Bitcoin minikey. Date must be NULL. Version must be NULL.
BIP32 seed XPrv. Data must contain the DN_BCHAIN_BIP32_SEED_XPRV_DATA structure. Version must be NULL.
BIP39 seed XPrv. Data must contain the DN_BCHAIN_BIP39_SEED_XPRV_DATA structure. Version must be NULL.
BIP32 XPrv. Data must be NULL. Version must be one of the key's version options.
BIP32 Ed25519 XPrv. Data must be NULL. Version must be one of the key's version options.
Types of key generation.