feat(sdk-lib-mpc): add deriveUnhardenedMps for EdDSA MPCv2#8766
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feat(sdk-lib-mpc): add deriveUnhardenedMps for EdDSA MPCv2#8766Marzooqa wants to merge 1 commit into
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Implements the Silence Labs BIP32-Ed25519 non-hardened derivation formula (HMAC-SHA512 with big-endian index, no prefix byte) as a TypeScript function in sdk-lib-mpc. This produces the same derived public key that the WASM DSG uses internally, unblocking EdDSA MPCv2 wallet address derivation. Includes cross-check tests that verify DSG signatures at m, m/0, and m/0/1 verify against the derived public keys, confirming formula correctness. TODO(WCI-390): replace with wasm-mps ed25519_derive_public_key once exposed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Implements the Silence Labs BIP32-Ed25519 non-hardened derivation formula (HMAC-SHA512 with big-endian index, no prefix byte) as a TypeScript function in sdk-lib-mpc. This produces the same derived public key that the WASM DSG uses internally, unblocking EdDSA MPCv2 wallet address derivation.
Includes cross-check tests that verify DSG signatures at m, m/0, and m/0/1 verify against the derived public keys, confirming formula correctness.