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zeekay
567f950fa0
BLS is consensus-only. The mpcd validator-key custody path generated a
threshold-BLS group key via a TRUSTED DEALER (blsThreshold.TrustedDealer:
one node, the lowest sorted party ID, generated the entire group secret
key and all shares, then distributed them) — a single point of full-key
compromise, with no DKG and no rogue-key PoP. That violates the
public/leaderless/permissionless invariant "no single node can sign or
extract a key".
Orphan-safe: this path was incomplete (no proof/sign-off doc unlike
cmp/frost; no deployment manifest provisions validator-BLS; BLS keygen
had no dispatch caller) and NOT live custody. A validator's real BLS
consensus key is its own NATIVE per-validator crypto/bls key (PoP +
aggregation, the consensus fast-path), held at the node — never
threshold-custodied here. Corona PQ-threshold custody (dealerless DKG)
stays. So a validator keyset = {native BLS (consensus, no custody) +
corona PQ-threshold (custodied)}.
Delete: bls_keygen_session.go, bls_signing_session.go, bls_config_marshal.go,
bls_session_test.go, signing_handler_bls.go. Remove KeyTypeBLS (mpc + types),
SessionTypeBLS, CreateBLS{KeyGen,Sign}Session, the BLS signing/keytype
dispatch cases, the keygen-result BLSPubKey field, and the bls: key-share
prefix. handlers_kms.go: drop the BLS-custody half of ValidatorKeySet and
the generate/sign/rotate BLS branches; KMS custodies corona only.
Verified: GOWORK=off go build ./... + go vet green; pkg/mpc, pkg/api,
pkg/types tests pass. Zero residual refs to deleted BLS symbols.