feat(sdk-core): add signRecoveryMpcV2 for EdDSA MPCv2 offline signing#9024
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lcovar
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Ticket: WCI-397 Implements local 2-party MPS signing for EdDSA MPCv2 recovery flows, mirroring the existing ECDSA signRecoveryMpcV2 pattern. The function runs the MPS DSG protocol to round 3 using user and backup key shares, then verifies the resulting 64-byte Ed25519 signature against the child public key derived via deriveUnhardenedMps. - export `signRecoveryMpcV2` from eddsaMPCv2.ts - drives `MPSUtil.executeTillRound(3, ...)` locally with user + backup DSG instances - derives the child public key via `deriveUnhardenedMps(commonKeyChain, derivationPath)` - verifies the signature with `nacl.sign.detached.verify`; throws on mismatch - add unit tests for `signRecoveryMpcV2` - valid path: 64-byte signature verifies against derived public key - tampered message: signature does not verify against a different message - wrong commonKeyChain: throws "EdDSA MPCv2 recovery signature verification failed" Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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Description
Adds
signRecoveryMpcV2tomodules/sdk-core/src/bitgo/utils/tss/eddsa/eddsaMPCv2.tsas a standalone export for EdDSA MPCv2 recovery signing flows. The function drives the MPS DSG protocol locally to completion using user and backup key shares (obtained fromgetEddsaMPCv2RecoveryKeyShares), then verifies the resulting 64-byte Ed25519 signature against the child public key derived viaderiveUnhardenedMps. Mirrors the existing ECDSAsignRecoveryMpcV2pattern.Issue Number
WCI-397
Type of change
How Has This Been Tested?
Unit tests added in
modules/sdk-core/test/unit/bitgo/utils/tss/eddsa/eddsaMPCv2.tsunderdescribe('signRecoveryMpcV2'):nacl.sign.detached.verifyagainstderiveUnhardenedMpsfalse"EdDSA MPCv2 recovery signature verification failed"Run with: