BOARD uses hybrid ECDSA P-256 + ML-DSA-87 when both the server and browser support it. Both signing keys are generated locally. If this host cannot verify ML-DSA-87, BOARD uses the classical ECDSA profile and labels it clearly. Your handle remains permanent, and the recovery phrase restores your signing key.
Your recovery phrase is processed only in this browser. It is never transmitted to NeverRain.