENGTH_15_CF
• Added: CFS_THRESHOLD = 300
• Updated: PFS_THRESHOLD = 2, CANDIDATE_MSG_TIMEOUT = 500ms
  • The longer timeout (500ms) is intended to better support geographically distributed validators.

[Removed]

• CMFS and consecutive failure logic

Types of changes

• Bugfix
• KIP Proposal
• KIP Improvement

Checklist

• Used the suggested template: https://github.com/kaiachain/KIPs/blob/main/kip-template.md
• I have read the CLA and signed by comment I have read the CLA Document and I hereby sign the CLA in first time contribution
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

#27