docs: BLS12-381 migration plan#35
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5-PR plan to replace the PBC/libgmp CGo BLS implementation with BLS12-381 (blst), matching the Ethereum beacon chain signature scheme. Covers interface design, dual-key staking registration, fork-gated block verification, key migration tooling, and testnet activation timeline. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
After cross-referencing the full codebase, the original plan missed 14 files and several important concerns: - Added missing files: qc_vote_manager.go, tc_vote_manager.go, pacemaker_assist.go, reactor_assist.go, reactor_bootstrap_committee.go, key_loader.go, utils.go, cmd/mdb/main.go - TC (timeout certificate) signing path needs same fork-gate as QC - QCVoteManager/TCVoteManager hold bls.System directly; must accept BLSCommon interface instead - ComputeDoubleSigner in stats_tx.go calls bls.Verify directly and needs a fork-height branch for pre-fork evidence - comboPubKey/SplitPubKey format is implementation-specific - Delegate.BlsPubKey has a misleading JSON tag (never actually marshalled) - Keystore format change spec (bls12381_public_key, bls12381_private_key) - Pre-fork quorum check location (PrepareEnvForPacemaker) - api/node CsPubKey length change affects external consumers - candidateUpdate handler also needs BlsPubKey2 parsing Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Adds a detailed engineering plan for migrating Meter's BLS implementation from PBC (libgmp/libpbc CGo) to BLS12-381 (blst), aligning with the Ethereum beacon chain signature scheme.
Document covers
VerifyQCthat handles both old and new blocks during historical syncmeter keygen-bls12381CLI tool design (HKDF-derived from ECDSA key)PR dependency chain
PRs 1–2 are additive with no consensus risk. PRs 3–5 require validator coordination before merging to mainnet.
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